HomeMy WebLinkAboutSWPP Rec'd 2/27/24 56655 ROUTE 25
SOUTHOLD 1 OF S
SUFFOLK
STORMWATER POLLUTION
PREVENTION PLAN
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SS1ONP
PREPARED FOR:
The Enclaves
56655 Route 25
Southold,New York 11971
PREPARED BY:
P.W.Grosser Consulting Engineer&Hydrogeologist,PC
630 Johnson Ave., Suite 7
Bohemia,NY 11716
Phone: 631-589-6353
PWGC Project Number: AVG1803
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SWPPP CERTIFICATION
I hereby certify that the Stormwater Pollution Prevention Plan(SWPPP)for this project has
been prepared in accordance with the terms and conditions of the GP-O-20-001.
Furthermore, I understand that certifying false, incorrect or inaccurate information is a
violation of this permit and the laws of the State of New York and could subject me to
criminal, civil, and/or administrative proceedings.
09/06/2023
Bryan Grogan, P.E. Date
Sr.Vice President
P.W. Grosser Consulting Engineer&Hydrogeologist, PC
63o Johnson Ave., Suite 7
Bohemia, NY 11716
Work: (631) 589-6353
Fax: (631) 589-8705
bgrogan@pwgrosser.com
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STORMWATER POLLUTION PREVENTION PLAN
THE ENCLAVES
SOUTHOLD,TOWN OF SOUTHOLD, NEW YORK
TABLE OF CONTENTS PAGE
SWPPPCERTIFICATION............................................................................................................I
1.0 INTRODUCTION..............................................................................................................i
I.I. Project Description .....................................................................................................1
1.2. Site Description ......................................................................................................... 2
1.3. Soils............................................................................................................................. 2
1.4. Groundwater............................................................................................................... 2
1.5. Project Permitting and Compliance.......................................................................... 2
1.5.1. State Pollution Discharge Elimination System General (SPDES)Permit.................2
1.5.2. Municipal Separate Stormwater Sewer System Permit..............................................3
2.0 CONSTRUCTION SEQUENCE AND SCHEDULING......................................................... 3
3.0 EROSION AND SEDIMENT CONTROL...........................................................................4
3.1. Identification and Control of Potential Stormwater Pollutants............................. 5
3.1.1. Significant Material Inventory.......................................................................................5
3.1.2. Potential Sources for Stormwater Pollution.................................................................5........................5
3.2. Erosion Control and Sediment Controls ..................................................................6
3.2.1. Site Planning and Prevention Measures.......................................................................6
3.2.2. Stabilized Construction Entrance...................................................................................7
3.2.3. Perimeter Sediment Controls..........................................................................................7
3.2.4. Drop Inlet Protection........................................................................................................7
3.2.5. Dust Control...................................................................................................................... 8
3.2.6. Vehicle Maintenance and Material Storage Areas...................................................... 8
3.2.7. Good Housekeeping Practices........................................................................................ 8
3.2.8. Temporary Seeding......................................................................................................... 9
3.2.9. Topsoiling......................................................................................................................... 9
3.2.10. Surface Roughening.......................................................................................................10
3.2.11. Permanent Seeding........................................................................................................10
3.3• Inspection and Maintenance of Erosion and Sediment Controls .........................io
3.3.1. Inspection and Contractor Notification Requirements.............................................10
3.3.2. Inspections During Shutdown....................................................................................... 11
3.3.3. Maintenance.................................................................................................................... 11
3.3.4• Contractor Compliance Certification...........................................................................12
1 ' . . . 11 Willi .,..
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3.3.5. Training Requirements..................................................................................................12
3.4. Pollution Prevention.................................................................................................13
3.4.1. Spill Prevention Plan......................................................................................................13
3.4.2. Spill Response Plan.........................................................................................................14
3.5. Recordkeeping...........................................................................................................16
3.5.1. Weekly Inspections Reports...........................................................................................16
3.5.2. Records Retention...........................................................................................................17
3.5.3. SWPPP Amendments......................................................................................................17
3.6. Final Stabilization and Cleanup...............................................................................17
4.0 POST-CONSTRUCTION STORMWATER MANAGEMENT...........................................18
4.1. Water Quality Volume Calculations.........................................................................18
4.2. Water Quantity Volume Calculations.......................................................................19
4.2.1. Pre-Development Conditions Analysis.......................................................................19
4.2.2. Post-Development Conditions Analysis.....................................................................20
4.3• Post-Construction Maintenance.............................................................................21
5.0 CERTIFICATIONS......................................................................................................... 22
5.1. Preparers Certifications........................................................................................... 22
5.2. Contractors&Subcontractors Compliance Certifications.................................... 23
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TABLES
Table 3-1 Potential Construction Site Stormwater Pollutants
Table 3-2 Locations of Potential Sources of Stormwater Pollution
Table 4-1 Post-Developed Drainage Conditions Water Quality Volume
and Storage Summary
Table 4-2 Site Precipitation Data
Table 4-3 Pre-Developed Drainage Conditions Summary
Table 4-4 Post-Developed Drainage Conditions Summary
APPENDICES
Appendix A United States Department of Agriculture(USDA) Soils Report
Appendix B United States Department Of Agriculture Long Island Depth to
Water Viewer Report
Appendix C Construction Duration Inspection Checklist
Appendix D Leaching Pool Inspection Checklist
Appendix E Notice of Intent
Appendix F Water Quality Volume Calculations
Appendix G Water Quantity Volume Calculations
Appendix H MS4 Acceptance Form
Appendix I Proposed Site Plans(Construction Drawings)
Appendix j New York State Department of Environmental Conservation SPDES General
Permit for Stormwater Discharges from Construction Activity (Permit No.
GP-0-20-001)
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1.0 INTRODUCTION
This Stormwater Pollution Prevention Plan(SWPPP)has been prepared on behalf of
The Enclaves (Owner) to support the proposed construction activities (Work) at 56655
Route 25, Southold, NY 11971 (Site). For detailed information regarding the design and
planned construction activities,refer to the "Site Plans" (Construction Drawings)prepared
by P.W. Grosser Consulting Engineer and Hydrogeologist, P.C. (Engineer) included as
Appendix I.
This SWPPP fulfills the requirements of the Town of Southold and the New York State
Department of Environmental Conservation (NYSDEC) SPDES (State Pollutant Discharge
Elimination System)General Permit for Storm Water Discharges from Construction Activity
(Permit No.GP-0-20-oo1).The SWPPP objectives for the Site are to:
• Minimize the potential for erosion and conveyance of soil/sediment via surface
runoff to downgradient on-site areas outside the limits of work, and downgradient
off-site areas.
• Minimize the potential for erosion and sediment migration within the work areas.
• Minimize the potential for erosion and migration of soil/sediment via surface runoff
such that water quality in downgradient water bodies is not significantly affected
relative to pre-construction conditions.
• Minimize the potential for mechanical tracking of soils/sediments onto off-site
areas.
• Identify potential stormwater pollutants and their sources; eliminate, control, or
otherwise manage each potential pollutant or its source using appropriate Best
Management Practices (BMPs).
This SWPPP has been prepared in accordance with the latest requirements of the New York
State Standards and Specifications for Erosion and Sediment Control and New York State
Stormwater Management Design Manual.
1.1. Project Description
The proposed of this project is to renovate and convert an existing two-story dwelling
to a 68-seats and 6 bar-seats restaurant, build a two-story hotel with (44) forty-four
units with 36-seats hotel cafeteria/continental breakfast,a one-story event space with
100 seats, and a pool area, play court and chess board, as well an on-site sewage
treatment plant located at the northeast corner of the site in the Town of Southold, New
York.
Development activities for this project will consist of the construction of 44 hotel units
and 1 event room in the same building, renovation of 74 seats in an existing dwelling,
and construction of an onsite 9,570 gallon per day(GPD) sewage treatment plant, and
associated site drainage paving and utilities.
The site work will consist of the installation of the required drainage structures;curbing
of the proposed roads; installation of utility lines (sewer, water and electricity);
installation of site lighting; and paving of the proposed roads.All improvements are to
conform to state, county and local standards and specifications.
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1.2. Site Description
The Site is an existing 6.75-acre property that is a mix of wooded and grassed area with
an existing gravel driveway, an existing 2-story frame residence with a 1-story garage
structures, sheds and slates. The existing site contains 6,437 ft2 of impervious area or
2.19 percent of the total property.Access to the site is proposed via the existing gravel
driveway location with widen width on Route 25.
The surrounding land use adjacent to the site is mixed residential and commercial
properties, with both residential and commercial properties to the East of the Site and
commercial properties to the West of the Site. Depot Road borders the site to the Sough
and is lined with both residential and commercial properties,while Long Island Railroad
borders the property to the North.
Stormwater runoff generated within the project Site limits occurs primarily as sheet
flow. The runoff generally flows from North to the. Slopes within the Site limits are
approximately O-2% on average. Flow then concentrates along the roadway edges and
is assumed to drain into existing catch basins along the adjacent roadways or infiltrate
in localized low-lying areas. There is no evidence of significant erosion under existing
site conditions.
The developed site will consist of a mix of impervious and pervious areas.Pervious areas
should be vegetated at the completion of construction. The proposed redevelopment
will increase the impervious area of the site to 127,816 ft2 or 43.4%of the total property.
Based on online obtained data from the U.S. Fish &Wildlife Service National Wetlands
Inventory, there are no existing wetland features within the Site limits.
1.3. Soils
Soils within the Site limits are classified as "Haven loam (HaA), 0 to 2 percent slopes"
and Hydrologic Soil Group B.Soil type(s)were identified based on information available
from the United States Department of Agriculture's Web Soil Survey(Appendix A).
1.4. Groundwater
The depth to groundwater was determined by utilizing the USGS "Long Island Depth to
Water Viewer" website (http://ny.water.usgs.gov/maps/li-dtwlo/), which uses
groundwater data that was compiled from 2019 to estimate depth to groundwater. The
viewer indicated that the depth to groundwater on site ranges between 23 and 29 feet
from surface grade.Refer to map included as Appendix B.
1.5. Project Permitting and Compliance
1.5.1. State Pollution Discharge Elimination System General (SPDES)Permit
This SWPPP has been prepared in accordance with the substantive requirements of
the GP-O-20-001 (Appendix J).Activities included in this SWPPP require coverage
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under the GP-0-20-ool as this project will disturb more than one acre.A Notice of
Intent(NOI)form will be submitted to the NYSDEC for this project(Appendix E).The
NOI will include SWPPP Preparer and project Owner/Operator certification forms.
1.5.2. Municipal Separate Stormwater Sewer System Permit
The Site lies within the Town of Southold Municipal Separate Stormwater Sewer
System(MS4).The SWPPP and NOI (Appendix E)will be submitted to the Village of
Westhampton Beach for review and approval.Once the Town of Southold accepts the
SWPPP and returns a signed MS4 acceptance form (Appendix H), the MS4
acceptance form will be submitted along with the NOI to the NYSDEC.
2.0 CONSTRUCTION SEQUENCE AND SCHEDULING
A schedule for activities before, during and after is presented below. Included is the
sequence of implementing the Erosion and Sediment Control Plan.
The construction sequence described below is expected to start in 2024.
1. Demolition of existing pavements, concrete pads, trees and landscaped areas.
2. Pre-Construction SWPPP measures, site entrance, silt fence, tree protection
3. Berm construction and site grading
4. Temporary staff parking area
5. Utilities and road drainage
6. Hotel foundations excavation, sewage collection system, drainage, utilities, etc
7. Sewage Treatment plant, control building, and associated equipment's, pipping,
utilities, drainage, generator, etc
8. Hotel construction
9. Swimming area construction
10. Restaurant conversion and renovation
11. Driveway,walkway, and parking area constructions
12. Finish Site work and final landscaping
2.1. Pre-Demolition Actions
The Erosion&Sediment Control (ESC) measures listed below shall be installed prior to
the commencement of construction activities. Stabilization measures shall be
implemented throughout demolition and site activities.All pre-demolition actions will
be inspected and maintained throughout the duration of construction activities, as
necessary.
• Silt Fencing
o Installed around the perimeter of the property prior to commencement of
any construction related work on the site.
o Removed when vegetative areas have been established to 8o percent growth,
paved areas and hardscaping have been completed.
• Stabilized Construction Entrances
o Installed once site boundary protection has been installed
o Removed as work reaches completion
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• Tree Protection
o Installed around trees once site boundary protection has been installed
o Remove as work reaches completion
2.2.During Demolition and Redevelopment
The Erosion & Sediment Control (ESC) measures listed below shall be installed during
site activities at the site as necessary.
• Erosion Control(stabilization)
o Stabilization measures shall be implemented throughout the duration of the
site activities as needed
• Dust Control
o Dust Control measures shall be implemented throughout the duration of the
work as needed.
• Inspection, maintenance and plan amendments for ESC measures shall be
performed as necessary throughout demolition and site activities.
• Final stabilization, grading and repair shall be performed at the close of the
proposed site and demolition activities at each site.
2.3.Final Stabilization and Cleanup
After construction is complete the disturbed areas not containing pavement, riprap,
cobble, etc.,will be permanently stabilized.Once construction activities are complete in
an area, it shall be stabilized with permanent seed and mulch within seven(7)days. Soil
stabilization involves covering disturbed soils with grass,bark,mulch, straw,or hydro-
seed as specified in section 3.2.8 to 3.2.12 of the SWPPP.
The temporary control measures other than perimeter controls will be removed during
finish grading. The temporary perimeter controls(silt fence)will not be removed until
all construction activities at the site are complete and soils have been stabilized.
2.4.Post-Construction Maintenance
The estimated maintenance schedule for the post-construction stormwater
management practices is summarized below.
Catch Basins — Inspected monthly and pumped out and emptied when sediment and
debris accumulation exceeds 1o%of the structure's depth.
3.0 EROSION AND SEDIMENT CONTROL
The purpose of this subsection is to identify and address pollutants that could impact
stormwater during construction activities.The Contractor will be responsible for installing
and maintaining all temporary erosion and sediment control measures required during
project construction activities. All erosion and sediment controls will be installed and
maintained in accordance with the latest edition of the NYS Standards and Specifications
for Erosion and Sediment Control (NYS Standards and Specifications). Erosion and
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sediment controls specific to this project are provided in the Construction Drawings
(Appendix I).
Temporary erosion and sediment control measures will be installed prior to initiation of soil
disturbing activities. The Contractor will also be responsible for providing additional
erosion and sediment control measures, as needed, or as directed, to achieve the
stormwater management objectives of this SWPPP and maintain compliance with this
SWPPP.
3.1. Identification and Control of Potential Stormwater Pollutants
3.1.1.Significant Material Inventory
Pollutants that result from the redevelopment of the site that have the potential to
be present in stormwater runoff are listed in Table 3-1. This table includes
information regarding material type, chemical and physical description, and the
specific regulated stormwater pollutants associated with each material.
Table 3-1 Potential Site Stormwater Pollutants
Trade • Description
Wastewater from demolition Water Soil oil& solids
equipment grease'
Hydraulic oil/fluids Brown oily petroleum Mineral oil
y hydrocarbon
Gasoline Colorless,pale brown or pink Benzene,ethylbenzene,
petroleum hydrocarbon toluene,xylenes
Diesel Fuel Clear,blue-green to yellow liquid Petroleum distillate,oil&
g y q grease,naphthalene,xylenes
Kerosene Pale yellow liquid petroleum Coal oil,petroleum distillates
Hydrocarbon
Ethylene glycol,propylene
Antifreeze/coolant Clear green/yellow liquid glycol,heavy metals(copper,
lead,zinc)
LE Solid particles Soil, sediment
3.1.2. Potential Sources for Stormwater Pollution
The following potential source areas of stormwater pollution were identified and
evaluated:
• Construction Site Entrance
• Drive Area Construction
• Construction Equipment
• Construction Material and Equipment Staging Areas
• Waste Material Staging Areas
• Topsoil and Fill Material Staging Areas
• Clearing And Grading Areas
• Concrete Demolition
• Concrete Washout Areas
FIR
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• Utility And Sanitary System Installation
Table 3-2 presents site-specific information regarding the stormwater pollution
potential from each of these areas.
Table 3-2
Locations of Potential Sources of Stormwater Pollution
Potential
Water -ntial Pollutants Potential Problem
Po Point
Leaking hydraulic oil and antifreeze
from clearing and grading
Construction Site Entrances,Drive equipment.Gasoline and diesel fuel
Areas,Construction Material and Asphalt,hydraulic oil, spills while fueling equipment,and
gasoline,antifreeze,soil p g
Equipment Staging Areas,and erosion of exposed and stockpiled
Waste Material Staging Areas. erosion
g g soils. Tracking of soil into the road
through the construction site
entrance(s).
Soil erosion,SVOCs,
ClearingAnd Grading Areas metals,Landscaping Erosion of soils from clearing and
g materials(e.g.,mulch, grading areas have the potential to
Topsoil and Fill Material Storage Areas fertilizer'pesticides and discharge into local surface water
PCBs),Vegetative debris bodies.
from clearing operations
Accidental leaking of hydraulic oil
Concrete-dust,concrete, and antifreeze from demolition
Concrete Demolition and Concrete hydraulic oil,gasoline, equipment,gasoline and diesel fuel
Washout Areas antifreeze,soil erosion, spills while fueling demolition
kerosene equipment,erosion of exposed and
stockpiled soils.
Erosion of soils from excavation and
Utility/Sanitary Installation Soil erosion grading areas have the potential to
be discharged from the site.
3.2.Erosion Control and Sediment Controls
The purpose of this subsection is to identify the types of temporary erosion and
sediment controls that will be used during site activities. Each of the practices listed
below are located on Sheet C-300 of the Construction Drawings and detailed on Sheet
C-301 of the Construction Drawings(Appendix I).
3.2.1. Site Planning and Prevention Measures
This project will implement the following site planning and prevention measures for
effective temporary and final erosion control during construction:
• The Contractor and Owner will work together to properly plan and sequence
construction events in an effort to minimize the time that soil and stockpiled
materials are exposed.
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• Temporary stockpiles of soil will be located in upland areas where stockpiles
are protected from significant runoff. Additional stormwater perimeter
controls may be required at downgradient locations.
• Restore the surface (i.e., achieve the design grade and establish the
vegetative cover or gravel) as soon as possible.
• The Contractor and Owner will evaluate site conditions prior to site clearing
to determine if existing vegetation can be preserved or transplanted to the
extent practical.
3.2.2. Stabilized Construction Entrance
A stabilized construction entrance (SCE) will be installed at the proposed site
ingress/egress along Route 25 at the location indicated on Sheet C-300 of the
Construction Drawings (Appendix I).
SCE's shall be constructed with a 6-inch minimum layer of stone as indicated on the
detail provided on Sheet C-301 of the Construction Drawings (Appendix I). The
length of the SCE should be a minimum Of 50 feet. The exact locations and lengths
of the SCE's shall be determined by the Contractor and Owner's on-site
Representative on a case by case basis. The stabilized entrance shall capture mud
and debris from vehicles before entering public roads to minimize the tracking of
sediments off the property and will assist in controlling dust on the site. The
contractor will be responsible for placing additional stone on the SCE's as site
activities progresses as necessary to maintain effectiveness.
SCE's shall be positioned such that any stormwater runoff that exits the sites shall
flow through the SCE to allow for the SCE to assist in filtering out sediment from the
stormwater runoff.Additional SCE's shall be installed as necessary at the work site
if additional entrances are required as part of the proposed Work. SCE's are to
remain in place for the duration of the Work and will only be removed upon
completion of applicable Phasing of the Work.
3.2.3. Perimeter Sediment Controls
Silt fencing with wire mesh backing will be used to reduce the potential migration of
suspended sediments from work areas to downgradient off-site areas.Silt fence will
be installed along the limits of disturbance as well as on the vulnerable side of soil
stockpiles (where applicable) and extend approximately 20% around the
perimeters. The locations of the silt fence are as shown on Sheet C-300 of the
Construction Drawings (Appendix I) and will be positioned parallel to the existing
contours to the extent practical.Silt fence may also be installed around construction
material and equipment staging areas, and as otherwise needed to control potential
off-site migration of suspended sediments in sheet flow.
3.2.4. Drop Inlet Protection
Upon completion of the on-site drainage system components, curb drop inlet
protection and/or filter fabric drop inlet protection will be installed over the grates
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of the drainage leaching pools and manhole for the duration of the construction
activities. Locations of drop inlet protection are shown on Sheet C-300 of the
Construction Drawings and detailed on Sheet C-301 of the Construction Drawings
(Appendix I).
3.2.5. Dust Control
Dust (particulate matter) control measures shall be implemented throughout the
duration of the construction activities.
The following dust control measures shall be implemented in driving areas:
• Limit on-site vehicle speed limits.
• Sweeping of roadways and other hard surfaces.
• Spray water from a domestic water supply on dry material being loaded on
trucks that might release dust. Water for dust suppression shall be applied
such that runoff does not occur and excessive "water weight" is not added to
the soil.
• Cover trucks carrying loose material such as debris generated by site
activities, excavated soil or fill and verify that the covers are properly sealed.
The following dust control measures shall be implemented at soil stockpiles and
demolition debris stockpiles in non-driving areas:
• Spray water from a domestic water supply on stockpiles with appropriate
distribution equipment that shall be kept on-site throughout the duration of
the site activities. Water for dust suppression shall be applied such that
runoff does not occur and excessive "water weight" is not added to the soil.
• Cover stockpiles with plastic sheeting and verify that the covers are properly
weighed down.
3.2.6. Vehicle Maintenance and Material Storage Areas
The Contractor will perform vehicle/equipment maintenance activities and will
store construction materials (such as fuels, fertilizers, construction materials) in a
designated area to prevent a potential release to stormwater. Vehicles shall be
maintained for excess sediment accumulation and washed in designated areas that
limit the release of sediment laden runoff.Additional erosion and sediment control
measures will be installed, as needed, prior to vehicle washing to reduce the
potential for erosion of downgradient areas and minimize sediment migration.
Construction materials(such as tools,building supplies, fertilizers, grass seed) and
any fuel or fluids that could adversely impact stormwater must be properly covered,
contained, or placed in a temporary shed or enclosure.
3.2.7. Good Housekeeping Practices
Good housekeeping and spill control practices will be followed during site activities
to minimize stormwater contamination from concrete,petroleum products and waste
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materials. Good housekeeping and spill control practices include the following:
• Materials and equipment necessary for spill cleanup shall be maintained
onsite in the equipment and waste material storage area,covered and secured.
Equipment will include,but is not limited to,brooms, dust pans, mops, rags,
gloves, goggles, plastic trash containers and trash liners.
• On-site vehicles shall be monitored for leaks and will receive regular
preventive maintenance to reduce the possibility of leakage.
• Petroleum products shall be stored in tightly sealed containers which are
clearly labeled.
• Spill kits shall be included with all fueling sources and maintenance activities.
• Spills shall be cleaned up immediately upon discovery. Spills large enough to
reach the surface waters will be reported to the National Response Center at 1-
800-424-8802.
• Dump trucks hauling material from the site shall be covered with a tarpaulin.
• Paved streets adjacent to the site entrances shall be swept as needed to remove
excess mud, dirt, or rock tracked from the site.
• Ruts caused by equipment used for clearing and grubbing shall be regraded.
• Waste materials shall be collected and stored in securely covered metal
dumpsters rented from a licensed solid waste management company. Trash
and debris from the site will be deposited in the dumpsters. The dumpsters
will be emptied at least weekly or when full, whichever occurs first and the
trash will be hauled to a solid waste landfill. The dumpsters will be located
near the construction entrance. Materials generated by site activities will not
be buried on-site.
3.2.8. Temporary Seeding
Temporary seeding of select areas may be implemented to reduce the potential for
erosion and sediment transport from disturbed areas, bare soil areas, or soil
stockpile areas.This seeding will be applied to provide a temporary protective cover
on disturbed areas when construction activities have temporarily ceased, such as
when preparing for winter shutdown, or to provide cover when permanent seed
growth is delayed due to mid-summer heat or drought. If bare soil will be exposed
for more than 14 days, temporary seeding or other controls will be utilized to the
extent practicable and will be initiated by the end of the next workday. Note that
seeding should be performed promptly after completing the grading activities to
minimize the need for surface roughening. Areas to be seeded will be scarified as
needed prior to seeding.Temporary seed mix shall be Ryegrass(annual or perennial)
applied at 30 lbs per acres (0-7 lbs per 1,000 sq.ft.), or certified "Aroostook" Winter
Rye (cereal rye) applied at too lbs per acres (2-5 lbs per 1,000 sq. ft.) if seeding in
October or November. Runoff control measures shall be installed, as needed, prior
to seeding to reduce the potential for erosion of the newly seeded area.
3.2.9• Topsoiling
Unless described otherwise, final stabilization will be completed with topsoil and
seeding, mulching and/or sodding. Topsoiling shall be performed in accordance
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with NYS Standards and Specifications and the Landscaping Plans and Details shown
on Sheet C-400 of the Construction Drawings (Appendix I). All sod and seed areas
are to receive a minimum of 4" of topsoil. Lime will be applied at a rate that shall
achieve a soil pH of 6.0.Topsoil shall be further amended with fertilizer with 6,600
lbs Of 5-10-10 or equivalent per acre (14 lbs./loo sq.ft.).
3.2.1o. Surface Roughening
Surface roughening will aid in the establishment of vegetative cover from seed,
reduce runoff velocity and increase infiltration, and trap sediment. Surface
roughening includes creating horizontal grooves across a slope (i.e., perpendicular
to the downslope direction) using a spike-tooth harrow, tilling equipment, disking
attachments, or tracking the area with appropriate construction equipment. The
type of surface roughening techniques will be determined in the field by the
Contractor and the Owner's on-site Representative.
3.2.11. Permanent Seeding
Permanent seeding and sodding shall be implemented per NYS Standards and
Specifications and the Landscaping Plan and Details shown on Sheet C-400 of the
Construction Drawings (Appendix I). This seeding will be applied to provide a
protective cover following achievement of final grades or during a long-term
dormancy period (e.g., longer than 1 year). Consistent with temporary seeding,
permanent seeding should be done promptly after completing the final grading
activities to minimize the need for surface roughening. Areas to be seeded will be
scarified as needed prior to seeding. Runoff control measures will be installed, as
needed,prior to seeding to reduce the potential for erosion of the newly seeded area.
3.3• Inspection and Maintenance of Erosion and Sediment Controls
3.3.1• Inspection and Contractor Notification Requirements
Inspections of erosion and sediment controls will be performed to confirm that this
SWPPP is being implemented and remains functional relative to site conditions and
actual project activities. Prior to land disturbing activities (excluding installation of
erosion and sediment control practices),a Qualified Inspector(see Section 3.3.5)will
perform a pre-construction site assessment to verify that erosion and sediment
controls are properly installed and functional.
During construction activities, all erosion and sediment control practices and
pollution prevention measures implemented within the active work area will be
inspected daily by a Trained Contractor(as specified in Section 3.3.5)to ensure that
they are being maintained in effective operating conditions at all times. If
deficiencies are identified, the Contractor (or subcontractors) will begin
implementing corrective actions within one (1)business day and shall complete the
corrective actions in a reasonable time frame.
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Throughout the active construction period, a Qualified Inspector(see Section 3.3.5)
will conduct inspections of all site areas affected by construction at least once every
7 calendar days. If more than five (5) acres of soil is disturbed, inspection
frequencies will increase to at least twice every 7 calendar days. These two (2)
inspections will be separated by a minimum of two (2) full calendar days. At a
minimum, the Qualified Inspector will inspect all erosion and sediment control
practices and pollution prevention measures to ensure integrity and effectiveness,
until the Site is deemed sufficiently stable and no longer requiring inspection.
Inspections include all disturbed areas that have not achieved final stabilization, all
points of discharge to natural surface waterbodies within or immediately adjacent
to the Site, and all points of stormwater discharge from the Site. After each
inspection, the Qualified Inspector will prepare an inspection report in accordance
with Section 3.5.1 within one(1)business day of the completion of an inspection,the
Qualified Inspector will notify the Owner's on-site Representative and/or the
Engineer and appropriate Contractor (or subcontractors) of any necessary
corrective actions. The Contractor (or subcontractor) will begin implementing the
corrective actions within one(1)business day of the inspection notification and will
complete the corrective action in a reasonable time frame, unless a modified
timetable is approved by the Owner's on-site Representative and/or the Engineer.
3.3.2• Inspections During Shutdown
In the event project activities are temporarily suspended(e.g.,winter shutdown)and
temporary stabilization measures have been applied to all disturbed areas, the
Qualified Inspector will conduct a site inspection at least once every 30 calendar
days. The Owner's Representative will notify the Division of Water (DOW) Water
(SPDES) Program contact at the NYSDEC Regional Office (5o Circle Road, Stony
Brook, NY 11790-3409), in writing prior to reducing the inspection frequency.
Additionally, the Qualified Inspector can discontinue these inspections if all
disturbed areas of the site (as of the project shutdown date) have achieved final
stabilization.
3.3.3• Maintenance
The contractor is responsible for all maintenance of erosion and sediment controls
in accordance with this SWPPP. Maintenance or repair of installed erosion and
sediment controls will be initiated within 1 business day following notification of
deficiencies unless a modified timetable is approved by the Owner's on-site
Representative and completed in a reasonable timeframe (i.e., prior to the next
scheduled inspection). Erosion and sediment control measures will be maintained
for the duration of the project until such time as all permanent stabilization
measures have become fully established and a satisfactory final Site inspection
(described in Section 3.6)has been performed by a Qualified Inspector.
The following maintenance practices shall be used to maintain erosion and
sediment controls:
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• Excess sediment buildup will be removed from silt fencing when it has reached
one-third the height of the barrier/fence. Fabric will be replaced when bulges
or tears develop; Silt fencing will be reinstalled if the fabric is not securely
attached to the wire mesh and fence posts, the fabric is not properly
entrenched in the ground, or if the fence posts are not properly secured in the
ground.
• Stabilized construction entrances will be stabilized by topping with aggregate
as necessary and as construction proceeds. Sediment which is washed or
tracked to public rights-of-way will be removed immediately.
• Excess sediment buildup will be removed from filter fabric drop inlet and curb
inlet protection.
• Concrete washout areas will be inspected and emptied as needed.
• The site shall be maintained and remain free of refuse and debris.
• All seeded areas will be fertilized, reseeded as necessary, and mulched to
maintain a vigorous, dense vegetative cover.
3.3.4• Contractor Compliance Certification
The Contractor and subcontractors are required to certify that their respective
activities will comply with the relevant portions of this SWPPP. All such
certifications will be in writing and retained at the Site with the SWPPP document.
The Contractor certification statement and signature page are included with this
SWPPP (Section 5.2). In accordance With GP-0-20-001, all Contractors and
subcontractors must provide contact information and describe the elements of this
SWPPP they are responsible for.
3.3.5• Training Requirements
The Contractor and subcontractors involved in soil-disturbing activities will
identify at least one person from their company that will be responsible for
inspection of the SWPPP components defined herein. This individual will have
completed the requirements to be considered a "Trained Contractor" in accordance
with GP-0-20-001,meaning they have received four(4)hours of NYSDEC endorsed
training in proper erosion and sediment control principles from a Soil and Water
Conservation District, or other NYSDEC endorsed entity. At least one Trained
Contractor must be on-site daily when soil-disturbing activities are being
performed. Note that the Trained Contractor cannot perform the duties of the
Qualified Inspector unless the Trained Contractor also meets the Qualified Inspector
qualifications.
The Qualified Inspector will meet the requirements of GP-0-20-001, meaning they
will be a licensed Professional Engineer, Certified Professional in Erosion and
Sediment Control (CPESC), Registered Landscape Architect, NYSDEC-endorsed
individual, or someone working under the direct supervision of, and at the same
company as, the licensed Professional Engineer or Registered Landscape Architect,
provided they have received four (4) hours of NYSDEC endorsed training in proper
erosion and sediment control principles from a Soil and Water Conservation District,
or other NYSDEC endorsed entity.
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A site-specific employee training program will be developed and implemented to
educate employees and outside contractors on the requirements of the SWPPP. This
education program will include background on the components and goals of the
SWPPP. The program will also include hands-on training in erosion controls, spill
prevention and response, good housekeeping, proper material handling, disposal
and control of waste, equipment fueling, and proper storage, washing, and
inspection procedures. The SWPPP must also identify periodic dates for such
training,which must be conducted at a minimum of one(1)training session per year.
On-site employees will be trained prior to their first day on-site.
The training program shall be reviewed annually to determine its effectiveness and
make any necessary changes to the program. Workers in critical areas (i.e.,
unloading personnel) will also have specific SWPPP procedures and activities
emphasized in their training. All specific SWPPP training will be documented, and
sign-in sheets shall be provided for each session,both of which will be retained with
the SWPPP on-site.
Periodic employee meetings will cover the following items:
• Environmental or health and safety incidents;
• Upcoming training sessions;
• Brief reminders on good housekeeping, pollution prevention and response
procedures, and material handling practices; and
• New management procedures or other changes to the SWPPP.
• Employee training program topics will include the following:
• Summary of the SWPPP's purpose and what the SWPPP includes;
• Review of good housekeeping measures, maintenance of BMP's, and
management of stockpile material onsite;
• Demonstrate proper sampling and reporting requirements;
• Review and demonstrate basic spill procedures and how to identify them;
• Indicate proper disposal methods and locations, and
• Inform employees with emergency contacts and telephone numbers.
3.4• Pollution Prevention
In addition to the good housekeeping practices described under Section 3.2.7, the
Contractor will implement measures to prevent spills from occurring and to properly
respond to spill emergencies. The Contractor will also adhere to all applicable local,
state, and federal regulations in the event of a spill.
At a minimum, the following sections outline pollution prevention procedures that will
be implemented by the Contractor during construction.
3.4.1. Spill Prevention Plan
Prior to mobilization, all equipment to be delivered to the Site, will be visually
inspected by the Contractor for potential sources of spills or leakage of hydraulic
fluid, engine oil, transmission fluid, fuel, and grease. For potential sources that are
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identified, the Contractor will remove and replace the subject equipment and/or
make available on-site the necessary materials to manage the source and impacted
area in the event of a spill or leakage.At a minimum, the Site will be equipped with
at least one spill kit consisting of sorbents,absorbent booms,and fire extinguishers.
In the event of a spill or leakage, the Contractor will be responsible for safely
mitigating the source condition and removal/disposal of any impacted materials.
The Contractor will take the following precautions to minimize the potential for
spills of fuel or lubricants during the construction activities:
• Place secondary containment measures around all fuel and lubricant storage
tanks/units.
• Perform refueling activities on level ground within designated
vehicle/equipment maintenance and fueling areas, away from steep slopes
and runoff conveyance features (e.g., ditches, storm sewers, catch basins,
etc.).
• Do not leave equipment unattended during refueling.
• Smoking, snacking, eating, etc., only in areas designated for such activities,
that are located away from the refueling area.
• Engines will not be running when refilling fuel tanks.
• Replacing fuel caps immediately after filling and before starting the engine.
• Securing fuel pump dispensers when not in use to avoid accidental fuel
release.
• Perform inspections and tests of equipment and portable fuel tanks to check
for leaks and evaluate the condition of hoses and connections. If leaks are
observed,transfer the contents to an alternate tank/storage unit and replace
the equipment/tank or repair the leak, as appropriate.
• Maintain all equipment in accordance with the manufacturer's
specifications.
• Operate all vehicles and equipment safely and park them a safe distance away
from site hazards and sensitive resources.
3.4.2• Spill Response Plan
The Contractor will be responsible for implementing all appropriate spill response
procedures when responding to accidental releases of oil, and other pollutant
products or materials during the performance of construction activities. All spills
will be immediately reported by the Contractor to federal, state, and local agencies
as required, as well as the Owner and Owner's Representatives.
Reporting requirements of spills to necessary agencies will be in accordance with
applicable regulations. The Contractor will be responsible for implementing
appropriate spill response procedures,which may include the following:
• Ceasing operation of the affected equipment.
• Containing the spill: If the spilled material is floating on a water surface,
spill-absorbent pads/booms will be placed across the path of the floating
spill. If the spilled material sinks below the water surface, a dam, weir, or
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other containment method will be used to stop the flow of the spilled
material. If the spill occurs on land, a ditch, dam, or other containment unit
will be constructed to stop the flow of the spilled material. Absorbent
material will be applied as necessary.
• Cleaning up the spill: Spills in water will be recovered using the most
appropriate measure until the spilled material is recovered(and no sheens or
other evidence of the spill are observed). Spills on land will be recovered
using pumps, sorbent material, hand tools, and/or heavy equipment, as
necessary, until the spilled material is recovered.
• Containerizing spill materials: Spilled materials, impacted soils, sorbent
pads, and other spill cleanup or containment materials will be containerized
in NYS Department of Transportation-approved containers. The containers
will be labeled with the waste type and date of accumulation in accordance
with applicable regulations. Samples will be collected to characterize the
spilled materials for disposal, as required.
• Disposing of spill materials: Impacted materials and spill cleanup debris will
be disposed at a facility permitted to accept such materials.
• Performing post-spill maintenance: Following cleanup of the spill, the
Contractor's project manager will verify that all used spill cleanup material
and equipment has been disposed, or decontaminated, as appropriate.If the
equipment that caused the spill cannot be properly repaired, replacement
equipment will be obtained.
In the event of a spill and/or emergency, the Contractor's project manager will
also complete the activities described below:
• Immediately notify appropriate site personnel (i.e., Owner's on-site
Representative).
• Inform all site personnel of any potential hazards and required levels of
personal protective equipment(PPE)to conduct the cleanup.
• Record the following information pertaining to the spill:
o Name of the person(s) who identified and reported the spill
incident;
o Date, time, and location;
o Brief description and cause of the spill;
o Estimated quantity and type of material spilled;
o Extent and description of impacts to soil, sediment, and water
from the spill;
o Any damages or injuries related to the spill;
o Actions completed to stop, contain or control, and clean up the
spill.
• If there is an immediate threat to human health or the environment, the
Contractor will promptly notify the appropriate authorities (i.e., local
police, fire department, hospitals, and state and local emergency
response teams).
• Coordinate spill reporting to the appropriate agencies(e.g., NYSDEC).
1 ' 7 for. .,..
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3.5• Recordkeeping
SWPPP (and related documents) — a copy of this SWPPP, NOI, NOI Acknowledgement
Letter, inspection reports, contractor compliance certification, and any other relevant
documents will be retained on-site for the duration of project construction activities.
These documents will be retained in a secured location readily available to individuals
performing compliance inspections.
3.5.1• Weekly Inspections Reports
The Site will be inspected at a minimum of once every 7 calendar days or twice every
7 calendar days if more than five acres of soil remain disturbed (see Section 3.2.1).
Inspection reports will be prepared by a Qualified Inspector after every inspection.
At a minimum, the inspection report shall include and/or address the following:
Date and time of inspection.
Name and title of person(s)performing the inspection.
A description of the weather and soil conditions(e.g., dry,wet, saturated) at
the time of inspection.
A description of the condition of the runoff at all points of discharge from the
construction site,including any discharges of sediment and discharges from
conveyance systems (i.e.,pipes, culverts, and ditches) and overland flow.
A description of the condition of all natural surface waterbodies located
within, or immediately adjacent to, the property boundaries of the
construction which receive runoff from disturbed areas. This shall include
identification of any discharges of sediment to the surface waterbody.
Identification of all erosion and sediment control practices and pollution
prevention measures that need repair or maintenance.
Identification of all erosion and sediment control practices and pollution
prevention measures that were not installed properly or are not functioning
as designed and need to be reinstalled or replaced.
Description and sketch of areas with active soil disturbance activity, areas
that have been disturbed but are inactive at the time of the inspection, and
areas that have been stabilized (temporary and/or final) since the last
inspection.
• Current phase of construction of all post-construction stormwater
management practices and identification of construction that is not in
conformance with this SWPPP and technical standards.
• Corrective action(s)that must be taken to install,repair,replace,or maintain
erosion and sediment control practices and pollution prevention measures;
and to correct deficiencies identified with the installation of the PCSM
practice(s) (if applicable).
Identification and status of all corrective actions that were required by
previous inspection.
• Digital photographs, with date stamp, that clearly show the condition of all
practices that have been identified as needing corrective actions. The
Qualified Inspector shall attach paper color copies of the digital photographs
to the inspection report being maintained on-site within seven (7) calendar
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days of the date of the inspection. The Qualified Inspector shall also take
digital photographs,with date stamp, that clearly show the condition of the
practice(s) after the corrective action has been completed. The Qualified
Inspector shall attach paper color copies of the digital photographs to the
inspection report that documents the completion of the corrective action
work within seven(7)calendar days of that inspection.
Within one business day of the completion of an inspection, the Qualified Inspector
shall notify the Owner or Owner's on-site Representative and appropriate
Contractor or subcontractor personnel of any corrective actions that need to be
taken. The contractor or subcontractor shall begin implementing the corrective
actions within one business day of this notification and shall complete the corrective
actions in a reasonable time frame. All inspection reports will be signed by the
Qualified Inspector and copies maintained on-site with the SWPPP.A Construction
Duration Inspections Checklist is included as Appendix C.
3.5.2. Records Retention
Copies of this SWPPP,NOI,NOI Acknowledgement Letter,and any reports submitted
or prepared in conjunction with this SWPPP will be retained by the Owner for a
period of at least 5 years from the date that the NYSDEC receives the Notice of
Termination(NOT).
