HomeMy WebLinkAboutSewage Collection Treatment Plan of StudyTH~NRY .~IOUI'HIrR ENGINEERING CO.
PLAN OF STUDY
FISHERS ISLAND, N. Y.
Prepared By
THE HENRY SOUTHER ENGINEERING CO.
BLOOMFIELD, CONN.
3une 1977
THai[NeY ~OUTHIrR ENGINEERING
TABLE OF CONTENTS
1. FACILITY PLANNING AREA
1.1 Planning Area and Political
3urisdiotion
1.2 Entities that will Conduct the
Planning
2. NATURE AND SCOPE OF THE PROBLEM
2.1 Exiet£ng System
2.2 Nature of the Problem
TASKS, SCHEDULE, AND COSTS
Paqe
1
5
6
7
8
Not
ATTACHMENT:
Engineering Report to Fishers Island
Development Corp.
THIIONRY ~OUTHER ENGINEERING CO.
PLAN OF STUDY
FISHERS ISLAND, N. Y.
This Plan of Study is prepared subeequent to a meeting held
with representatives of Federal and State Environmental Agencies,
Fishera Ieland Development Corporation and The Henry Souther
Engineering Co. It was decided at that meeting that the Plan of*
Study would cover the entire island even though the only part
that has a eewage collection system is the Fort Wright Area in
the weetern end of the ialand.
1. FACILITY PLANNING AREA
1.1 Planning Area and Political 3urisdiction
Fishers Island is located approximately three miles off the
southern shore of Connecticut in Long Island Sound and is within
the boundaries of the State.of New York. Its totaI area comprises
about 75 square miies. The island serves primarily aa a summer
resort area. However, some residences are ail year round.
Fishers Isiand is a part of the Town of Southold. The centraI
government is in Southold, LoI. The island is divided into two
parts; One part is pubiicaliy owned with controi by the Town, of
Southold, together with private homes in this area. Ali the
municipai duties, such as maintenance of roads, are done by the
Town of Southold in this area. The area inciudes the Fo~t Wright
area, Hay Harbor and West Harbor, ail located in the western part
of the island. A gate separates the eastern part of the isIand
from the western part. The eastern part of the isIand is entirely
privateiy owned and operated. The Town of Southoid does not
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TH/~IFNRY SOLITH~rR IrNGINI'IeRING CO.
provide any municipal services. However, the town has political
jurisdiction over the eastern part of the island as well.~ The
location of the 9ate is shown in Figure 1. Also shown in Figure
1 is the facility planning area, which is known as the Fort Wright
area.
The
island
In the
exists
population of the Fort Wright area and of the entire
fluctuates considerably in the summer and winter months.
Fort Wright area, where the only sewage collection system
in the entire island, winter, or off-season, and summer,