3.5.3• SWPPP Amendments
The SWPPP will be amended for any of the following cases:
• When a significant change in design, remediation, operation, or
maintenance occurs which may have a significant effect on the potential for
discharge of pollutants to the waters of the United States and which has not
otherwise been addressed in this SWPPP.
• When the SWPPP proves to be ineffective in eliminating or significantly
minimizing pollutants from sources identified in this SWPPP.
• When the SWPPP proves to be ineffective in achieving the general objectives
of controlling pollutants in stormwater discharges from the Site.
• To identify any new contractor or subcontractor that will implement any
measure of the SWPPP.
Modifications to the SWPPP will be described and recorded on the Construction
Duration Inspection Checklist form in Appendix C.
3.6.Final Stabilization and Cleanup
After construction is complete the disturbed areas not containing pavement, riprap,
cobble, etc.,will be permanently stabilized.Once construction activities are complete in
an area, it shall be stabilized with permanent seed and mulch within seven(7) days.
A final Site inspection will be performed and documented by the Qualified Inspector to
verify that all disturbed areas are suitably stabilized (i.e., uniform perennial vegetative
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cover with at least 8o percent density, permanent landscape mulches, or impervious
cover). Final stabilization will be implemented in accordance with NYS Standards and
Specifications and the Construction Drawings (Appendix I). If disturbed areas are not
sufficiently stabilized, measures will be implemented to correct the substandard areas
and a second final Site inspection will be performed.Following successful completion of
the final site stabilization, the Contractor will remove any temporary erosion and
sediment control features that are no longer needed, as appropriate.
4.0 POST-CONSTRUCTION STORMWATER MANAGEMENT
Redevelopment of the site will result in an increase in the percentage of impervious area
relative to the total site area. A hydraulic analysis of pre-development and post-
development conditions has been performed as part of the design of post-construction
stormwater management. The Site was divided in to 8 different drainages areas based on
the post-development grading and drainage design. In order to provide a more accurate
comparison between pre- and post-developed conditions, stormwater calculations were
performed for each drainage area individually.
4.1.Water Quality Volume Calculations
The Proposed Development for the Site involves both new development and
redevelopment construction,which results in an overall increase in impervious area.Per
NYSDEC requirements, post-construction stormwater management practices (SMPs)
should reduce the total Water Quality Volume ("WQv") by application of runoff
reduction techniques and standard SMPs with runoff reduction volume (RRv) capacity
for all new contributing impervious areas; and to capture and treat a minimum Of 25%
of the WQv from the previously disturbed, impervious area by the application of
standard SMPs.
Post-development stormwater runoff will be managed using infiltration practices (i.e.,
Drainage Leaching Pools/Dry Wells). Since underlying soils at the Site are estimated to
have an infiltration rate greater than 5.00 inches per hour, an additional pretreatment
volume of l00%of the WQv was factored into the Water Quality Volume calculations per
NYSDEC Stormwater Design Manual requirements.
Water Quality Volume Calculations for each drainage area have been included in
Appendix F. For this Site, the go% rainfall event is assumed to be 1.5 inches. Based on
the calculations, all drainage areas provide more storage volume than what is required
to capture and treat 100% of the Water Quality Volumes calculated for each drainage
area.Calculations were also provided to demonstrate that the Water Quality Volume will
fully infiltrate in less than 48 hours as required by NYSDEC criteria.
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Table 4-1 Post-Developed Drainage Conditions Water Quality Volume
and Storage Summary
Drainage• •. Water Quality Storage Volume
Volume(ac-ft) Provided(ac-ft)
A 0.191 0.315
B 0.322 0.454
C 0.109 0.255
D o.o88 0.155
4.2.Water Quantity Volume Calculations
Precipitation data for the site was acquired using the National Oceanic and Atmospheric
Administration (NOAA) Atlas 14, Volume 1o, Version 3 Point Precipitation Frequency
Estimates online tool.Table 4-1 below lists the precipitation amounts for various storm
events for the Site.
Table 4-2 Site Precipitation Data
Storm Event Precipitation(in)
1-Year,24-Hour 2.84
2-Year,24-Hour 3.49
10-Year,24-Hour 5.44
loo-year,24-Hour 8.54
4.2.1. Pre-Development Conditions Analysis
A pre-development analysis was conducted to establish the existing conditions peak
discharge rates for the 10-year and too-year frequency storm events.The discharge
values correspond to the Overbank Flood Control Criteria (0,P) and Extreme Flood
Control Criteria (Qf) sizing criteria per GP-O-20-001. Channel Protection Volume
(Cpv)was not analyzed because there are no proposed changes to site hydrology that
increases the discharge rate from the Site.
Existing land cover types and their respective areas were identified and delineated
using BING aerial imagery and AutoCAD Civil3D to calculate the weighted Curve
Number (CN) for each of the drainage areas. Areas were classified as one of the
following values:
1. Impervious Cover, CN = 98
2. Open Space(Lawns, Parks, etc.; Fair; HSG A), CN = 69
3. Woods(Fair; HSG A), CN = 6o
Time of concentration(Tc)paths for each individual drainage area were determined
for the site utilizing available topography data and calculated using United States
Department of Agriculture (USDA) Technical Release 55 (TR-55) Urban Hydrology
for Small Watersheds methodology for calculating travel time for sheet flow and
shallow concentrated flow as applicable.
A pre-developed conditions drainage plan depicting drainage area limits and Tc
paths can be found in Appendix G, Figure 1. Peak discharges for each drainage area
were calculated for both the 10-Year,24-hour and too-Year, 24-hour storm events
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using the SCS Method for Type III rainfall distribution using TR-55. The existing
conditions peak discharges for each drainage area are summarized in Table 4-3•
Table 4-3 Pre-Developed Drainage Conditions Summary
Runoff1
Volume Dischar , 0 . .
WeightedDrainage (ac-ft) (cfs)ge (ac-ft)
Area 1 •. 1 •. 11 11
24-HourIur 24-HourI
StormI 1 I
A 1.95 6o 0.46 0.255 1.81 o.6o8 4.45
B 2.32 6o 0.49 0.304 2.04 0.723 5.29
C 0.87 62 0.85 0.219 1.19 0.509 2.96
D 1.54 72 o.68 0.211 1.32 0.421 2.76
Detailed calculations for each drainage area can be found in Appendix G.
4.2.2. Post-Development Conditions Analysis
A post-development analysis was conducted to design post-construction
stormwater management features that meet Water Quality Volume,Overbank Flood
Control Criteria(Qp)and Extreme Flood Control Criteria(Qf) sizing criteria per GP-
O-20-001. Channel Protection Volume (Cpv)was not analyzed because there are no
proposed changes to site hydrology that increases the discharge rate from the Site
and is not required for infiltration practices.
Qp control sizing criteria is in place to prevent an increase in the frequency and
magnitude of out-of-bank flooding generated by urban development. If post-
development peak discharges exceed the pre-development condition, then the
stormwater management system needs to be designed to store and attenuate the
post-development 10-year, 24-hour peak discharge rate to the pre-development
rate.
Qf control criteria is included to prevent the increased risk of flood damage from
large storm events, maintain the boundaries of the pre-development 10 o-year
floodplain, and protect the physical integrity of stormwater management practices.
If post-development peak discharges exceed the pre-development condition, then
the stormwater management system needs to be designed to store and attenuate the
post-development too-year, 24-hour peak discharge rate to the pre-development
rate.
Proposed land cover types and their respective were based off the Proposed Site
Plans (Appendix I) and were used to calculate the weighted Curve Number (CN) for
each of the drainage areas.Areas were classified as one of the following values:
1. Impervious Cover,CN = 98
2. Open Space (Lawns, Parks, etc.; Fair; HSG A), CN = 69
The minimum Time of concentration(Tc)paths for all drainage areas were assumed
to be 6.o minutes, which is the minimum value per United States Department of
P.W.GROSSER CONSULTING,INC•P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
631.589.6353 -WWW.PWGROSSER.COM.PWGC.INFO@a PWGROSSER.COM
BOHEMIA • MANHATTAN • SARATOGA SPRINGS • SYRACUSE • SHELTON, CT
PACIC
CLIENT DRIVEN SOLUTIONS
Agriculture (USDA) Technical Release 55 (TR-55) Urban Hydrology for Small
Watersheds methodology.
A post-developed conditions drainage plan depicting drainage area limits,proposed
cover types, and drainage feature layout can be found in Appendix G, Figure 2. Peak
discharges for each drainage area were calculated for both the lo-Year,24-hour and
loo-Year, 24-hour storm events using the SCS Method for Type III rainfall
distribution using TR-5 5•
Leaching pools/dry wells were sized and quantified to attenuate post-development
peak discharge rates for both the 10-year, 24-hour and loo-year, 24-hour storm
events to be equal to or less than pre-development conditions.
Storage volumes provided for each drainage area are summarized in Table 4-1.
The post-developed conditions peak discharges for each drainage area are
summarized in Table 4-4•
Table 4-4 Post-Developed Drainage Conditions Summary
Runoff Peak Runoff Peak
DischargeVolume
•
Storm it m Storm Storm
A 1.95 8o 0.22 0.533 5.40 o.996 10.09
B 2.32 85 0.21 0.735 7.58 1.309 13.49
C o.87 77 0.22 0.379 3.79 0.734 7.34
D 1.54 83 0.10 0.279 3.43 0.5o8 6.23
The post-construction stormwater management system for the Proposed
Development provides a reduction in the peak discharge rates for the Site for
both the 10-year, 24-hour and ioo-year, 24-hour storm events. Detailed
calculations for each drainage area can be found in Appendix G.
4.3•Post-Construction Maintenance
The estimated maintenance schedule for the post-construction stormwater
management practices is summarized below.The Owner/Operator shall be responsible
for ensuring proper maintenance is performed as needed.
1. Catch Basins/Leaching Pools — Inspected monthly and pumped out and emptied
when sediment and debris accumulation exceeds 1o% of the structure's depth, or
dewatering capacity of structure between separate storm events is observed to be
impaired.
2. Drainage Piping - Inspected monthly and flushed (e.g.,via cleanouts) or unclogged
when sediment and debris is observed to reduce drainage capacity or flowrates.
00
P.W.GROSSER CONSULTING,INC-P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
631.589.6353 •WWW.PWGROSSER.COM-PWGC.INFO@a PWGROSSER.COM
BOHEMIA - MANHATTAN - SARATOGA SPRINGS - SYRACUSE - SHELTON, CT
PACIC
CLIENT DRIVEN SOLUTIONS
A Leaching Pool Operation, Maintenance and Management Inspection Checklist is
included as Appendix D.
5.0 CERTIFICATIONS
5.1. Preparers Certifications
"I certify that this document and all attachments were prepared under my direction and
supervision in accordance with the current SPDES General Permit. Qualified personnel
performed due diligence in gathering and evaluating the information contained in this
SWPPP. Based on my design and inquiry of the Owners and/or sponsors of the project, the
information contained in this SWPPP is true, accurate, and complete. I am aware that there
are significant penalties for submitting false information, including the possibility of fine
and imprisonment."
Bryan Grogan, PE
Preparers' Name Signature
Sr.Vice President P.W. Grosser Consulting
Title Firm Name
630 Johnson Avenue, Suite 7, Bohemia, NY 11716 (631)589-6353
Firm Address Firm Telephone Number
56655 Route 25
Southold, New York 11971
Site Address
Certification Date
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631.589.6353 •WWW.PWGROSSER.COM.PWGC.INFO@a PWGROSSER.COM
BOHEMIA • MANHATTAN • SARATOGA SPRINGS • SYRACUSE - SHELTON, CT
PACIC
CLIENT DRIVEN SOLUTIONS
5.2.Contractors&Subcontractors Compliance Certifications
"I hereby certify that I understand and agree to comply with the terms and conditions of the
SWPPP and agree to implement any corrective actions identified by the Qualified Inspector
during a site inspection.I also understand that the Owner or Operator must comply with the
terms and conditions of the most current version of the New York State Pollutant Discharge
Elimination System ("SPDES") general permit for stormwater discharges from site
activities and that it is unlawful for any person to cause or contribute to a violation of water
quality standards. Furthermore, I understand that certifying false, incorrect or inaccurate
information is a violation of the referenced permit and the laws of the State of New York and
could subject me to criminal, civil and/or administrative proceedings."
Trained Contractor's Name Signature
Responsible for the following SWPPP Measures:
Title
1.
2.
Firm Name
Firm Address
6.
Firm Telephone Number
7.
8.
Site Address
9.
10.
Certification Date
P.W.GROSSER CONSULTING,INC•P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
631.589.6353 •WWW.PWGROSSER.COM.PWGC.INFO@a PWGROSSER.COM
BOHEMIA • MANHATTAN • SARATOGA SPRINGS • SYRACUSE • SHELTON, CT
PACIC
CLIENT DRIVEN SOLUTIONS
APPENDIXA
USDA SOILS REPORT
P.W.GROSSER CONSULTING,INC•P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
631.589.6353•WWWPWGROSSER.COM•PWGC.INFO@PWGROSSER.COM
BOHEMIA - MANHATTAN SARATOGA SPRINGS SYRACUSE SHELTON, CT
USDA United States A product of the National Custom Soil Resource
Department of Cooperative Soil Survey,
Agriculture a joint effort of the United Report for
States Department of
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Federal agencies, State uffolk n
Natural agencies including the
Resources Agricultural Experiment N Y
Conservation Stations, and local ew ork
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June 8, 2023
Preface
Soil surveys contain information that affects land use planning in survey areas.
They highlight soil limitations that affect various land uses and provide information
about the properties of the soils in the survey areas. Soil surveys are designed for
many different users, including farmers, ranchers, foresters, agronomists, urban
planners, community officials, engineers, developers, builders, and home buyers.
Also, conservationists, teachers, students, and specialists in recreation, waste
disposal, and pollution control can use the surveys to help them understand,
protect, or enhance the environment.
Various land use regulations of Federal, State, and local governments may impose
special restrictions on land use or land treatment. Soil surveys identify soil
properties that are used in making various land use or land treatment decisions.
The information is intended to help the land users identify and reduce the effects of
soil limitations on various land uses. The landowner or user is responsible for
identifying and complying with existing laws and regulations.
Although soil survey information can be used for general farm, local, and wider area
planning, onsite investigation is needed to supplement this information in some
cases. Examples include soil quality assessments (http://www.nres.usda.gov/wps/
portal/nres/main/soils/health/)and certain conservation and engineering
applications. For more detailed information, contact your local USDA Service Center
(https:Hoffices.sc.egov.usda.gov/locator/app?agency=nres)or your NRCS State Soil
Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/?
cid=nres142p2_053951).
Great differences in soil properties can occur within short distances. Some soils are
seasonally wet or subject to flooding. Some are too unstable to be used as a
foundation for buildings or roads. Clayey or wet soils are poorly suited to use as
septic tank absorption fields. A high water table makes a soil poorly suited to
basements or underground installations.
The National Cooperative Soil Survey is a joint effort of the United States
Department of Agriculture and other Federal agencies, State agencies including the
Agricultural Experiment Stations, and local agencies. The Natural Resources
Conservation Service (NRCS) has leadership for the Federal part of the National
Cooperative Soil Survey.
Information about soils is updated periodically. Updated information is available
through the NRCS Web Soil Survey, the site for official soil survey information.
The U.S. Department of Agriculture (USDA) prohibits discrimination in all its
programs and activities on the basis of race, color, national origin, age, disability,
and where applicable, sex, marital status, familial status, parental status, religion,
sexual orientation, genetic information, political beliefs, reprisal, or because all or a
part of an individual's income is derived from any public assistance program. (Not
all prohibited bases apply to all programs.) Persons with disabilities who require
2
alternative means for communication of program information (Braille, large print,
audiotape, etc.) should contact USDA's TARGET Center at(202) 720-2600 (voice
and TDD). To file a complaint of discrimination, write to USDA, Director, Office of
Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or
call (800) 795-3272 (voice) or(202) 720-6382 (TDD). USDA is an equal opportunity
provider and employer.
3
Contents
Preface....................................................................................................................2
HowSoil Surveys Are Made..................................................................................5
SoilMap.................................................................................................................. 8
SoilMap................................................................................................................9
Legend................................................................................................................10
MapUnit Legend................................................................................................ 11
MapUnit Descriptions.........................................................................................11
Suffolk County, New York................................................................................13
HaA—Haven loam, 0 to 2 percent slopes................................................... 13
References............................................................................................................14
4
How So'll Surve Are Made
Soil surveys are made to provide information about the soils and miscellaneous
areas in a specific area. They include a description of the soils and miscellaneous
areas and their location on the landscape and tables that show soil properties and
limitations affecting various uses. Soil scientists observed the steepness, length,
and shape of the slopes; the general pattern of drainage; the kinds of crops and
native plants; and the kinds of bedrock. They observed and described many soil
profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The
profile extends from the surface down into the unconsolidated material in which the
soil formed or from the surface down to bedrock. The unconsolidated material is
devoid of roots and other living organisms and has not been changed by other
biological activity.
Currently, soils are mapped according to the boundaries of major land resource
areas (MLRAs). MLRAs are geographically associated land resource units that
share common characteristics related to physiography, geology, climate, water
resources, soils, biological resources, and land uses (USDA, 2006). Soil survey
areas typically consist of parts of one or more MLRA.
The soils and miscellaneous areas in a survey area occur in an orderly pattern that
is related to the geology, landforms, relief, climate, and natural vegetation of the
area. Each kind of soil and miscellaneous area is associated with a particular kind
of landform or with a segment of the landform. By observing the soils and
miscellaneous areas in the survey area and relating their position to specific
segments of the landform, a soil scientist develops a concept, or model, of how they
were formed. Thus, during mapping, this model enables the soil scientist to predict
with a considerable degree of accuracy the kind of soil or miscellaneous area at a
specific location on the landscape.
Commonly, individual soils on the landscape merge into one another as their
characteristics gradually change. To construct an accurate soil map, however, soil
scientists must determine the boundaries between the soils. They can observe only
a limited number of soil profiles. Nevertheless, these observations, supplemented
by an understanding of the soil-vegetation-landscape relationship, are sufficient to
verify predictions of the kinds of soil in an area and to determine the boundaries.
Soil scientists recorded the characteristics of the soil profiles that they studied. They
noted soil color, texture, size and shape of soil aggregates, kind and amount of rock
fragments, distribution of plant roots, reaction, and other features that enable them
to identify soils. After describing the soils in the survey area and determining their
properties, the soil scientists assigned the soils to taxonomic classes (units).
Taxonomic classes are concepts. Each taxonomic class has a set of soil
characteristics with precisely defined limits. The classes are used as a basis for
comparison to classify soils systematically. Soil taxonomy, the system of taxonomic
classification used in the United States, is based mainly on the kind and character
of soil properties and the arrangement of horizons within the profile. After the soil
5
Custom Soil Resource Report
scientists classified and named the soils in the survey area, they compared the
individual soils with similar soils in the same taxonomic class in other areas so that
they could confirm data and assemble additional data based on experience and
research.
The objective of soil mapping is not to delineate pure map unit components; the
objective is to separate the landscape into landforms or landform segments that
have similar use and management requirements. Each map unit is defined by a
unique combination of soil components and/or miscellaneous areas in predictable
proportions. Some components may be highly contrasting to the other components
of the map unit. The presence of minor components in a map unit in no way
diminishes the usefulness or accuracy of the data. The delineation of such
landforms and landform segments on the map provides sufficient information for the
development of resource plans. If intensive use of small areas is planned, onsite
investigation is needed to define and locate the soils and miscellaneous areas.
Soil scientists make many field observations in the process of producing a soil map.
The frequency of observation is dependent upon several factors, including scale of
mapping, intensity of mapping, design of map units, complexity of the landscape,
and experience of the soil scientist. Observations are made to test and refine the
soil-landscape model and predictions and to verify the classification of the soils at
specific locations. Once the soil-landscape model is refined, a significantly smaller
number of measurements of individual soil properties are made and recorded.
These measurements may include field measurements, such as those for color,
depth to bedrock, and texture, and laboratory measurements, such as those for
content of sand, silt, clay, salt, and other components. Properties of each soil
typically vary from one point to another across the landscape.
Observations for map unit components are aggregated to develop ranges of
characteristics for the components. The aggregated values are presented. Direct
measurements do not exist for every property presented for every map unit
component. Values for some properties are estimated from combinations of other
properties.
While a soil survey is in progress, samples of some of the soils in the area generally
are collected for laboratory analyses and for engineering tests. Soil scientists
interpret the data from these analyses and tests as well as the field-observed
characteristics and the soil properties to determine the expected behavior of the
soils under different uses. Interpretations for all of the soils are field tested through
observation of the soils in different uses and under different levels of management.
Some interpretations are modified to fit local conditions, and some new
interpretations are developed to meet local needs. Data are assembled from other
sources, such as research information, production records, and field experience of
specialists. For example, data on crop yields under defined levels of management
are assembled from farm records and from field or plot experiments on the same
kinds of soil.
Predictions about soil behavior are based not only on soil properties but also on
such variables as climate and biological activity. Soil conditions are predictable over
long periods of time, but they are not predictable from year to year. For example,
soil scientists can predict with a fairly high degree of accuracy that a given soil will
have a high water table within certain depths in most years, but they cannot predict
that a high water table will always be at a specific level in the soil on a specific date.
After soil scientists located and identified the significant natural bodies of soil in the
survey area, they drew the boundaries of these bodies on aerial photographs and
6
Custom Soil Resource Report
identified each as a specific map unit. Aerial photographs show trees, buildings,
fields, roads, and rivers, all of which help in locating boundaries accurately.
7
Soil Map
The soil map section includes the soil map for the defined area of interest, a list of
soil map units on the map and extent of each map unit, and cartographic symbols
displayed on the map. Also presented are various metadata about data used to
produce the map, and a description of each soil map unit.
8
Custom Soil Resource Report
Go Soil Map
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Custom Soil Resource Report
MapLegendUnit
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
HaA Haven loam,0 to 2 percent 6.8 100.0%
slopes
Totals for Area of Interest 6.8 100.0%
Map Unit Descriptions
The map units delineated on the detailed soil maps in a soil survey represent the
soils or miscellaneous areas in the survey area. The map unit descriptions, along
with the maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the
landscape, however, the soils are natural phenomena, and they have the
characteristic variability of all natural phenomena. Thus, the range of some
observed properties may extend beyond the limits defined for a taxonomic class.
Areas of soils of a single taxonomic class rarely, if ever, can be mapped without
including areas of other taxonomic classes. Consequently, every map unit is made
up of the soils or miscellaneous areas for which it is named and some minor
components that belong to taxonomic classes other than those of the major soils.
Most minor soils have properties similar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, however, have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, or dissimilar, components. They
generally are in small areas and could not be mapped separately because of the
scale used. Some small areas of strongly contrasting soils or miscellaneous areas
are identified by a special symbol on the maps. If included in the database for a
given area, the contrasting minor components are identified in the map unit
descriptions along with some characteristics of each. A few areas of minor
components may not have been observed, and consequently they are not
mentioned in the descriptions, especially where the pattern was so complex that it
was impractical to make enough observations to identify all the soils and
miscellaneous areas on the landscape.
The presence of minor components in a map unit in no way diminishes the
usefulness or accuracy of the data. The objective of mapping is not to delineate
pure taxonomic classes but rather to separate the landscape into landforms or
landform segments that have similar use and management requirements. The
delineation of such segments on the map provides sufficient information for the
development of resource plans. If intensive use of small areas is planned, however,
onsite investigation is needed to define and locate the soils and miscellaneous
areas.
11
Custom Soil Resource Report
An identifying symbol precedes the map unit name in the map unit descriptions.
Each description includes general facts about the unit and gives important soil
properties and qualities.
Soils that have profiles that are almost alike make up a soil series. Except for
differences in texture of the surface layer, all the soils of a series have major
horizons that are similar in composition, thickness, and arrangement.
Soils of one series can differ in texture of the surface layer, slope, stoniness,
salinity, degree of erosion, and other characteristics that affect their use. On the
basis of such differences, a soil series is divided into soil phases. Most of the areas
shown on the detailed soil maps are phases of soil series. The name of a soil phase
commonly indicates a feature that affects use or management. For example, Alpha
silt loam, 0 to 2 percent slopes, is a phase of the Alpha series.
Some map units are made up of two or more major soils or miscellaneous areas.
These map units are complexes, associations, or undifferentiated groups.
A complex consists of two or more soils or miscellaneous areas in such an intricate
pattern or in such small areas that they cannot be shown separately on the maps.
The pattern and proportion of the soils or miscellaneous areas are somewhat similar
in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example.
An association is made up of two or more geographically associated soils or
miscellaneous areas that are shown as one unit on the maps. Because of present
or anticipated uses of the map units in the survey area, it was not considered
practical or necessary to map the soils or miscellaneous areas separately. The
pattern and relative proportion of the soils or miscellaneous areas are somewhat
similar. Alpha-Beta association, 0 to 2 percent slopes, is an example.
An undifferentiated group is made up of two or more soils or miscellaneous areas
that could be mapped individually but are mapped as one unit because similar
interpretations can be made for use and management. The pattern and proportion
of the soils or miscellaneous areas in a mapped area are not uniform. An area can
be made up of only one of the major soils or miscellaneous areas, or it can be made
up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example.
Some surveys include miscellaneous areas. Such areas have little or no soil
material and support little or no vegetation. Rock outcrop is an example.
12
Custom Soil Resource Report
Suffolk County, New York
HaA—Haven loam, 0 to 2 percent slopes
Map Unit Setting
National map unit symbol: 9x6v
Elevation: 0 to 310 feet
Mean annual precipitation: 45 to 50 inches
Mean annual air temperature: 50 to 54 degrees F
Frost-free period: 150 to 225 days
Farmland classification: All areas are prime farmland
Map Unit Composition
Haven and similar soils: 75 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Haven
Setting
Landform: Outwash plains
Landform position (two-dimensional):Summit
Landform position (three-dimensional):Tread
Down-slope shape: Convex
Across-slope shape:Convex
Parent material: Loamy glaciofluvial deposits over sandy and gravelly glaciofluvial
deposits
Typical profile
Oa-0 to 2 inches: highly decomposed plant material
H1 -2 to 5 inches: loam
H2-5 to 19 inches: loam
BC- 19 to 28 inches: gravelly loam
C-28 to 60 inches: stratified gravelly sand
Properties and qualities
Slope:0 to 2 percent
Depth to restrictive feature: More than 80 inches
Drainage class:Well drained
Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high
(0.20 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Low(about 4.3 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 1
Hydrologic Soil Group: B
Ecological site: F149BY006NY-Well Drained Outwash
Hydric soil rating: No
13
References
American Association of State Highway and Transportation Officials (AASHTO).
2004. Standard specifications for transportation materials and methods of sampling
and testing. 24th edition.
American Society for Testing and Materials (ASTM). 2005. Standard classification of
soils for engineering purposes. ASTM Standard D2487-00.
Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of
wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife
Service FWS/OBS-79/31.
Federal Register. July 13, 1994. Changes in hydric soils of the United States.
Federal Register. September 18, 2002. Hydric soils of the United States.
Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric
soils in the United States.
National Research Council. 1995. Wetlands: Characteristics and boundaries.
Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service.
U.S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/
nres/detail/national/soils/?cid=nres 142p2_054262
Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for
making and interpreting soil surveys. 2nd edition. Natural Resources Conservation
Service, U.S. Department of Agriculture Handbook 436. http://
www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577
Soil Survey Staff. 2010. Keys to soil taxonomy. 11 th edition. U.S. Department of
Agriculture, Natural Resources Conservation Service. http://
www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nresl42p2_053580
Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and
Delaware Department of Natural Resources and Environmental Control, Wetlands
Section.
United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of
Engineers wetlands delineation manual. Waterways Experiment Station Technical
Report Y 87-1.
United States Department of Agriculture, Natural Resources Conservation Service.
National forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/
home/?cid=nres 142p2_053374
United States Department of Agriculture, Natural Resources Conservation Service.
National range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/
detail/national/landuse/rangepasture/?cid=stelprdb1043084
14
Custom Soil Resource Report
United States Department of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 430-VI. http://www.nres.usda.gov/wps/portal/
nres/detail/soils/scientists/?cid=nres 142p2_054242
United States Department of Agriculture, Natural Resources Conservation Service.
2006. Land resource regions and major land resource areas of the United States,
the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook
296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/?
cid=nres 142p2_053624
United States Department of Agriculture, Soil Conservation Service. 1961. Land
capability classification. U.S. Department of Agriculture Handbook 210. http://
www.nres.usda.gov/Internet/FSE_DOCUMENTS/nresl42p2_052290.pdf
15
PACIC
CLIENT DRIVEN SOLUTIONS
APPENDIX B
USDA LONG ISLAND DEPTH TO WATER VIEWER REPORT
P.W.GROSSER CONSULTING,INC•P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
631.589.6353•WWWPWGROSSER.COM•PWGC.INFO@PWGROSSER.COM
BOHEMIA - MANHATTAN SARATOGA SPRINGS SYRACUSE SHELTON, CT
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PACIC
CLIENT DRIVEN SOLUTIONS
APPENDIX C
CONSTRUCTION DURATION
INSPECTION CHECKLIST
P.W.GROSSER CONSULTING,INC•P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
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BOHEMIA - MANHATTAN SARATOGA SPRINGS SYRACUSE SHELTON, CT
CONSTRUCTION DURATION INSPECTIONS Page I of
SITE PLAN/SKETCH
Inspector (print name) Date of Inspection
Qualified Inspector(print name) Qualified Inspector Signature
The above signed acknowledges that, to the best of his/her knowledge, all information provided on the
forms is accurate and complete.
November 2016 Page F.5 New York State Standards and Specifications
For Erosion and Sediment Control
CONSTRUCTION DURATION INSPECTIONS Page 2 of
Maintaining Water Quality
Yes No NA
[ ] [ ] [ ] Is there an increase in turbidity causing a substantial visible contrast to natural conditions at the
outfalls?
Is there residue from oil and floating substances,visible oil film, or globules or grease at the
outfalls?
[ ] [ ] [ All disturbance is within the limits of the approved plans.
Have receiving lake bay, stream, and/or wetland been impacted by silt from project?
Housekeeping
1. General Site Conditions
Yes No NA
Is construction site litter, debris and spoils appropriately managed?
[ ] [ ] [ Are facilities and equipment necessary for implementation of erosion and sediment control in
working order and/or properly maintained?
[ ] [ ] [ ] Is construction impacting the adjacent property?
[ ] [ ] [ ] Is dust adequately controlled?
2. Temporary Stream Crossing
Yes No NA
[ ] [ ] [ ] Maximum diameter pipes necessary to span creek without dredging are installed.
[ ] [ ] [ ] Installed non-woven geotextile fabric beneath approaches.
[ ] [ ] [ ] Is fill composed of aggregate (no earth or soil)?
[ ] [ ] [ ] Rock on approaches is clean enough to remove mud from vehicles &prevent sediment from
entering stream during high flow.
3. Stabilized Construction Access
Yes No NA
[ ] [ ] [ ] Stone is clean enough to effectively remove mud from vehicles.
[ ] [ ] [ ] Installed per standards and specifications?
[ ] [ ] [ ] Does all traffic use the stabilized entrance to enter and leave site?
[ ] [ ] [ ] Is adequate drainage provided to prevent ponding at entrance?
Runoff Control Practices
1. Excavation Dewatering
Yes No NA
Upstream and downstream berms (sandbags, inflatable dams, etc.) are installed per plan.
[ ] [ ] [ ] Clean water from upstream pool is being pumped to the downstream pool.
[ ] [ ] [ ] Sediment laden water from work area is being discharged to asilt-trapping device.
[ ] [ ] [ ] Constructed upstream berm with one-foot minimum freeboard.
November 2016 Page F.6 New York State Standards and Specifications
For Erosion and Sediment Control
CONSTRUCTION DURATION INSPECTIONS Page 3 of
Runoff Control Practices (continued)
2. Flow Spreader
Yes No NA
[ ] [ ] [ ] Installed per plan.
[ ] [ ] [ ] Constructed on undisturbed soil,not on fill, receiving only clear,non-sediment laden flow.
[ ] [ ] [ ] Flow sheets out of level spreader without erosion on downstream edge.
3. Interceptor Dikes and Swales
Yes No NA
[ ] [ ] [ ] Installed per plan with minimum side slopes 2H:1 V or flatter.
[ ] [ ] [ ] Stabilized by geotextile fabric, seed, or mulch with no erosion occurring.
[ ] [ ] [ ] Sediment-laden runoff directed to sediment trapping structure
4. Stone Check Dam
Yes No NA
[ ] [ ] [ ] Is channel stable? (flow is not eroding soil underneath or around the structure).
[ ] [ ] [ ] Check is in good condition(rocks in place and no permanent pools behind the structure).
Has accumulated sediment been removed?.
5. Rock Outlet Protection
Yes No NA
[ ] [ ] [ ] Installed per plan.
[ ] [ ] [ ] Installed concurrently with pipe installation.
Soil Stabilization
1. Topsoil and Spoil Stockpiles
Yes No NA
[ ] [ ] [ ] Stockpiles are stabilized with vegetation and/or mulch.
[ ] [ ] [ ] Sediment control is installed at the toe of the slope.
2. Revegetation
Yes No NA
[ ] [ ] [ ] Temporary seedings and mulch have been applied to idle areas.
[ ] [ ] [ ] 4 inches minimum of topsoil has been applied under permanent seedings
Sediment Control Practices
1. Silt Fence and Linear Barriers
Yes No NA
Installed on Contour, 10 feet from toe of slope (not across conveyance channels).
[ ] [ ] [ ] Joints constructed by wrapping the two ends together for continuous support.
[ ] [ ] [ ] Fabric buried 6 inches minimum.
[ ] [ ] [ ] Posts are stable, fabric is tight and without rips or frayed areas.
Sediment accumulation is %of design capacity.
November 2016 Page F.7 New York State Standards and Specifications
For Erosion and Sediment Control
CONSTRUCTION DURATION INSPECTIONS Page 4 of
Sediment Control Practices (continued)
2. Storm Drain Inlet Protection (Use for Stone &Block; Filter Fabric; Curb; or, Excavated; Filter Sock or
Manufactured practices)
Yes No NA
Installed concrete blocks lengthwise so open ends face outward, not upward.
[ ] [ ] [ ] Placed wire screen between No. 3 crushed stone and concrete blocks.
Drainage area is 1 acre or less.
Excavated area is 900 cubic feet.
[ ] [ ] [ ] Excavated side slopes should be 2:1.
[ ] [ ] [ ] 2"x 4" frame is constructed and structurally sound.
[ ] [ ] [ ] Posts 3-foot maximum spacing between posts.
[ ] [ ] [ ] Fabric is embedded 1 to 1.5 feet below ground and secured to frame/posts with staples at max 8-
inch spacing.
Pasts are stable, fabric is tight and without rips or frayed areas.
[ ] [ ] [ ] Manufactured insert fabric is free of tears and punctures.
[ ] [ ] [ ] Filter Sock is not torn or flattened and fill material is contained within the mesh sock.
Sediment accumulation %of design capacity.
3. Temporary Sediment Trap
Yes No NA
[ ] [ ] [ ] Outlet structure is constructed per the approved plan or drawing.
[ ] [ ] [ ] Geotextile fabric has been placed beneath rock fill.
[ ] [ ] [ ] Sediment trap slopes and disturbed areas are stabilized.
Sediment accumulation is % of design capacity.
4. Temporary Sediment Basin
Yes No NA
[ ] [ ] [ ] Basin and outlet structure constructed per the approved plan.
[ ] [ ] [ ] Basin side slopes are stabilized with seed/mulch.
[ ] [ ] [ ] Drainage structure flushed and basin surface restored upon removal of sediment basin facility.
[ ] [ ] [ ] Sediment basin dewatering pool is dewatering at appropriate rate.
Sediment accumulation is % of design capacity.
Note: Not all erosion and sediment control practices are included in this listing. Add additional pages
to this list as required by site specific design. All practices shall be maintained in accordance
with their respective standards.
Construction inspection checklists for post-development stormwater management practices can
be found in Appendix F of the New York Stormwater Management Design Manual.
November 2016 Page F.8 New York State Standards and Specifications
For Erosion and Sediment Control
CONSTRUCTION DURATION INSPECTIONS
b. Modifications to the SWPPP (To be completed as described below)
The Operator shall amend the SWPPP whenever:
1. There is a significant change in design, construction, operation, or maintenance which may have a
significant effect on the potential for the discharge of pollutants to the waters of the United States and which
has not otherwise been addressed in the SWPPP; or
2. The SWPPP proves to be ineffective in:
a. Eliminating or significantly minimizing pollutants from sources identified in the SWPPP and as required
by this permit; or
b. Achieving the general objectives of controlling pollutants in stormwater discharges from permitted
construction activity; and
3. Additionally,the SWPPP shall be amended to identify any new contractor or subcontractor that will
implement any measure of the SWPPP.
Modification &Reason:
November 2016 Page F.9 New York State Standards and Specifications
For Erosion and Sediment Control
PACIC
CLIENT DRIVEN SOLUTIONS
APPENDIX D
LEACHING POOL INSPECTION CHECKLIST
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BOHEMIA - MANHATTAN SARATOGA SPRINGS SYRACUSE SHELTON, CT
Leaching Pool
Operation,Maintenance and Management Inspection Checklist
Project:
Location:
Site Status:
Date:
Time:
I nspector:
MAINTENANCE ITEM SATISFACTORY/ COMMENTS
UNSATISFACTORY
1.Debris Cleanout(Monthly)
Bottom clear of debris
Grate clear of debris
Connection pipes clear of debris
2.Dewatering(Monthly)
Leaching Pool dewaters between storms
3.Sediment Cleanout(Monthly)
No evidence of sedimentation in structure
Sediment accumulation does not yet require cleanout
Comments:
Actions to be Taken:
PACIC
CLIENT DRIVEN SOLUTIONS
APPENDIX E
NOI
qiilipilpl w!
111 .
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BOHEMIA - MANHATTAN SARATOGA SPRINGS SYRACUSE SHELTON, CT
0644089821
NOTICE OF INTENT
New York State Department of Environmental Conservation
Aft Division of Water
625 Broadway, 4th Floor NYREEEEEE
Albany, New York 12233-3505 (for DEC use only)
Stormwater Discharges Associated with Construction Activity Under State
Pollutant Discharge Elimination System (SPDES) General Permit # GP-0-20-001
All sections must be completed unless otherwise noted. Failure to complete all items may
result in this form being returned to you, thereby delaying your coverage under this
General Permit. Applicants must read and understand the conditions of the permit and
prepare a Stormwater Pollution Prevention Plan prior to submitting this NOI . Applicants
are responsible for identifying and obtaining other DEC permits that may be required.
- IMPORTANT-
RETURN THIS FORM TO THE ADDRESS ABOVE
OWNER/OPERATOR MUST SIGN FORM
Owner/Operator Information
Owner/Operator (Company Name/Private Owner Name/Municipality Name)
T h e E n c 1 a e s
Owner/Operator Contact Person Last Name (NOT CONSULTANT)
Owner/Operator Contact Person First Name
Owner/Operator Mailing Address
5 6 6 5 5 R o u t e 2 5
City
S o u t h o l d
State Zip
N Y 1 1 9 7 1 -
Phone (Owner/Operator) Fax (Owner/Operator)
.- - E - E E E
Email (Owner/Operator)
FED TAX ID
- (not required for individuals)
Page 1 of 14
6401089828
Project Site Information
Project/Site Name
T h e E n c l a e s
Street Address (NOT P.O. BOX)
5 6 6 5 5 R o u t e 2 5
Side of Street
® North O South O East O West
City/Town/Village (THAT ISSUES BUILDING PERMIT)
T o w n o f S o u t h o l d
State Zip County DEC Region
N Y 1 1 9 7 1 - S u f f o l k 1
Name of Nearest Cross Street
L o c u s t L a n e
Distance to Nearest Cross Street (Feet) Project In Relation to Cross Street
7 9 O North O South ® East O West
Tax Map Numbers Tax Map Numbers
Section-Block-Parcel
1 0 0 0 - 6 3 - 3 - 1 5
1. Provide the Geographic Coordinates for the project site. To do this, go to the
NYSDEC Stormwater Interactive Map on the DEC website at:
https://gisservices.dec.ny.gov/gis/stormwater/
Zoom into your Project Location such that you can accurately click on the centroid of
your site. Once you have located the centroid of your project site, go to the bottom
right hand corner of the map for the X. Y coordinates. Enter the coordinates into the
boxes below. For problems with the interactive map use the help function.
X Coordinates (Easting) Y Coordinates (Northing)
-7 2 4 1 9 4 4 1 0 6 7 2
Ex. -73.749 Ex. 42.652
2 . What is the nature of this construction project?
O New Construction
® Redevelopment with increase in impervious area
O Redevelopment with no increase in impervious area
Page 2 of 14
4107089829
3. Select the predominant land use for both pre and post development conditions.
SELECT ONLY ONE CHOICE FOR EACH
Pre-Development Post-Development
Existing Land Use Future Land Use
O FOREST O SINGLE FAMILY HOME Number of Lots
O PASTURE/OPEN LAND O SINGLE FAMILY SUBDIVISION 1
O CULTIVATED LAND O TOWN HOME RESIDENTIAL
0 SINGLE FAMILY HOME O MULTIFAMILY RESIDENTIAL
O SINGLE FAMILY SUBDIVISION O INSTITUTIONAL/SCHOOL
O TOWN HOME RESIDENTIAL O INDUSTRIAL
O MULTIFAMILY RESIDENTIAL ® COMMERCIAL
O INSTITUTIONAL/SCHOOL O MUNICIPAL
O INDUSTRIAL O ROAD/HIGHWAY
O COMMERCIAL O RECREATIONAL/SPORTS FIELD
O ROAD/HIGHWAY O BIKE PATH/TRAIL
O RECREATIONAL/SPORTS FIELD
O LINEAR UTILITY (water, sewer, gas, etc. )
O BIKE PATH/TRAIL O PARKING LOT
O LINEAR UTILITY O CLEARING/GRADING ONLY
O PARKING LOT O DEMOLITION, NO REDEVELOPMENT
O OTHER O WELL DRILLING ACTIVITY * (Oil, Gas, etc. )
O OTHER
*Note: for gas well drilling, non-high volume hydraulic fractured wells only
4. In accordance with the larger common plan of development or sale,
enter the total project site area; the total area to be disturbed;
existing impervious area to be disturbed (for redevelopment
activities) ; and the future impervious area constructed within the
disturbed area. (Round to the nearest tenth of an acre. )
Future Impervious
Total Site Total Area To Existing Impervious Area Within
Area Be Disturbed Area To Be Disturbed Disturbed Area
6 8 6 7 0 1 2 9
5. Do you plan to disturb more than 5 acres of soil at any one time? O Yes ® No
6. Indicate the percentage of each Hydrologic Soil Group (HSG) at the site.
A B C D
0 % 1 0 0 % 0 % 0 %
7. Is this a phased project? O Yes O No
Start Date End Date
8. Enter the planned start and end
dates of the disturbance 0 9 0 1 2 0 2 3
activities.
Page 3 of 14
8600089821
69. Identify the nearest surface waterbody(ies) to which construction site runoff will
discharge.
Name
S h e l t e r I s l a n d S o u n d
9a. Type of waterbody identified in Question 9?
0 Wetland / State Jurisdiction On Site (Answer 9b)
0 Wetland / State Jurisdiction Off Site
0 Wetland / Federal Jurisdiction On Site (Answer 9b)
0 Wetland / Federal Jurisdiction Off Site
0 Stream / Creek On Site
0 Stream / Creek Off Site
0 River On Site
9b. How was the wetland identified?
0 River Off Site
O Lake On Site 0 Regulatory Map
O Lake Off Site 0 Delineated by Consultant
O Other Type On Site 0 Delineated by Army Corps of Engineers
® Other Type Off Site 0 Other (identify)
B a y
10. Has the surface waterbody(ies) in question 9 been identified as a 0 Yes ® No
303 (d) segment in Appendix E of GP-0-20-001?
11. Is this project located in one of the Watersheds identified in
Appendix C of GP-0-20-001? O Yes No
12 . Is the project located in one of the watershed
areas associated with AA and AA-S classified 0 Yes 0 No
waters?
If no, skip question 13.
13. Does this construction activity disturb land with no
existing impervious cover and where the Soil Slope Phase is 0 Yes O No
identified as an E or F on the USDA Soil Survey?
If Yes, what is the acreage to be disturbed?
14 . Will the project disturb soils within a State
regulated wetland or the protected 100 foot adjacent 0 Yes 0 No
area?
Page 4 of 14
6403089820
15. Does the site runoff enter a separate storm sewer
system (including roadside drains, swales, ditches, O Yes 0 No O Unknown
culverts, etc) ?
16. What is the name of the municipality/entity that owns the separate storm sewer
system?
T o w n o f S o u t h o l d
17 . Does any runoff from the site enter a sewer classified O Yes ® No O Unknown
as a Combined Sewer?
18. Will future use of this site be an agricultural property as
defined by the NYS Agriculture and Markets Law? O Yes No
19. Is this property owned by a state authority, state agency,
federal government or local government? O Yes No
20. Is this a remediation project being done under a Department
approved work plan? (i.e. CERCLA, RCRA, Voluntary Cleanup O Yes 0 No
Agreement, etc. )
21. Has the required Erosion and Sediment Control component of the
SWPPP been developed in conformance with the current NYS 0 Yes O No
Standards and Specifications for Erosion and Sediment Control
(aka Blue Book) ?
22 . Does this construction activity require the development of a
SWPPP that includes the post-construction stormwater management
practice component (i.e. Runoff Reduction, Water Quality and ® Yes O No
Quantity Control practices/techniques) ?
If No, skip questions 23 and 27-39.
23. Has the post-construction stormwater management practice component
of the SWPPP been developed in conformance with the current NYS ® Yes O No
Stormwater Management Design Manual?
Page 5 of 14 �J
0251089825
24 . The Stormwater Pollution Prevention Plan (SWPPP) was prepared by:
0 Professional Engineer (P.E.)
O Soil and Water Conservation District (SWCD)
O Registered Landscape Architect (R.L.A)
O Certified Professional in Erosion and Sediment Control (CPESC)
O Owner/Operator
O Other
SWPPP Preparer
P W G r o s s e r Consult i n g I n c
Contact Name (Last, Space, First)
G r o g a n B r y a n
Mailing Address
6 3 0 J o h n s o n A v e n u e S u i t e 7
City
B o h em i s
State Zip
N Y 1 1 7 1 6 -
Phone Fax
6 3 1 - 5 8 9 - 6 3 5 3 - -
Email
b g r o g a n@ p w g r o s s e r c o m
SWPPP Preparer Certification
I hereby certify that the Stormwater Pollution Prevention Plan (SWPPP) for
this project has been prepared in accordance with the terms and conditions of
the GP-0-20-001 . Furthermore, I understand that certifying false, incorrect
or inaccurate information is a violation of this permit and the laws of the
State of New York and could subject me to criminal, civil and/or
administrative proceedings.
First Name MI
B r y a n A
Last Name
G r o g a n
Signature
Date
Eo 9 1
� 0 6 2 0 2 3
Page 6 of 14
0005089822
25. Has a construction sequence schedule for the planned management
practices been prepared? 4 Yes O No
26. Select all of the erosion and sediment control practices that will be
employed on the project site:
Temporary Structural Vegetative Measures
O Check Dams O Brush Matting
O Construction Road Stabilization O Dune Stabilization
0 Dust Control O Grassed Waterway
O Earth Dike O Mulching
O Level Spreader O Protecting Vegetation
O Perimeter Dike/Swale O Recreation Area Improvement
O Pipe Slope Drain 0 Seeding
O Portable Sediment Tank O Sodding
O Rock Dam O Straw/Hay Bale Dike
O Sediment Basin O Streambank Protection
O Sediment Traps O Temporary Swale
0 Silt Fence 0 Topsoiling
Stabilized Construction Entrance O Vegetating Waterways
� Storm Drain Inlet Protection
Permanent Structural
O Straw/Hay Bale Dike
O Temporary Access Waterway Crossing O Debris Basin
O Temporary Stormdrain Diversion O Diversion
O Temporary Swale O Grade Stabilization Structure
O Turbidity Curtain O Land Grading
O Water bars O Lined Waterway (Rock)
O Paved Channel (Concrete)
Biotechnical O Paved Flume
O Brush Matting O Retaining Wall
O Wattling O Riprap Slope Protection
O Rock Outlet Protection
Other O Streambank Protection
Page 7 of 14
0182089828
Post-construction Stormwater Management Practice (SMP) Requirements
Important: Completion of Questions 27-39 is not required
if response to Question 22 is No.
27. Identify all site planning practices that were used to prepare the final site
plan/layout for the project.
O Preservation of Undisturbed Areas
4 Preservation of Buffers
O Reduction of Clearing and Grading
O Locating Development in Less Sensitive Areas
O Roadway Reduction
O Sidewalk Reduction
O Driveway Reduction
O Cul-de-sac Reduction
O Building Footprint Reduction
O Parking Reduction
27a. Indicate which of the following soil restoration criteria was used to address the
requirements in Section 5.1. 6 ("Soil Restoration") of the Design Manual
(2010 version) .
4 All disturbed areas will be restored in accordance with the Soil
Restoration requirements in Table 5.3 of the Design Manual (see page 5-22) .
O Compacted areas were considered as impervious cover when calculating the
WQv Required, and the compacted areas were assigned a post-construction
Hydrologic Soil Group (HSG) designation that is one level less permeable
than existing conditions for the hydrology analysis .
28. Provide the total Water Quality Volume (WQv) required for this project (based on
final site plan/layout) .
Total WQv Required
0 , 7 1 acre-feet
29. Identify the RR techniques (Area Reduction) , RR techniques (Volume Reduction) and
Standard SMPs with RRv Capacity in Table 1 (See Page 9) that were used to reduce
the Total WQv Required(#2 8) .
Also, provide in Table 1 the total impervious area that contributes runoff to each
technique/practice selected. For the Area Reduction Techniques, provide the total
contributing area (includes pervious area) and, if applicable, the total impervious
area that contributes runoff to the technique/practice.
Note: Redevelopment projects shall use Tables 1 and 2 to identify the SMPs used
to treat and/or reduce the WQv required. If runoff reduction techniques will not
be used to reduce the required WQv, skip to question 33a after identifying the
SMPs.
Page 8 of 14 �J
7738089822 Table 1 - Runoff Reduction (RR) Techniques
and Standard Stormwater Management
Practices (SMPs)
Total Contributing Total Contributing
RR Techniques (Area Reduction) Area (acres) Impervious Area(acres)
O Conservation of Natural Areas (RR-1) . . . and/or •
O Sheetflow to Riparian
Buffers/Filters Strips (RR-2) . . . . . . . . . . and/or •
O Tree Planting/Tree Pit (RR-3) . . . . . . . . . . and/or
O Disconnection of Rooftop Runoff (RR-4) . . and/or •
RR Techniques (Volume Reduction)
O Vegetated Swale (RR-5)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Rain Garden (RR-6) '
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Stormwater Planter (RR-7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •
O Rain Barrel/Cistern (RR-8) •
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Porous Pavement (RR-9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . • • • • • . . . •
O Green Roof (RR-10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •
Standard SMPs with RRv Capacity
O Infiltration Trench (I-1)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Infiltration Basin (I-2) . . . . . . . . • • • . . - -
. . . . . . . . . . . . . . . . . . . • • • -
® Dr Well I-3 2 8 9
O Underground Infiltration System (I-4)
. . . . . . . . . . . . . . . . . . . . . . . .
O Bioretention (F-5)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Dry Swale (0-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •
Standard SMPs
O Micropool Extended Detention (P-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Wet Pond (P-2)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Wet Extended Detention (P-3)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Multiple Pond System (P-4) . . . . . . . . . . . . . . . . . . • • • • • • . . . . . . . . .
• • • '
O Pocket Pond (P-5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Surface Sand Filter (F-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •
O Underground Sand Filter (F-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •
O Perimeter Sand Filter (F-3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •
O Organic Filter (F-4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Shallow Wetland (W-1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Extended Detention Wetland (W-2) .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Pond/Wetland System (W-3) •
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Pocket Wetland (W-4)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Wet Swale (0-2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •
Page 9 of 14
0762089822
Table 2 - Alternative SMPs
(DO NOT INCLUDE PRACTICES BEING
USED FOR PRETREATMENT ONLY)
Total Contributing
Alternative SMP Impervious Area(acres)
O Hydrodynamic •
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Wet Vault •
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Media Filter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O Other
Provide the name and manufacturer of the Alternative SMPs (i.e.
proprietary practice (s) ) being used for WQv treatment.
Name
Manufacturer
Note: Redevelopment projects which do not use RR techniques, shall
use questions 28, 29, 33 and 33a to provide SMPs used, total
WQv required and total WQv provided for the project.
30. Indicate the Total RRv provided by the RR techniques (Area/Volume Reduction) and
Standard SMPs with RRv capacity identified in question 29.
Total RRv provided
E• acre-feet
31. Is the Total RRv provided (#30) greater than or equal to the
total WQv required (#2 8) .
O Yes ® No
If Yes, go to question 36.
If No, go to question 32.
32. Provide the Minimum RRv required based on HSG.
[Minimum RRv Required = (P) (0. 95) (Ai) /12, Ai=(S) (Aic) ]
Minimum RRv Required
•E acre-feet
32a. Is the Total RRv provided (#30) greater than or equal to the
Minimum RRv Required (#32) ? O Yes O No
If Yes, go to question 33.
Note: Use the space provided in question #39 to summarize the
specific site limitations and justification for not reducing
100 0 of WQv required (#28) . A detailed evaluation of the
specific site limitations and justification for not reducing
1000 of the WQv required (#28) must also be included in the
SWPPP.
If No, sizing criteria has not been met, so NOI can not be
processed. SWPPP preparer must modify design to meet sizing
criteria.
Page 10 of 14
1766089827
33. Identify the Standard SMPs in Table 1 and, if applicable, the Alternative SMPs in
Table 2 that were used to treat the remaining
total WQv(=Total WQv Required in 28 - Total RRv Provided in 30) .
Also, provide in Table 1 and 2 the total impervious area that contributes runoff
to each practice selected.
Note: Use Tables 1 and 2 to identify the SMPs used on Redevelopment projects.
33a. Indicate the Total WQv provided (i.e. WQv treated) by the SMPs
identified in question #33 and Standard SMPs with RRv Capacity identified
in question 29.
WQv Provided
1 E 7 6 acre-feet
Note: For the standard SMPs with RRv capacity, the WQv provided by each practice
the WQv calculated using the contributing drainage area to the practice
RRv provided by the practice. (See Table 3.5 in Design Manual)
34. Provide the sum of the Total RRv provided (#30) and 1 E 7 6
the WQv provided (#33a) . •
35. Is the sum of the RRv provided (#30) and the WQv provided
(#33a) greater than or equal to the total WQv required (#2 8) ? 0 Yes O No
If Yes, go to question 36.
If No, sizing criteria has not been met, so NOI can not be
processed. SWPPP preparer must modify design to meet sizing
criteria.
36. Provide the total Channel Protection Storage Volume (CPv) required and
provided or select waiver (36a) , if applicable.
CPv Required CPv Provided
• acre-feet acre-feet
36a. The need to provide channel protection has been waived because:
O Site discharges directly to tidal waters
or a fifth order or larger stream.
® Reduction of the total CPv is achieved on site
through runoff reduction techniques or infiltration systems.
37. Provide the Overbank Flood (Qp) and Extreme Flood (Qf) control criteria or
select waiver (37a) , if applicable.
Total Overbank Flood Control Criteria (Qp)
Pre-Development Post-development
7 0 8 CFS 4 7 6 CFS
Total Extreme Flood Control Criteria (Qf)
Pre-Development Post-development
1 7 0 4 CFS 1 4 4 5 CFS
Page 11 of 14
1310089822
37a. The need to meet the Qp and Qf criteria has been waived because:
O Site discharges directly to tidal waters
or a fifth order or larger stream.
O Downstream analysis reveals that the Qp and Qf
controls are not required
38. Has a long term Operation and Maintenance Plan for the
post-construction stormwater management practice (s) been 0 Yes O No
developed?
If Yes, Identify the entity responsible for the long term
Operation and Maintenance
T h e E n c l a v e s
39. Use this space to summarize the specific site limitations and justification
for not reducing 100 o of WQv required(#28) . (See question 32a)
This space can also be used for other pertinent project information.
Page 12 of 14
4285089826
40. Identify other DEC permits, existing and new, that are required for this
project/facility.
0 Air Pollution Control
0 Coastal Erosion
0 Hazardous Waste
0 Long Island Wells
0 Mined Land Reclamation
0 Solid Waste
O Navigable Waters Protection / Article 15
0 Water Quality Certificate
0 Dam Safety
0 Water Supply
0 Freshwater Wetlands/Article 24
0 Tidal Wetlands
0 Wild, Scenic and Recreational Rivers
0 Stream Bed or Bank Protection / Article 15
0 Endangered or Threatened Species (Incidental Take Permit)
0 Individual SPDES
0 SPDES Multi-Sector GP N Y R
0 Other
® None
41. Does this project require a US Army Corps of Engineers
Wetland Permit? O Yes No
If Yes, Indicate Size of Impact.
42 . Is this project subject to the requirements of a regulated,
traditional land use control MS4? Yes 0 No
(If No, skip question 43)
43. Has the "MS4 SWPPP Acceptance" form been signed by the principal
executive officer or ranking elected official and submitted along O Yes O No
with this NOI?
44 . If this NOI is being submitted for the purpose of continuing or transferring
coverage under a general permit for stormwater runoff from construction
activities, please indicate the former SPDES number assigned. N Y R
Page 13 of 14
3547089826
Owner/Operator Certification
I have read or been advised of the permit conditions and believe that I understand them. I also
understand that, under the terms of the permit, there may be reporting requirements. I hereby certify
that this document and the corresponding documents were prepared under my direction or supervision. I am
aware that there are significant penalties for submitting false information, including the possibility of
fine and imprisonment for knowing violations. I further understand that coverage under the general permit
will be identified in the acknowledgment that I will receive as a result of submitting this NOI and can
be as long as sixty (60) business days as provided for in the general permit. I also understand that, by
submitting this NOI, I am acknowledging that the SWPPP has been developed and will be implemented as the
first element of construction, and agreeing to comply with all the terms and conditions of the general
permit for which this NOI is being submitted.
Print First Name MI
Print Last Name
Owner/Operator Signature
Date
Page 14 of 14
PACIC
CLIENT DRIVEN SOLUTIONS
APPENDIX F
WATER QUALITY VOLUME CALCULATIONS
P.W.GROSSER CONSULTING,INC•P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
631.589.6353•WWWPWGROSSER.COM•PWGC.INFO@PWGROSSER.COM
BOHEMIA - MANHATTAN SARATOGA SPRINGS SYRACUSE SHELTON, CT
Appendix G
Water Quality Volume Calculations
Drainage Area A
Project:AVG 1803
Water Quality Volume Calculations(WQv)
Drainage Area A
Total Contributory Area(acres) 1.95
Existing Impervious Area(acres) 0.00
Post-Development Impervious Area(acres) 0.74
Increase in Impervious Area(acres) 0.74
New Construction Project with Redevelopment Areas
Total Contributory Area,A(acres) 1.95
Impervious Cover,I=(25%*Existing Imp.Area+100%*New Imp.Area)/Contributory Area*100 37.95
Volumetric Runoff Coefficient,Rv=0.05+0.009(1%) 0.39
290%Rainfall Event,P(inches) 1.50
Water Quality Volume,WQV(acre-ft)=(Rv*P*A)/(12"/ft) 0.10
Total Treatment with100%Pretreatment
`WQVT(acre-ft)=WQv+100%WQV(Required due to soil infiltration rate>5in/hr) 0.191
WQVT(ft')(Required) 8,315
Drainage Area A
Number of Leaching Pools Type 1(12'Dia.12'Effective Depth) 7
Outside Diameter of Leaching Pool 12.00
Capacity of Leaching Pools(ft3/vertical foot) 100.88
Provided Vertical Feet 12.00
Total Pretreatment and Treatment WQV Provided(ft3) 8,473.92
Number of Leaching Pools Type 2(12'Dia.13'Effective Depth) 4
Outside Diameter of Leaching Pool 12.00
Capacity of Leaching Pools(ft3/vertical foot) 100.88
Provided Vertical Feet 13.00
Total Pretreatment and Treatment WQV Provided(ft3) 5,245.76
Total Pretreatment and Treatment WQV Provided(ft3) 13,719.68
Total Pretreatment and Treatment WQV Provided(acre-ft] 0.315
0.315 Acre ft>0.191 acre ft; OK
48-Hour Dewatering Calculations
Drainage Area A
Leaching Floor Area Per Drywell Type 1(ft) 100.88
Total Area(ft) 706.16
Leaching Floor Area Per Drywell Type 2(ft) 100.88
Total Area(ft) 403.52
Total Combined Area(ft2) 1,109.68
1Soil Permeability,SP(in/hr) 5.00
Soil Permeability,SP(ft/hr) 0.42
Infiltration Rate(ft3/hr) 462.37
Infiltration Rate(ft3/s) 0.13
Total Water Quality Volume,WQVT W) 8,314.52
Dewatering Time(hr)=WQVT/(A*SP) 17.98
17.98 hrs 5 48 hrs; OK
1.United States Department of Agriculture.Natural Resources Conservation Service.Custom Soil Resource Report for Suffolk County,New York.Accessed online on April 20,2023.
2.New York State Department of Environmental Conservation.Stormwater Management Design Manual.January 2015.
1of8
Appendix G
Water Quality Volume Calculations
Drainage Area B
Project:AVG 1803
Water Quality Volume Calculations(WQv)
Drainage Area B
Total Contributory Area(acres) 2.32
Existing Impervious Area(acres) 0.00
Post-Development Impervious Area(acres) 1.30
Increase in Impervious Area(acres) 1.30
New Construction Project with Redevelopment Areas
Total Contributory Area,A(acres) 2.32
Impervious Cover,I=(25%*Existing Imp.Area+100%*New Imp.Area)/Contributory Area*100 56.03
Volumetric Runoff Coefficient,Rv=0.05+0.009(1%) 0.55
290%Rainfall Event,P(inches) 1.50
Water Quality Volume,WQV(acre-ft)=(Rv*P*A)/(12"/ft) 0.16
Total Treatment with 100%Pretreatment
`WQVT(acre-ft)=WQv+100%WQV(Required due to soil infiltration rate>5in/hr) 0.322
WQVT(ft')(Required) 14,005
Drainage Area B
Number of Leaching Pools Type 1(12'Dia.14'Effective Depth) 14
Outside Diameter of Leaching Pool 12.00
Capacity of Leaching Pools(ft3/vertical foot) 100.88
Provided Vertical Feet 14.00
Total Pretreatment and Treatment WQV Provided(ft3) 19,772.48
Total Pretreatment and Treatment WQV Provided(ft3) 19,772.48
Total Pretreatment and Treatment WQV Provided(acre-ft] 0.454
0.454 Acre ft>0.322 acre ft; OK
48-Hour Dewatering Calculations
Drainage Area B
Leaching Floor Area Per Drywell Type 1(ft) 100.88
Total Area(ft) 1.1412.32
Total Combined Area(ft2) 1,412.32
1Soil Permeability,SP(in/hr) 5.00
Soil Permeability,SP(ft/hr) 0.42
Infiltration Rate(ft3/hr) 588
Infiltration Rate(ft3/s) 0.163
Total Water Quality Volume,WQVT W) 14,005
Dewatering Time(hr)=WQVT/(A*SP) 23.80
23.80 hrs_<48 hrs; OK
1.United States Department of Agriculture.Natural Resources Conservation Service.Custom Soil Resource Report for Suffolk County,New York.Accessed online on April 20,2023.
2.New York State Department of Environmental Conservation.Stormwater Management Design Manual.January 2015.
2of4
Appendix G
Water Quality Volume Calculations
Drainage Area C
Project:AVG 1803
Water Quality Volume Calculations(WQv)
Drainage Area C
Total Contributory Area(acres) 1.54
Existing Impervious Area(acres) 0.00
Post-Development Impervious Area(acres) 0.40
Increase in Impervious Area(acres) 0.40
New Construction Project with Redevelopment Areas
Total Contributory Area,A(acres) 1.54
Impervious Cover,I=(25%*Existing Imp.Area+100%*New Imp.Area)/Contributory Area*100 25.97
Volumetric Runoff Coefficient,Rv=0.05+0.009(1%) 0.28
290%Rainfall Event,P(inches) 1.50
Water Quality Volume,WQV(acre-ft)=(Rv*P*A)/(12"/ft) 0.05
Total Treatment with 100%Pretreatment
`WQVT(acre-ft)=WQv+100%WQV(Required due to soil infiltration rate>5in/hr) 0.109
WQVT(ft')(Required) 41-759
Drainage Area C
Number of Leaching Pools Type 1(12'Dia.14'Effective Depth) 6
Outside Diameter of Leaching Pool 12.00
Capacity of Leaching Pools(ft3/vertical foot) 100.88
Provided Vertical Feet 14.00
Total Pretreatment and Treatment WQV Provided(ft3) 8,473.92
Number of Leaching Pools Type 2(12'Dia.13'Effective Depth) 2
Outside Diameter of Leaching Pool 12.00
Capacity of Leaching Pools(ft3/vertical foot) 100.88
Provided Vertical Feet 13.00
Total Pretreatment and Treatment WQV Provided(ft3) 2,622.88
Total Pretreatment and Treatment WQV Provided(ft3) 11,096.80
Total Pretreatment and Treatment WQV Provided(acre-ft] 0.255
0.255 Acre ft>0.109 acre ft; OK
48-Hour Dewatering Calculations
Drainage Area C
Leaching Floor Area Per Drywell(ft) 100.88
Total Area(ft) 605.28
Leaching Floor Area Per Drywell(ft) 100.88
Total Area(ft) 201.76
Total Combined Area(ft2) 807.04
1Soil Permeability,SP(in/hr) 5.00
Soil Permeability,SP(ft/hr) 0.42
Infiltration Rate(ft3/hr) 336.27
Infiltration Rate(ft3/s) 0.09
Total Water Quality Volume,WQVT W) 4758.93
Dewatering Time(hr)=WQVT/(A*SP) 14.15
14.15 hrs 5 48 hrs; OK
1.United States Department of Agriculture.Natural Resources Conservation Service.Custom Soil Resource Report for Suffolk County,New York.Accessed online on April 20,2023.
2.New York State Department of Environmental Conservation.Stormwater Management Design Manual.January 2015.Chapter 4
3of4
Appendix G
Water Quality Volume Calculations
Drainage Area D
Project:AVG 1803
Water Quality Volume Calculations(WQv)
Drainage Area D
Total Contributory Area(acres) 0.94
Existing Impervious Area(acres) 0.15
Post-Development Impervious Area(acres) 0.45
Increase in Impervious Area(acres) 0.30
New Construction Project with Redevelopment Areas
Total Contributory Area,A(acres) 0.94
Impervious Cover,I=(25%*Existing Imp.Area+100%*New Imp.Area)/Contributory Area*100 35.90
Volumetric Runoff Coefficient,Rv=0.05+0.009(1%) 0.37
290%Rainfall Event,P(inches) 1.50
Water Quality Volume,WQV(acre-ft)=(Rv*P*A)/(12"/ft) 0.04
Total Treatment with 100%Pretreatment
2WQVT(acre-ft)=WQv+100%WQV(Required due to soil infiltration rate>5in/hr) 0.088
WQVT W)(Required) 3,820
Drainage Area D
Number of Leaching Pools Type 1(12'Dia.12'Effective Depth) 5
Outside Diameter of Leaching Pool 12.00
Capacity of Leaching Pools(ft3/vertical foot) 100.88
Provided Vertical Feet 12.00
Total Pretreatment and Treatment WQV Provided(ft3) 6,052.80
Number of Leaching Pools Type 2(10'Dia.10'Effective Depth) 1
Outside Diameter of Leaching Pool 10.00
Capacity of Leaching Pools(ft3/vertical foot) 68.42
Provided Vertical Feet 10.00
Total Pretreatment and Treatment WQV Provided(ft3) 684.20
Total Pretreatment and Treatment WQV Provided(ft3) 6,737.00
Total Pretreatment and Treatment WQV Provided(acre-ft] 0.155
0.155 Acre ft>0.088 acre ft; OK
48-Hour Dewatering Calculations
Drainage Area B
Leaching Floor Area Per Drywell(ft) 100.88
Total Area(ft) 504.40
Leaching Floor Area Per Drywell(ft) 68.42
Total Area(ft) 68.42
Total Combined Area(ft2) 572.82
1Soil Permeability,SP(in/hr) 5.00
Soil Permeability,SP(ft/hr) 0.42
Infiltration Rate(ft3/hr) 239
Infiltration Rate(ft3/s) 0.066
Total Water Quality Volume,WQVT(ft3) 3,820
Dewatering Time(hr)=WQVT/(A*SP) 16.00
116 hrs_<48 hrs; OK
1.United States Department of Agriculture.Natural Resources Conservation Service.Custom Soil Resource Report for Suffolk County,New York.Accessed online on April 20,2023.
2.New York State Department of Environmental Conservation.Stormwater Management Design Manual.January 2015
4of4
PACIC
CLIENT DRIVEN SOLUTIONS
APPENDIX G
WATER QUANTITY VOLUME CALCULATIONS
P.W.GROSSER CONSULTING,INC•P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
631.589.6353•WWWPWGROSSER.COM•PWGC.INFO@PWGROSSER.COM
BOHEMIA - MANHATTAN SARATOGA SPRINGS SYRACUSE SHELTON, CT
PACIC
CLIENT DRIVEN SOLUTIONS
AREAA
P.W.GROSSER CONSULTING,INC•P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
631.589.6353 •WWW.PWGROSSER.COM•PWGC.INFO@a PWGROSSER.COM
BOHEMIA • MANHATTAN • SARATOGA SPRINGS • SYRACUSE • SHELTON, CT
Appendix H
Water Quantity Volume Calculations
Drainage Area A
Project:AVG1803
Location:56655 Route 25,Southold,NY 11971
Condition:Pre-Developed-Drainage Area A
Runoff Curve Number
Soil Name&Hydrologic Group
Cover Description 1 Curve Number Area(AC) Area(%) Product of CN x
Soil Classification HSG(HYDROLOGIC (CN) Area
SOIL GROUP)
Riverhead Sandy Loam(HaA) B Woods,Fair Condition 60 1.95 100% 60.00
Totals=1 1.95 1 100% 60.00
CN(weighted)=total product/total area= 60.00 Use CN 41 60
Runoff
Storm#1 Storm#2 Storm#3
Frequency(yr) 1 10 100
$Rainfall,P(24-hour) 2.84 5.44 8.54
S=1000/CN-10 6.67 6.67 6.67
Runoff,Q(in)=(P-0.2S)2/(P+0.8S) 0.28 1.57 3.74
Time of Concentration(T J
Sheet Flow Storm#1 Storm#2 Storm#3
Segment ID 1a 1b 1a 1b 1a 1b
Z Surface Description Woods Grass Woods Grass Woods Grass
Z Manning's Roughness coefficient(Weighted),n 0.40 0.15 0.40 0.15 0.40 0.15
3 Flow Length,L 75 75 75 75 75 75
8Rainfall,P(2-Yr,24-Hr) 3.490 3.490 3.490 3.490 3.490 3.490
3 Land slope,s 0.015 0.015 0.015 0.015 0.015 0.015
Tt(Sheet Flow)=(0.007*(n*L)o.$)/(PO.s*so.4) 0.31 0.14 0.31 0.14 0.31 0.14
Total Tt(Sheet Flow)= 0.44 0.44 0.44
Shallow Concentrated Flow Storm#1 Storm#2 Storm#3
Segment ID 1a 1a 1a
Surface Description Unpaved Unpaved Unpaved
3 Flow Length,L 115 115 115
3 Watercourse slope,s 0.015 0.015 0.015
4 Average velocity,V 2.00 2.00 2.00
Tt(Shallow Concentrated Flow)=L/(3600*V) 0.02 0.02 0.02
Total Tt(Shallow Concentrated Flow)= 0.02 0.02 0.02
Watershed Tc(hr)=Tt_sc+Total Tt_scF 0.46 0.46 0.46
Graphical Peak Discharge Method
Storm#1 Storm#2 Storm#3
Drainage Area,Am(mil) 0.0030 0.0030 0.0030
Runoff Curve Number,CN 60 60 60
Time of Concentration,Tc(hr) 0.46 0.46 0.46
Rainfall Distribution(TYPE III-Atlantic Coastal Areas) III III III
Pond and Swamp area spread throughout watershed 0 0 0
Frequency(yr) 1 10 100
Rainfall,P(24-hour) 2.84 5.44 8.54
5 Initial abstraction,la(in) 1.333 1.333 1.333
Compute la/P 0.47 0.25 0.16
6 Unit peak discharge,qu(csm/in) 220 380 390
Runoff,Q(in) 0.278 1.57 3.74
Pond and Swamp adjustment factor,Fp 1 1 1
Peak discharge,qp(ft3/s)=qu*Am*Q*FP 0.19 1.81 4.45
1 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 2-2,page 2-5&2-7
Z United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 3-1,page 3-3
3 Refer to the attached FIGURE-1&2 for Pre and Post-Development Flow Lengths
4 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Figure 3-1,page 3-2
5 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 4-1,page 4-1
6 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Exhibit 4-III,page 4-7
United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 4-2,page 4-2
8 NOAA Atlas 14,Volume 10,Version 3.Point Precipitation Frequency(PF)Estimates With 90%Confidence Intervals and Supplementary Information
1of3
Appendix H
Water Quantity Volume Calculations
Drainage Area A
Project:AVG1803
Location:56655 Route 25,Southold,NY 11971
Condition:Post-Developed-Drainage Area A
Runoff Curve Number
Soil Name&Hydrologic Group
Cover Description 1 Curve Number Area(AC) Area(%) Product of CN x
Soil Classification HSG(HYDROLOGIC (CN) Area
SOIL GROUP)
Riverhead Sandy Loam(HaA) B Impervious Area 98 0.74 38% 37.19
Riverhead Sandy Loam(HaA) B Open space,Fair Condition 69 1.21 62% 42.82
Totals=1 1.95 100% 80.01
CN(weighted)=total product/total area= 80.01 Use CN 4180
Runoff
Storm#1 Storm#2 Storm#3
Frequency(yr) 1 10 100
8Rainfall,P(24-hour) 2.84 5.44 8.54
S=1000/CN-10 2.50 2.50 2.50
Runoff,Q(in)=(P-0.2S)2/(P+0.8S) 1.13 3.28 6.13
Time of Concentration(TJ
Sheet Flow Storm#1 Storm#2 Storm#3
Segment ID 1a 1a 1a
Z Surface Description Grass Grass Grass
Z Manning's Roughness coefficient(Weighted),n 0.15 0.15 0.15
3 Flow Length,L 100 100 100
8Rainfall,P(2-Yr,24-Hr) 3.490 3.490 3.490
3Land slope,s 0.015 0.015 0.015
Tt(SheetFlow)=(0.007*(n*LY.8)/(P0.5*s°.4) 0.18 0.18 0.18
Total Tt(Sheet Flow)= 0.18 0.18 0.18
Shallow Concentrated Flow Storm#1 Storm#2 Storm#3
Segment ID 2a 2b 2a 2b 2a 2b
Surface Description Unpaved Paved Unpaved Paved Unpaved Paved
3 Flow Length,L 95 176 95 176 95 176
3 Watercourse slope,s 0.010 0.010 0.010 0.010 0.010 0.010
4 Average velocity,V 1.60 2.05 1.60 2.05 1.60 2.05
Tt(Shallow Concentrated Flow)=L/(3600*V) 0.02 0.02 0.02 0.02 0.02 0.02
Total Tt(ShallowConcentrated Flow)= 0.04 0.04 0.04
Watershed I c(h r =I t-sc+Tota I Tt-SCF 0.22 0.22 0.22
Graphical Peak Discharge Method
Storm#1 Storm#2 Storm#3
Drainage Area,Am(miz) 0.0030 0.0030 0.0030
Runoff Curve Number,CN 80 80 80
Time of Concentration,T,(hr) 0.22 0.22 0.22
Rainfall Distribution(TYPE III-Atlantic Coastal Areas) III III III
Pond and Swamp area spread throughout watershed 0 0 0
Frequency(yr) 1 10 100
Rainfall,P(24-hour) 2.84 5.44 8.54
5 Initial abstraction,la(in) 0.500 0.500 0.500
Compute la/P 0.18 0.09 Use 0.10 0.06 Use 0.10
6 Unit peak discharge,qu(csm/in) 505 540 540
Runoff,Q(in) 1.132 3.28 6.13
Pond and Swamp adjustment factor,Fp 1 1 1
Peak discharge,qp(ft3/s)=qu*Am*Q*Fp 1.74 5.40 10.09
1 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 2-2,page 2-5&2-7
2 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 3-1,page 3-3
3 Refer to the attached FIGURE-1&2 for Pre and Post-Development Flow Lengths
4 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Figure 3-1,page 3-2
5 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 4-1,page 4-1
6 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Exhibit 4-III,page 4-7
United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 4-2,page 4-2
8 NOAA Atlas 14, Volume 10,Version 3.Point Precipitation Frequency(PF)Estimates With 90%Confidence Intervals and Supplementary Information
1of3
Appendix H
Water Quantity Volume Calculations
Drainage Area A
Project:AVG1803
Location:56655 Route 25,Southold, NY 11971
Runoff Reduction(RRv)
RRv=Reduction of the total WQv by application of green infrastructure techniques and SMPs to replicate
pre-development hydrology.
WQ= 0.19 acre-ft
100%WQV= 0.19 acre-ft
1-100%of the RRv will be provided by Infiltration Practices
Vs= 0.31 acre-ft provided
Channel Protection Volume(Cps,)-1-year,24-hour storm event(see note below)
Runoff Curve Number,CN
Initial abstraction,la(in)
Time of Concentration,Tc(hr)
6 Unit peak discharge,qu(csm/in)-1-year,24-hr Storm Event of the post development
8 Peak Outflow Discharge/Peak Inflow Discharge(qo/qi)
gVs/Vr=0.682-1.43(go/qi)+1.64(go/gi)2-0.804(go/qi)3
Runoff,Qd(in)
Total Drainage Area(acres)
CpV=VS=(VS/VMQ)(A)/12(acre-ft)
CpV=ft 3
Average Release Rate= Not required for Infiltration Practices or Tidal Discharge
Note: Cpv requirements do not apply when the reduction of the entire Cpv volume is achieved through an infiltration system
or if the site discharges directly to tidal waters.
Overbank Flood Protection Volume(Qpjo)-10-year,24-hour storm
Post-Developed Peak Flow,qi(ft3/s) 5.40
Pre-Developed Peak Flow(Peak Inflow Discharge),qo(ft3/s) 1.81
Storage Volume,Vs=Qp-10(acre-ft) 0.31
Runoff,Q(in) 3.28
Runoff Volume,Vr(acre-ft)=(Q/12)*A 0.53
VS/Vr 0.591
8qo/qi 0.230
Peak Outflow Discharge,Qp10,(cfs)=qi*(q0/qi) 1.24
Post-Development Peak Discharge 1.24 cfs< Pre-Development Peak Discharge 1.81 cfs; OK
Extreme Flood Protection Volume(04)100-year,24-hour storm
Post-Developed Peak Flow,qi(ft3/s) 10.09
Pre-Developed Peak Flow(Peak Inflow Discharge),qo(ft3/s) 4.45
Storage Volume,Vs=Qp-10(acre-ft) 0.31
Runoff,Q(in) 6.13
Runoff Volume,Vr(acre-ft)=(Q/12)*A 1.00
VS/Vr 0.316
Z5go/qi 0.420
Peak Outflow Discharge,Qf100,(cfs)=qi*(q0/qi) 4.24
Post-Development Peak Discharge 4.24 cfs< Pre-Development Peak Discharge 4.45 cfs; OK
8 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Figure 6-1,page 6-2
3of3
Chapter 2 Estimating Runoff Technical Release 55
Urban Hydrology for Small Watersheds
Table 2-2a Runoff curve numbers for urban areas 1/
Curve numbers for
------------------------------------------- Cover description ----------------------------------------- -----------hydrologic soil group-------------
Average percent
Cover type and hydrologic condition impervious area 2/ A B C D
Fully developed urban areas (vegetation established)
Open space(lawns,parks,golf courses,cemeteries,etc.)3/:
Poor condition(grass cover<50%).......................................... 68 86 89
Fair condition(grass cover 50%to 759/6) .................................. 49 79 84
69
Good condition(grass cover>75%)......................................... 39 74 80
Impervious areas:
Paved parking lots,roofs,driveways,etc.
(excluding right-of-way)............................................................. 98 98 98 98
Streets and roads:
Paved;curbs and storm sewers(excluding
right-of-way) ................................................................................ 98 98 98 98
Paved;open ditches(including right-of-way).......................... 83 89 92 93
Gravel(including right-of-way)................................................. 76 85 89 91
Dirt(including right-of-way)...................................................... 72 82 87 89
Western desert urban areas:
Natural desert landscaping(pervious areas only) 4i..................... 63 77 85 88
Artificial desert landscaping(impervious weed barrier,
desert shrub with 1-to 2-inch sand or gravel mulch
and basin borders) ...................................................................... 96 96 96 96
Urban districts:
Commercial and business................................................................. 85 89 92 94 95
Industrial............................................................................................. 72 81 88 91 93
Residential districts by average lot size:
1/8 acre or less(town houses).......................................................... 65 77 85 90 92
1/4 acre ................................................................................................ 38 61 75 83 87
1/3 acre ................................................................................................ 30 57 72 81 86
1/2 acre ................................................................................................ 25 54 70 80 85
1 acre ................................................................................................... 20 51 68 79 84
2 acres.................................................................................................. 12 46 65 77 82
Developing urban areas
Newly graded areas
(pervious areas only,no vegetation)5/................................................................ 77 86 91 94
Idle lands(CN's are determined using cover types
similar to those in table 2-2c).
1 Average runoff condition,and Ia=0.2S.
2 The average percent impervious area shown was used to develop the composite CN's.Other assumptions are as follows:impervious areas are
directly connected to the drainage system,impervious areas have a CN of 98,and pervious areas are considered equivalent to open space in
good hydrologic condition.CN's for other combinations of conditions may be computed using figure 2-3 or 2-4.
3 CN's shown are equivalent to those of pasture.Composite CN's may be computed for other combinations of open space
cover type.
4 Composite CN's for natural desert landscaping should be computed using figures 2-3 or 2-4 based on the impervious area percentage
(CN=98)and the pervious area CN.The pervious area CN's are assumed equivalent to desert shrub in poor hydrologic condition.
5 Composite CN's to use for the design of temporary measures during grading and construction should be computed using figure 2-3 or 2-4
based on the degree of development(impervious area percentage)and the CN's for the newly graded pervious areas.
(210-VI-TR-55,Second Ed.,June 1986) 2-5
Chapter 2 Estimating Runoff Technical Release 55
Urban Hydrology for Small Watersheds
Table 2-2c Runoff curve numbers for other agricultural lands li
Curve numbers for
--------------------------------------- Cover description -------------------------------------- - hydrologic soil group
----------- ---------------
Hydrologic
Cover type condition A B C D
Pasture,grassland,or range—continuous Poor 68 79 86 89
forage for grazing.2/ Fair 49 69 79 84
Good 39 61 74 80
Meadow—continuous grass,protected from — 30 58 71 78
grazing and generally mowed for hay.
Brush—brush-weed-grass mixture with brush Poor 48 67 77 83
the major element.3i Fair 35 56 70 77
Good 30 4/ 48 65 73
Woods—grass combination(orchard Poor 57 73 82 86
or tree farm).Ji Fair 43 65 76 82
Good 32 58 72 79
Woods.6/ Poor 45 77 83
Fair 36 60 73 79
Good 30 4/ 70 77
Farmsteads—buildings,lanes,driveways, — 59 74 82 86
and surrounding lots.
1 Average runoff condition,and Ia=0.25.
2 Poor: <50%)ground cover or heavily grazed with no mulch.
Fair: 50 to 75%ground cover and not heavily grazed.
Good.• >75%ground cover and lightly or only occasionally grazed.
3 Poor. <50%ground cover.
Fair: 50 to 75%ground cover.
Good.• >75%ground cover.
4 Actual curve number is less than 30;use CN=30 for runoff computations.
5 CN's shown were computed for areas with 50%woods and 50%grass(pasture)cover.Other combinations of conditions may be computed
from the CN's for woods and pasture.
6 Poor: Forest litter,small trees,and brush are destroyed by heavy grazing or regular burning.
Fair: Woods are grazed but not burned,and some forest litter covers the soil.
Good.• Woods are protected from grazing,and litter and brush adequately cover the soil.
(210-VI-TR-55,Second Ed.,June 1986) 2-7
Chapter 3 Time of Concentration and Travel Time Technical Release 55
Urban Hydrology for Small Watersheds
Sheet flow For sheet flow of less than 300 feet,use Manning's
kinematic solution(Overtop and Meadows 1976)to
Sheet flow is flow over plane surfaces. It usually compute Tt:
occurs in the headwater of streams. With sheet flow, 08
the friction value(Manning's n)is an effective rough- _ 0.007(nL) *-
ness coefficient that includes the effect of raindrop Tt P2)0.5SO.4 [eq. 3-3]
impact; drag over the plane surface; obstacles such as
litter, crop ridges,and rocks; and erosion and trans- where:
portation of sediment.These n values are for very
shallow flow depths of about 0.1 foot or so. Table 3-1 Tt = travel time (hr),
gives Manning's n values for sheet flow for various n = Manning's roughness coefficient(table 3-1)
surface conditions. L = flow length(ft)
P2 = 2-year, 24-hour rainfall(in)
s = slope of hydraulic grade line
Table 3-1 Roughness coefficients(Manning's n)for (land slope,ft/ft)
sheet flow
This simplified form of the Manning's kinematic solu-
Surface description n 1/ tion is based on the following: (1) shallow steady
uniform flow, (2)constant intensity of rainfall excess
Smooth surfaces(concrete,asphalt, (that part of a rain available for runoff), (3)rainfall
gravel,or bare soil).......................................... 0.011 duration of 24 hours, and(4)minor effect of infiltra-
Fallow(no residue) 0.05 tion on travel time. Rainfall depth can be obtained
Cultivated soils: from appendix B.
Residue cover<_20%......................................... 0.06
Residue cover>20/0 0.17 Shallow concentrated flow
Grass:
Short grass prairie............................................ 0.15 After a maximum of 300 feet, sheet flow usually be-
Dense grasses 2i ....................... 0.24 comes shallow concentrated flow. The average veloc-
.........................
Bermuda rass 0.41 ity for this flow can be determined from figure 3-1,in
Range natural 0.13 which average velocity is a function of watercourse
Woods:-
3, slope and type of channel. For slopes less than 0.005
Li ht underbrush.............................................. 0.40 ft/ft,use equations given in appendix F for figure 3-1.
Dense underbrush............................................ 0.80
Tillage can affect the direction of shallow concen-
trated flow. Flow may not always be directly down the
1 The n values are a composite of information compiled by Engman watershed slope if tillage runs across the slope.
(1986).
2 Includes species such as weeping lovegrass,bluegrass,buffalo
grass,blue grama grass,and native grass mixtures. After determining average velocity in figure 3-1,use
3 When selecting n,consider cover to a height of about 0.1 ft.This equation 3-1 to estimate travel time for the shallow
is the only part of the plant cover that will obstruct sheet flow. concentrated flow segment.
Open channels
Open channels are assumed to begin where surveyed
cross section information has been obtained,where
channels are visible on aerial photographs, or where
blue lines(indicating streams) appear on United States
Geological Survey(USGS)quadrangle sheets.
Manning's equation or water surface profile informa-
tion can be used to estimate average flow velocity.
Average flow velocity is usually determined for bank-
full elevation.
(210-VI-TR-55,Second Ed.,June 1986) 3-3
Chapter 3 Time of Concentration and Travel Time Technical Release 55
Urban Hydrology for Small Watersheds
Figure 3-1 Average velocities for estimating travel time for shallow concentrated flow
.50
9
.20 AF
.10 -
Q - -
o - -
�' .06 -
a�
L
0 a
M .04
.02
-1 1 1 1 1 1 1 Ititi
Pre-,1-Yr,10-Yr,&
Post-,1-Yr,10-Yr,& 100-Yr
100-Yr
.01 _j
Post-,1-Yr,10-Yr,&
100-Yr
.005 -
1 2 4 6 10 20
Average velocity(ft/sec)
3-2 (210-VI-TR-55,Second Ed.,June 1986)
Chapter 4 Graphical Peak Discharge Method
This chapter presents the Graphical Peak Discharge Figure 4-1 Variation of Ia/P for P and CN
method for computing peak discharge from rural and
urban areas.The Graphical method was developed 1.0
from hydrograph analyses using TR-20, "Computer
Program for Project Formulation Hydrology" 0.8
(SCS 1983).The peak discharge equation used is:
qp = quAmQFp [eq. 4-1] a 0.6
c�
CN = 40
where: 0.4 50
60
qp = peak discharge(cfs) 70
0.2 80
%= unit peak discharge (csm/in) 9-0-
AM= drainage area(mil)
Q = runoff(in) 0 g 11 1
Fp= pond and swamp adjustment factor 1 3 5 7 3 15
Rainfall (P), inches
The input requirements for the Graphical method are
as follows: (1)Tc(hr), (2)drainage area(mi2), (3) Table 4-1 Ia values for runoff curve numbers
appropriate rainfall distribution(I, 1A,II, or III), (4)
24-hour rainfall(in), and(5) CN. If pond and swamp
areas are spread throughout the watershed and are not Curve Ia Curve Ia
considered in the TC computation, an adjustment for number (in) number (in)
pond and swamp areas is also needed. 40......................3.000 70......................0.857
41......................2.878 71 ......................0.817
Peak discharge computation 42......................2.762 72......................0.778
43......................2.651 73......................0.740
For a selected rainfall frequency,the 24-hour rainfall 44......................2.545 74......................0.703
(P)is obtained from appendix B or more detailed local 45......................2.444 75......................0.667
precipitation maps. CN and total runoff(Q)for the 46......................2.348 76......................0.632
watershed are computed according to the methods 47......................2.255 77......................0.597
48......................2.167 78......................0.564
outlined in chapter 2. The CN is used to determine the 49 2.082 79 0.532
...................... ......................
initial abstraction(Ia)from table 4-1. Ia/P is then 50 ....2.000 80 ........0.500
computed.p 51...................... 1.922 81......................0.469
52...................... 1.846 82......................0.439
If the computed Ia/P ratio is outside the range in 53...................... 1.774 83......................0.410
exhibit 4(4-I,4-IA,4-II, and 4-III)for the rainfall distri- 54...................... 1.704 84......................0.381
bution of interest,then the limiting value should be 55...................... 1.636 85......................0.353
used. If the ratio falls between the limiting values,use 56...................... 1.571 86......................0.326
linear interpolation. Figure 4-1 illustrates the sensitiv- 57...................... 1.509 87......................0.299
ity of Ia/P to CN and P. 58...................... 1.448 88......................0.273
59...................... 1.390 89......................0.247
160---------------------- 1.333 90......................0.222
Peak discharge per square mile per inch of runoff(qu) 61...................... 1.279 91......................0.198
is obtained from exhibit 4-I,4-IA1 4-II, or 4-III by using 62 1.226 92 0.174
...................... ......................
Tc(chapter 3),rainfall distribution type, and Ia/P 63 .... 1.175 93 0.151
.................. ......................
ratio. The pond and swamp adjustment factor is ob- 64...................... 1.125 94......................0.128
tained from table 4-2 (rounded to the nearest table 65...................... 1.077 95......................0.105
value).Use worksheet 4 in appendix D to aid in com- 66...................... 1.030 96......................0.083
puting the peak discharge using the Graphical method. 67......................0.985 97......................0.062
68......................0.941 98......................0.041
69......................0.899
(210-VI-TR-55,Second Ed.,June 1986) 4-1
Chapter 4 Graphical Peak Dischage Method Technical Release 55
Urban Hydrology for Small Watersheds
Exhibit 4-III Unit peal discharge(qu)for NRCS(SCS)type III rainfall distribution
700
Area A-Post-,10-Yr&100-Yr:
600 (0.10,540)
Area A-Pre-,100-Yr:
Area A-Post-,1-Yr: (0.16,390)
500 (0.18.505)
Area A-Pre-,10-Yr:
(0.25.380)
400 Area A-Pre-,1-Yr:
(0.47.220)
d�A
c 300 .30
S
� 200 0 SO
c�
ca
a�
a
100
80
60
40
.1 .2 .4 .6 .8 1 2 4 6 8 10
Time of concentration (Td, (hours)
(210-VI-TR-55,Second Ed.,June 1986) 4-7
Chapter 4 Graphical Peak Dischage Method Technical Release 55
Urban Hydrology for Small Watersheds
Table 4-2 Adjustment factor(Fp)for pond and swamp • When this method is used to develop estimates of
areas that are spread throughout the peak discharge for both present and developed
watershed
conditions of a watershed,use the same procedure
for estimating T,
Percentage of pond
and swamp areas Fp • TC values with this method may range from 0.1 to
10 hours.
0..................................................... 1.00
0.2..................................................0.97
1.0..................................................0.87 Example 4-1
3.0..................................................0.75
5.0..................................................0.72 Compute the 25-year peak discharge for the 250-acre
watershed described in examples 2-2 and 3-1. Figure 4-
Limitations 2 shows how worksheet 4 is used to compute qp as
345 cfs.
The Graphical method provides a determination of
peak discharge only.If a hydrograph is needed or
watershed subdivision is required,use the Tabular
Hydrograph method(chapter 5). Use TR-20 if the
watershed is very complex or a higher degree of
accuracy is required.
• The watershed must be hydrologically homoge-
neous,that is, describable by one CN.Land use,
soils, and cover are distributed uniformly through-
out the watershed.
• The watershed may have only one main stream or,
if more than one,the branches must have nearly
equal Tc' s.
• The method cannot perform valley or reservoir
routing.
• The Fp factor can be applied only for ponds or
swamps that are not in the TC flow path.
• Accuracy of peak discharge estimated by this
method will be reduced if Ia/P values are used that
are outside the range given in exhibit 4.The limit-
ing Ia/P values are recommended for use.
• This method should be used only if the weighted
CN is greater than 40.
4-2 (210-VI-TR-55,Second Ed.,June 1986)
Chapter 6 Storage Volume for Detention Basins Technical Release 55
Urban Hydrology for Small Watersheds
Input requirements and Estimating VS
procedures
Use worksheet 6a to estimate VS, storage volume
Use figure 6-1 estimate storage volume(VS)required or required,by the following procedure.
peak outflow discharge(qo).The most frequent appli-
cation is to estimate VS,for which the required inputs 1. Determine qo. Many factors may dictate the selec-
are runoff volume (Vr), qo, and peak inflow discharge tion of peak outflow discharge. The most common
(qi). To estimate qo,the required inputs are Vr,VS, is to limit downstream discharges to a desired
and qi. level, such as predevelopment discharge.Another
factor may be that the outflow device has already
been selected.
2. Estimate qi by procedures in chapters 4 or 5. Do
not use peak discharges developed by other proce-
dure. When using the Tabular Hydrograph method
to estimate ql for a subarea, only use peak dis-
charge associated with Tt=0.
Figure 6-1 Approximate detention basin routing for rainfall types I,IA,II,and III
.6
Post-Area A,10-Yr
.5
N' L
> > .4
(D
-2E Post-Area A,100-Yr
O
� O /
o .3
F%%
.2lit
�
.1
.1 .2 .3 .4 .5 .6 .7 .8
Peak outflow discharge qo
Peak inflow a,
discharge i
6-2 (210-VI-TR-55,Second Ed.,June 1986)
PACIC
CLIENT DRIVEN SOLUTIONS
AREA B
P.W.GROSSER CONSULTING,INC•P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
631.589.6353 •WWW.PWGROSSER.COM•PWGC.INFO@a PWGROSSER.COM
BOHEMIA • MANHATTAN • SARATOGA SPRINGS • SYRACUSE • SHELTON, CT
Appendix H
Water Quantity Volume Calculations
Drainage Area B
Project:AVG1803
Location:56655 Route 25,Southold,NY 11971
Condition:Pre-Developed-Drainage Area B
Runoff Curve Number
Soil Name&Hydrologic Group
Cover Description 1 Curve Number Area(AC) Area(%) Product of CN x
Soil Classification HSG(HYDROLOGIC (CN) Area
SOIL GROUP)
Riverhead Sandy Loam(HaA) B Woods,Fair Condition 60 2.32 100% 60.00
Totals=1 2.32 1 100% 60.00
CN(weighted)=total product/total area= 60.00 Use CN 41 60
Runoff
Storm#1 Storm#2 Storm#3
Frequency(yr) 1 10 100
$Rainfall,P(24-hour) 2.84 5.44 8.54
S=1000/CN-10 6.67 6.67 6.67
Runoff,Q(in)=(P-0.2S)2/(P+0.8S) 0.28 1.57 3.74
Time of Concentration(T J
Sheet Flow Storm#1 Storm#2 Storm#3
Segment ID 1a 1b 1a 1b 1a 1b
Z Surface Description Grass Woods Grass Woods Grass Woods
Z Manning's Roughness coefficient(Weighted),n 0.15 0.40 0.15 0.40 0.15 0.40
3 Flow Length,L 75 75 75 75 75 75
8Rainfall,P(2-Yr,24-Hr) 3.490 3.490 3.490 3.490 3.490 3.490
3 Land slope,s 0.012 0.012 0.012 0.012 0.012 0.012
Tt(Sheet Flow)=(0.007*(n*L)o.$)/(PO.s*so.4) 0.15 0.33 0.15 0.33 0.15 0.33
Total Tt(Sheet Flow)= 0.49 0.49 0.49
Shallow Concentrated Flow Storm#1 Storm#2 Storm#3
2a 2a 2a
Surface Description Unpaved Unpaved Unpaved
3 Flow Length,L(ft) 175 175 175
3 Watercourse slope,s 0.006 0.006 0.006
4 Average velocity,V(ft/s) 1.27 1.27 1.27
Tt(Shallow Concentrated Flow)=L/(3600*V) 0.04 0.04 0.04
Total Tt(Shallow Concentrated Flow)= 0.04 0.04 0.04
Watershed Tc(hr)=Tt_sc+Total Tt_scF 0.52 0.52 0.52
Graphical Peak Discharge Method
Storm#1 Storm#2 Storm#3
Drainage Area,Am(mil) 0.0036 0.0036 0.0036
Runoff Curve Number,CN 60 60 60
Time of Concentration,Tc(hr) 0.52 0.52 0.52
Rainfall Distribution(TYPE III-Atlantic Coastal Areas) III III III
Pond and Swamp area spread throughout watershed 0 0 0
Frequency(yr) 1 10 100
Rainfall,P(24-hour) 2.84 5.44 8.54
5 Initial abstraction,la(in) 1.333 1.333 1.333
Compute la/P 0.47 0.25 0.16
6 Unit peak discharge,qu(csm/in) 215 360 390
Runoff,Q(in) 0.278 1.57 3.74
Pond and Swamp adjustment factor,Fp 1 1 1
Peak discharge,qp(ft3/s)=qu*Am*Q*FP 0.22 2.04 5.29
1 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 2-2,page 2-5&2-7
Z United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 3-1,page 3-3
3 Refer to the attached FIGURE-1&2 for Pre and Post-Development Flow Lengths
4 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Figure 3-1,page 3-2
5 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 4-1,page 4-1
6 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Exhibit 4-III,page 4-7
United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 4-2,page 4-2
8 NOAA Atlas 14,Volume 10,Version 3.Point Precipitation Frequency(PF)Estimates With 90%Confidence Intervals and Supplementary Information
1of3
Appendix H
Water Quantity Volume Calculations
Drainage Area B
Project:AVG1803
Location:56655 Route 25,Southold,NY 11971
Condition:Post-Developed-Drainage Area B
Runoff Curve Number
Soil Name&Hydrologic Group
Cover Description 1 Curve Number Area(AC) Area(%) Product of CN x
Soil Classification HSG(HYDROLOGIC (CN) Area
SOIL GROUP)
Riverhead Sandy Loam(HaA) B Impervious 98 1.30 56% 54.91
Riverhead Sandy Loam(HaA) B Open space,Fair 69 1.02 44% 30.34
Totals= 2.32 100% 85.25
CN(weighted)=total product/total area= 85.25 Use CN 41 85
Runoff
Storm#1 Storm#2 Storm#3
Frequency(yr) 1 10 100
$Rainfall,P(24-hour) 2.84 5.44 8.54
S=1000/CN-10 1.73 1.73 1.73
Runoff,Q(in)=(P-0.2S)2/(P+0.8S) 1.47 3.80 6.77
Time of Concentration(T J
Sheet Flow Storm#1 Storm#2 Storm#3
Segment ID 1a 1a 1a
Z Surface Description Grass Grass Grass
Z Manning's Roughness coefficient(Weighted),n 0.15 0.15 0.15
3 Flow Length,L 100 100 100
8Rainfall,P(2-Yr,24-Hr) 3.490 3.490 3.490
3Land slope,s 0.015 0.015 0.015
Tt(Sheet Flow)=(0.007*(n*L)o.$)/(PO.s*so.4) 0.18 0.18 0.18
Total Tt(Sheet Flow)= 0.18 0.18 0.18
Shallow Concentrated Flow Storm#1 Storm#2 Storm#3
Segment ID 2a 2a 2a
Surface Description Unpaved Unpaved Unpaved
3 Flow Length,L 222 222 222
3 Watercourse slope,s 0.010 0.010 0.010
4 Average velocity,V 1.60 1.60 1.60
Tt(Shallow Concentrated Flow)=L/(3600*V) 0.04 0.04 0.04
Total Tt(Shallow Concentrated Flow)= 0.04 0.04 0.04
Watershed r =I t_sc+Total Tt-sCF 0.21 1 0.21 0.21
Graphical Peak Discharge Method
Storm#1 Storm#2 Storm#3
Drainage Area,Am(mil) 0.0036 0.0036 0.0036
Runoff Curve Number,CN 85 85 85
Time of Concentration,Tc(hr) 0.21 0.21 0.21
Rainfall Distribution(TYPE III-Atlantic Coastal Areas) III III III
Pond and Swamp area spread throughout watershed 0 0 0
Frequency(yr) 1 10 100
Rainfall,P(24-hour) 2.84 5.44 8.54
5 Initial abstraction,la(in) 0.353 0.353 0.353
Compute I a/P 0.12 0.06 I Use 0.10 0.04 I Use 0.10
6 Unit peak discharge,qu(csm/in) 545 550 550
Runoff,Q(in) 1.47 3.80 6.77
Pond and Swamp adjustment factor,Fp 1 1 1
Peak discharge,qp(ft3/s)=qu*Am*Q*FP 2.91 7.58 13.49
1 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 2-2,page 2-5&2-7
Z United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 3-1,page 3-3
3 Refer to the attached FIGURE-1&2 for Pre and Post-Development Flow Lengths
4 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Figure 3-1,page 3-2
5 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 4-1,page 4-1
6 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Exhibit 4-III,page 4-7
United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 4-2,page 4-2
8 NOAA Atlas 14,Volume 10,Version 3.Point Precipitation Frequency(PF)Estimates With 90%Confidence Intervals and Supplementary Information
2of3
Appendix H
Water Quantity Volume Calculations
Drainage Area 6
Project:AVG 1803
Location:56655 Route 25,Southold, NY 11971
Runoff Reduction(RRv)
RRv=Reduction of the total WQv by application of green infrastructure techniques and SMPs to replicate
pre-development hydrology.
WQ,= 0.32 acre-ft
100%WQv= 0.32 acre-ft
1-100%of the RRv will be provided by Infiltration Practices
Vs= 0.45 acre-ft provided
Channel Protection Volume(Cps,)-1-year,24-hour storm event(see note below)
Runoff Curve Number,CN
Initial abstraction,la(in)
Time of Concentration,Tc(hr)
6 Unit peak discharge,qu(csm/in)-1-year,24-hr Storm Event of the post development
8 Peak Outflow Discharge/Peak Inflow Discharge(qo/q;)
sVs/Vr=0.682-1.43(go/qi)+1.64(go/gi)2-0.804(go/qi)3
Runoff,Qd(in)
Total Drainage Area(acres)
CpV=VS=(VS/VMQ)(A)/12(acre-ft)
CpV=ft 3
Average Release Rate= Not required for Infiltration Practices or Tidal Discharge
Note: Cpv requirements do not apply when the reduction of the entire Cpv volume is achieved through an infiltration system
or if the site discharges directly to tidal waters.
Overbank Flood Protection Volume(QpLO)-10-year,24-hour storm
Post-Developed Peak Flow,q;(ft3/s) 7.58
Pre-Developed Peak Flow(Peak Inflow Discharge),qo(ft3/s) 2.04
Storage Volume,Vs=Qp-10(acre-ft) 0.45
Runoff,Q(in) 3.80
Runoff Volume,Vr(acre-ft)=(Q/12)*A 0.74
VS/Vr 0.617
8qo/q; 0.100
Peak Outflow Discharge,Qp10,(cfs)=qi*(q0/qi) 0.76
Post-Development Peak Discharge 0.76 cfs< Pre-Development Peak Discharge 2.04 cfs; OK
Extreme Flood Protection Volume(04)100-year,24-hour storm
Post-Developed Peak Flow,q;(ft3/s) 13.49
Pre-Developed Peak Flow(Peak Inflow Discharge),qo(ft3/s) 5.29
Storage Volume,Vs=Qp-10(acre-ft) 0.45
Runoff,Q(in) 6.77
Runoff Volume,Vr(acre-ft)=(Q/12)*A 1.31
VS/Vr 0.347
Z5go/q; 0.355
Peak Outflow Discharge,Qf100,(cfs)=qi*(q0/qi) 4.79
Post-Development Peak Discharge 4.79 cfs< Pre-Development Peak Discharge 5.29 cfs; OK
8 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Figure 6-1,page 6-2
3of3
Chapter 2 Estimating Runoff Technical Release 55
Urban Hydrology for Small Watersheds
Table 2-2a Runoff curve numbers for urban areas 1/
Curve numbers for
------------------------------------------- Cover description ----------------------------------------- -----------hydrologic soil group-------------
Average percent
Cover type and hydrologic condition impervious area 2/ A B C D
Fully developed urban areas (vegetation established)
Open space(lawns,parks,golf courses,cemeteries,etc.)3/:
Poor condition(grass cover<50%).......................................... 68 86 89
Fair condition(grass cover 50%to 759/6) .................................. 49 79 84
69
Good condition(grass cover>75%)......................................... 39 74 80
Impervious areas:
Paved parking lots,roofs,driveways,etc.
(excluding right-of-way)............................................................. 98 98 98 98
Streets and roads:
Paved;curbs and storm sewers(excluding
right-of-way) ................................................................................ 98 98 98 98
Paved;open ditches(including right-of-way).......................... 83 89 92 93
Gravel(including right-of-way)................................................. 76 85 89 91
Dirt(including right-of-way)...................................................... 72 82 87 89
Western desert urban areas:
Natural desert landscaping(pervious areas only) 4i..................... 63 77 85 88
Artificial desert landscaping(impervious weed barrier,
desert shrub with 1-to 2-inch sand or gravel mulch
and basin borders) ...................................................................... 96 96 96 96
Urban districts:
Commercial and business................................................................. 85 89 92 94 95
Industrial............................................................................................. 72 81 88 91 93
Residential districts by average lot size:
1/8 acre or less(town houses).......................................................... 65 77 85 90 92
1/4 acre ................................................................................................ 38 61 75 83 87
1/3 acre ................................................................................................ 30 57 72 81 86
1/2 acre ................................................................................................ 25 54 70 80 85
1 acre ................................................................................................... 20 51 68 79 84
2 acres.................................................................................................. 12 46 65 77 82
Developing urban areas
Newly graded areas
(pervious areas only,no vegetation)5/................................................................ 77 86 91 94
Idle lands(CN's are determined using cover types
similar to those in table 2-2c).
1 Average runoff condition,and Ia=0.2S.
2 The average percent impervious area shown was used to develop the composite CN's.Other assumptions are as follows:impervious areas are
directly connected to the drainage system,impervious areas have a CN of 98,and pervious areas are considered equivalent to open space in
good hydrologic condition.CN's for other combinations of conditions may be computed using figure 2-3 or 2-4.
3 CN's shown are equivalent to those of pasture.Composite CN's may be computed for other combinations of open space
cover type.
4 Composite CN's for natural desert landscaping should be computed using figures 2-3 or 2-4 based on the impervious area percentage
(CN=98)and the pervious area CN.The pervious area CN's are assumed equivalent to desert shrub in poor hydrologic condition.
5 Composite CN's to use for the design of temporary measures during grading and construction should be computed using figure 2-3 or 2-4
based on the degree of development(impervious area percentage)and the CN's for the newly graded pervious areas.
(210-VI-TR-55,Second Ed.,June 1986) 2-5
Chapter 2 Estimating Runoff Technical Release 55
Urban Hydrology for Small Watersheds
Table 2-2c Runoff curve numbers for other agricultural lands li
Curve numbers for
--------------------------------------- Cover description -------------------------------------- - hydrologic soil group
----------- ---------------
Hydrologic
Cover type condition A B C D
Pasture,grassland,or range—continuous Poor 68 79 86 89
forage for grazing.2/ Fair 49 69 79 84
Good 39 61 74 80
Meadow—continuous grass,protected from — 30 58 71 78
grazing and generally mowed for hay.
Brush—brush-weed-grass mixture with brush Poor 48 67 77 83
the major element.3i Fair 35 56 70 77
Good 30 4/ 48 65 73
Woods—grass combination(orchard Poor 57 73 82 86
or tree farm).Ji Fair 43 65 76 82
Good 32 58 72 79
Woods.6/ Poor 45 77 83
Fair 36 60 73 79
Good 30 4/ 70 77
Farmsteads—buildings,lanes,driveways, — 59 74 82 86
and surrounding lots.
1 Average runoff condition,and Ia=0.25.
2 Poor: <50%)ground cover or heavily grazed with no mulch.
Fair: 50 to 75%ground cover and not heavily grazed.
Good.• >75%ground cover and lightly or only occasionally grazed.
3 Poor. <50%ground cover.
Fair: 50 to 75%ground cover.
Good.• >75%ground cover.
4 Actual curve number is less than 30;use CN=30 for runoff computations.
5 CN's shown were computed for areas with 50%woods and 50%grass(pasture)cover.Other combinations of conditions may be computed
from the CN's for woods and pasture.
6 Poor: Forest litter,small trees,and brush are destroyed by heavy grazing or regular burning.
Fair: Woods are grazed but not burned,and some forest litter covers the soil.
Good.• Woods are protected from grazing,and litter and brush adequately cover the soil.
(210-VI-TR-55,Second Ed.,June 1986) 2-7
Chapter 3 Time of Concentration and Travel Time Technical Release 55
Urban Hydrology for Small Watersheds
Sheet flow For sheet flow of less than 300 feet,use Manning's
kinematic solution(Overtop and Meadows 1976)to
Sheet flow is flow over plane surfaces. It usually compute Tt:
occurs in the headwater of streams. With sheet flow, 08
the friction value(Manning's n)is an effective rough- _ 0.007(nL) *-
ness coefficient that includes the effect of raindrop Tt P2)0.5SO.4 [eq. 3-3]
impact; drag over the plane surface; obstacles such as
litter, crop ridges,and rocks; and erosion and trans- where:
portation of sediment.These n values are for very
shallow flow depths of about 0.1 foot or so. Table 3-1 Tt = travel time (hr),
gives Manning's n values for sheet flow for various n = Manning's roughness coefficient(table 3-1)
surface conditions. L = flow length(ft)
P2 = 2-year, 24-hour rainfall(in)
s = slope of hydraulic grade line
Table 3-1 Roughness coefficients(Manning's n)for (land slope,ft/ft)
sheet flow
This simplified form of the Manning's kinematic solu-
Surface description n 1/ tion is based on the following: (1) shallow steady
uniform flow, (2)constant intensity of rainfall excess
Smooth surfaces(concrete,asphalt, (that part of a rain available for runoff), (3)rainfall
gravel,or bare soil) 0.011 duration of 24 hours, and(4)minor effect of infiltra-
Fallow(no residue) 0.05 tion on travel time. Rainfall depth can be obtained
..................................................
Cultivated soils: from appendix B.
Residue cover<_20%......................................... 0.06
Residue cover>20/0 0.17 Shallow concentrated flow
Grass:
Short grass prairie............................................ 0.15 After a maximum of 300 feet, sheet flow usually be-
Dense grasses 2i ....................... 0.24 comes shallow concentrated flow. The average veloc-
.........................
Bermuda rass 0.41 ity for this flow can be determined from figure 3-1,in
Range natural 0.13 which average velocity is a function of watercourse
Woods:-
3, slope and type of channel. For slopes less than 0.005
Light underbrush.............................................. 0.40 ft/ft,use equations given in appendix F for figure 3-1.
Dense underbrush............................................ 0.80
Tillage can affect the direction of shallow concen-
trated flow. Flow may not always be directly down the
1 The n values are a composite of information compiled by Engman watershed slope if tillage runs across the slope.
(1986).
2 Includes species such as weeping lovegrass,bluegrass,buffalo
grass,blue grama grass,and native grass mixtures. After determining average velocity in figure 3-1,use
3 When selecting n,consider cover to a height of about 0.1 ft.This equation 3-1 to estimate travel time for the shallow
is the only part of the plant cover that will obstruct sheet flow. concentrated flow segment.
Open channels
Open channels are assumed to begin where surveyed
cross section information has been obtained,where
channels are visible on aerial photographs, or where
blue lines(indicating streams) appear on United States
Geological Survey(USGS)quadrangle sheets.
Manning's equation or water surface profile informa-
tion can be used to estimate average flow velocity.
Average flow velocity is usually determined for bank-
full elevation.
(210-VI-TR-55,Second Ed.,June 1986) 3-3
Chapter 3 Time of Concentration and Travel Time Technical Release 55
Urban Hydrology for Small Watersheds
Figure 3-1 Average velocities for estimating travel time for shallow concentrated flow
.50
9
.20 AF
.10 -
Q - -
o - -
�' .06 -
a�
L
0 a
M .04
.02
Post-,1-Yr,10-Yr,&
100-Yr
.01
Pre-,1-Yr,10-Yr,&
100-Yr
.005 -
1 2 4 6 10 20
Average velocity(ft/sec)
3-2 (210-VI-TR-55,Second Ed.,June 1986)
Chapter 4 Graphical Peak Discharge Method
This chapter presents the Graphical Peak Discharge Figure 4-1 Variation of Ia/P for P and CN
method for computing peak discharge from rural and
urban areas.The Graphical method was developed 1.0
from hydrograph analyses using TR-20, "Computer
Program for Project Formulation Hydrology" 0.8
(SCS 1983).The peak discharge equation used is:
qp = quAmQFp [eq. 4-1] a 0.6
c�
CN = 40
where: 0.4 50
60
qp = peak discharge(cfs) 70
0.2 80
%= unit peak discharge (csm/in) 9-0-
AM= drainage area(mil)
Q = runoff(in) 0 g 11 1
Fp= pond and swamp adjustment factor 1 3 5 7 3 15
Rainfall (P), inches
The input requirements for the Graphical method are
as follows: (1)Tc(hr), (2)drainage area(mi2), (3) Table 4-1 Ia values for runoff curve numbers
appropriate rainfall distribution(I, 1A,II, or III), (4)
24-hour rainfall(in), and(5) CN. If pond and swamp
areas are spread throughout the watershed and are not Curve Ia Curve Ia
considered in the TC computation, an adjustment for number (in) number (in)
pond and swamp areas is also needed. 40......................3.000 70......................0.857
41......................2.878 71 ......................0.817
Peak discharge computation 42......................2.762 72......................0.778
43......................2.651 73......................0.740
For a selected rainfall frequency,the 24-hour rainfall 44......................2.545 74......................0.703
(P)is obtained from appendix B or more detailed local 45......................2.444 75......................0.667
precipitation maps. CN and total runoff(Q)for the 46......................2.348 76......................0.632
watershed are computed according to the methods 47......................2.255 77......................0.597
48......................2.167 78......................0.564
outlined in chapter 2. The CN is used to determine the 49 2.082 79 0.532
...................... ......................
initial abstraction(Ia)from table 4-1. Ia/P is then 50 ....2.000 80......................0.500
computed. 51...................... 1.922 81......................0.469
52...................... 1.846 82......................0.439
If the computed Ia/P ratio is outside the range in 53...................... 1.774 83......................0.410
exhibit 4(4-I,4-IA,4-II, and 4-III)for the rainfall distri- 54...................... 1.704 84......................0.381
bution of interest,then the limiting value should be 55...................... 1.636 F85......................0.353
used. If the ratio falls between the limiting values,use 56...................... 1.571 86......................0.326
linear interpolation. Figure 4-1 illustrates the sensitiv- 57...................... 1.509 87......................0.299
ity of Ia/P to CN and P. 58...................... 1.448 88......................0.273
59...................... 1.390 89......................0.247
160---------------------- 1.333 90......................0.222
Peak discharge per square mile per inch of runoff(qu) 61...................... 1.279 91......................0.198
is obtained from exhibit 4-I,4-IA1 4-II, or 4-III by using 62 1.226 92 0.174
...................... ......................
Tc(chapter 3),rainfall distribution type, and Ia/P 63 .... 1.175 93 0.151
.................. ......................
ratio. The pond and swamp adjustment factor is ob- 64...................... 1.125 94......................0.128
tained from table 4-2 (rounded to the nearest table 65...................... 1.077 95......................0.105
value).Use worksheet 4 in appendix D to aid in com- 66...................... 1.030 96......................0.083
puting the peak discharge using the Graphical method. 67......................0.985 97......................0.062
68......................0.941 98......................0.041
69......................0.899
(210-VI-TR-55,Second Ed.,June 1986) 4-1
Chapter 4 Graphical Peak Dischage Method Technical Release 55
Urban Hydrology for Small Watersheds
Exhibit 4-III Unit peal discharge(qu)for NRCS(SCS)type III rainfall distribution
700
Area B-Post-,10-Yr&100-Yr:
600 (0.10,550)
Area B-Pre-,100-Yr:
Area B-Post-,1-Yr: (0.16,390)
500 (0.12,545)
Area B-Pre-,10-Yr:
(0.25.360)
400 Area B-Pre-,1-Yr:
(0.47,215)
d�A
c 300 .
O
E 3S
w
%01 O
200 S
' 0
c�
ca
a�
a
100
80
60
40
.1 .2 .4 .6 .8 1 2 4 6 8 10
Time of concentration (Td, (hours)
(210-VI-TR-55,Second Ed.,June 1986) 4-7
Chapter 4 Graphical Peak Dischage Method Technical Release 55
Urban Hydrology for Small Watersheds
Table 4-2 Adjustment factor(Fp)for pond and swamp • When this method is used to develop estimates of
areas that are spread throughout the peak discharge for both present and developed
watershed
conditions of a watershed,use the same procedure
for estimating T,
Percentage of pond
and swamp areas Fp • TC values with this method may range from 0.1 to
10 hours.
0..................................................... 1.00
0.2..................................................0.97
1.0..................................................0.87 Example 4-1
3.0..................................................0.75
5.0..................................................0.72 Compute the 25-year peak discharge for the 250-acre
watershed described in examples 2-2 and 3-1. Figure 4-
Limitations 2 shows how worksheet 4 is used to compute qp as
345 cfs.
The Graphical method provides a determination of
peak discharge only.If a hydrograph is needed or
watershed subdivision is required,use the Tabular
Hydrograph method(chapter 5). Use TR-20 if the
watershed is very complex or a higher degree of
accuracy is required.
• The watershed must be hydrologically homoge-
neous,that is, describable by one CN.Land use,
soils, and cover are distributed uniformly through-
out the watershed.
• The watershed may have only one main stream or,
if more than one,the branches must have nearly
equal Tc' s.
• The method cannot perform valley or reservoir
routing.
• The Fp factor can be applied only for ponds or
swamps that are not in the TC flow path.
• Accuracy of peak discharge estimated by this
method will be reduced if Ia/P values are used that
are outside the range given in exhibit 4.The limit-
ing Ia/P values are recommended for use.
• This method should be used only if the weighted
CN is greater than 40.
4-2 (210-VI-TR-55,Second Ed.,June 1986)
Chapter 6 Storage Volume for Detention Basins Technical Release 55
Urban Hydrology for Small Watersheds
Input requirements and Estimating VS
procedures
Use worksheet 6a to estimate VS, storage volume
Use figure 6-1 estimate storage volume(VS)required or required,by the following procedure.
peak outflow discharge(qo).The most frequent appli-
cation is to estimate VS,for which the required inputs 1. Determine qo. Many factors may dictate the selec-
are runoff volume (Vr), qo, and peak inflow discharge tion of peak outflow discharge. The most common
(qi). To estimate qo,the required inputs are Vr,VS, is to limit downstream discharges to a desired
and qi. level, such as predevelopment discharge.Another
factor may be that the outflow device has already
been selected.
2. Estimate qi by procedures in chapters 4 or 5. Do
not use peak discharges developed by other proce-
dure. When using the Tabular Hydrograph method
to estimate ql for a subarea, only use peak dis-
charge associated with Tt=0.
Figure 6-1 Approximate detention basin routing for rainfall types I,IA,II,and III
.6
Post-Area B,10-Yr
.5
> �> .4 kk
O O Post-Area B,100-Yr
E E
5
O 5
>
N .>
!kN
o .3
74%
.2 �
.1
.1 .2 .3 .4 .5 .6 .7 .8
Peak outflow discharge qo
Peak inflow a,
discharge i
6-2 (210-VI-TR-55,Second Ed.,June 1986)
PACIC
CLIENT DRIVEN SOLUTIONS
AREA C
P.W.GROSSER CONSULTING,INC•P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
631.589.6353 •WWW.PWGROSSER.COM•PWGC.INFO@a PWGROSSER.COM
BOHEMIA • MANHATTAN • SARATOGA SPRINGS • SYRACUSE • SHELTON, CT
Appendix H
Water Quantity Volume Calculations
Drainage Area C
Project:AVG1803
Location:56655 Route 25,Southold,NY 11971
Condition:Pre-Developed-Drainage Area C
Runoff Curve Number
Soil Name&Hydrologic Group
Cover Description 1 Curve Number Area(AC) Area(%) Product of CN x
Soil Classification HSG(HYDROLOGIC (CN) Area
SOIL GROUP)
Riverhead Sandy Loam(HaA) B Open Space,Fair Condition 69 0.33 21% 14.79
Riverhead Sandy Loam(HaA) B Woods,Fair Condition 60 1 1.21 1 79% 47.14
Totals= 1.54 1 100% 61.93
CN(weighted)=total product/total area= 61.93 Use CN 41 62
Runoff
Storm#1 Storm#2 Storm#3
Frequency(yr) 1 10 100
$Rainfall,P(24-hour) 2.84 5.44 8.54
S=1000/CN-10 6.15 6.15 6.15
Runoff,Q(in)=(P-0.2S)2/(P+0.8S) 0.33 1.71 3.97
Time of Concentration(TJ
Sheet Flow Storm#1 Storm#2 Storm#3
Segment ID 1a 1b 1a 1b 1a 1b
Z Surface Description Woods Grass Smooth Surf. Grass Smooth Surf. Grass
Z Manning's Roughness coefficient(Weighted),n 0.40 0.15 0.40 0.15 0.40 0.15
3 Flow Length,L 75 75 75 75 75 75
8Rainfall,P(2-Yr,24-Hr) 3.490 3.490 3.490 3.490 3.490 3.490
3 Land slope,s 0.003 0.003 0.003 0.003 0.003 0.003
Tt(Sheet Flow)=(0.007*(n*L)o.$)/(PO.s*so.4) 0.58 0.27 0.58 0.27 0.58 0.27
Total Tt(Sheet Flow)= 0.85 0.85 0.85
Shallow Concentrated Flow Storm#1 Storm#2 Storm#3
2a 2a 2a
Surface Description Unpaved Unpaved Unpaved
3 Flow Length,L(ft) 22 22 22
3 Watercourse slope,s 0.006 0.006 0.006
4 Average velocity,V(ft/s) 1.25 1.25 1.25
Tt(Shallow Concentrated Flow)=L/(3600*V) 0.005 0.005 0.005
Total Tt(Shallow Concentrated Flow)= 0.005 0.005 0.005
Watershed Tc(hr)=Tt_sc+Total Tt_scF 0.85 0.85 0.85
Graphical Peak Discharge Method
Storm#1 Storm#2 Storm#3
Drainage Area,Ar,(mil) 0.0024 0.0024 0.0024
Runoff Curve Number,CN 62 62 62
Time of Concentration,Tc(hr) 0.85 0.85 0.85
Rainfall Distribution(TYPE III-Atlantic Coastal Areas) III III III
Pond and Swamp area spread throughout watershed 0 0 0
Frequency(yr) 1 10 100
Rainfall,P(24-hour) 2.84 5.44 8.54
5 Initial abstraction,la(in) 1.226 1.226 1.226
Compute la/P 0.43 0.23 0.14
6 Unit peak discharge,qu(csm/in) 180 290 310
Runoff,Q(in) 0.33 1.71 3.97
Pond and Swamp adjustment factor,Fp 1 1 1
Peak discharge,qp(ft3/s)=qu*Am*Q*FP 0.14 1.19 2.96
1 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 2-2,page 2-5&2-7
Z United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 3-1,page 3-3
3 Refer to the attached FIGURE-1&2 for Pre and Post-Development Flow Lengths
4 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Figure 3-1,page 3-2
5 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 4-1,page 4-1
6 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Exhibit 4-III,page 4-7
United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 4-2,page 4-2
8 NOAA Atlas 14,Volume 10,Version 3.Point Precipitation Frequency(PF)Estimates With 90%Confidence Intervals and Supplementary Information
1of3
Appendix H
Water Quantity Volume Calculations
Drainage Area C
Project:AVG1803
Location:56655 Route 25,Southold,NY 11971
Condition:Post-Developed-Drainage Area C
Runoff Curve Number
Soil Name&Hydrologic Group
Cover Description 1 Curve Number Area(AC) Area(%) Product of CN x
Soil Classification HSG(HYDROLOGIC (CN) Area
SOIL GROUP)
Riverhead Sandy Loam(HaA) B Impervious Area 98 0.40 26% 25.52
Riverhead Sandy Loam(HaA) B Open space,Fair 69 1.14 74% 51.03
Totals= 1.54 100% 76.55
CN(weighted)=total product/total area= 76.55 Use CN 41 77
Runoff
Storm#1 Storm#2 Storm#3
Frequency(yr) 1 10 100
$Rainfall,P(24-hour) 2.84 5.44 8.54
S=1000/CN-10 3.06 3.06 3.06
Runoff,Q(in)=(P-0.2S)2/(P+0.8S) 0.94 2.95 5.72
Time of Concentration(TJ
Sheet Flow Storm#1 Storm#2 Storm#3
Segment ID 1a 1a 1a
Z Surface Description Grass Grass Grass
Z Manning's Roughness coefficient(Weighted),n 0.15 0.15 0.15
3 Flow Length,L 100 100 100
8Rainfall,P(2-Yr,24-Hr) 3.490 3.490 3.490
3Land slope,s 0.010 0.010 0.010
Tt(Sheet Flow)=(0.007*(n*L)o.$)/(PO.s*so.4) 0.21 0.21 0.21
Total Tt(Sheet Flow)= 0.21 0.21 0.21
Shallow Concentrated Flow Storm#1 Storm#2 Storm#3
Segment ID 2a 2a 2a
Surface Description Unpaved Unpaved Unpaved
3 Flow Length,L 86 86 86
3 Watercourse slope,s 0.014 0.014 0.014
4 Average velocity,V 1.90 1.90 1.90
Tt(Shallow Concentrated Flow)=L/(3600*V) 0.01 0.01 0.01
Total Tt(Shallow Concentrated Flow)= 0.01 0.01 0.01
Watershed T,(hr)=Tt_sc+Total Tt_scF 0.22 1 0.22 0.22
Graphical Peak Discharge Method
Storm#1 Storm#2 Storm#3
Drainage Area,Am(mil) 0.0024 0.0024 0.0024
Runoff Curve Number,CN 77 77 77
Time of Concentration,Tc(hr) 0.22 0.22 0.22
Rainfall Distribution(TYPE III-Atlantic Coastal Areas) III III III
Pond and Swamp area spread throughout watershed 0 0 0
Frequency(yr) 1 10 100
Rainfall,P(24-hour) 2.84 5.44 8.54
5 Initial abstraction,la(in) 0.597 0.597 0.597
Compute I a/P 0.21 0.11 0.07 I Use 0.10
6 Unit peak discharge,qu(csm/in) 500 534 535
Runoff,Q(in) 0.938 2.95 5.72
Pond and Swamp adjustment factor,Fp 1 1 1
Peak discharge,qp(ft3/s)=qu*Am*Q*FP 1.13 3.79 7.34
1 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 2-2,page 2-5&2-7
Z United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-SS,1986,Table 3-1,page 3-3
3 Refer to the attached FIGURE-1&2 for Pre and Post-Development Flow Lengths
4 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Figure 3-1,page 3-2
5 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 4-1,page 4-1
6 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Exhibit 4-III,page 4-7
United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-SS,1986,Table 4-2,page 4-2
8 NOAA Atlas 14,Volume 10,Version 3.Point Precipitation Frequency(PF)Estimates With 90%Confidence Intervals and Supplementary Information
2of3
Appendix H
Water Quantity Volume Calculations
Drainage Area C
Project:AVG1803
Location:56655 Route 25,Southold, NY 11971
Runoff Reduction(RRv)
RRv=Reduction of the total WQv by application of green infrastructure techniques and SMPs to replicate
pre-development hydrology.
WQ= 0.11 acre-ft
100%WQV= 0.11 acre-ft
1-100%of the RRv will be provided by Infiltration Practices
Vs= 0.25 acre-ft provided
Channel Protection Volume(Cps,)-1-year,24-hour storm event(see note below)
Runoff Curve Number,CN
Initial abstraction,la(in)
Time of Concentration,Tc(hr)
6 Unit peak discharge,qu(csm/in)-1-year,24-hr Storm Event of the post development
8 Peak Outflow Discharge/Peak Inflow Discharge(qo/q;)
s Vs/Vr=0.682-1.43(go/qi)+1.64(go/gi)2-0.804(go/qi)3
Runoff,Qd(in)
Total Drainage Area(acres)
CpV=VS=(VS/VMQ)(A)/12(acre-ft)
CpV=ft 3
Average Release Rate= Not required for Infiltration Practices or Tidal Discharge
Note: Cpv requirements do not apply when the reduction of the entire Cpv volume is achieved through an infiltration system
or if the site discharges directly to tidal waters.
Overbank Flood Protection Volume(Qpjo)-10-year,24-hour storm
Post-Developed Peak Flow,q;(ft3/s) 3.79
Pre-Developed Peak Flow(Peak Inflow Discharge),qo(ft3/s) 1.19
Storage Volume,Vs=Qp-10(acre-ft) 0.25
Runoff,Q(in) 2.95
Runoff Volume,Vr(acre-ft)=(Q/12)*A 0.38
VS/Vr 0.672
8q0/q; 0.100
Peak Outflow Discharge,Qp10,(cfs)=qi*(q0/qi) 0.38
Post-Development Peak Discharge 0.38 cfs< Pre-Development Peak Discharge 1.19 cfs; OK
Extreme Flood Protection Volume(04)100-year,24-hour storm
Post-Developed Peak Flow,q;(ft3/s) 7.34
Pre-Developed Peak Flow(Peak Inflow Discharge),qo(ft3/s) 2.96
Storage Volume,Vs=Qp-10(acre-ft) 0.25
Runoff,Q(in) 5.72
Runoff Volume,Vr(acre-ft)=(Q/12)*A 0.73
VS/Vr 0.347
Z5go/q; 0.355
Peak Outflow Discharge,Qf100,(cfs)=qi*(q0/qi) 2.61
Post-Development Peak Discharge 2.61 cfs<Pre-Development Peak Discharge 2.96 cfs; OK
8 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Figure 6-1,page 6-2
3of3
Chapter 2 Estimating Runoff Technical Release 55
Urban Hydrology for Small Watersheds
Table 2-2a Runoff curve numbers for urban areas 1/
Curve numbers for
------------------------------------------- Cover description ----------------------------------------- -----------hydrologic soil group-------------
Average percent
Cover type and hydrologic condition impervious area 2/ A B C D
Fully developed urban areas (vegetation established)
Open space(lawns,parks,golf courses,cemeteries,etc.)3/:
Poor condition(grass cover<50%).......................................... 68 86 89
Fair condition(grass cover 50%to 759/6) .................................. 49 79 84
69
Good condition(grass cover>75%)......................................... 39 74 80
Impervious areas:
Paved parking lots,roofs,driveways,etc.
(excluding right-of-way)............................................................. 98 98 98 98
Streets and roads:
Paved;curbs and storm sewers(excluding
right-of-way) ................................................................................ 98 98 98 98
Paved;open ditches(including right-of-way).......................... 83 89 92 93
Gravel(including right-of-way)................................................. 76 85 89 91
Dirt(including right-of-way)...................................................... 72 82 87 89
Western desert urban areas:
Natural desert landscaping(pervious areas only) 4i..................... 63 77 85 88
Artificial desert landscaping(impervious weed barrier,
desert shrub with 1-to 2-inch sand or gravel mulch
and basin borders) ...................................................................... 96 96 96 96
Urban districts:
Commercial and business................................................................. 85 89 92 94 95
Industrial............................................................................................. 72 81 88 91 93
Residential districts by average lot size:
1/8 acre or less(town houses).......................................................... 65 77 85 90 92
1/4 acre ................................................................................................ 38 61 75 83 87
1/3 acre ................................................................................................ 30 57 72 81 86
1/2 acre ................................................................................................ 25 54 70 80 85
1 acre ................................................................................................... 20 51 68 79 84
2 acres.................................................................................................. 12 46 65 77 82
Developing urban areas
Newly graded areas
(pervious areas only,no vegetation)5/................................................................ 77 86 91 94
Idle lands(CN's are determined using cover types
similar to those in table 2-2c).
1 Average runoff condition,and Ia=0.2S.
2 The average percent impervious area shown was used to develop the composite CN's.Other assumptions are as follows:impervious areas are
directly connected to the drainage system,impervious areas have a CN of 98,and pervious areas are considered equivalent to open space in
good hydrologic condition.CN's for other combinations of conditions may be computed using figure 2-3 or 2-4.
3 CN's shown are equivalent to those of pasture.Composite CN's may be computed for other combinations of open space
cover type.
4 Composite CN's for natural desert landscaping should be computed using figures 2-3 or 2-4 based on the impervious area percentage
(CN=98)and the pervious area CN.The pervious area CN's are assumed equivalent to desert shrub in poor hydrologic condition.
5 Composite CN's to use for the design of temporary measures during grading and construction should be computed using figure 2-3 or 2-4
based on the degree of development(impervious area percentage)and the CN's for the newly graded pervious areas.
(210-VI-TR-55,Second Ed.,June 1986) 2-5
Chapter 2 Estimating Runoff Technical Release 55
Urban Hydrology for Small Watersheds
Table 2-2c Runoff curve numbers for other agricultural lands li
Curve numbers for
--------------------------------------- Cover description -------------------------------------- - hydrologic soil group
----------- ---------------
Hydrologic
Cover type condition A B C D
Pasture,grassland,or range—continuous Poor 68 79 86 89
forage for grazing.2/ Fair 49 69 79 84
Good 39 61 74 80
Meadow—continuous grass,protected from — 30 58 71 78
grazing and generally mowed for hay.
Brush—brush-weed-grass mixture with brush Poor 48 67 77 83
the major element.3i Fair 35 56 70 77
Good 30 4/ 48 65 73
Woods—grass combination(orchard Poor 57 73 82 86
or tree farm).Ji Fair 43 65 76 82
Good 32 58 72 79
Woods.6/ Poor 45 77 83
Fair 36 60 73 79
Good 30 4/ 70 77
Farmsteads—buildings,lanes,driveways, — 59 74 82 86
and surrounding lots.
1 Average runoff condition,and Ia=0.25.
2 Poor: <50%)ground cover or heavily grazed with no mulch.
Fair: 50 to 75%ground cover and not heavily grazed.
Good.• >75%ground cover and lightly or only occasionally grazed.
3 Poor. <50%ground cover.
Fair: 50 to 75%ground cover.
Good.• >75%ground cover.
4 Actual curve number is less than 30;use CN=30 for runoff computations.
5 CN's shown were computed for areas with 50%woods and 50%grass(pasture)cover.Other combinations of conditions may be computed
from the CN's for woods and pasture.
6 Poor: Forest litter,small trees,and brush are destroyed by heavy grazing or regular burning.
Fair: Woods are grazed but not burned,and some forest litter covers the soil.
Good.• Woods are protected from grazing,and litter and brush adequately cover the soil.
(210-VI-TR-55,Second Ed.,June 1986) 2-7
Chapter 3 Time of Concentration and Travel Time Technical Release 55
Urban Hydrology for Small Watersheds
Sheet flow For sheet flow of less than 300 feet,use Manning's
kinematic solution(Overtop and Meadows 1976)to
Sheet flow is flow over plane surfaces. It usually compute Tt:
occurs in the headwater of streams. With sheet flow, 08
the friction value(Manning's n)is an effective rough- _ 0.007(nL) *-
ness coefficient that includes the effect of raindrop Tt P2)0.5SO.4 [eq. 3-3]
impact; drag over the plane surface; obstacles such as
litter, crop ridges,and rocks; and erosion and trans- where:
portation of sediment.These n values are for very
shallow flow depths of about 0.1 foot or so. Table 3-1 Tt = travel time (hr),
gives Manning's n values for sheet flow for various n = Manning's roughness coefficient(table 3-1)
surface conditions. L = flow length(ft)
P2 = 2-year, 24-hour rainfall(in)
s = slope of hydraulic grade line
Table 3-1 Roughness coefficients(Manning's n)for (land slope,ft/ft)
sheet flow
This simplified form of the Manning's kinematic solu-
Surface description n 1/ tion is based on the following: (1) shallow steady
uniform flow, (2)constant intensity of rainfall excess
Smooth surfaces(concrete,asphalt, (that part of a rain available for runoff), (3)rainfall
gravel,or bare soil) 0.011 duration of 24 hours, and(4)minor effect of infiltra-
Fallow(no residue) 0.05 tion on travel time. Rainfall depth can be obtained
..................................................
Cultivated soils: from appendix B.
Residue cover<_20%......................................... 0.06
Residue cover>20/0 0.17 Shallow concentrated flow
Grass:
Short grass prairie............................................ 0.15 After a maximum of 300 feet, sheet flow usually be-
Dense grasses 2i ....................... 0.24 comes shallow concentrated flow. The average veloc-
.........................
Bermuda rass 0.41 ity for this flow can be determined from figure 3-1,in
Range natural 0.13 which average velocity is a function of watercourse
Woods:-
3, slope and type of channel. For slopes less than 0.005
Light underbrush.............................................. 0.40 ft/ft,use equations given in appendix F for figure 3-1.
Dense underbrush............................................ 0.80
Tillage can affect the direction of shallow concen-
trated flow. Flow may not always be directly down the
1 The n values are a composite of information compiled by Engman watershed slope if tillage runs across the slope.
(1986).
2 Includes species such as weeping lovegrass,bluegrass,buffalo
grass,blue grama grass,and native grass mixtures. After determining average velocity in figure 3-1,use
3 When selecting n,consider cover to a height of about 0.1 ft.This equation 3-1 to estimate travel time for the shallow
is the only part of the plant cover that will obstruct sheet flow. concentrated flow segment.
Open channels
Open channels are assumed to begin where surveyed
cross section information has been obtained,where
channels are visible on aerial photographs, or where
blue lines(indicating streams) appear on United States
Geological Survey(USGS)quadrangle sheets.
Manning's equation or water surface profile informa-
tion can be used to estimate average flow velocity.
Average flow velocity is usually determined for bank-
full elevation.
(210-VI-TR-55,Second Ed.,June 1986) 3-3
Chapter 3 Time of Concentration and Travel Time Technical Release 55
Urban Hydrology for Small Watersheds
Figure 3-1 Average velocities for estimating travel time for shallow concentrated flow
.50
9
.20 AF
.10 -
Q - -
o - -
�' .06 -
a�
L
0 a
M .04
.02
Post-,1-Yr,10-Yr,&
100-Yr
.01
Pre-,1-Yr,10-Yr,&
100-Yr
.005 -
1 2 4 6 10 20
Average velocity(ft/sec)
3-2 (210-VI-TR-55,Second Ed.,June 1986)
Chapter 4 Graphical Peak Discharge Method
This chapter presents the Graphical Peak Discharge Figure 4-1 Variation of Ia/P for P and CN
method for computing peak discharge from rural and
urban areas.The Graphical method was developed 1.0
from hydrograph analyses using TR-20, "Computer
Program for Project Formulation Hydrology" 0.8
(SCS 1983).The peak discharge equation used is:
qp = quAmQFp [eq. 4-1] a 0.6
c�
CN = 40
where: 0.4 50
60
qp = peak discharge(cfs) 70
0.2 80
%= unit peak discharge (csm/in) 9-0-
AM= drainage area(mil)
Q = runoff(in) 0 g 11 1
Fp= pond and swamp adjustment factor 1 3 5 7 3 15
Rainfall (P), inches
The input requirements for the Graphical method are
as follows: (1)Tc(hr), (2)drainage area(mi2), (3) Table 4-1 Ia values for runoff curve numbers
appropriate rainfall distribution(I, 1A,II, or III), (4)
24-hour rainfall(in), and(5) CN. If pond and swamp
areas are spread throughout the watershed and are not Curve Ia Curve Ia
considered in the TC computation, an adjustment for number (in) number (in)
pond and swamp areas is also needed. 40......................3.000 70......................0.857
41......................2.878 71 ......................0.817
Peak discharge computation 42......................2.762 72......................0.778
43......................2.651 73......................0.740
For a selected rainfall frequency,the 24-hour rainfall 44......................2.545 74......................0.703
(P)is obtained from appendix B or more detailed local 45......................2.444 75......................0.667
precipitation maps. CN and total runoff(Q)for the 46......................2.348 76......................0.632
watershed are computed according to the methods 47......................2.255 77......................0.597
48......................2.167 78......................0.564
outlined in chapter 2. The CN is used to determine the 49 2.082 79 0.532
...................... ......................
initial abstraction(Ia)from table 4-1. Ia/P is then 50 ....2.000 80......................0.500
computed. 51...................... 1.922 81......................0.469
52...................... 1.846 82......................0.439
If the computed Ia/P ratio is outside the range in 53...................... 1.774
exhibit 4(4-I,4-IA,4-II, and 4-III)for the rainfall distri- 54...................... 1.704 84......................0.381
bution of interest,then the limiting value should be 55...................... 1.636 85......................0.353
used. If the ratio falls between the limiting values,use 56...................... 1.571 86......................0.326
linear interpolation. Figure 4-1 illustrates the sensitiv- 57...................... 1.509 87......................0.299
ity of Ia/P to CN and P. 58...................... 1.448 88......................0.273
59...................... 1.390 89......................0.247
60---------------------- 1.333 90......................0.222
Peak discharge per square mile per inch of runoff(qu)
61...................... 1.279 91......................0.198
is obtained from exhibit 4-I,4-IA1 4-II, or 4-III by using 162 . 1.226 92 0.174
..................
Tc(chapter 3),rainfall distribution type, and Ia/P 63 .... 1.175 93 0.151
ratio. The pond and swamp adjustment factor is ob- 64...................... 1.125 94......................0.128
tained from table 4-2 (rounded to the nearest table 65...................... 1.077 95......................0.105
value).Use worksheet 4 in appendix D to aid in com- 66...................... 1.030 96......................0.083
puting the peak discharge using the Graphical method. 67......................0.985 97......................0.062
68......................0.941 98......................0.041
69......................0.899
(210-VI-TR-55,Second Ed.,June 1986) 4-1
Chapter 4 Graphical Peak Dischage Method Technical Release 55
Urban Hydrology for Small Watersheds
Exhibit 4-III Unit peal discharge(qu)for NRCS(SCS)type III rainfall distribution
700
600 Area C-Post-,10-Yr
(0.11 535)
Area C-Post-,10-Yr
500 (0.11 534)
Area C-Post-,1-Yr:
(0.21,500) Area C-Pre-,100-Yr:
400 (0.16,310)
d�A
O Area C-Pre-,10-Yr:
300 (0.25,290)
•3
S
O Area C-Pre-,1-Yr:
0 4S (0.47,180)
200 oso
100
80
60
40
.1 .2 .4 .6 .8 1 2 4 6 8 10
Time of concentration (Td, (hours)
(210-VI-TR-55,Second Ed.,June 1986) 4-7
Chapter 4 Graphical Peak Dischage Method Technical Release 55
Urban Hydrology for Small Watersheds
Table 4-2 Adjustment factor(Fp)for pond and swamp • When this method is used to develop estimates of
areas that are spread throughout the peak discharge for both present and developed
watershed
conditions of a watershed,use the same procedure
for estimating T,
Percentage of pond
and swamp areas Fp • TC values with this method may range from 0.1 to
10 hours.
0..................................................... 1.00
0.2..................................................0.97
1.0..................................................0.87 Example 4-1
3.0..................................................0.75
5.0..................................................0.72 Compute the 25-year peak discharge for the 250-acre
watershed described in examples 2-2 and 3-1. Figure 4-
Limitations 2 shows how worksheet 4 is used to compute qp as
345 cfs.
The Graphical method provides a determination of
peak discharge only.If a hydrograph is needed or
watershed subdivision is required,use the Tabular
Hydrograph method(chapter 5). Use TR-20 if the
watershed is very complex or a higher degree of
accuracy is required.
• The watershed must be hydrologically homoge-
neous,that is, describable by one CN.Land use,
soils, and cover are distributed uniformly through-
out the watershed.
• The watershed may have only one main stream or,
if more than one,the branches must have nearly
equal Tc' s.
• The method cannot perform valley or reservoir
routing.
• The Fp factor can be applied only for ponds or
swamps that are not in the TC flow path.
• Accuracy of peak discharge estimated by this
method will be reduced if Ia/P values are used that
are outside the range given in exhibit 4.The limit-
ing Ia/P values are recommended for use.
• This method should be used only if the weighted
CN is greater than 40.
4-2 (210-VI-TR-55,Second Ed.,June 1986)
Chapter 6 Storage Volume for Detention Basins Technical Release 55
Urban Hydrology for Small Watersheds
Input requirements and Estimating VS
procedures
Use worksheet 6a to estimate VS, storage volume
Use figure 6-1 estimate storage volume(VS)required or required,by the following procedure.
peak outflow discharge(qo).The most frequent appli-
cation is to estimate VS,for which the required inputs 1. Determine qo. Many factors may dictate the selec-
are runoff volume (Vr), qo, and peak inflow discharge tion of peak outflow discharge. The most common
(qi). To estimate qo,the required inputs are Vr,VS, is to limit downstream discharges to a desired
and qi. level, such as predevelopment discharge.Another
factor may be that the outflow device has already
been selected.
2. Estimate qi by procedures in chapters 4 or 5. Do
not use peak discharges developed by other proce-
dure. When using the Tabular Hydrograph method
to estimate ql for a subarea, only use peak dis-
charge associated with Tt=0.
Figure 6-1 Approximate detention basin routing for rainfall types I,IA,II,and III
.6
el Post-Area C,10-Yr
.5
N'
SON[ Post-Area C,100-Yr
> > .4
(D 0)
E E
5 T
0 0
a�
0
o .3
.2 �
Nunn N�
.1
.1 .2 .3 .4 .5 .6 .7 .8
Peak outflow discharge qo
Peak inflow a,
discharge i
6-2 (210-VI-TR-55,Second Ed.,June 1986)
PACIC
CLIENT DRIVEN SOLUTIONS
AREA D
P.W.GROSSER CONSULTING,INC•P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
631.589.6353 •WWW.PWGROSSER.COM•PWGC.INFO@a PWGROSSER.COM
BOHEMIA • MANHATTAN • SARATOGA SPRINGS • SYRACUSE • SHELTON, CT
Appendix H
Water Quantity Volume Calculations
Drainage Area D
Proiect:AVG 1803
Location:56655 Route 25,Southold,NY 11971
Condition:Pre-Developed-Drainage Area D
Runoff Curve Number
Soil Name&Hydrologic Group
Cover Description 1 Curve Number Area(AC) Area(%) Product of CN x
Soil Classification HSG(HYDROLOGIC (CN) Area
SOIL GROUP)
Riverhead Sandy Loam(HaA) B Impervious Area 98 0.15 16% 15.64
Riverhead Sandy Loam(HaA) B Open space,Fair Condition 69 0.79 84% 57.99
Totals= 0.94 100% 73.63
CN(weighted)=total product/total area= 73.63 Use CN 4174
Runoff
Storm#1 Storm#2 Storm#3
Frequency(yr) 1 10 100
$Rainfall,P(24-hour) 2.84 5.44 8.54
S=1000/CN-10 3.58 3.58 3.58
Runoff,Q(in)=(P-0.2S)2/(P+0.8S) 0.79 2.69 5.37
Time of Concentration(TJ
Sheet Flow Storm#1 Storm#2 Storm#3
Segment ID 1a 1b 1a 1b 1a 1b
Z Surface Description Smooth Surfaces Grass Smooth Surfaces Grass Smooth Surfaces Grass
Z Manning's Roughness coefficient(Weighted),n 0.011 0.150 0.011 0.150 0.011 0.150
3 Flow Length,L 12 138 12 138 12 138
8Rainfall,P(2-Yr,24-Hr) 3.490 3.490 3.490 3.490 3.490 3.490
3 Land slope,s 0.009 0.001 0.009 0.001 0.009 0.001
Tt(Sheet Flow)=(0.007*(n*L)o.$)/(PO.s*so.4) 0.005 0.671 0.005 0.671 0.005 0.671
Total Tt(Sheet Flow)= 0.68 0.68 0.68
Shallow Concentrated Flow Storm#1 Storm#2 Storm#3
2a 2a 2a
Surface Description Paved Paved Paved
3 Flow Length,L(ft) 142 142 142
3 Watercourse slope,s 0.003 0.003 0.003
4 Average velocity,V(ft/s) 1.42 1.42 1.42
Tt(Shallow Concentrated Flow)=L/(3600*V) 0.03 0.03 0.03
Total Tt(Shallow Concentrated Flow)= 0.03 1 0.03 1 0.03
Watershed Tc(hr)=Tt_5C+Total Tt-sCF 0.70 0.70 0.70
Graphical Peak Discharge Method
Storm#1 Storm#2 Storm#3
Drainage Area,Ar,(mil) 0.0015 0.0015 0.0015
Runoff Curve Number,CN 74 74 74
Time of Concentration,Tc(hr) 0.70 0.70 0.70
Rainfall Distribution(TYPE III-Atlantic Coastal Areas) III III III
Pond and Swamp area spread throughout watershed 0 0 0
Frequency(yr) 1 10 100
Rainfall,P(24-hour) 2.84 5.44 8.54
5 Initial abstraction,la(in) 0.703 0.703 0.703
Compute I a/P 0.25 0.13 0.08 I Use 0.10
6 Unit peak discharge,qu(csm/in) 307 335 350
Runoff,Q(in) 0.790 2.69 5.37
Pond and Swamp adjustment factor,Fp 1 1 1
Peak discharge,qp(ft3/s)=qu*Am*Q*FP 0.36 1.32 2.76
1 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 2-2,page 2-5&2-7
Z United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 3-1,page 3-3
3 Refer to the attached FIGURE-1&2 for Pre and Post-Development Flow Lengths
4 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Figure 3-1,page 3-2
5 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 4-1,page 4-1
6 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-SS,1986,Exhibit 4-III,page 4-7
United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 4-2,page 4-2
8 NOAA Atlas 14,Volume 10,Version 3.Point Precipitation Frequency(PF)Estimates With 90%Confidence Intervals and Supplementary Information
1of3
Appendix H
Water Quantity Volume Calculations
Drainage Area D
Proiect: AVG 1803
Location:56655 Route 25,Southold,NY 11971
Condition:Post-Developed-Drainage Area D
Runoff Curve Number
Soil Name&Hydrologic Group
Cover Description 1 Curve Number Area(AC) Area(%) Product of CN x
Soil Classification HSG(HYDROLOGIC (CN) Area
SOIL GROUP)
Riverhead Sandy Loam(HaA) B Impervious Area 98 0.45 48% 46.91
Riverhead Sandy Loam(HaA) B Open space,Fair Condition 169 0.49 152% 35.97
Totals= 0.94 1 100% 82.88
CN(weighted)=total product/total area= 82.88 Use CN 4183
Runoff
Storm#1 Storm#2 Storm#3
Frequency(yr) 1 10 100
$Rainfall,P(24-hour) 2.84 5.44 8.54
S=1000/CN-10 2.07 2.07 2.07
Runoff,Q(in)=(P-0.2S)2/(P+0.8S) 1.31 3.56 6.48
Time of Concentration(TJ
Sheet Flow Storm#1 Storm#2 Storm#3
Segment ID 1a 1b 1a 1b 1a 1b
Z Surface Description Smooth Surfaces Grass Smooth Surfaces Grass Smooth Surfaces Grass
Z Manning's Roughness coefficient(Weighted),n 0.011 0.15 0.011 0.15 0.011 0.15
3 Flow Length,L 88 12 88 12 88 12
8Rainfall,P(2-Yr,24-Hr) 3.490 3.490 3.490 3.490 3.490 3.490
3Land slope,s 0.010 0.010 0.010 0.010 0.010 0.010
Tt(Sheet Flow)=(0.007*(n*L)o.$)/(PO.s*so.4) 0.02 0.04 0.02 0.04 0.02 0.04
Total Tt(Sheet Flow)= 0.06 0.06 0.06
Shallow Concentrated Flow Storm#1 Storm#2 Storm#3
Segment ID 2a 2a 2a
Surface Description Paved Paved Paved
3 Flow Length,L 143 144 144
3 Watercourse slope,s 0.010 0.010 0.010
4 Average velocity,V 2.02 2.02 2.02
Tt(Shallow Concentrated Flow)=L/(3600*V) 0.02 0.02 0.02
Total Tt(Shallow Concentrated Flow)= 0.02 0.02 0.02
Watershed r =I t_sc+Total Tt-sCF 0.08 0.08 0.08
Graphical Peak Discharge Method
Storm#1 Storm#2 Storm#3
Drainage Area,A,,,(mil) 0.0015 0.0015 0.0015
Runoff Curve Number,CN 83 83 83
Time of Concentration,Tc(hr) 0.08 I Use 0.10 0.08 I Use 0.10 0.08 I Use 0.10
Rainfall Distribution(TYPE III-Atlantic Coastal Areas) III III III
Pond and Swamp area spread throughout watershed 0 0 0
Frequency(yr) 1 10 100
Rainfall,P(24-hour) 2.84 5.44 8.54
5 Initial abstraction,la(in) 0.410 0.410 0.410
Compute 1,/P 0.14 0.08 I Use 0.10 0.05 I Use 0.10
6 Unit peak discharge,qu(csm/in) 650 655 655
Runoff,Q(in) 1.311 3.56 6.48
Pond and Swamp adjustment factor,Fp 1 1 1
Peak discharge,qp(ft3/s)=qu*Am*Q*FP 1.25 3.43 6.23
1 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 2-2,page 2-5&2-7
Z United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 3-1,page 3-3
3 Refer to the attached FIGURE-1&2 for Pre and Post-Development Flow Lengths
4 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Figure 3-1,page 3-2
5 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 4-1,page 4-1
6 United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Exhibit 4-111,page 4-7
United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Table 4-2,page 4-2
8 NOAA Atlas 14,Volume 10,Version 3.Point Precipitation Frequency(PF)Estimates With 90%Confidence Intervals and Supplementary Information
2of3
Appendix H
Water Quantity Volume Calculations
Drainage Area D
Project:AVG1803
Location:56655 Route 25,Southold, NY 11971
Runoff Reduction(RRv)
RRv=Reduction of the total WQv by application of green infrastructure techniques and SMPs to replicate
pre-development hydrology.
WQV= 0.09 acre-ft
100%WQV= 0.09 acre-ft
1-100%of the RRv will be provided by Infiltration Practices
Vs= 0.15 acre-ft provided
Channel Protection Volume(Cps,)-1-year,24-hour storm event(see note below)
Runoff Curve Number,CN
Initial abstraction,la(in)
Time of Concentration,Tc(hr)
6 Unit peak discharge,qu(csm/in)-1-year,24-hr Storm Event of the post development
g Peak Outflow Discharge/Peak Inflow Discharge(qo/q;)
g Vs/Vr=0.682-1.43(go/qi)+1.64(go/q;)2-0.804(go/q;)3
Runoff,Qd(in)
Total Drainage Area(acres)
CpV=Vs=(Vs/VMQ)(A)/12(acre-ft)
CpV=ft 3
Average Release Rate= Not required for Infiltration Practices or Tidal Discharge
Note: Cpv requirements do not apply when the reduction of the entire Cpv volume is achieved through an infiltration system
or if the site discharges directly to tidal waters.
Overbank Flood Protection Volume(QpLO)-10-year,24-hour storm
Post-Developed Peak Flow,q;(ft3/s) 3.43
Pre-Developed Peak Flow(Peak Inflow Discharge),qo(ft3/s) 1.32
Storage Volume,Vs=Qp-10(acre-ft) 0.15
Runoff,Q(in) 3.56
Runoff Volume,Vr(acre-ft)=(Q/12)*A 0.28
Vs/Vr 0.554
gqo/q; 0.110
Peak Outflow Discharge,Qp10,(cfs)=qi*(q0/qi) 0.38
Post-Development Peak Discharge 0.38 cfs< Pre-Development Peak Discharge 1.32 cfs; OK
Extreme Flood Protection Volume(4)100-year,24-hour storm
Post-Developed Peak Flow,q;(ft3/s) 6.23
Pre-Developed Peak Flow(Peak Inflow Discharge),qo(ft3/s) 2.76
Storage Volume,Vs=Qp-10(acre-ft) 0.15
Runoff,Q(in) 6.48
Runoff Volume,Vr(acre-ft)=(Q/12)*A 0.51
Vs/Vr 0.305
gqo/q; 0.440
Peak Outflow Discharge,Qf100,(cfs)=qi*(q0/qi) 2.74
Post-Development Peak Discharge 2.74 cfs<Pre-Development Peak Discharge 2.76 cfs;OK
g United States Department of Agriculture,Urban Hydrology for Small Watersheds-TR-55,1986,Figure 6-1,page 6-2
3of3
Chapter 2 Estimating Runoff Technical Release 55
Urban Hydrology for Small Watersheds
Table 2-2a Runoff curve numbers for urban areas 1/
Curve numbers for
------------------------------------------- Cover description ----------------------------------------- -----------hydrologic soil group-------------
Average percent
Cover type and hydrologic condition impervious area 2/ A B C D
Fully developed urban areas (vegetation established)
Open space(lawns,parks,golf courses,cemeteries,etc.)3/:
Poor condition(grass cover<50%).......................................... 68 86 89
Fair condition(grass cover 50%to 759/6) .................................. 49 79 84
69
Good condition(grass cover>75%)......................................... 39 74 80
Impervious areas:
Paved parking lots,roofs,driveways,etc.
(excluding right-of-way)............................................................. 98 98 98 98
Streets and roads:
Paved;curbs and storm sewers(excluding
right-of-way) ................................................................................ 98 98 98 98
Paved;open ditches(including right-of-way).......................... 83 89 92 93
Gravel(including right-of-way)................................................. 76 85 89 91
Dirt(including right-of-way)...................................................... 72 82 87 89
Western desert urban areas:
Natural desert landscaping(pervious areas only) 4i..................... 63 77 85 88
Artificial desert landscaping(impervious weed barrier,
desert shrub with 1-to 2-inch sand or gravel mulch
and basin borders) ...................................................................... 96 96 96 96
Urban districts:
Commercial and business................................................................. 85 89 92 94 95
Industrial............................................................................................. 72 81 88 91 93
Residential districts by average lot size:
1/8 acre or less(town houses).......................................................... 65 77 85 90 92
1/4 acre ................................................................................................ 38 61 75 83 87
1/3 acre ................................................................................................ 30 57 72 81 86
1/2 acre ................................................................................................ 25 54 70 80 85
1 acre ................................................................................................... 20 51 68 79 84
2 acres.................................................................................................. 12 46 65 77 82
Developing urban areas
Newly graded areas
(pervious areas only,no vegetation)5/................................................................ 77 86 91 94
Idle lands(CN's are determined using cover types
similar to those in table 2-2c).
1 Average runoff condition,and Ia=0.2S.
2 The average percent impervious area shown was used to develop the composite CN's.Other assumptions are as follows:impervious areas are
directly connected to the drainage system,impervious areas have a CN of 98,and pervious areas are considered equivalent to open space in
good hydrologic condition.CN's for other combinations of conditions may be computed using figure 2-3 or 2-4.
3 CN's shown are equivalent to those of pasture.Composite CN's may be computed for other combinations of open space
cover type.
4 Composite CN's for natural desert landscaping should be computed using figures 2-3 or 2-4 based on the impervious area percentage
(CN=98)and the pervious area CN.The pervious area CN's are assumed equivalent to desert shrub in poor hydrologic condition.
5 Composite CN's to use for the design of temporary measures during grading and construction should be computed using figure 2-3 or 2-4
based on the degree of development(impervious area percentage)and the CN's for the newly graded pervious areas.
(210-VI-TR-55,Second Ed.,June 1986) 2-5
Chapter 2 Estimating Runoff Technical Release 55
Urban Hydrology for Small Watersheds
Table 2-2c Runoff curve numbers for other agricultural lands li
Curve numbers for
--------------------------------------- Cover description -------------------------------------- - hydrologic soil group
----------- ---------------
Hydrologic
Cover type condition A B C D
Pasture,grassland,or range—continuous Poor 68 79 86 89
forage for grazing.2/ Fair 49 69 79 84
Good 39 61 74 80
Meadow—continuous grass,protected from — 30 58 71 78
grazing and generally mowed for hay.
Brush—brush-weed-grass mixture with brush Poor 48 67 77 83
the major element.3i Fair 35 56 70 77
Good 30 4/ 48 65 73
Woods—grass combination(orchard Poor 57 73 82 86
or tree farm).Ji Fair 43 65 76 82
Good 32 58 72 79
Woods.6/ Poor 45 77 83
Fair 36 60 73 79
Good 30 4/ 70 77
Farmsteads—buildings,lanes,driveways, — 59 74 82 86
and surrounding lots.
1 Average runoff condition,and Ia=0.25.
2 Poor: <50%)ground cover or heavily grazed with no mulch.
Fair: 50 to 75%ground cover and not heavily grazed.
Good.• >75%ground cover and lightly or only occasionally grazed.
3 Poor. <50%ground cover.
Fair: 50 to 75%ground cover.
Good.• >75%ground cover.
4 Actual curve number is less than 30;use CN=30 for runoff computations.
5 CN's shown were computed for areas with 50%woods and 50%grass(pasture)cover.Other combinations of conditions may be computed
from the CN's for woods and pasture.
6 Poor: Forest litter,small trees,and brush are destroyed by heavy grazing or regular burning.
Fair: Woods are grazed but not burned,and some forest litter covers the soil.
Good.• Woods are protected from grazing,and litter and brush adequately cover the soil.
(210-VI-TR-55,Second Ed.,June 1986) 2-7
Chapter 3 Time of Concentration and Travel Time Technical Release 55
Urban Hydrology for Small Watersheds
Sheet flow For sheet flow of less than 300 feet,use Manning's
kinematic solution(Overtop and Meadows 1976)to
Sheet flow is flow over plane surfaces. It usually compute Tt:
occurs in the headwater of streams. With sheet flow, 08
the friction value(Manning's n)is an effective rough- _ 0.007(nL) *-
ness coefficient that includes the effect of raindrop Tt P2)0.5SO.4 [eq. 3-3]
impact; drag over the plane surface; obstacles such as
litter, crop ridges,and rocks; and erosion and trans- where:
portation of sediment.These n values are for very
shallow flow depths of about 0.1 foot or so. Table 3-1 Tt = travel time (hr),
gives Manning's n values for sheet flow for various n = Manning's roughness coefficient(table 3-1)
surface conditions. L = flow length(ft)
P2 = 2-year, 24-hour rainfall(in)
s = slope of hydraulic grade line
Table 3-1 Roughness coefficients(Manning's n)for (land slope,ft/ft)
sheet flow
This simplified form of the Manning's kinematic solu-
Surface description n 1/ tion is based on the following: (1) shallow steady
uniform flow, (2)constant intensity of rainfall excess
Smooth surfaces(concrete,asphalt, (that part of a rain available for runoff), (3)rainfall
ravel or bare soil).......................................... 0.011 duration of 24 hours, and(4)minor effect of infiltra-
Fallow(no residue) 0.05 tion on travel time. Rainfall depth can be obtained
Cultivated soils: from appendix B.
Residue cover<_20%......................................... 0.06
Residue cover>20/0 0.17 Shallow concentrated flow
Grass:
Short grass prairie............................................ 0.15 After a maximum of 300 feet, sheet flow usually be-
Dense grasses 2i ....................... 0.24 comes shallow concentrated flow. The average veloc-
.........................
Bermuda rass 0.41 ity for this flow can be determined from figure 3-1,in
e Ran natural 0.13 which average velocity is a function of watercourse
Woods:3� p � p
g ) slope and type of channel. For slopes less than 0.005
Light underbrush.............................................. 0.40 ft/ft,use equations given in appendix F for figure 3-1.
Dense underbrush............................................ 0.80
Tillage can affect the direction of shallow concen-
trated flow. Flow may not always be directly down the
1 The n values are a composite of information compiled by Engman watershed slope if tillage runs across the slope.
(1986).
2 Includes species such as weeping lovegrass,bluegrass,buffalo
grass,blue grama grass,and native grass mixtures. After determining average velocity in figure 3-1,use
3 When selecting n,consider cover to a height of about 0.1 ft.This equation 3-1 to estimate travel time for the shallow
is the only part of the plant cover that will obstruct sheet flow. concentrated flow segment.
Open channels
Open channels are assumed to begin where surveyed
cross section information has been obtained,where
channels are visible on aerial photographs, or where
blue lines(indicating streams) appear on United States
Geological Survey(USGS)quadrangle sheets.
Manning's equation or water surface profile informa-
tion can be used to estimate average flow velocity.
Average flow velocity is usually determined for bank-
full elevation.
(210-VI-TR-55,Second Ed.,June 1986) 3-3
Chapter 3 Time of Concentration and Travel Time Technical Release 55
Urban Hydrology for Small Watersheds
Figure 3-1 Average velocities for estimating travel time for shallow concentrated flow
.50
9
.20 AF
.10 -
Q - -
o - -
�' .06 -
a�
L
0 a
M .04
.02
Post-,1-Yr,10-Yr,&
100-Yr
I
.01
AA
Pre-,1-Yr,10-Yr,&
100-Yr
.005 -
1 2 4 6 10 20
Average velocity(ft/sec)
3-2 (210-VI-TR-55,Second Ed.,June 1986)
Chapter 4 Graphical Peak Discharge Method
This chapter presents the Graphical Peak Discharge Figure 4-1 Variation of Ia/P for P and CN
method for computing peak discharge from rural and
urban areas.The Graphical method was developed 1.0
from hydrograph analyses using TR-20, "Computer
Program for Project Formulation Hydrology" 0.8
(SCS 1983).The peak discharge equation used is:
qp = quAmQFp [eq. 4-1] a 0.6
c�
CN = 40
where: 0.4 50
60
qp = peak discharge(cfs) 70
0.2 80
%= unit peak discharge (csm/in) 9-0-
AM= drainage area(mil)
Q = runoff(in) 0 g 11 1
Fp= pond and swamp adjustment factor 1 3 5 7 3 15
Rainfall (P), inches
The input requirements for the Graphical method are
as follows: (1)Tc(hr), (2)drainage area(mi2), (3) Table 4-1 Ia values for runoff curve numbers
appropriate rainfall distribution(I, 1A,II, or III), (4)
24-hour rainfall(in), and(5) CN. If pond and swamp
areas are spread throughout the watershed and are not Curve Ia Curve Ia
considered in the TC computation, an adjustment for number (in) number (in)
pond and swamp areas is also needed. 40......................3.000 70......................0.857
41......................2.878 71 ......................0.817
Peak discharge computation 42......................2.762 72......................0.778
43......................2.651 73......................0.740
For a selected rainfall frequency,the 24-hour rainfall 44......................2.545 174......................0.703
(P)is obtained from appendix B or more detailed local 45......................2.444 75......................0.667
precipitation maps. CN and total runoff(Q)for the 46......................2.348 76......................0.632
watershed are computed according to the methods 47......................2.255 77......................0.597
48......................2.167 78......................0.564
outlined in chapter 2. The CN is used to determine the 49 2.082 79 0.532
...................... ......................
initial abstraction(Ia)from table 4-1. Ia/P is then 50 ....2.000 80......................0.500
computed. 51...................... 1.922 81......................0.469
52...................... 1.846 82......................0.439
If the computed Ia/P ratio is outside the range in 53...................... 1.774 83......................0.410
exhibit 4(4-I,4-IA,4-II, and 4-III)for the rainfall distri- 54...................... 1.704 84......................0.381
bution of interest,then the limiting value should be 55...................... 1.636 85......................0.353
used. If the ratio falls between the limiting values,use 56...................... 1.571 86......................0.326
linear interpolation. Figure 4-1 illustrates the sensitiv- 57...................... 1.509 87......................0.299
ity of Ia/P to CN and P. 58...................... 1.448 88......................0.273
59...................... 1.390 89......................0.247
60---------------------- 1.333 90......................0.222
Peak discharge per square mile per inch of runoff(qu)
61...................... 1.279 91......................0.198
is obtained from exhibit 4-I,4-IA1 4-II, or 4-III by using 62 1.226 92 0.174
...................... ......................
Tc(chapter 3),rainfall distribution type, and Ia/P 63 .... 1.175 93 0.151
.................. ......................
ratio. The pond and swamp adjustment factor is ob- 64...................... 1.125 94......................0.128
tained from table 4-2 (rounded to the nearest table 65...................... 1.077 95......................0.105
value).Use worksheet 4 in appendix D to aid in com- 66...................... 1.030 96......................0.083
puting the peak discharge using the Graphical method. 67......................0.985 97......................0.062
68......................0.941 98......................0.041
69......................0.899
(210-VI-TR-55,Second Ed.,June 1986) 4-1
Chapter 4 Graphical Peak Dischage Method Technical Release 55
Urban Hydrology for Small Watersheds
Exhibit 4-III Unit peal discharge(qu)for NRCS(SCS)type III rainfall distribution
700
Area C-Post-,10-Yr&100-Yr
600 (0.10,655)
Area D-Pre-,100-Yr:
Area D-Post-,1-Yr: (0.10,350)
500 (0.14,650)
Area D-Pre-,10-Yr:
(0.13,335)
400
O�
' O
c 30010
.
S
Area D-Pre-,1-Yr:
(0.25,307)
200 oso
100
80
60
40
.1 .2 .4 .6 .8 1 2 4 6 8 10
Time of concentration (Td, (hours)
(210-VI-TR-55,Second Ed.,June 1986) 4-7
Chapter 4 Graphical Peak Dischage Method Technical Release 55
Urban Hydrology for Small Watersheds
Table 4-2 Adjustment factor(Fp)for pond and swamp • When this method is used to develop estimates of
areas that are spread throughout the peak discharge for both present and developed
watershed
conditions of a watershed,use the same procedure
for estimating T,
Percentage of pond
and swamp areas Fp • TC values with this method may range from 0.1 to
10 hours.
0..................................................... 1.00
0.2..................................................0.97
1.0..................................................0.87 Example 4-1
3.0..................................................0.75
5.0..................................................0.72 Compute the 25-year peak discharge for the 250-acre
watershed described in examples 2-2 and 3-1. Figure 4-
Limitations 2 shows how worksheet 4 is used to compute qp as
345 cfs.
The Graphical method provides a determination of
peak discharge only.If a hydrograph is needed or
watershed subdivision is required,use the Tabular
Hydrograph method(chapter 5). Use TR-20 if the
watershed is very complex or a higher degree of
accuracy is required.
• The watershed must be hydrologically homoge-
neous,that is, describable by one CN.Land use,
soils, and cover are distributed uniformly through-
out the watershed.
• The watershed may have only one main stream or,
if more than one,the branches must have nearly
equal Tc' s.
• The method cannot perform valley or reservoir
routing.
• The Fp factor can be applied only for ponds or
swamps that are not in the TC flow path.
• Accuracy of peak discharge estimated by this
method will be reduced if Ia/P values are used that
are outside the range given in exhibit 4.The limit-
ing Ia/P values are recommended for use.
• This method should be used only if the weighted
CN is greater than 40.
4-2 (210-VI-TR-55,Second Ed.,June 1986)
Chapter 6 Storage Volume for Detention Basins Technical Release 55
Urban Hydrology for Small Watersheds
Input requirements and Estimating VS
procedures
Use worksheet 6a to estimate VS, storage volume
Use figure 6-1 estimate storage volume(VS)required or required,by the following procedure.
peak outflow discharge(qo).The most frequent appli-
cation is to estimate VS,for which the required inputs 1. Determine qo. Many factors may dictate the selec-
are runoff volume (Vr), qo, and peak inflow discharge tion of peak outflow discharge. The most common
(qi). To estimate qo,the required inputs are Vr,VS, is to limit downstream discharges to a desired
and qi. level, such as predevelopment discharge.Another
factor may be that the outflow device has already
been selected.
2. Estimate qi by procedures in chapters 4 or 5. Do
not use peak discharges developed by other proce-
dure. When using the Tabular Hydrograph method
to estimate ql for a subarea, only use peak dis-
charge associated with Tt=0.
Figure 6-1 Approximate detention basin routing for rainfall types I,IA,II,and III
.6
Post-Area D,10-Yr
.5
> j> .4
(D
E E
5 T
0 0
> >
N � ��% Post-Area D,100-Yr
O
.3
O
F%%
.2LL
�
.1
.1 .2 .3 .4 .5 .6 .7 .8
Peak outflow discharge qo
Peak inflow a,
discharge i
6-2 (210-VI-TR-55,Second Ed.,June 1986)
PACIC
CLIENT DRIVEN SOLUTIONS
FIGURES
P.W.GROSSER CONSULTING,INC•P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
631.589.6353 •WWW.PWGROSSER.COM•PWGC.INFO@a PWGROSSER.COM
BOHEMIA • MANHATTAN • SARATOGA SPRINGS • SYRACUSE • SHELTON, CT
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PACIC
CLIENT DRIVEN SOLUTIONS
APPENDIX H
MS4 ACCEPTANCE FORM
P.W.GROSSER CONSULTING,INC•P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
631.589.6353•WWWPWGROSSER.COM•PWGC.INFO@PWGROSSER.COM
BOHEMIA - MANHATTAN SARATOGA SPRINGS SYRACUSE SHELTON, CT
E �o��c Department of
STATE OF f f]P�[}R7lJldll`' Environmental
Conservation
NYS Department of Environmental Conservation
Division of Water
625 Broadway, 4th Floor
Albany, New York 12233-3505
MS4 Stormwater Pollution Prevention Plan (SWPPP) Acceptance
Form
for
Construction Activities Seeking Authorization Under SPDES General Permit
*(NOTE: Attach Completed Form to Notice Of Intent and Submit to Address Above
I. Project Owner/Operator Information
1. Owner/Operator Name: The EIICIaVeS
2. Contact Person:
s. street address: 56655 Route 25
4. City/State/Zip: Southold, NY 11971
II. Project Site Information
5. Project/Site Name: The Enclaves
6. Street Address: 56655 Route 25
7. city/state/zip: Southold, NY 11971
III. Stormwater Pollution Prevention Plan (SWPPP) Review and Acceptance Information
8. SWPPP Reviewed by:
9. Title/Position:
10. Date Final SWPPP Reviewed and Accepted:
IV. Regulated MS4 Information
11. Name of MS4:
12. MS4 SPDES Permit Identification Number: NYR20A
13. Contact Person:
14. Street Address:
15. City/State/Zip:
16. Telephone Number:
Page 1 of 2
MS4 SWPPP Acceptance Form - continued
V. Certification Statement-MS4 Official (principal executive officer or ranking elected official) or
Duly Authorized Representative
hereby certify that the final Stormwater Pollution Prevention Plan (SWPPP)for the construction project
identified in question 5 has been reviewed and meets the substantive requirements in the SPDES
General Permit For Stormwater Discharges from Municipal Separate Storm Sewer Systems (MS4s).
Note: The MS4, through the acceptance of the SWPPP, assumes no responsibility for the accuracy and
adequacy of the design included in the SWPPP. In addition, review and acceptance of the SWPPP by
the MS4 does not relieve the owner/operator or their SWPPP preparer of responsibility or liability for
errors or omissions in the plan.
Printed Name:
Title/Position:
Signature:
Date:
VI.Additional Information
(NYS DEC- MS4 SWPPP Acceptance Form -January 2015)
Page 2 of 2
PACIC
CLIENT DRIVEN SOLUTIONS
APPENDIX I
PROPOSED SITE PLANS (CONSTRUCTION DRAWINGS)
P.W.GROSSER CONSULTING,INC•P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
631.589.6353•WWWPWGROSSER.COM•PWGC.INFO@PWGROSSER.COM
BOHEMIA - MANHATTAN SARATOGA SPRINGS SYRACUSE SHELTON, CT
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PACIC
CLIENT DRIVEN SOLUTIONS
APPENDIX j
NYSDEC SPDES GENERAL PERMIT
GP-o-20-001
P.W.GROSSER CONSULTING,INC•P.W.GROSSER CONSULTING ENGINEER&HYDROGEOLOGIST,PC
631.589.6353•WWWPWGROSSER.COM•PWGC.INFO@PWGROSSER.COM
BOHEMIA - MANHATTAN SARATOGA SPRINGS SYRACUSE SHELTON, CT
'N"EW YORK Department of
STATE.OF
OPPOKUNITY Environmental
Conservation
NEW YORK STATE
DEPARTMENT OF ENVIRONMENTAL CONSERVATION
SPDES GENERAL PERMIT
FOR STORMWATER DISCHARGES
From
CONSTRUCTION ACTIVITY
Permit No. GP- 0-20-001
Issued Pursuant to Article 17, Titles 7, 8 and Article 70
of the Environmental Conservation Law
Effective Date: January 29, 2020 Expiration Date: January 28, 2025
John J. Ferguson
Chief Permit Administrator
7"0
uthorized Signature Date
Address: NYS DEC
Division of Environmental Permits
625 Broadway, 4th Floor
Albany, N.Y. 12233-1750
PREFACE
Pursuant to Section 402 of the Clean Water Act ("CWA"), stormwater discharges
from certain construction activities are unlawful unless they are authorized by a National
Pollutant Discharge Elimination System ("NPDES') permit or by a state permit program.
New York administers the approved State Pollutant Discharge Elimination System
(SPDES) program with permits issued in accordance with the New York State
Environmental Conservation Law (ECL) Article 17, Titles 7, 8 and Article 70.
An owner or operator of a construction activity that is eligible for coverage under
this permit must obtain coverage prior to the commencement of construction activity.
Activities that fit the definition of "construction activity', as defined under 40 CFR
122.26(b)(14)(x), (15)(i), and (15)(ii), constitute construction of a point source and
therefore, pursuant to ECL section 17-0505 and 17-0701, the owner or operator must
have coverage under a SPDES permit prior to commencing construction activity. The
owner or operator cannot wait until there is an actual discharge from the construction site
to obtain permit coverage.
*Note: The italicized words/phrases within this permit are defined in Appendix A.
NEW YORK STATE DEPARTMENT OF ENVIRONMENTAL CONSERVATION
SPDES GENERAL PERMIT FOR STORMWATER DISCHARGES FROM
CONSTRUCTION ACTIVITIES
Table of Contents
Part 1. PERMIT COVERAGE AND LIMITATIONS.............................................................1
A. Permit Application .................................................................................................1
B. Effluent Limitations Applicable to Discharges from Construction Activities ...........1
C. Post-construction Stormwater Management Practice Requirements ....................4
D. Maintaining Water Quality.....................................................................................8
E. Eligibility Under This General Permit.....................................................................9
F. Activities Which Are Ineligible for Coverage Under This General Permit ..............9
Part II. PERMIT COVERAGE...........................................................................................12
A. How to Obtain Coverage.....................................................................................12
B. Notice of Intent (NOI) Submittal ..........................................................................13
C. Permit Authorization............................................................................................13
D. General Requirements For Owners or Operators With Permit Coverage ...........15
E. Permit Coverage for Discharges Authorized Under GP-0-15-002.......................17
F. Change of Owner or Operator.............................................................................17
Part III. STORMWATER POLLUTION PREVENTION PLAN (SWPPP)...........................18
A. General SWPPP Requirements ..........................................................................18
B. Required SWPPP Contents ................................................................................20
C. Required SWPPP Components by Project Type.................................................24
Part IV. INSPECTION AND MAINTENANCE REQUIREMENTS.....................................24
A. General Construction Site Inspection and Maintenance Requirements ..............24
B. Contractor Maintenance Inspection Requirements .............................................24
C. Qualified Inspector Inspection Requirements......................................................25
Part V. TERMINATION OF PERMIT COVERAGE...........................................................29
A. Termination of Permit Coverage .........................................................................29
Part VI. REPORTING AND RETENTION RECORDS......................................................31
A. Record Retention ................................................................................................31
B. Addresses...........................................................................................................31
Part VII. STANDARD PERMIT CONDITIONS..................................................................31
A. Duty to Comply....................................................................................................31
B. Continuation of the Expired General Permit........................................................32
C. Enforcement........................................................................................................32
D. Need to Halt or Reduce Activity Not a Defense...................................................32
E. Duty to Mitigate ...................................................................................................33
F. Duty to Provide Information.................................................................................33
G. Other Information ................................................................................................33
H. Signatory Requirements......................................................................................33
I. Property Rights ...................................................................................................35
J. Severability..........................................................................................................35
K. Requirement to Obtain Coverage Under an Alternative Permit...........................35
L. Proper Operation and Maintenance ....................................................................36
M. Inspection and Entry ...........................................................................................36
N. Permit Actions.....................................................................................................37
O. Definitions ...........................................................................................................37
P. Re-Opener Clause ..............................................................................................37
Q. Penalties for Falsification of Forms and Reports.................................................37
R. Other Permits......................................................................................................38
APPENDIX A—Acronyms and Definitions .......................................................................39
Acronyms......................................................................................................................39
Definitions.....................................................................................................................40
APPENDIX B — Required SWPPP Components by Project Type ....................................48
Table1..........................................................................................................................48
Table2..........................................................................................................................50
APPENDIX C —Watersheds Requiring Enhanced Phosphorus Removal........................52
APPENDIX D —Watersheds with Lower Disturbance Threshold .....................................58
APPENDIX E — 303(d) Segments Impaired by Construction Related Pollutant(s) ...........59
APPENDIX F — List of NYS DEC Regional Offices ..........................................................65
(Part I)
Part 1. PERMIT COVERAGE AND LIMITATIONS
A. Permit Application
This permit authorizes stormwater discharges to surface waters of the State from
the following construction activities identified within 40 CFR Parts 122.26(b)(14)(x),
122.26(b)(15)(i) and 122.26(b)(15)(ii), provided all of the eligibility provisions of this
permit are met:
1. Construction activities involving soil disturbances of one (1) or more acres;
including disturbances of less than one acre that are part of a larger common
plan of development or sale that will ultimately disturb one or more acres of
land; excluding routine maintenance activity that is performed to maintain the
original line and grade, hydraulic capacity or original purpose of a facility;
2. Construction activities involving soil disturbances of less than one (1) acre
where the Department has determined that a SPDES permit is required for
stormwater discharges based on the potential for contribution to a violation of a
water quality standard or for significant contribution of pollutants to surface
waters of the State.
3. Construction activities located in the watershed(s) identified in Appendix D that
involve soil disturbances between five thousand (5,000) square feet and one
(1) acre of land.
B. Effluent Limitations Applicable to Discharges from Construction Activities
Discharges authorized by this permit must achieve, at a minimum, the effluent
limitations in Part I.B.1. (a)— (f) of this permit. These limitations represent the degree of
effluent reduction attainable by the application of best practicable technology currently
available.
1. Erosion and Sediment Control Requirements - The owner or operator must
select, design, install, implement and maintain control measures to minimize
the discharge of pollutants and prevent a violation of the water quality
standards. The selection, design, installation, implementation, and
maintenance of these control measures must meet the non-numeric effluent
limitations in Part 1.B.1.(a) — (f) of this permit and be in accordance with the
New York State Standards and Specifications for Erosion and Sediment
Control, dated November 2016, using sound engineering judgment. Where
control measures are not designed in conformance with the design criteria
included in the technical standard, the owner or operator must include in the
Stormwater Pollution Prevention Plan ("SWPPP") the reason(s) for the
1
(Part 1.B.1)
deviation or alternative design and provide information which demonstrates that
the deviation or alternative design is equivalent to the technical standard.
a. Erosion and Sediment Controls. Design, install and maintain effective
erosion and sediment controls to minimize the discharge of pollutants and
prevent a violation of the water quality standards. At a minimum, such
controls must be designed, installed and maintained to:
(i) Minimize soil erosion through application of runoff control and soil
stabilization control measure to minimize pollutant discharges;
(ii) Control stormwater discharges, including both peak flowrates and total
stormwater volume, to minimize channel and streambank erosion and
scour in the immediate vicinity of the discharge points;
(iii) Minimize the amount of soil exposed during construction activity;
(iv) Minimize the disturbance of steep slopes;
(v) Minimize sediment discharges from the site;
(vi) Provide and maintain natural buffers around surface waters, direct
stormwater to vegetated areas and maximize stormwater infiltration to
reduce pollutant discharges, unless infeasible;
(vii) Minimize soil compaction. Minimizing soil compaction is not required
where the intended function of a specific area of the site dictates that it
be compacted;
(viii) Unless infeasible, preserve a sufficient amount of topsoil to complete
soil restoration and establish a uniform, dense vegetative cover; and
(ix) Minimize dust. On areas of exposed soil, minimize dust through the
appropriate application of water or other dust suppression techniques
to control the generation of pollutants that could be discharged from
the site.
b. Soil Stabilization. In areas where soil disturbance activity has temporarily
or permanently ceased, the application of soil stabilization measures must
be initiated by the end of the next business day and completed within
fourteen (14) days from the date the current soil disturbance activity ceased.
For construction sites that directly discharge to one of the 303(d) segments
2
(Part I.BA.b)
listed in Appendix E or is located in one of the watersheds listed in
Appendix C, the application of soil stabilization measures must be initiated
by the end of the next business day and completed within seven (7) days
from the date the current soil disturbance activity ceased. See Appendix A
for definition of Temporarily Ceased.
c. Dewatering. Discharges from dewatering activities, including discharges
from dewatering of trenches and excavations, must be managed by
appropriate control measures.
d. Pollution Prevention Measures. Design, install, implement, and maintain
effective pollution prevention measures to minimize the discharge of
pollutants and prevent a violation of the water quality standards. At a
minimum, such measures must be designed, installed, implemented and
maintained to:
(i) Minimize the discharge of pollutants from equipment and vehicle
washing, wheel wash water, and other wash waters. This applies to
washing operations that use clean water only. Soaps, detergents and
solvents cannot be used;
(ii) Minimize the exposure of building materials, building products,
construction wastes, trash, landscape materials, fertilizers, pesticides,
herbicides, detergents, sanitary waste, hazardous and toxic waste, and
other materials present on the site to precipitation and to stormwater.
Minimization of exposure is not required in cases where the exposure
to precipitation and to stormwater will not result in a discharge of
pollutants, or where exposure of a specific material or product poses
little risk of stormwater contamination (such as final products and
materials intended for outdoor use) ; and
(iii) Prevent the discharge of pollutants from spills and leaks and
implement chemical spill and leak prevention and response
procedures.
e. Prohibited Discharges. The following discharges are prohibited:
(i) Wastewater from washout of concrete;
(ii) Wastewater from washout and cleanout of stucco, paint, form release
oils, curing compounds and other construction materials;
3
(Part 13.1.e.iii)
(iii) Fuels, oils, or other pollutants used in vehicle and equipment operation
and maintenance;
(iv) Soaps or solvents used in vehicle and equipment washing; and
(v) Toxic or hazardous substances from a spill or other release.
f. Surface Outlets. When discharging from basins and impoundments, the
outlets shall be designed, constructed and maintained in such a manner
that sediment does not leave the basin or impoundment and that erosion at
or below the outlet does not occur.
C. Post-construction Stormwater Management Practice Requirements
1. The owner or operator of a construction activity that requires post-construction
stormwater management practices pursuant to Part III.C. of this permit must
select, design, install, and maintain the practices to meet the performance
criteria in the New York State Stormwater Management Design Manual
("Design Manual"), dated January 2015, using sound engineering judgment.
Where post-construction stormwater management practices ("SMPs") are not
designed in conformance with the performance criteria in the Design Manual,
the owner or operator must include in the SWPPP the reason(s) for the
deviation or alternative design and provide information which demonstrates that
the deviation or alternative design is equivalent to the technical standard.
2. The owner or operator of a construction activity that requires post-construction
stormwater management practices pursuant to Part III.C. of this permit must
design the practices to meet the applicable sizing criteria in Part I.C.2.a., b., C.
or d. of this permit.
a. Sizing Criteria for New Development
(i) Runoff Reduction Volume ("RRv"): Reduce the total Water Quality
Volume ("WQv") by application of RR techniques and standard SMPs
with RRv capacity. The total WQv shall be calculated in accordance
with the criteria in Section 4.2 of the Design Manual.
(ii) Minimum RRv and Treatment of Remaining Total WQv: Construction
activities that cannot meet the criteria in Part I.C.2.a.(i) of this permit
due to site limitations shall direct runoff from all newly constructed
impervious areas to a RR technique or standard SMP with RRv
capacity unless infeasible. The specific site limitations that prevent the
reduction of 100% of the WQv shall be documented in the SWPPP.
4
(Part I.C.2.a.ii)
For each impervious area that is not directed to a RR technique or
standard SMP with RRv capacity, the SWPPP must include
documentation which demonstrates that all options were considered
and for each option explains why it is considered infeasible.
In no case shall the runoff reduction achieved from the newly
constructed impervious areas be less than the Minimum RRv as
calculated using the criteria in Section 4.3 of the Design Manual.
The remaining portion of the total WQv that cannot be reduced shall be
treated by application of standard SMPs.
(iii) Channel Protection Volume ("Cpv"): Provide 24 hour extended
detention of the post-developed 1-year, 24-hour storm event;
remaining after runoff reduction. The Cpv requirement does not apply
when:
(1) Reduction of the entire Cpv is achieved by application of runoff
reduction techniques or infiltration systems, or
(2) The site discharges directly to tidal waters, or fifth order or larger
streams.
(iv) Overbank Flood Control Criteria ("Qp"): Requires storage to attenuate
the post-development 10-year, 24-hour peak discharge rate (Qp) to
predevelopment rates. The Qp requirement does not apply when:
(1) the site discharges directly to tidal waters or fifth order or larger
streams, or
(2) A downstream analysis reveals that overbank control is not
required.
(v) Extreme Flood Control Criteria ("Qf'): Requires storage to attenuate
the post-development 100-year, 24-hour peak discharge rate (Qf) to
predevelopment rates. The Qf requirement does not apply when:
(1) the site discharges directly to tidal waters or fifth order or larger
streams, or
(2) A downstream analysis reveals that overbank control is not
required.
b. Sizing Criteria for New Development in Enhanced Phosphorus
Removal Watershed
(i) Runoff Reduction Volume (RRv): Reduce the total Water Quality
Volume (WQv) by application of RR techniques and standard SMPs
with RRv capacity. The total WQv is the runoff volume from the 1-year,
24 hour design storm over the post-developed watershed and shall be
5
(Part I.C.2.b.i)
calculated in accordance with the criteria in Section 10.3 of the Design
Manual.
(ii) Minimum RRv and Treatment of Remaining Total WQv: Construction
activities that cannot meet the criteria in Part I.C.2.b.(i) of this permit
due to site limitations shall direct runoff from all newly constructed
impervious areas to a RR technique or standard SMP with RRv
capacity unless infeasible. The specific site limitations that prevent the
reduction of 100% of the WQv shall be documented in the SWPPP.
For each impervious area that is not directed to a RR technique or
standard SMP with RRv capacity, the SWPPP must include
documentation which demonstrates that all options were considered
and for each option explains why it is considered infeasible.
In no case shall the runoff reduction achieved from the newly
constructed impervious areas be less than the Minimum RRv as
calculated using the criteria in Section 10.3 of the Design Manual.
The remaining portion of the total WQv that cannot be reduced shall be
treated by application of standard SMPs.
(iii) Channel Protection Volume (Cpv): Provide 24 hour extended detention
of the post-developed 1-year, 24-hour storm event; remaining after
runoff reduction. The Cpv requirement does not apply when:
(1) Reduction of the entire Cpv is achieved by application of runoff
reduction techniques or infiltration systems, or
(2) The site discharges directly to tidal waters, or fifth order or larger
streams.
(iv) Overbank Flood Control Criteria (Qp): Requires storage to attenuate
the post-development 10-year, 24-hour peak discharge rate (Qp) to
predevelopment rates. The Qp requirement does not apply when:
(1) the site discharges directly to tidal waters or fifth order or larger
streams, or
(2) A downstream analysis reveals that overbank control is not
required.
(v) Extreme Flood Control Criteria (Qf): Requires storage to attenuate the
post-development 100-year, 24-hour peak discharge rate (Qf) to
predevelopment rates. The Qf requirement does not apply when:
(1) the site discharges directly to tidal waters or fifth order or larger
streams, or
(2) A downstream analysis reveals that overbank control is not
required.
6
(Part I.C.2.c)
c. Sizing Criteria for Redevelopment Activity
(i) Water Quality Volume (WQv): The WQv treatment objective for
redevelopment activity shall be addressed by one of the following
options. Redevelopment activities located in an Enhanced Phosphorus
Removal Watershed (see Part 111.B.3. and Appendix C of this permit)
shall calculate the WQv in accordance with Section 10.3 of the Design
Manual. All other redevelopment activities shall calculate the WQv in
accordance with Section 4.2 of the Design Manual.
(1) Reduce the existing impervious cover by a minimum of 25% of the
total disturbed, impervious area. The Soil Restoration criteria in
Section 5.1.6 of the Design Manual must be applied to all newly
created pervious areas, or
(2) Capture and treat a minimum of 25% of the WQv from the disturbed,
impervious area by the application of standard SMPs; or reduce 25%
of the WQv from the disturbed, impervious area by the application of
RR techniques or standard SMPs with RRv capacity., or
(3) Capture and treat a minimum of 75% of the WQv from the disturbed,
impervious area as well as any additional runoff from tributary areas
by application of the alternative practices discussed in Sections 9.3
and 9.4 of the Design Manual., or
(4) Application of a combination of 1, 2 and 3 above that provide a
weighted average of at least two of the above methods. Application
of this method shall be in accordance with the criteria in Section
9.2.1(B) (IV) of the Design Manual.
If there is an existing post-construction stormwater management
practice located on the site that captures and treats runoff from the
impervious area that is being disturbed, the WQv treatment option
selected must, at a minimum, provide treatment equal to the treatment
that was being provided by the existing practice(s) if that treatment is
greater than the treatment required by options 1 —4 above.
(ii) Channel Protection Volume (Cpv): Not required if there are no
changes to hydrology that increase the discharge rate from the project
site.
(iii) Overbank Flood Control Criteria (Qp): Not required if there are no
changes to hydrology that increase the discharge rate from the project
site.
(iv) Extreme Flood Control Criteria (Qf): Not required if there are no
changes to hydrology that increase the discharge rate from the project
site
7
(Part I.C.2.d)
d. Sizing Criteria for Combination of Redevelopment Activity and New
Development
Construction projects that include both New Development and Redevelopment
Activity shall provide post-construction stormwater management controls that
meet the sizing criteria calculated as an aggregate of the Sizing Criteria in Part
I.C.2.a. or b. of this permit for the New Development portion of the project and
Part I.C.2.c of this permit for Redevelopment Activity portion of the project.
D. Maintaining Water Quality
The Department expects that compliance with the conditions of this permit will control
discharges necessary to meet applicable water quality standards. It shall be a violation
of the ECL for any discharge to either cause or contribute to a violation of water quality
standards as contained in Parts 700 through 705 of Title 6 of the Official Compilation of
Codes, Rules and Regulations of the State of New York, such as:
1. There shall be no increase in turbidity that will cause a substantial visible contrast
to natural conditions;
2. There shall be no increase in suspended, colloidal or settleable solids that will
cause deposition or impair the waters for their best usages; and
3. There shall be no residue from oil and floating substances, nor visible oil film, nor
globules of grease.
If there is evidence indicating that the stormwater discharges authorized by this permit
are causing, have the reasonable potential to cause, or are contributing to a violation of
the water quality standards; the owner or operator must take appropriate corrective
action in accordance with Part IV-C.S. of this general permit and document in
accordance with Part IV.C.4. of this general permit. To address the water quality
standard violation the owner or operator may need to provide additional information,
include and implement appropriate controls in the SWPPP to correct the problem, or
obtain an individual SPDES permit.
If there is evidence indicating that despite compliance with the terms and conditions of
this general permit it is demonstrated that the stormwater discharges authorized by this
permit are causing or contributing to a violation of water quality standards, or if the
Department determines that a modification of the permit is necessary to prevent a
violation of water quality standards, the authorized discharges will no longer be eligible
for coverage under this permit. The Department may require the owner or operator to
obtain an individual SPDES permit to continue discharging.
8
(Part I.E)
E. Eligibility Under This General Permit
1. This permit may authorize all discharges of stormwater from construction
activity to surface waters of the State and groundwaters except for ineligible
discharges identified under subparagraph F. of this Part.
2. Except for non-stormwater discharges explicitly listed in the next paragraph,
this permit only authorizes stormwater discharges; including stormwater runoff,
snowmelt runoff, and surface runoff and drainage, from construction activities.
3. Notwithstanding paragraphs E.1 and E.2 above, the following non-stormwater
discharges are authorized by this permit: those listed in 6 NYCRR 750-
1.2(a)(29)(vi), with the following exception: "Discharges from firefighting
activities are authorized only when the firefighting activities are
emergencies/unplanned"; waters to which other components have not been
added that are used to control dust in accordance with the SWPPP; and
uncontaminated discharges from construction site de-watering operations. All
non-stormwater discharges must be identified in the SWPPP. Under all
circumstances, the owner or operator must still comply with water quality
standards in Part I.D of this permit.
4. The owner or operator must maintain permit eligibility to discharge under this
permit. Any discharges that are not compliant with the eligibility conditions of
this permit are not authorized by the permit and the owner or operator must
either apply for a separate permit to cover those ineligible discharges or take
steps necessary to make the discharge eligible for coverage.
F. Activities Which Are Ineligible for Coverage Under This General Permit
All of the following are not authorized by this permit:
1. Discharges after construction activities have been completed and the site has
undergone final stabilization;
2. Discharges that are mixed with sources of non-stormwater other than those
expressly authorized under subsection E.3. of this Part and identified in the
SWPPP required by this permit;
3. Discharges that are required to obtain an individual SPDES permit or another
SPDES general permit pursuant to Part VII.K. of this permit;
4. Construction activities or discharges from construction activities that may
adversely affect an endangered or threatened species unless the owner or
9
(Part I.F.4)
operator has obtained a permit issued pursuant to 6 NYCRR Part 182 for the
project or the Department has issued a letter of non-jurisdiction for the project.
All documentation necessary to demonstrate eligibility shall be maintained on
site in accordance with Part II.D.2 of this permit;
5. Discharges which either cause or contribute to a violation of water quality
standards adopted pursuant to the ECL and its accompanying regulations;
6. Construction activities for residential, commercial and institutional projects:
a. Where the discharges from the construction activities are tributary to waters
of the state classified as AA or AA-s; and
b. Which are undertaken on land with no existing impervious cover; and
c. Which disturb one (1) or more acres of land designated on the current
United States Department of Agriculture ("USDA") Soil Survey as Soil
Slope Phase "D", (provided the map unit name is inclusive of slopes greater
than 25%), or Soil Slope Phase "E" or T" (regardless of the map unit
name), or a combination of the three designations.
7. Construction activities for linear transportation projects and linear utility
projects:
a. Where the discharges from the construction activities are tributary to waters
of the state classified as AA or AA-s; and
b. Which are undertaken on land with no existing impervious cover; and
c. Which disturb two (2) or more acres of land designated on the current USDA
Soil Survey as Soil Slope Phase T" (provided the map unit name is inclusive of
slopes greater than 25%), or Soil Slope Phase "E" or T" (regardless of the map
unit name), or a combination of the three designations.
10
(Part I.F.8)
8. Construction activities that have the potential to affect an historic property,
unless there is documentation that such impacts have been resolved. The
following documentation necessary to demonstrate eligibility with this
requirement shall be maintained on site in accordance with Part I I.D.2 of this
permit and made available to the Department in accordance with Part VII.F of
this permit:
a. Documentation that the construction activity is not within an archeologically
sensitive area indicated on the sensitivity map, and that the construction
activity is not located on or immediately adjacent to a property listed or
determined to be eligible for listing on the National or State Registers of
Historic Places, and that there is no new permanent building on the
construction site within the following distances from a building, structure, or
object that is more than 50 years old, or if there is such a new permanent
building on the construction site within those parameters that NYS Office of
Parks, Recreation and Historic Preservation (OPRHP), a Historic
Preservation Commission of a Certified Local Government, or a qualified
preservation professional has determined that the building, structure, or
object more than 50 years old is not historically/archeologically significant.
■ 1-5 acres of disturbance - 20 feet
■ 5-20 acres of disturbance - 50 feet
■ 20+ acres of disturbance - 100 feet, or
b. DEC consultation form sent to OPRHP, and copied to the NYS DEC Agency
Historic Preservation Officer (APO), and
(i) the State Environmental Quality Review (SEQR) Environmental
Assessment Form (EAF) with a negative declaration or the Findings
Statement, with documentation of OPRHP's agreement with the
resolution; or
(ii) documentation from OPRHP that the construction activity will result in
No Impact; or
(iii) documentation from OPRHP providing a determination of No Adverse
Impact; or
(iv) a Letter of Resolution signed by the owner/operator, OPRHP and the
DEC APO which allows for this construction activity to be eligible for
coverage under the general permit in terms of the State Historic
Preservation Act (SHPA); or
c. Documentation of satisfactory compliance with Section 106 of the National
Historic Preservation Act for a coterminous project area:
11
(Part I.F.8.c)
(i) No Affect
(ii) No Adverse Affect
(iii) Executed Memorandum of Agreement, or
d. Documentation that:
(i) SHPA Section 14.09 has been completed by NYS DEC or another state
agency.
9. Discharges from construction activities that are subject to an existing SPDES
individual or general permit where a SPDES permit for construction activity has
been terminated or denied; or where the owner or operator has failed to renew
an expired individual permit.
Part II. PERMIT COVERAGE
A. How to Obtain Coverage
1. An owner or operator of a construction activity that is not subject to the
requirements of a regulated, traditional land use control MS4 must first prepare
a SWPPP in accordance with all applicable requirements of this permit and
then submit a completed Notice of Intent (NOI) to the Department to be
authorized to discharge under this permit.
2. An owner or operator of a construction activity that is subject to the
requirements of a regulated, traditional land use control MS4 must first prepare
a SWPPP in accordance with all applicable requirements of this permit and
then have the SWPPP reviewed and accepted by the regulated, traditional land
use control MS4 prior to submitting the NOI to the Department. The owner or
operator shall have the "MS4 SWPPP Acceptance" form signed in accordance
with Part VII.H., and then submit that form along with a completed NOI to the
Department.
3. The requirement for an owner or operator to have its SWPPP reviewed and
accepted by the regulated, traditional land use control MS4 prior to submitting
the NOI to the Department does not apply to an owner or operator that is
obtaining permit coverage in accordance with the requirements in Part I I.F.
(Change of Owner or Operator) or where the owner or operator of the
construction activity is the regulated, traditional land use control MS4 . This
exemption does not apply to construction activities subject to the New York City
Administrative Code.
12
(Part ILB)
B. Notice of Intent (NOI) Submittal
1. Prior to December 21, 2020, an owner or operator shall use either the
electronic (eN01) or paper version of the NOI that the Department prepared.
Both versions of the NOI are located on the Department's website
(http://www.dec.ny.gov/ ). The paper version of the NOI shall be signed in
accordance with Part VII.H. of this permit and submitted to the following
address:
NOTICE OF INTENT
NYS DEC, Bureau of Water Permits
625 Broadway, 4t" Floor
Albany, New York 12233-3505
2. Beginning December 21, 2020 and in accordance with EPA's 2015 NPDES
Electronic Reporting Rule (40 CFR Part 127), the owner or operator must submit
the NOI electronically using the Department's online NO1.
3. The owner or operator shall have the SWPPP preparer sign the "SWPPP
Preparer Certification" statement on the NOI prior to submitting the form to the
Department.
4. As of the date the NOI is submitted to the Department, the owner or operator
shall make the NOI and SWPPP available for review and copying in accordance
with the requirements in Part VII.F. of this permit.
C. Permit Authorization
1. An owner or operator shall not commence construction activity until their
authorization to discharge under this permit goes into effect.
2. Authorization to discharge under this permit will be effective when the owner or
operator has satisfied all of the following criteria:
a. project review pursuant to the State Environmental Quality Review Act
("SEQRA") have been satisfied, when SEQRA is applicable. See the
Department's website (http://www.dec.ny.gov/,) for more information,
b. where required, all necessary Department permits subject to the Uniform
Procedures Act ("UPA') (see 6 NYCRR Part 621), or the equivalent from
another New York State agency, have been obtained, unless otherwise
notified by the Department pursuant to 6 NYCRR 621.3(a)(4). Owners or
operators of construction activities that are required to obtain UPA permits
13
(Part II.C.2.b)
must submit a preliminary SWPPP to the appropriate DEC Permit
Administrator at the Regional Office listed in Appendix F at the time all other
necessary UPA permit applications are submitted. The preliminary SWPPP
must include sufficient information to demonstrate that the construction
activity qualifies for authorization under this permit,
c. the final SWPPP has been prepared, and
d. a complete NOI has been submitted to the Department in accordance with
the requirements of this permit.
3. An owner or operator that has satisfied the requirements of Part II.C.2 above
will be authorized to discharge stormwater from their construction activity in
accordance with the following schedule:
a. For construction activities that are not subject to the requirements of a
regulated, traditional land use control MS4:
(i) Five (5) business days from the date the Department receives a
complete electronic version of the NOI (eNOl) for construction activities
with a SWPPP that has been prepared in conformance with the design
criteria in the technical standard referenced in Part III.B.1 and the
performance criteria in the technical standard referenced in Parts III.B.,
2 or 3, for construction activities that require post-construction
stormwater management practices pursuant to Part III.C.; or
(ii) Sixty (60) business days from the date the Department receives a
complete NOI (electronic or paper version) for construction activities
with a SWPPP that has not been prepared in conformance with the
design criteria in technical standard referenced in Part III.B.1. or, for
construction activities that require post-construction stormwater
management practices pursuant to Part III.C., the performance criteria
in the technical standard referenced in Parts III.B., 2 or 3, or;
(iii) Ten (10) business days from the date the Department receives a
complete paper version of the NOI for construction activities with a
SWPPP that has been prepared in conformance with the design
criteria in the technical standard referenced in Part III.B.1 and the
performance criteria in the technical standard referenced in Parts III.B.,
2 or 3, for construction activities that require post-construction
stormwater management practices pursuant to Part III.C.
14
(Part H.C.1b)
b. For construction activities that are subject to the requirements of a
regulated, traditional land use control MS4:
(i) Five (5) business days from the date the Department receives both a
complete electronic version of the NOI (eNO1) and signed "MS4
SWPPP Acceptance" form, or
(ii) Ten (10) business days from the date the Department receives both a
complete paper version of the NOI and signed "MS4 SWPPP
Acceptance" form.
4. Coverage under this permit authorizes stormwater discharges from only those
areas of disturbance that are identified in the NOI. If an owner or operator
wishes to have stormwater discharges from future or additional areas of
disturbance authorized, they must submit a new NOI that addresses that phase
of the development, unless otherwise notified by the Department. The owner or
operator shall not commence construction activity on the future or additional
areas until their authorization to discharge under this permit goes into effect in
accordance with Part II.C. of this permit.
D. General Requirements For Owners or Operators With Permit Coverage
1. The owner or operator shall ensure that the provisions of the SWPPP are
implemented from the commencement of construction activity until all areas of
disturbance have achieved final stabilization and the Notice of Termination
("NOT") has been submitted to the Department in accordance with Part V. of
this permit. This includes any changes made to the SWPPP pursuant to Part
III.A.4. of this permit.
2. The owner or operator shall maintain a copy of the General Permit (GP-0-20-
001), NOI, NOI Acknowledgment Letter, SWPPP, MS4 SWPPP Acceptance
form, inspection reports, responsible contractor's or subcontractor's certification
statement (see Part III.A.6.), and all documentation necessary to demonstrate
eligibility with this permit at the construction site until all disturbed areas have
achieved final stabilization and the NOT has been submitted to the Department.
The documents must be maintained in a secure location, such as a job trailer,
on-site construction office, or mailbox with lock. The secure location must be
accessible during normal business hours to an individual performing a
compliance inspection.
3. The owner or operator of a construction activity shall not disturb greater than
five (5) acres of soil at any one time without prior written authorization from the
Department or, in areas under the jurisdiction of a regulated, traditional land
15
(Part I I.D.3)
use control MS4, the regulated, traditional land use control MS4 (provided the
regulated, traditional land use control MS4 is not the owner or operator of the
construction activity). At a minimum, the owner or operator must comply with
the following requirements in order to be authorized to disturb greater than five
(5) acres of soil at any one time:
a. The owner or operator shall have a qualified inspector conduct at least two
(2) site inspections in accordance with Part IV.C. of this permit every seven
(7) calendar days, for as long as greater than five (5) acres of soil remain
disturbed. The two (2) inspections shall be separated by a minimum of two
(2) full calendar days.
b. In areas where soil disturbance activity has temporarily or permanently
ceased, the application of soil stabilization measures must be initiated by
the end of the next business day and completed within seven (7) days from
the date the current soil disturbance activity ceased. The soil stabilization
measures selected shall be in conformance with the technical standard,
New York State Standards and Specifications for Erosion and Sediment
Control, dated November 2016.
c. The owner or operator shall prepare a phasing plan that defines maximum
disturbed area per phase and shows required cuts and fills.
d. The owner or operator shall install any additional site-specific practices
needed to protect water quality.
e. The owner or operator shall include the requirements above in their
SWPPP.
4. In accordance with statute, regulations, and the terms and conditions of this
permit, the Department may suspend or revoke an owner's or operator's
coverage under this permit at any time if the Department determines that the
SWPPP does not meet the permit requirements or consistent with Part VII.K..
5. Upon a finding of significant non-compliance with the practices described in the
SWPPP or violation of this permit, the Department may order an immediate
stop to all activity at the site until the non-compliance is remedied. The stop
work order shall be in writing, describe the non-compliance in detail, and be
sent to the owner or operator.
6. For construction activities that are subject to the requirements of a regulated,
traditional land use control MS4, the owner or operator shall notify the
16
(Part 11.D.6)
regulated, traditional land use control MS4 in writing of any planned
amendments or modifications to the post-construction stormwater management
practice component of the SWPPP required by Part III.A. 4. and 5. of this
permit. Unless otherwise notified by the regulated, traditional land use control
MS4, the owner or operator shall have the SWPPP amendments or
modifications reviewed and accepted by the regulated, traditional land use
control MS4 prior to commencing construction of the post-construction
stormwater management practice.
E. Permit Coverage for Discharges Authorized Under GP-0-15-002
1. Upon renewal of SPDES General Permit for Stormwater Discharges from
Construction Activity (Permit No. GP-0-15-002), an owner or operator of a
construction activity with coverage under GP-0-15-002, as of the effective date
of GP- 0-20-001, shall be authorized to discharge in accordance with GP- 0-20-
001, unless otherwise notified by the Department.
An owner or operator may continue to implement the technical/design
components of the post-construction stormwater management controls
provided that such design was done in conformance with the technical
standards in place at the time of initial project authorization. However, they
must comply with the other, non-design provisions of GP-0-20-001.
F. Change of Owner or Operator
1. When property ownership changes or when there is a change in operational
control over the construction plans and specifications, the original owner or
operator must notify the new owner or operator, in writing, of the requirement to
obtain permit coverage by submitting a NOI with the Department. For
construction activities subject to the requirements of a regulated, traditional
land use control MS4, the original owner or operator must also notify the MS4,
in writing, of the change in ownership at least 30 calendar days prior to the
change in ownership.
2. Once the new owner or operator obtains permit coverage, the original owner or
operator shall then submit a completed NOT with the name and permit
identification number of the new owner or operator to the Department at the
address in Part II.B.1. of this permit. If the original owner or operator maintains
ownership of a portion of the construction activity and will disturb soil, they must
maintain their coverage under the permit.
3. Permit coverage for the new owner or operator will be effective as of the date
the Department receives a complete NOI, provided the original owner or
17
(Part II.F.3)
operator was not subject to a sixty (60) business day authorization period that
has not expired as of the date the Department receives the NOI from the new
owner or operator.
Part III. STORMWATER POLLUTION PREVENTION PLAN (SWPPP)
A. General SWPPP Requirements
1. A SWPPP shall be prepared and implemented by the owner or operator of
each construction activity covered by this permit. The SWPPP must document
the selection, design, installation, implementation and maintenance of the
control measures and practices that will be used to meet the effluent limitations
in Part I.B. of this permit and where applicable, the post-construction
stormwater management practice requirements in Part I.C. of this permit. The
SWPPP shall be prepared prior to the submittal of the NOI. The NOI shall be
submitted to the Department prior to the commencement of construction
activity. A copy of the completed, final NOI shall be included in the SWPPP.
2. The SWPPP shall describe the erosion and sediment control practices and
where required, post-construction stormwater management practices that will
be used and/or constructed to reduce the pollutants in stormwater discharges
and to assure compliance with the terms and conditions of this permit. In
addition, the SWPPP shall identify potential sources of pollution which may
reasonably be expected to affect the quality of stormwater discharges.
3. All SWPPPs that require the post-construction stormwater management
practice component shall be prepared by a qualified professional that is
knowledgeable in the principles and practices of stormwater management and
treatment.
4. The owner or operator must keep the SWPPP current so that it at all times
accurately documents the erosion and sediment controls practices that are
being used or will be used during construction, and all post-construction
stormwater management practices that will be constructed on the site. At a
minimum, the owner or operator shall amend the SWPPP, including
construction drawings:
a. whenever the current provisions prove to be ineffective in minimizing
pollutants in stormwater discharges from the site;
18
(Part I I I.A.4.b)
b. whenever there is a change in design, construction, or operation at the
construction site that has or could have an effect on the discharge of
pollutants;
c. to address issues or deficiencies identified during an inspection by the
qualified inspector, the Department or other regulatory authority; and
d. to document the final construction conditions.
5. The Department may notify the owner or operator at any time that the SWPPP
does not meet one or more of the minimum requirements of this permit. The
notification shall be in writing and identify the provisions of the SWPPP that
require modification. Within fourteen (14) calendar days of such notification, or
as otherwise indicated by the Department, the owner or operator shall make
the required changes to the SWPPP and submit written notification to the
Department that the changes have been made. If the owner or operator does
not respond to the Department's comments in the specified time frame, the
Department may suspend the owner's or operator's coverage under this permit
or require the owner or operator to obtain coverage under an individual SPDES
permit in accordance with Part I I.D.4. of this permit.
6. Prior to the commencement of construction activity, the owner or operator must
identify the contractor(s) and subcontractor(s) that will be responsible for
installing, constructing, repairing, replacing, inspecting and maintaining the
erosion and sediment control practices included in the SWPPP; and the
contractor(s) and subcontractor(s) that will be responsible for constructing the
post-construction stormwater management practices included in the SWPPP.
The owner or operator shall have each of the contractors and subcontractors
identify at least one person from their company that will be responsible for
implementation of the SWPPP. This person shall be known as the trained
contractor. The owner or operator shall ensure that at least one trained
contractor is on site on a daily basis when soil disturbance activities are being
performed.
The owner or operator shall have each of the contractors and subcontractors
identified above sign a copy of the following certification statement below
before they commence any construction activity:
"I hereby certify under penalty of law that I understand and agree to comply
with the terms and conditions of the SWPPP and agree to implement any
corrective actions identified by the qualified inspector during a site
inspection. I also understand that the owner or operator must comply with
19
(Part III.A.6)
the terms and conditions of the most current version of the New York State
Pollutant Discharge Elimination System ("SPDES") general permit for
stormwater discharges from construction activities and that it is unlawful for
any person to cause or contribute to a violation of water quality standards.
Furthermore, I am aware that there are significant penalties for submitting
false information, that I do not believe to be true, including the possibility of
fine and imprisonment for knowing violations"
In addition to providing the certification statement above, the certification page
must also identify the specific elements of the SWPPP that each contractor and
subcontractor will be responsible for and include the name and title of the
person providing the signature; the name and title of the trained contractor
responsible for SWPPP implementation; the name, address and telephone
number of the contracting firm; the address (or other identifying description) of
the site; and the date the certification statement is signed. The owner or
operator shall attach the certification statement(s) to the copy of the SWPPP
that is maintained at the construction site. If new or additional contractors are
hired to implement measures identified in the SWPPP after construction has
commenced, they must also sign the certification statement and provide the
information listed above.
7. For projects where the Department requests a copy of the SWPPP or
inspection reports, the owner or operator shall submit the documents in both
electronic (PDF only) and paper format within five (5) business days, unless
otherwise notified by the Department.
B. Required SWPPP Contents
1. Erosion and sediment control component -All SWPPPs prepared pursuant to
this permit shall include erosion and sediment control practices designed in
conformance with the technical standard, New York State Standards and
Specifications for Erosion and Sediment Control, dated November 2016. Where
erosion and sediment control practices are not designed in conformance with
the design criteria included in the technical standard, the owner or operator
must demonstrate equivalence to the technical standard. At a minimum, the
erosion and sediment control component of the SWPPP shall include the
following:
a. Background information about the scope of the project, including the
location, type and size of project
20
(Part I1 I.B.1.b)
b. A site map/construction drawing(s) for the project, including a general
location map. At a minimum, the site map shall show the total site area; all
improvements; areas of disturbance; areas that will not be disturbed;
existing vegetation; on-site and adjacent off-site surface water(s);
floodplain/floodway boundaries; wetlands and drainage patterns that could
be affected by the construction activity; existing and final contours ;
locations of different soil types with boundaries; material, waste, borrow or
equipment storage areas located on adjacent properties; and location(s) of
the stormwater discharge(s);
c. A description of the soil(s) present at the site, including an identification of
the Hydrologic Soil Group (HSG);
d. A construction phasing plan and sequence of operations describing the
intended order of construction activities, including clearing and grubbing,
excavation and grading, utility and infrastructure installation and any other
activity at the site that results in soil disturbance;
e. A description of the minimum erosion and sediment control practices to be
installed or implemented for each construction activity that will result in soil
disturbance. Include a schedule that identifies the timing of initial placement
or implementation of each erosion and sediment control practice and the
minimum time frames that each practice should remain in place or be
implemented;
f. A temporary and permanent soil stabilization plan that meets the
requirements of this general permit and the technical standard, New York
State Standards and Specifications for Erosion and Sediment Control, dated
November 2016, for each stage of the project, including initial land clearing
and grubbing to project completion and achievement of final stabilization;
g. A site map/construction drawing(s) showing the specific location(s), size(s),
and length(s) of each erosion and sediment control practice;
h. The dimensions, material specifications, installation details, and operation
and maintenance requirements for all erosion and sediment control
practices. Include the location and sizing of any temporary sediment basins
and structural practices that will be used to divert flows from exposed soils;
i. A maintenance inspection schedule for the contractor(s) identified in Part
III.A.6. of this permit, to ensure continuous and effective operation of the
erosion and sediment control practices. The maintenance inspection
21
(Part 111.B.1 J)
schedule shall be in accordance with the requirements in the technical
standard, New York State Standards and Specifications for Erosion and
Sediment Control, dated November 2016;
j. A description of the pollution prevention measures that will be used to
control litter, construction chemicals and construction debris from becoming
a pollutant source in the stormwater discharges;
k. A description and location of any stormwater discharges associated with
industrial activity other than construction at the site, including, but not limited
to, stormwater discharges from asphalt plants and concrete plants located
on the construction site; a n d
I. Identification of any elements of the design that are not in conformance with
the design criteria in the technical standard, New York State Standards and
Specifications for Erosion and Sediment Control, dated November 2016.
Include the reason for the deviation or alternative design and provide
information which demonstrates that the deviation or alternative design is
equivalent to the technical standard.
2. Post-construction stormwater management practice component — The owner or
operator of any construction project identified in Table 2 of Appendix B as
needing post-construction stormwater management practices shall prepare a
SWPPP that includes practices designed in conformance with the applicable
sizing criteria in Part I.C.2.a., c. or d. of this permit and the performance criteria
in the technical standard, New York State Stormwater Management Design
Manual dated January 2015
Where post-construction stormwater management practices are not designed
in conformance with the performance criteria in the technical standard, the
owner or operator must include in the SWPPP the reason(s) for the deviation or
alternative design and provide information which demonstrates that the
deviation or alternative design is equivalent to the technical standard.
The post-construction stormwater management practice component of the
SWPPP shall include the following:
a. Identification of all post-construction stormwater management practices to
be constructed as part of the project. Include the dimensions, material
specifications and installation details for each post-construction stormwater
management practice;
22
(Part 111.6.2.b)
b. A site map/construction drawing(s) showing the specific location and size of
each post-construction stormwater management practice;
c. A Stormwater Modeling and Analysis Report that includes:
(i) Map(s) showing pre-development conditions, including
watershed/subcatchments boundaries, flow paths/routing, and design
points;
(ii) Map(s) showing post-development conditions, including
watershed/subcatchments boundaries, flow paths/routing, design
points and post-construction stormwater management practices;
(iii) Results of stormwater modeling (i.e. hydrology and hydraulic analysis)
for the required storm events. Include supporting calculations (model
runs), methodology, and a summary table that compares pre and post-
development runoff rates and volumes for the different storm events;
(iv) Summary table, with supporting calculations, which demonstrates that
each post-construction stormwater management practice has been
designed in conformance with the sizing criteria included in the Design
Manual;
(v) Identification of any sizing criteria that is not required based on the
requirements included in Part I.C. of this permit; and
(vi) Identification of any elements of the design that are not in conformance
with the performance criteria in the Design Manual. Include the
reason(s) for the deviation or alternative design and provide
information which demonstrates that the deviation or alternative design
is equivalent to the Design Manual;
d. Soil testing results and locations (test pits, borings);
e. Infiltration test results, when required; and
f. An operations and maintenance plan that includes inspection and
maintenance schedules and actions to ensure continuous and effective
operation of each post-construction stormwater management practice. The
plan shall identify the entity that will be responsible for the long term
operation and maintenance of each practice.
23
(Part 11 I.B.3)
3. Enhanced Phosphorus Removal Standards -All construction projects identified
in Table 2 of Appendix B that are located in the watersheds identified in
Appendix C shall prepare a SWPPP that includes post-construction stormwater
management practices designed in conformance with the applicable sizing
criteria in Part I.C.2. b., c. or d. of this permit and the performance criteria,
Enhanced Phosphorus Removal Standards included in the Design Manual. At a
minimum, the post-construction stormwater management practice component
of the SWPPP shall include items 2.a - 2.f. above.
C. Required SWPPP Components by Project Type
Unless otherwise notified by the Department, owners or operators of construction
activities identified in Table 1 of Appendix B are required to prepare a SWPPP that only
includes erosion and sediment control practices designed in conformance with Part
11.B.1 of this permit. Owners or operators of the construction activities identified in Table
2 of Appendix B shall prepare a SWPPP that also includes post-construction stormwater
management practices designed in conformance with Part 111.B.2 or 3 of this permit.
Part IV. INSPECTION AND MAINTENANCE REQUIREMENTS
A. General Construction Site Inspection and Maintenance Requirements
1. The owner or operator must ensure that all erosion and sediment control
practices (including pollution prevention measures) and all post-construction
stormwater management practices identified in the SWPPP are inspected and
maintained in accordance with Part IV.B. and C. of this permit.
2. The terms of this permit shall not be construed to prohibit the State of New
York from exercising any authority pursuant to the ECL, common law or federal
law, or prohibit New York State from taking any measures, whether civil or
criminal, to prevent violations of the laws of the State of New York or protect
the public health and safety and/or the environment.
B. Contractor Maintenance Inspection Requirements
1. The owner or operator of each construction activity identified in Tables 1 and 2
of Appendix B shall have a trained contractor inspect the erosion and sediment
control practices and pollution prevention measures being implemented within
the active work area daily to ensure that they are being maintained in effective
operating condition at all times. If deficiencies are identified, the contractor shall
24
(Part IV.B.1)
begin implementing corrective actions within one business day and shall
complete the corrective actions in a reasonable time frame.
2. For construction sites where soil disturbance activities have been temporarily
suspended (e.g. winter shutdown) and temporary stabilization measures have
been applied to all disturbed areas, the trained contractor can stop conducting
the maintenance inspections. The trained contractor shall begin conducting the
maintenance inspections in accordance with Part IV.13.1. of this permit as soon
as soil disturbance activities resume.
3. For construction sites where soil disturbance activities have been shut down
with partial project completion, the trained contractor can stop conducting the
maintenance inspections if all areas disturbed as of the project shutdown date
have achieved final stabilization and all post-construction stormwater
management practices required for the completed portion of the project have
been constructed in conformance with the SWPPP and are operational.
C. Qualified Inspector Inspection Requirements
The owner or operator shall have a qualified inspector conduct site inspections in
conformance with the following requirements:
[Note: The trained contractor identified in Part III.A.6. and IV.B. of this permit cannot
conduct the qualified inspector site inspections unless they meet the qualified inspector
qualifications included in Appendix A. In order to perform these inspections, the trained
contractor would have to be a:
■ licensed Professional Engineer,
■ Certified Professional in Erosion and Sediment Control (CPESC),
■ New York State Erosion and Sediment Control Certificate Program holder
■ Registered Landscape Architect, or
■ someone working under the direct supervision of, and at the same company as,
the licensed Professional Engineer or Registered Landscape Architect, provided
they have received four (4) hours of Department endorsed training in proper
erosion and sediment control principles from a Soil and Water Conservation
District, or other Department endorsed entity].
1. A qualified inspector shall conduct site inspections for all construction activities
identified in Tables 1 and 2 of Appendix B, with the exception of:
a. the construction of a single family residential subdivision with 25% or less
impervious cover at total site build-out that involves a soil disturbance of
one (1) or more acres of land but less than five (5) acres and is not located
25
(Part IV.C.1.a)
in one of the watersheds listed in Appendix C and not directly discharging to
one of the 303(d) segments listed in Appendix E;
b. the construction of a single family home that involves a soil disturbance of
one (1) or more acres of land but less than five (5) acres and is not located
in one of the watersheds listed in Appendix C and not directly discharging to
one of the 303(d) segments listed in Appendix E;
c. construction on agricultural property that involves a soil disturbance of one
(1) or more acres of land but less than five (5) acres; and
d. construction activities located in the watersheds identified in Appendix D
that involve soil disturbances between five thousand (5,000) square feet
and one (1) acre of land.
2. Unless otherwise notified by the Department, the qualified inspector shall
conduct site inspections in accordance with the following timetable:
a. For construction sites where soil disturbance activities are on-going, the
qualified inspector shall conduct a site inspection at least once every seven
(7) calendar days.
b. For construction sites where soil disturbance activities are on-going and the
owner or operator has received authorization in accordance with Part II.D.3
to disturb greater than five (5) acres of soil at any one time, the qualified
inspector shall conduct at least two (2) site inspections every seven (7)
calendar days. The two (2) inspections shall be separated by a minimum of
two (2) full calendar days.
c. For construction sites where soil disturbance activities have been
temporarily suspended (e.g. winter shutdown) and temporary stabilization
measures have been applied to all disturbed areas, the qualified inspector
shall conduct a site inspection at least once every thirty (30) calendar days.
The owner or operator shall notify the DOW Water (SPDES) Program
contact at the Regional Office (see contact information in Appendix F) or, in
areas under the jurisdiction of a regulated, traditional land use control MS4,
the regulated, traditional land use control MS4 (provided the regulated,
traditional land use control MS4 is not the owner or operator of the
construction activity) in writing prior to reducing the frequency of
inspections.
26
(Part IV.C.2.d)
d. For construction sites where soil disturbance activities have been shut down
with partial project completion, the qualified inspector can stop conducting
inspections if all areas disturbed as of the project shutdown date have
achieved final stabilization and all post-construction stormwater
management practices required for the completed portion of the project
have been constructed in conformance with the SWPPP and are
operational. The owner or operator shall notify the DOW Water (SPDES)
Program contact at the Regional Office (see contact information in Appendix
F) or, in areas under the jurisdiction of a regulated, traditional land use
control MS4, the regulated, traditional land use control MS4 (provided the
regulated, traditional land use control MS4 is not the owner or operator of
the construction activity) in writing prior to the shutdown. If soil disturbance
activities are not resumed within 2 years from the date of shutdown, the
owner or operator shall have the qualified inspector perform a final
inspection and certify that all disturbed areas have achieved final
stabilization, and all temporary, structural erosion and sediment control
measures have been removed; and that all post-construction stormwater
management practices have been constructed in conformance with the
SWPPP by signing the "Final Stabilization" and "Post-Construction
Stormwater Management Practice" certification statements on the NOT. The
owner or operator shall then submit the completed NOT form to the address
in Part II.B.1 of this permit.
e. For construction sites that directly discharge to one of the 303(d) segments
listed in Appendix E or is located in one of the watersheds listed in
Appendix C, the qualified inspector shall conduct at least two (2) site
inspections every seven (7) calendar days. The two (2) inspections shall be
separated by a minimum of two (2) full calendar days.
3. At a minimum, the qualified inspector shall inspect all erosion and sediment
control practices and pollution prevention measures to ensure integrity and
effectiveness, all post-construction stormwater management practices under
construction to ensure that they are constructed in conformance with the
SWPPP, all areas of disturbance that have not achieved final stabilization, all
points of discharge to natural surface waterbod ies located within, or
immediately adjacent to, the property boundaries of the construction site, and
all points of discharge from the construction site.
4. The qualified inspector shall prepare an inspection report subsequent to each
and every inspection. At a minimum, the inspection report shall include and/or
address the following:
27
(Part IV.C.4.a)
a. Date and time of inspection;
b. Name and title of person(s) performing inspection;
c. A description of the weather and soil conditions (e.g. dry, wet, saturated) at
the time of the inspection;
d. A description of the condition of the runoff at all points of discharge from the
construction site. This shall include identification of any discharges of
sediment from the construction site. Include discharges from conveyance
systems (i.e. pipes, culverts, ditches, etc.) and overland flow;
e. A description of the condition of all natural surface waterbodies located
within, or immediately adjacent to, the property boundaries of the
construction site which receive runoff from disturbed areas. This shall
include identification of any discharges of sediment to the surface
waterbody;
f. Identification of all erosion and sediment control practices and pollution
prevention measures that need repair or maintenance;
g. Identification of all erosion and sediment control practices and pollution
prevention measures that were not installed properly or are not functioning
as designed and need to be reinstalled or replaced-
h. Description and sketch of areas with active soil disturbance activity, areas
that have been disturbed but are inactive at the time of the inspection, and
areas that have been stabilized (temporary and/or final) since the last
inspection;
i. Current phase of construction of all post-construction stormwater
management practices and identification of all construction that is not in
conformance with the SWPPP and technical standards;
j. Corrective action(s) that must be taken to install, repair, replace or maintain
erosion and sediment control practices and pollution prevention measures;
and to correct deficiencies identified with the construction of the post-
construction stormwater management practice(s);
k. Identification and status of all corrective actions that were required by
previous inspection; and
28
(Part N.C.4.1)
I. Digital photographs, with date stamp, that clearly show the condition of all
practices that have been identified as needing corrective actions. The
qualified inspector shall attach paper color copies of the digital photographs
to the inspection report being maintained onsite within seven (7) calendar
days of the date of the inspection. The qualified inspector shall also take
digital photographs, with date stamp, that clearly show the condition of the
practice(s) after the corrective action has been completed. The qualified
inspector shall attach paper color copies of the digital photographs to the
inspection report that documents the completion of the corrective action
work within seven (7) calendar days of that inspection.
5. Within one business day of the completion of an inspection, the qualified
inspector shall notify the owner or operator and appropriate contractor or
subcontractor identified in Part III.A.6. of this permit of any corrective actions
that need to be taken. The contractor or subcontractor shall begin implementing
the corrective actions within one business day of this notification and shall
complete the corrective actions in a reasonable time frame.
6. All inspection reports shall be signed by the qualified inspector. Pursuant to
Part I I.D.2. of this permit, the inspection reports shall be maintained on site with
the SWPPP.
Part V. TERMINATION OF PERMIT COVERAGE
A. Termination of Permit Coverage
1. An owner or operator that is eligible to terminate coverage under this permit
must submit a completed NOT form to the address in Part 11.13.1 of this permit.
The NOT form shall be one which is associated with this permit, signed in
accordance with Part VII.H of this permit.
2. An owner or operator may terminate coverage when one or more the following
conditions have been met:
a. Total project completion - All construction activity identified in the SWPPP
has been completed; and all areas of disturbance have achieved final
stabilization; and all temporary, structural erosion and sediment control
measures have been removed; and all post-construction stormwater
management practices have been constructed in conformance with the
SWPPP and are operational;
29
(Part V.A.2.b)
b. Planned shutdown with partial project completion - All soil disturbance
activities have ceased; and all areas disturbed as of the project shutdown
date have achieved final stabilization; and all temporary, structural erosion
and sediment control measures have been removed; and all post-
construction stormwater management practices required for the completed
portion of the project have been constructed in conformance with the
SWPPP and are operational;
c. A new owner or operator has obtained coverage under this permit in
accordance with Part I I.F. of this permit.
d. The owner or operator obtains coverage under an alternative SPDES
general permit or an individual SPDES permit.
3. For construction activities meeting subdivision 2a. or 2b. of this Part, the owner
or operator shall have the qualified inspector perform a final site inspection
prior to submitting the NOT. The qualified inspector shall, by signing the "Final
Stabilization" and "Post-Construction Stormwater Management Practice
certification statements on the NOT, certify that all the requirements in Part
V.A.2.a. or b. of this permit have been achieved.
4. For construction activities that are subject to the requirements of a regulated,
traditional land use control MS4 and meet subdivision 2a. or 2b. of this Part, the
owner or operator shall have the regulated, traditional land use control MS4
sign the "MS4 Acceptance" statement on the NOT in accordance with the
requirements in Part VII.H. of this permit. The regulated, traditional land use
control MS4 official, by signing this statement, has determined that it is
acceptable for the owner or operator to submit the NOT in accordance with the
requirements of this Part. The regulated, traditional land use control MS4 can
make this determination by performing a final site inspection themselves or by
accepting the qualified inspector's final site inspection certification(s) required
in Part V.A.3. of this permit.
5. For construction activities that require post-construction stormwater
management practices and meet subdivision 2a. of this Part, the owner or
operator must, prior to submitting the NOT, ensure one of the following:
a. the post-construction stormwater management practice(s) and any right-of-
way(s) needed to maintain such practice(s) have been deeded to the
municipality in which the practice(s) is located,
30
(Part V.A.5.b)
b. an executed maintenance agreement is in place with the municipality that
will maintain the post-construction stormwater management practice(s),
c. for post-construction stormwater management practices that are privately
owned, the owner or operator has a mechanism in place that requires
operation and maintenance of the practice(s) in accordance with the
operation and maintenance plan, such as a deed covenant in the owner or
operator's deed of record,
d. for post-construction stormwater management practices that are owned by
a public or private institution (e.g. school, university, hospital), government
agency or authority, or public utility; the owner or operator has policy and
procedures in place that ensures operation and maintenance of the
practices in accordance with the operation and maintenance plan.
Part VI. REPORTING AND RETENTION RECORDS
A. Record Retention
The owner or operator shall retain a copy of the NOI, NOI
Acknowledgment Letter, SWPPP, MS4 SWPPP Acceptance form and any inspection
reports that were prepared in conjunction with this permit for a period of at least five (5)
years from the date that the Department receives a complete NOT submitted in
accordance with Part V. of this general permit.
B. Addresses
With the exception of the NOI, NOT, and MS4 SWPPP Acceptance form (which must
be submitted to the address referenced in Part 11.13.1 of this permit), all written
correspondence requested by the Department, including individual permit applications,
shall be sent to the address of the appropriate DOW Water (SPDES) Program contact
at the Regional Office listed in Appendix F.
Part VII. STANDARD PERMIT CONDITIONS
A. Duty to Comply
The owner or operator must comply with all conditions of this permit. All contractors
and subcontractors associated with the project must comply with the terms of the
SWPPP. Any non-compliance with this permit constitutes a violation of the Clean Water
31
(Part VI LA)
Act (CWA) and the ECL and is grounds for an enforcement action against the owner or
operator and/or the contractor/subcontractor; permit revocation, suspension or
modification; or denial of a permit renewal application. Upon a finding of significant non-
compliance with this permit or the applicable SWPPP, the Department may order an
immediate stop to all construction activity at the site until the non-compliance is
remedied. The stop work order shall be in writing, shall describe the non-compliance in
detail, and shall be sent to the owner or operator.
If any human remains or archaeological remains are encountered during excavation,
the owner or operator must immediately cease, or cause to cease, all construction
activity in the area of the remains and notify the appropriate Regional Water Engineer
(RWE). Construction activity shall not resume until written permission to do so has been
received from the RWE.
B. Continuation of the Expired General Permit
This permit expires five (5) years from the effective date. If a new general permit is not
issued prior to the expiration of this general permit, an owner or operator with coverage
under this permit may continue to operate and discharge in accordance with the terms
and conditions of this general permit, if it is extended pursuant to the State
Administrative Procedure Act and 6 NYCRR Part 621, until a new general permit is
issued.
C. Enforcement
Failure of the owner or operator, its contractors, subcontractors, agents and/or assigns
to strictly adhere to any of the permit requirements contained herein shall constitute a
violation of this permit. There are substantial criminal, civil, and administrative penalties
associated with violating the provisions of this permit. Fines of up to $37,500 per day
for each violation and imprisonment for up to fifteen (15) years may be assessed
depending upon the nature and degree of the offense.
D. Need to Halt or Reduce Activity Not a Defense
It shall not be a defense for an owner or operator in an enforcement action that it would
have been necessary to halt or reduce the construction activity in order to maintain
compliance with the conditions of this permit.
32
(Part VILE)
E. Duty to Mitigate
The owner or operator and its contractors and subcontractors shall take all reasonable
steps to minimize or prevent any discharge in violation of this permit which has a
reasonable likelihood of adversely affecting human health or the environment.
F. Duty to Provide Information
The owner or operator shall furnish to the Department, within a reasonable specified
time period of a written request, all documentation necessary to demonstrate eligibility
and any information to determine compliance with this permit or to determine whether
cause exists for modifying or revoking this permit, or suspending or denying coverage
under this permit, in accordance with the terms and conditions of this permit. The NOI,
SWPPP and inspection reports required by this permit are public documents that the
owner or operator must make available for review and copying by any person within five
(5) business days of the owner or operator receiving a written request by any such
person to review these documents. Copying of documents will be done at the
requester's expense.
G. Other Information
When the owner or operator becomes aware that they failed to submit any relevant
facts, or submitted incorrect information in the NOI or in any of the documents required
by this permit , or have made substantive revisions to the SWPPP (e.g. the scope of the
project changes significantly, the type of post-construction stormwater management
practice(s) changes, there is a reduction in the sizing of the post-construction
stormwater management practice, or there is an increase in the disturbance area or
impervious area), which were not reflected in the original NOI submitted to the
Department, they shall promptly submit such facts or information to the Department
using the contact information in Part I I.A. of this permit. Failure of the owner or operator
to correct or supplement any relevant facts within five (5) business days of becoming
aware of the deficiency shall constitute a violation of this permit.
H. Signatory Requirements
1. All NOls and NOTs shall be signed as follows:
a. For a corporation these forms shall be signed by a responsible corporate
officer. For the purpose of this section, a responsible corporate officer
means:
33
(Part VII.H.1.a)
(i) a president, secretary, treasurer, or vice-president of the corporation in
charge of a principal business function, or any other person who
performs similar policy or decision-making functions for the
corporation; or
(ii) the manager of one or more manufacturing, production or operating
facilities, provided the manager is authorized to make management
decisions which govern the operation of the regulated facility including
having the explicit or implicit duty of making major capital investment
recommendations, and initiating and directing other comprehensive
measures to assure long term environmental compliance with
environmental laws and regulations; the manager can ensure that the
necessary systems are established or actions taken to gather complete
and accurate information for permit application requirements; and
where authority to sign documents has been assigned or delegated to
the manager in accordance with corporate procedures;
b. For a partnership or sole proprietorship these forms shall be signed by a
general partner or the proprietor, respectively; or
c. For a municipality, State, Federal, or other public agency these forms shall
be signed by either a principal executive officer or ranking elected official.
For purposes of this section, a principal executive officer of a Federal
agency includes:
(i) the chief executive officer of the agency, or
(ii) a senior executive officer having responsibility for the overall
operations of a principal geographic unit of the agency (e.g., Regional
Administrators of EPA).
2. The SWPPP and other information requested by the Department shall be
signed by a person described in Part VII.H.1. of this permit or by a duly
authorized representative of that person. A person is a duly authorized
representative only if:
a. The authorization is made in writing by a person described in Part VII.H.1.
of this permit;
b. The authorization specifies either an individual or a position having
responsibility for the overall operation of the regulated facility or activity,
such as the position of plant manager, operator of a well or a well field,
34
(Part VII.H.2.b)
superintendent, position of equivalent responsibility, or an individual or
position having overall responsibility for environmental matters for the
company. (A duly authorized representative may thus be either a named
individual or any individual occupying a named position) and,
c. The written authorization shall include the name, title and signature of the
authorized representative and be attached to the SWPPP.
3. All inspection reports shall be signed by the qualified inspector that performs
the inspection.
4. The MS4 SWPPP Acceptance form shall be signed by the principal executive
officer or ranking elected official from the regulated, traditional land use control
MS4, or by a duly authorized representative of that person.
It shall constitute a permit violation if an incorrect and/or improper signatory
authorizes any required forms, SWPPP and/or inspection reports.
I. Property Rights
The issuance of this permit does not convey any property rights of any sort, nor any
exclusive privileges, nor does it authorize any injury to private property nor any invasion
of personal rights, nor any infringement of Federal, State or local laws or regulations.
Owners or operators must obtain any applicable conveyances, easements, licenses
and/or access to real property prior to commencing construction activity.
J. Severability
The provisions of this permit are severable, and if any provision of this permit, or the
application of any provision of this permit to any circumstance, is held invalid, the
application of such provision to other circumstances, and the remainder of this permit
shall not be affected thereby.
K. Requirement to Obtain Coverage Under an Alternative Permit
1. The Department may require any owner or operator authorized by this permit to
apply for and/or obtain either an individual SPDES permit or another SPDES
general permit. When the Department requires any discharger authorized by a
general permit to apply for an individual SPDES permit, it shall notify the
discharger in writing that a permit application is required. This notice shall
35
(Part VII.K.1)
include a brief statement of the reasons for this decision, an application form,
a statement setting a time frame for the owner or operator to file the
application for an individual SPDES permit, and a deadline, not sooner than
180 days from owner or operator receipt of the notification letter, whereby the
authorization to discharge under this general permit shall be terminated.
Applications must be submitted to the appropriate Permit Administrator at the
Regional Office. The Department may grant additional time upon
demonstration, to the satisfaction of the Department, that additional time to
apply for an alternative authorization is necessary or where the Department
has not provided a permit determination in accordance with Part 621 of this
Title.
2. When an individual SPDES permit is issued to a discharger authorized to
discharge under a general SPDES permit for the same discharge(s), the
general permit authorization for outfalls authorized under the individual
SPDES permit is automatically terminated on the effective date of the
individual permit unless termination is earlier in accordance with 6 NYCRR
Part 750.
L. Proper Operation and Maintenance
The owner or operator shall at all times properly operate and maintain all facilities and
systems of treatment and control (and related appurtenances) which are installed or
used by the owner or operator to achieve compliance with the conditions of this permit
and with the requirements of the SWPPP.
M. Inspection and Entry
The owner or operator shall allow an authorized representative of the Department,
EPA, applicable county health department, or, in the case of a construction site which
discharges through an MS4, an authorized representative of the MS4 receiving the
discharge, upon the presentation of credentials and other documents as may be
required by law, to:
1. Enter upon the owner's or operator's premises where a regulated facility or
activity is located or conducted or where records must be kept under the
conditions of this permit;
2. Have access to and copy at reasonable times, any records that must be kept
under the conditions of this permit; and
36
(Part VII.M.3)
3. Inspect at reasonable times any facilities or equipment (including monitoring
and control equipment), practices or operations regulated or required by this
permit.
4. Sample or monitor at reasonable times, for purposes of assuring permit
compliance or as otherwise authorized by the Act or ECL, any substances or
parameters at any location.
N. Permit Actions
This permit may, at any time, be modified, suspended, revoked, or renewed by the
Department in accordance with 6 NYCRR Part 621. The filing of a request by the
owner or operatorfor a permit modification, revocation and reissuance, termination, a
notification of planned changes or anticipated noncompliance does not limit, diminish
and/or stay compliance with any terms of this permit.
O. Definitions
Definitions of key terms are included in Appendix A of this permit.
P. Re-Opener Clause
1. If there is evidence indicating potential or realized impacts on water quality
due to any stormwater discharge associated with construction activity covered
by this permit, the owner or operator of such discharge may be required to
obtain an individual permit or alternative general permit in accordance with
Part VII.K. of this permit or the permit may be modified to include different
limitations and/or requirements.
2. Any Department initiated permit modification, suspension or revocation will be
conducted in accordance with 6 NYCRR Part 621, 6 NYCRR 750-1.18, and 6
NYCRR 750-1.20.
Q. Penalties for Falsification of Forms and Reports
n accordance with 6NYCRR Part 750-2.4 and 750-2.5, any person who knowingly
makes any false material statement, representation, or certification in any application,
record, report or other document filed or required to be maintained under this permit,
including reports of compliance or noncompliance shall, upon conviction, be punished
in accordance with ECL §71-1933 and or Articles 175 and 210 of the New York State
Penal Law.
37
(Part A I.R)
R. Other Permits
Nothing in this permit relieves the owner or operator from a requirement to obtain any
other permits required by law.
38
APPENDIX A— Acronyms and Definitions
Acronyms
APO —Agency Preservation Officer
BMP — Best Management Practice
CPESC — Certified Professional in Erosion and Sediment Control
Cpv— Channel Protection Volume
CWA— Clean Water Act (or the Federal Water Pollution Control Act, 33 U.S.C. §1251 et
seq)
DOW — Division of Water
EAF — Environmental Assessment Form
ECL - Environmental Conservation Law
EPA— U. S. Environmental Protection Agency
HSG — Hydrologic Soil Group
MS4 — Municipal Separate Storm Sewer System
NOI — Notice of Intent
NOT — Notice of Termination
NPDES — National Pollutant Discharge Elimination System
OPRHP — Office of Parks, Recreation and Historic Places
Qf— Extreme Flood
Qp — Overbank Flood
RRv— Runoff Reduction Volume
RWE — Regional Water Engineer
SEAR— State Environmental Quality Review
SEQRA - State Environmental Quality Review Act
SHPA— State Historic Preservation Act
SPDES — State Pollutant Discharge Elimination System
SWPPP — Stormwater Pollution Prevention Plan
TMDL — Total Maximum Daily Load
UPA— Uniform Procedures Act
USDA— United States Department of Agriculture
WQv—Water Quality Volume
39
Appendix A
Definitions
All definitions in this section are solely for the purposes of this permit.
Agricultural Building — a structure designed and constructed to house farm
implements, hay, grain, poultry, livestock or other horticultural products; excluding any
structure designed, constructed or used, in whole or in part, for human habitation, as a
place of employment where agricultural products are processed, treated or packaged,
or as a place used by the public.
Agricultural Property—means the land for construction of a barn, agricultural building,
silo, stockyard, pen or other structural practices identified in Table II in the "Agricultural
Management Practices Catalog for Nonpoint Source Pollution in New York State"
prepared by the Department in cooperation with agencies of New York Nonpoint Source
Coordinating Committee (dated June 2007).
Alter Hydrology from Pre to Post-Development Conditions - means the post-
development peak flow rate(s) has increased by more than 5% of the pre-developed
condition for the design storm of interest (e.g. 10 yr and 100 yr).
Combined Sewer - means a sewer that is designed to collect and convey both
"sewage" and "stormwater".
Commence (Commencement of) Construction Activities - means the initial
disturbance of soils associated with clearing, grading or excavation activities; or other
construction related activities that disturb or expose soils such as demolition, stockpiling
of fill material, and the initial installation of erosion and sediment control practices
required in the SWPPP. See definition for "Construction Activity(ies)" also.
Construction Activity(ies) - means any clearing, grading, excavation, filling, demolition
or stockpiling activities that result in soil disturbance. Clearing activities can include, but
are not limited to, logging equipment operation, the cutting and skidding of trees, stump
removal and/or brush root removal. Construction activity does not include routine
maintenance that is performed to maintain the original line and grade, hydraulic
capacity, or original purpose of a facility.
Construction Site — means the land area where construction activity(ies) will occur.
See definition for "Commence (Commencement ot) Construction Activities"and "Larger
Common Plan of Development or Sale"also.
Dewatering — means the act of draining rainwater and/or groundwater from building
foundations, vaults or excavations/trenches.
Direct Discharge (to a specific surface waterbody) - means that runoff flows from a
construction site by overland flow and the first point of discharge is the specific surface
wate rbod y, or runoff flows from a construction site to a separate storm sewer system
40
Appendix A
and the first point of discharge from the separate storm sewer system is the specific
surface waterbody.
Discharge(s) - means any addition of any pollutant to waters of the State through an
outlet or point source.
Embankment—means an earthen or rock slope that supports a road/highway.
Endangered or Threatened Species — see 6 NYCRR Part 182 of the Department's
rules and regulations for definition of terms and requirements.
Environmental Conservation Law (ECL) - means chapter 43-B of the Consolidated
Laws of the State of New York, entitled the Environmental Conservation Law.
Equivalent (Equivalence) — means that the practice or measure meets all the
performance, longevity, maintenance, and safety objectives of the technical standard
and will provide an equal or greater degree of water quality protection.
Final Stabilization - means that all soil disturbance activities have ceased and a
uniform, perennial vegetative cover with a density of eighty (80) percent over the entire
pervious surface has been established; or other equivalent stabilization measures, such
as permanent landscape mulches, rock rip-rap or washed/crushed stone have been
applied on all disturbed areas that are not covered by permanent structures, concrete or
pavement.
General SPDES permit - means a SPDES permit issued pursuant to 6 NYCRR Part
750-1.21 and Section 70-0117 of the ECL authorizing a category of discharges.
Groundwater(s) - means waters in the saturated zone. The saturated zone is a
subsurface zone in which all the interstices are filled with water under pressure greater
than that of the atmosphere. Although the zone may contain gas-filled interstices or
interstices filled with fluids other than water, it is still considered saturated.
Historic Property— means any building, structure, site, object or district that is listed on
the State or National Registers of Historic Places or is determined to be eligible for
listing on the State or National Registers of Historic Places.
Impervious Area (Cover) - means all impermeable surfaces that cannot effectively
infiltrate rainfall. This includes paved, concrete and gravel surfaces (i.e. parking lots,
driveways, roads, runways and sidewalks); building rooftops and miscellaneous
impermeable structures such as patios, pools, and sheds.
Infeasible — means not technologically possible, or not economically practicable and
achievable in light of best industry practices.
41
Appendix A
Larger Common Plan of Development or Sale - means a contiguous area where
multiple separate and distinct construction activities are occurring, or will occur, under
one plan. The term "plan" in "larger common plan of development or sale" is broadly
defined as any announcement or piece of documentation (including a sign, public notice
or hearing, marketing plan, advertisement, drawing, permit application, State
Environmental Quality Review Act (SEQRA) environmental assessment form or other
documents, zoning request, computer design, etc.) or physical demarcation (including
boundary signs, lot stakes, surveyor markings, etc.) indicating that construction
activities may occur on a specific plot.
For discrete construction projects that are located within a larger common plan of
development or sale that are at least 1/4 mile apart, each project can be treated as a
separate plan of development or sale provided any interconnecting road, pipeline or
utility project that is part of the same "common plan" is not concurrently being disturbed.
Minimize — means reduce and/or eliminate to the extent achievable using control
measures (including best management practices) that are technologically available and
economically practicable and achievable in light of best industry practices.
Municipal Separate Storm Sewer (MS4) - a conveyance or system of conveyances
(including roads with drainage systems, municipal streets, catch basins, curbs, gutters,
ditches, man-made channels, or storm drains):
(i) Owned or operated by a State, city, town, borough, county, parish, district,
association, or other public body (created by or pursuant to State law) having
jurisdiction over disposal of sewage, industrial wastes, stormwater, or other
wastes, including special districts under State law such as a sewer district,
flood control district or drainage district, or similar entity, or an Indian tribe or
an authorized Indian tribal organization, or a designated and approved
management agency under section 208 of the CWA that discharges to
surface waters of the State;
(ii) Designed or used for collecting or conveying stormwater;
(iii) Which is not a combined sewer; and
(iv) Which is not part of a Publicly Owned Treatment Works (POTW) as defined
at 40 C F R 122.2.
National Pollutant Discharge Elimination System (NPDES) - means the national
system for the issuance of wastewater and stormwater permits under the Federal Water
Pollution Control Act (Clean Water Act).
Natural Buffer—means an undisturbed area with natural cover running along a surface
water (e.g. wetland, stream, river, lake, etc.).
New Development— means any land disturbance that does not meet the definition of
Redevelopment Activity included in this appendix.
42
Appendix A
New York State Erosion and Sediment Control Certificate Program — a certificate
program that establishes and maintains a process to identify and recognize individuals
who are capable of developing, designing, inspecting and maintaining erosion and
sediment control plans on projects that disturb soils in New York State. The certificate
program is administered by the New York State Conservation District Employees
Association.
NOI Acknowledgment Letter - means the letter that the Department sends to an
owner or operator to acknowledge the Department's receipt and acceptance of a
complete Notice of Intent. This letter documents the owner's or operator's authorization
to discharge in accordance with the general permit for stormwater discharges from
construction activity.
Nonpoint Source - means any source of water pollution or pollutants which is not a
discrete conveyance or point source permitted pursuant to Title 7 or 8 of Article 17 of
the Environmental Conservation Law (see ECL Section 17-1403).
Overbank —means flow events that exceed the capacity of the stream channel and spill
out into the adjacent floodplain.
Owner or Operator - means the person, persons or legal entity which owns or leases
the property on which the construction activity is occurring; an entity that has
operational control over the construction plans and specifications, including the ability to
make modifications to the plans and specifications; and/or an entity that has day-to-day
operational control of those activities at a project that are necessary to ensure
compliance with the permit conditions.
Performance Criteria — means the design criteria listed under the "Required Elements"
sections in Chapters 5, 6 and 10 of the technical standard, New York State Stormwater
Management Design Manual, dated January 2015. It does not include the Sizing
Criteria (i.e. WQv, RRv, Cpv, Qp and Qf ) in Part I.C.2. of the permit.
Point Source - means any discernible, confined and discrete conveyance, including but
not limited to any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container,
rolling stock, concentrated animal feeding operation, vessel or other floating craft, or
landfill leachate collection system from which pollutants are or may be discharged.
Pollutant - means dredged spoil, filter backwash, solid waste, incinerator residue,
sewage, garbage, sewage sludge, munitions, chemical wastes, biological materials,
radioactive materials, heat, wrecked or discarded equipment, rock, sand and industrial,
municipal, agricultural waste and ballast discharged into water; which may cause or
might reasonably be expected to cause pollution of the waters of the state in
contravention of the standards or guidance values adopted as provided in 6 NYCRR
Parts 700 et seq .
43
Appendix A
Qualified Inspector - means a person that is knowledgeable in the principles and
practices of erosion and sediment control, such as a licensed Professional Engineer,
Certified Professional in Erosion and Sediment Control (CPESC), Registered
Landscape Architect, New York State Erosion and Sediment Control Certificate
Program holder or other Department endorsed individual(s).
It can also mean someone working under the direct supervision of, and at the same
company as, the licensed Professional Engineer or Registered Landscape Architect,
provided that person has training in the principles and practices of erosion and sediment
control. Training in the principles and practices of erosion and sediment control means
that the individual working under the direct supervision of the licensed Professional
Engineer or Registered Landscape Architect has received four (4) hours of Department
endorsed training in proper erosion and sediment control principles from a Soil and
Water Conservation District, or other Department endorsed entity. After receiving the
initial training, the individual working under the direct supervision of the licensed
Professional Engineer or Registered Landscape Architect shall receive four (4) hours of
training every three (3) years.
It can also mean a person that meets the Qualified Professional qualifications in
addition to the Qualified Inspector qualifications.
Note: Inspections of any post-construction stormwater management practices that
include structural components, such as a dam for an impoundment, shall be performed
by a licensed Professional Engineer.
Qualified Professional - means a person that is knowledgeable in the principles and
practices of stormwater management and treatment, such as a licensed Professional
Engineer, Registered Landscape Architect or other Department endorsed individual(s).
Individuals preparing SWPPPs that require the post-construction stormwater
management practice component must have an understanding of the principles of
hydrology, water quality management practice design, water quantity control design,
and, in many cases, the principles of hydraulics. All components of the SWPPP that
involve the practice of engineering, as defined by the NYS Education Law (see Article
145), shall be prepared by, or under the direct supervision of, a professional engineer
licensed to practice in the State of New York.
Redevelopment Activity(ies) — means the disturbance and reconstruction of existing
impervious area, including impervious areas that were removed from a project site within
five (5)years of preliminary project plan submission to the local government (i.e. site plan,
subdivision, etc.).
Regulated, Traditional Land Use Control MS4 - means a city, town or village with
land use control authority that is authorized to discharge under New York State DEC's
44
Appendix A
SPDES General Permit For Stormwater Discharges from Municipal Separate
Stormwater Sewer Systems (MS4s) or the City of New York's Individual SPDES Permit
for their Municipal Separate Storm Sewer Systems (NY-0287890).
Routine Maintenance Activity - means construction activity that is performed to
maintain the original line and grade, hydraulic capacity, or original purpose of a facility,
including, but not limited to:
■ Re-grading of gravel roads or parking lots,
■ Cleaning and shaping of existing roadside ditches and culverts that maintains
the approximate original line and grade, and hydraulic capacity of the ditch,
■ Cleaning and shaping of existing roadside ditches that does not maintain the
approximate original grade, hydraulic capacity and purpose of the ditch if the
changes to the line and grade, hydraulic capacity or purpose of the ditch are
installed to improve water quality and quantity controls (e.g. installing grass
lined ditch),
■ Placement of aggregate shoulder backing that stabilizes the transition between
the road shoulder and the ditch or embankment,
■ Full depth milling and filling of existing asphalt pavements, replacement of
concrete pavement slabs, and similar work that does not expose soil or disturb
the bottom six (6) inches of subbase material,
■ Long-term use of equipment storage areas at or near highway maintenance
facilities,
■ Removal of sediment from the edge of the highway to restore a previously
existing sheet-flow drainage connection from the highway surface to the
highway ditch or embankment,
■ Existing use of Canal Corp owned upland disposal sites for the canal, and
■ Replacement of curbs, gutters, sidewalks and guide rail posts.
Site limitations — means site conditions that prevent the use of an infiltration technique
and or infiltration of the total WQv. Typical site limitations include: seasonal high
groundwater, shallow depth to bedrock, and soils with an infiltration rate less than 0.5
inches/hour. The existence of site limitations shall be confirmed and documented using
actual field testing (i.e. test pits, soil borings, and infiltration test) or using information
from the most current United States Department of Agriculture (USDA) Soil Survey for
the County where the project is located.
Sizing Criteria — means the criteria included in Part I.C.2 of the permit that are used to
size post-construction stormwater management control practices. The criteria include;
Water Quality Volume (WQv), Runoff Reduction Volume (RRv), Channel Protection
Volume (Cpv), Overbank Flood (Qp), and Extreme Flood (Qf).
State Pollutant Discharge Elimination System (SPDES) - means the system
established pursuant to Article 17 of the ECL and 6 NYCRR Part 750 for issuance of
permits authorizing discharges to the waters of the state.
45
Appendix A
Steep Slope — means land area designated on the current United States Department of
Agriculture ("USDA") Soil Survey as Soil Slope Phase "D", (provided the map unit name
is inclusive of slopes greater than 25%) , or Soil Slope Phase E or F, (regardless of the
map unit name), or a combination of the three designations.
Streambank — as used in this permit, means the terrain alongside the bed of a creek or
stream. The bank consists of the sides of the channel, between which the flow is confined.
Stormwater Pollution Prevention Plan (SWPPP) — means a project specific report,
including construction drawings, that among other things: describes the construction
activity(ies), identifies the potential sources of pollution at the construction site; describes
and shows the stormwater controls that will be used to control the pollutants (i.e. erosion
and sediment controls; for many projects, includes post-construction stormwater
management controls); and identifies procedures the owner or operator will implement to
comply with the terms and conditions of the permit. See Part III of the permit for a
complete description of the information that must be included in the SWPPP.
Surface Waters of the State - shall be construed to include lakes, bays, sounds,
ponds, impounding reservoirs, springs, rivers, streams, creeks, estuaries, marshes,
inlets, canals, the Atlantic ocean within the territorial seas of the state of New York and
all other bodies of surface water, natural or artificial, inland or coastal, fresh or salt,
public or private (except those private waters that do not combine or effect a junction
with natural surface waters), which are wholly or partially within or bordering the state
or within its jurisdiction. Waters of the state are further defined in 6 NYCRR Parts 800 to
941.
Temporarily Ceased — means that an existing disturbed area will not be disturbed
again within 14 calendar days of the previous soil disturbance.
Temporary Stabilization - means that exposed soil has been covered with material(s)
as set forth in the technical standard, New York Standards and Specifications for
Erosion and Sediment Control, to prevent the exposed soil from eroding. The materials
can include, but are not limited to, mulch, seed and mulch, and erosion control mats
(e.g. jute twisted yarn, excelsior wood fiber mats).
Total Maximum Daily Loads (TMDLs) - A TMDL is the sum of the allowable loads of a
single pollutant from all contributing point and nonpoint sources. It is a calculation of the
maximum amount of a pollutant that a waterbody can receive on a daily basis and still
meet water quality standards, and an allocation of that amount to the pollutant's
sources. A TMDL stipulates wasteload allocations (WLAs) for point source discharges,
load allocations (LAs) for nonpoint sources, and a margin of safety (MOS).
Trained Contractor - means an employee from the contracting (construction) company,
identified in Part III.A.6., that has received four (4) hours of Department endorsed
46
Appendix A
training in proper erosion and sediment control principles from a Soil and Water
Conservation District, or other Department endorsed entity. After receiving the initial
training, the trained contractor shall receive four (4) hours of training every three (3)
years.
It can also mean an employee from the contracting (construction) company, identified in
Part III.A.6., that meets the qualified inspector qualifications (e.g. licensed Professional
Engineer, Certified Professional in Erosion and Sediment Control (CPESC), Registered
Landscape Architect, New York State Erosion and Sediment Control Certificate
Program holder, or someone working under the direct supervision of, and at the same
company as, the licensed Professional Engineer or Registered Landscape Architect,
provided they have received four (4) hours of Department endorsed training in proper
erosion and sediment control principles from a Soil and Water Conservation District, or
other Department endorsed entity).
The trained contractor is responsible for the day to day implementation of the SWPPP.
Uniform Procedures Act (UPA) Permit - means a permit required under 6 NYCRR
Part 621 of the Environmental Conservation Law (ECL), Article 70.
Water Quality Standard - means such measures of purity or quality for any waters in
relation to their reasonable and necessary use as promulgated in 6 NYCRR Part 700 et
seq.
47
APPENDIX B — Required SWPPP Components by Project Type
Table 1
Construction Activities that Require the Preparation of a SWPPP That Only
Includes Erosion and Sediment Controls
The following construction activities that involve soil disturbances of one (1) or more acres of
land, but less than five (5) acres:
• Single family home not located in one of the watersheds listed in Appendix C or not directly
discharging to one of the 303(d) segments listed in Appendix E
• Single family residential subdivisions with 25% or less impervious cover at total site build-out and
not located in one of the watersheds listed in Appendix C and not directly discharging to one of the
303(d) segments listed in Appendix E
• Construction of a barn or other agricultural building, silo, stock yard or pen.
The following construction activities that involve soil disturbances between five thousand (5000)
square feet and one (1) acre of land:
All construction activities located in the watersheds identified in Appendix D that involve soil
disturbances between five thousand (5,000) square feet and one (1) acre of land.
The following construction activities that involve soil disturbances of one (1) or more acres of
land:
• Installation of underground, linear utilities; such as gas lines, fiber-optic cable, cable TV,
electric, telephone, sewer mains, and water mains
• Environmental enhancement projects, such as wetland mitigation projects, stormwater retrofits and
stream restoration projects
• Pond construction
• Linear bike paths running through areas with vegetative cover, including bike paths surfaced with an
impervious cover
• Cross-country ski trails and walking/hiking trails
• Sidewalk, bike path or walking path projects, surfaced with an impervious cover, that are not part of
residential, commercial or institutional development;
• Sidewalk, bike path or walking path projects, surfaced with an impervious cover, that include
incidental shoulder or curb work along an existing highway to support construction of the sidewalk,
bike path or walking path.
• Slope stabilization projects
• Slope flattening that changes the grade of the site, but does not significantly change the runoff
characteristics
48
Appendix B
Table 1 (Continued) CONSTRUCTION ACTIVITIES THAT REQUIRE THE PREPARATION OF A
SWPPP
THAT ONLY INCLUDES EROSION AND SEDIMENT CONTROLS
The following construction activities that involve soil disturbances of one (1) or more acres of
land:
• Spoil areas that will be covered with vegetation
• Vegetated open space projects (i.e. recreational parks, lawns, meadows, fields, downhill ski trails)
excluding projects that alter hydrology from pre to post development conditions,
• Athletic fields (natural grass)that do not include the construction or reconstruction of impervious
area and do not alter hydrology from pre to post development conditions
• Demolition project where vegetation will be established, and no redevelopment is planned
• Overhead electric transmission line project that does not include the construction of permanent
access roads or parking areas surfaced with impervious cover
• Structural practices as identified in Table II in the "Agricultural Management Practices Catalog for
Nonpoint Source Pollution in New York State", excluding projects that involve soil disturbances of
greater than five acres and construction activities that include the construction or reconstruction of
impervious area
• Temporary access roads, median crossovers, detour roads, lanes, or other temporary impervious
areas that will be restored to pre-construction conditions once the construction activity is complete
49
Appendix B
Table 2
CONSTRUCTION ACTIVITIES THAT REQUIRE THE PREPARATION OF A SWPPP THAT INCLUDES
POST-CONSTRUCTION STORMWATER MANAGEMENT PRACTICES
The following construction activities that involve soil disturbances of one (1) or more acres of
land:
• Single family home located in one of the watersheds listed in Appendix C or directly discharging to
one of the 303(d)segments listed in Appendix E
• Single family home that disturbs five (5)or more acres of land
• Single family residential subdivisions located in one of the watersheds listed in Appendix C or
directly discharging to one of the 303(d)segments listed in Appendix E
• Single family residential subdivisions that involve soil disturbances of between one (1)and five (5)
acres of land with greater than 25% impervious cover at total site build-out
• Single family residential subdivisions that involve soil disturbances of five (5) or more acres of land,
and single family residential subdivisions that involve soil disturbances of less than five (5) acres
that are part of a larger common plan of development or sale that will ultimately disturb five or more
acres of land
• Multi-family residential developments; includes duplexes, townhomes, condominiums, senior
housing complexes, apartment complexes, and mobile home parks
• Airports
• Amusement parks
• Breweries, cideries, and wineries, including establishments constructed on agricultural land
• Campgrounds
• Cemeteries that include the construction or reconstruction of impervious area (>5% of disturbed
area)or alter the hydrology from pre to post development conditions
• Commercial developments
• Churches and other places of worship
• Construction of a barn or other agricultural building(e.g. silo) and structural practices as identified in
Table II in the "Agricultural Management Practices Catalog for Nonpoint Source Pollution in New
York State"that include the construction or reconstruction of impervious area, excluding projects
that involve soil disturbances of less than five acres.
• Golf courses
• Institutional development; includes hospitals, prisons, schools and colleges
• Industrial facilities; includes industrial parks
• Landfills
• Municipal facilities; includes highway garages, transfer stations, office buildings, POTW's, water
treatment plants, and water storage tanks
• Office complexes
• Playgrounds that include the construction or reconstruction of impervious area
• Sports complexes
• Racetracks; includes racetracks with earthen (dirt)surface
• Road construction or reconstruction, including roads constructed as part of the construction
activities listed in Table 1
50
Appendix B
Table 2 (Continued)
CONSTRUCTION ACTIVITIES THAT REQUIRE THE PREPARATION OF A SWPPP THAT INCLUDES
POST-CONSTRUCTION STORMWATER MANAGEMENT PRACTICES
The following construction activities that involve soil disturbances of one (1) or more acres of
land:
• Parking lot construction or reconstruction, including parking lots constructed as part of the
construction activities listed in Table 1
• Athletic fields (natural grass)that include the construction or reconstruction of impervious area (>5%
of disturbed area) or alter the hydrology from pre to post development conditions
• Athletic fields with artificial turf
• Permanent access roads, parking areas, substations, compressor stations and well drilling pads,
surfaced with impervious cover, and constructed as part of an over-head electric transmission line
project, wind-power project, cell tower project, oil or gas well drilling project, sewer or water main
project or other linear utility project
• Sidewalk, bike path or walking path projects, surfaced with an impervious cover, that are part of a
residential, commercial or institutional development
• Sidewalk, bike path or walking path projects, surfaced with an impervious cover, that are part of a
highway construction or reconstruction project
• All other construction activities that include the construction or reconstruction of impervious area or
alter the hydrology from pre to post development conditions, and are not listed in Table 1
51
APPENDIX C — Watersheds Requiring Enhanced Phosphorus Removal
Watersheds where owners or operators of construction activities identified in
Table 2 of Appendix B must prepare a SWPPP that includes post-construction
stormwater management practices designed in conformance with the Enhanced
Phosphorus Removal Standards included in the technical standard, New York
State Stormwater Management Design Manual ("Design Manual").
• Entire New York City Watershed located east of the Hudson River - Figure 1
• Onondaga Lake Watershed - Figure 2
• Greenwood Lake Watershed -Figure 3
• Oscawana Lake Watershed — Figure 4
• Kinderhook Lake Watershed — Figure 5
52
Appendix C
Figure 1 - New York City Watershed East of the Hudson
EEKMAN
EAST FISHKILL
PAWLING
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53
Appendix C
Figure 2 - Onondaga Lake Watershed
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54
Appendix C
Figure 3 - Greenwood Lake Watershed
WARWICK �
GREENWOOD LAKE
0 Phosphorus Watershed
55
Appendix C
Figure 4 - Oscawana Lake Watershed
PHILIPSTOWN
LKENT .
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Phosphorus Watershed
56
Appendix C
Figure 5 - Kinderhook Lake Watershed
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57
APPENDIX D — Watersheds with Lower Disturbance Threshold
Watersheds where owners or operators of construction activities that involve soil
disturbances between five thousand (5000) square feet and one (1) acre of land
must obtain coverage under this permit.
Entire New York City Watershed that is located east of the Hudson River - See Figure
1 in Appendix C
58
APPENDIX E — 303(d) Segments Impaired by Construction Related Pollutant(s)
List of 303(d) segments impaired by pollutants related to construction activity(e.g. silt, sediment
or nutrients). The list was developed using "The Final New York State 2016 Section 303(d) List
of Impaired Waters Requiring a TMDL/Other Strategy" dated November 2016. Owners or
operators of single family home and single family residential subdivisions with 25% or less total
impervious cover at total site build-out that involve soil disturbances of one or more acres of
land, but less than 5 acres, and directly discharge to one of the listed segments below shall
prepare a SWPPP that includes post-construction stormwater management practices designed
in conformance with the New York State Stormwater Management Design Manual ("Design
Manual"), dated January 2015.
COUNTY WATERBODY POLLUTANT
Albany Ann Lee (Shakers) Pond, Stump Pond Nutrients
Albany Basic Creek Reservoir Nutrients
Allegany Amity Lake, Saunders Pond Nutrients
Bronx Long Island Sound, Bronx Nutrients
Bronx Van Cortlandt Lake Nutrients
Broome Fly Pond, Deer Lake, Sky Lake Nutrients
Broome Minor Tribs to Lower Susquehanna (north) Nutrients
Broome Whitney Point Lake/Reservoir Nutrients
Cattaraugus Allegheny River/Reservoir Nutrients
Cattaraugus Beaver (Alma) Lake Nutrients
Cattaraugus Case Lake Nutrients
Cattaraugus Linlyco/Club Pond Nutrients
Cayuga Duck Lake Nutrients
Cayuga Little Sodus Bay Nutrients
Chautauqua Bear Lake Nutrients
Chautauqua Chadakoin River and tribs Nutrients
Chautauqua Chautauqua Lake, North Nutrients
Chautauqua Chautauqua Lake, South Nutrients
Chautauqua Findley Lake Nutrients
Chautauqua Hulburt/Clymer Pond Nutrients
Clinton Great Chazy River, Lower, Main Stem Silt/Sediment
Clinton Lake Champlain, Main Lake, Middle Nutrients
Clinton Lake Champlain, Main Lake, North Nutrients
Columbia Kinderhook Lake Nutrients
Columbia Robinson Pond Nutrients
Cortland Dean Pond Nutrients
59
303(d) Segments Impaired by Construction Related Pollutant(s)
Dutchess Fall Kill and tribs Nutrients
Dutchess Hillside Lake Nutrients
Dutchess Wappingers Lake Nutrients
Dutchess Wappingers Lake Silt/Sediment
Erie Beeman Creek and tribs Nutrients
Erie Ellicott Creek, Lower, and tribs Silt/Sediment
Erie Ellicott Creek, Lower, and tribs Nutrients
Erie Green Lake Nutrients
Erie Little Sister Creek, Lower, and tribs Nutrients
Erie Murder Creek, Lower, and tribs Nutrients
Erie Rush Creek and tribs Nutrients
Erie Scajaquada Creek, Lower, and tribs Nutrients
Erie Scajaquada Creek, Middle, and tribs Nutrients
Erie Scajaquada Creek, Upper, and tribs Nutrients
Erie South Branch Smoke Cr, Lower, and tribs Silt/Sediment
Erie South Branch Smoke Cr, Lower, and tribs Nutrients
Essex Lake Champlain, Main Lake, South Nutrients
Essex Lake Champlain, South Lake Nutrients
Essex Willsboro Bay Nutrients
Genesee Bigelow Creek and tribs Nutrients
Genesee Black Creek, Middle, and minor tribs Nutrients
Genesee Black Creek, Upper, and minor tribs Nutrients
Genesee Bowen Brook and tribs Nutrients
Genesee LeRoy Reservoir Nutrients
Genesee Oak Orchard Cr, Upper, and tribs Nutrients
Genesee Tonawanda Creek, Middle, Main Stem Nutrients
Greene Schoharie Reservoir Silt/Sediment
Greene Sleepy Hollow Lake Silt/Sediment
Herkimer Steele Creek tribs Silt/Sediment
Herkimer Steele Creek tribs Nutrients
Jefferson Moon Lake Nutrients
Kings Hendrix Creek Nutrients
Kings Prospect Park Lake Nutrients
Lewis Mill Creek/South Branch, and tribs Nutrients
Livingston Christie Creek and tribs Nutrients
Livingston Conesus Lake Nutrients
Livingston Mill Creek and minor tribs Silt/Sediment
Monroe Black Creek, Lower, and minor tribs Nutrients
Monroe Buck Pond Nutrients
Monroe Cranberry Pond Nutrients
60
303(d) Segments Impaired by Construction Related Pollutant(s)
Monroe Lake Ontario Shoreline, Western Nutrients
Monroe Long Pond Nutrients
Monroe Mill Creek and tribs Nutrients
Monroe Mill Creek/Blue Pond Outlet and tribs Nutrients
Monroe Minor Tribs to Irondequoit Bay Nutrients
Monroe Rochester Embayment- East Nutrients
Monroe Rochester Embayment-West Nutrients
Monroe Shipbuilders Creek and tribs Nutrients
Monroe Thomas Creek/White Brook and tribs Nutrients
Nassau Beaver Lake Nutrients
Nassau Camaans Pond Nutrients
Nassau East Meadow Brook, Upper, and tribs Silt/Sediment
Nassau East Rockaway Channel Nutrients
Nassau Grant Park Pond Nutrients
Nassau Hempstead Bay Nutrients
Nassau Hempstead Lake Nutrients
Nassau Hewlett Bay Nutrients
Nassau Hog Island Channel Nutrients
Nassau Long Island Sound, Nassau County Waters Nutrients
Nassau Massapequa Creek and tribs Nutrients
Nassau Milburn/Parsonage Creeks, Upp, and tribs Nutrients
Nassau Reynolds Channel,west Nutrients
Nassau Tidal Tribs to Hempstead Bay Nutrients
Nassau Tribs (fresh)to East Bay Nutrients
Nassau Tribs (fresh)to East Bay Silt/Sediment
Nassau Tribs to Smith/Halls Ponds Nutrients
Nassau Woodmere Channel Nutrients
New York Harlem Meer Nutrients
New York The Lake in Central Park Nutrients
Niagara Bergholtz Creek and tribs Nutrients
Niagara Hyde Park Lake Nutrients
Niagara Lake Ontario Shoreline, Western Nutrients
Niagara Lake Ontario Shoreline, Western Nutrients
Oneida Ballou, Nail Creeks and tribs Nutrients
Onondaga Harbor Brook, Lower, and tribs Nutrients
Onondaga Ley Creek and tribs Nutrients
Onondaga Minor Tribs to Onondaga Lake Nutrients
Onondaga Ninemile Creek, Lower, and tribs Nutrients
Onondaga Onondaga Creek, Lower, and tribs Nutrients
Onondaga Onondaga Creek, Middle, and tribs Nutrients
61
303(d) Segments Impaired by Construction Related Pollutant(s)
Onondaga Onondaga Lake, northern end Nutrients
Onondaga Onondaga Lake, southern end Nutrients
Ontario Great Brook and minor tribs Silt/Sediment
Ontario Great Brook and minor tribs Nutrients
Ontario Hemlock Lake Outlet and minor tribs Nutrients
Ontario Honeoye Lake Nutrients
Orange Greenwood Lake Nutrients
Orange Monhagen Brook and tribs Nutrients
Orange Orange Lake Nutrients
Orleans Lake Ontario Shoreline,Western Nutrients
Orleans Lake Ontario Shoreline, Western Nutrients
Oswego Lake Neata hwa nta Nutrients
Oswego Pleasant Lake Nutrients
Putnam Bog Brook Reservoir Nutrients
Putnam Boyd Corners Reservoir Nutrients
Putnam Croton Falls Reservoir Nutrients
Putnam Diverting Reservoir Nutrients
Putnam East Branch Reservoir Nutrients
Putnam Lake Carmel Nutrients
Putnam Middle Branch Reservoir Nutrients
Putnam Oscawana Lake Nutrients
Putnam Palmer Lake Nutrients
Putnam West Branch Reservoir Nutrients
Queens Bergen Basin Nutrients
Queens Flushing Creek/Bay Nutrients
Queens Jamaica Bay, Eastern, and tribs (Queens) Nutrients
Queens Kissena Lake Nutrients
Queens Meadow Lake Nutrients
Queens Willow Lake Nutrients
Rensselaer Nassau Lake Nutrients
Rensselaer Snyders Lake Nutrients
Richmond Grasmere Lake/Bradys Pond Nutrients
Rockland Congers Lake, Swartout Lake Nutrients
Rockland Rockland Lake Nutrients
Saratoga Ballston Lake Nutrients
Saratoga Dwaas Kill and tribs Silt/Sediment
Saratoga Dwaas Kill and tribs Nutrients
Saratoga Lake Lonely Nutrients
Saratoga Round Lake Nutrients
LSa Tribs to Lake Lonely Nutrients
62
303(d) Segments Impaired by Construction Related Pollutant(s)
Schenectady Collins Lake Nutrients
Schenectady Duane Lake Nutrients
Schenectady Mariaville Lake Nutrients
Schoharie Engleville Pond Nutrients
Schoharie Summit Lake Nutrients
Seneca Reeder Creek and tribs Nutrients
Stlawrence Black Lake Outlet/Black Lake Nutrients
Stlawrence Fish Creek and minor tribs Nutrients
Steuben Smith Pond Nutrients
Suffolk Agawam Lake Nutrients
Suffolk Big/Little Fresh Ponds Nutrients
Suffolk Canaan Lake Silt/Sediment
Suffolk Canaan Lake Nutrients
Suffolk Flanders Bay,West/Lower Sawmill Creek Nutrients
Suffolk Fresh Pond Nutrients
Suffolk Great South Bay, East Nutrients
Suffolk Great South Bay, Middle Nutrients
Suffolk Great South Bay, West Nutrients
Suffolk Lake Ronkonkoma Nutrients
Suffolk Long Island Sound, Suffolk County, West Nutrients
Suffolk Mattituck (Marratooka) Pond Nutrients
Suffolk Meetinghouse/Terrys Creeks and tribs Nutrients
Suffolk Mill and Seven Ponds Nutrients
Suffolk Millers Pond Nutrients
Suffolk Moriches Bay, East Nutrients
Suffolk Moriches Bay, West Nutrients
Suffolk Peconic River, Lower, and tidal tribs Nutrients
Suffolk Quantuck Bay Nutrients
Suffolk Shinnecock Bay and Inlet Nutrients
Suffolk Tidal tribs to West Moriches Bay Nutrients
Sullivan Bodine, Montgomery Lakes Nutrients
Sullivan Davies Lake Nutrients
Sullivan Evens Lake Nutrients
Sullivan Pleasure Lake Nutrients
Tompkins Cayuga Lake, Southern End Nutrients
Tompkins Cayuga Lake, Southern End Silt/Sediment
Tompkins Owasco Inlet, Upper, and tribs Nutrients
Ulster Ashokan Reservoir Silt/Sediment
Ulster Esopus Creek, Upper, and minor tribs Silt/Sediment
Warren Hague Brook and tribs Silt/Sediment
63
303(d) Segments Impaired by Construction Related Pollutant(s)
Warren Huddle/Finkle Brooks and tribs Silt/Sediment
Warren Indian Brook and tribs Silt/Sediment
Warren Lake George Silt/Sediment
Warren Tribs to L.George, Village of L George Silt/Sediment
Washington Cossayuna Lake Nutrients
Washington Lake Champlain, South Bay Nutrients
Washington Tribs to L.George, East Shore Silt/Sediment
Washington Wood Cr/Champlain Canal and minor tribs Nutrients
Wayne Port Bay Nutrients
Westchester Amawalk Reservoir Nutrients
Westchester Blind Brook, Upper, and tribs Silt/Sediment
Westchester Cross River Reservoir Nutrients
Westchester Lake Katonah Nutrients
Westchester Lake Lincolndale Nutrients
Westchester Lake Meahagh Nutrients
Westchester Lake Mohegan Nutrients
Westchester Lake Shenorock Nutrients
Westchester Long Island Sound, Westchester(East) Nutrients
Westchester Mamaroneck River, Lower Silt/Sediment
Westchester Mamaroneck River, Upper, and minor tribs Silt/Sediment
Westchester Muscoot/Upper New Croton Reservoir Nutrients
Westchester New Croton Reservoir Nutrients
Westchester Peach Lake Nutrients
Westchester Reservoir No.1 (Lake Isle) Nutrients
Westchester Saw Mill River, Lower, and tribs Nutrients
Westchester Saw Mill River, Middle, and tribs Nutrients
Westchester Sheldrake River and tribs Silt/Sediment
Westchester Sheldrake River and tribs Nutrients
Westchester Silver Lake Nutrients
Westchester Teatown Lake Nutrients
Westchester Titicus Reservoir Nutrients
Westchester Truesdale Lake Nutrients
Westchester Wallace Pond Nutrients
Wyoming Java Lake Nutrients
Wyoming Silver Lake Nutrients
64
APPENDIX F — List of NYS DEC Regional Offices
DIVISION"now
OF DIVISION OF
R COVERING THE ENVIRONMENTAL (DOW)
FOL OWING COUNTIES: PERMITS (DEP) WATER - PROGRAM
&a 4LERMIT ADMINISTRATORS
A?, L ir V& L
50 CIRCLE ROAD 50 CIRCLE ROAD
NASSAU AND SUFFOLK STONY BROOK,NY 11790 STONY BROOK,NY 11790-3409
TEL.(631)444-0365 TEL.(631)444-0405
t
1 HUNTERS POINT PLAZA, 1 HUNTERS POINT PLAZA,
2 BRONX,KINGS,NEW YORK, 47-40 21 ST ST. 47-40 21 ST ST.
QUEENS AND RICHMOND LONG ISLAND CITY,NY 11101-5407 LONG ISLAND CITY,NY 11101-5407
TEL.(718)482-4997 TEL.(718)482-4933
DUTCHESS,ORANGE,PUTNAM, 21 SOUTH PUTT CORNERS ROAD 100 HILLSIDE AVENUE,SUITE 1 W
3 ROCKLAND,SULLIVAN,ULSTER NEW PALTZ,NY 12561-1696 WHITE PLAINS,NY 10603
AND WESTCHESTER TEL.(845)256-3059 TEL.(914)428-2505
ALBANY,COLUMBIA,
DELAWARE,GREENE, 1150 NORTH WESTCOTT ROAD 1130 NORTH WESTCOTT ROAD
4 MONTGOMERY,OTSEGO, SCHENECTADY,NY 12306-2014 SCHENECTADY,NY 12306-2014
RENSSELAER,SCHENECTADY TEL.(518)357-2069 TEL.(518)357-2045
AND SCHOHARIE
CLINTON,ESSEX,FRANKLIN, 1115 STATE ROUTE 86, PO BOX 296 232 GOLF COURSE ROAD
5 FULTON,HAMILTON, RAY BROOK,NY 12977-0296 WARRENSBURG,NY 12885-1172 TEL.
SARATOGA,WARREN AND TEL.(518)897-1234 (518)623-1200
WASHINGTON
r
HERKIMER,JEFFERSON, STATE OFFICE BUILDING STATE OFFICE BUILDING
6 LEWIS,ONEIDA AND 317 WASHINGTON STREET 207 GENESEE STREET
ST.LAWRENCE WATERTOWN,NY 13601-3787 UTICA, NY 13501-2885 TEL.(315)
TEL.(315)785-2245 793-2554
4-
BROOME,CAYUGA,
CHENANGO,CORTLAND, 615 ERIE BLVD.WEST 615 ERIE BLVD.WEST
7 MADISON,ONONDAGA, SYRACUSE, NY 13204-2400 SYRACUSE,NY 13204-2400
OSWEGO,TIOGA AND TEL.(315)426-7438 TEL.(315)426-7500
TOMPKINS
CHEMUNG,GENESEE,
LIVINGSTON,MONROE, 6274 EAST AVON-LIMA 6274 EAST AVON-LIMA RD.
8 ONTARIO,ORLEANS, ROADAVON,NY 14414-9519 AVON, NY 14414-9519
SC H UYLE R,S E N ECA, TEL.(585)226-2466 TEL.(585)226-2466
STEUBEN,WAYNE AND
YATES
ALLEGANY, 270 MICHIGAN AVENUE 270 MICHIGAN AVENUE
9 CATTARAUGUS, BUFFALO,NY 14203-2999 BUFFALO,NY 14203-2999
CHAUTAUQUA,ERIE, TEL.(716)851-7165 TEL.(716)851-7070
NIAGARA AND WYOMING
65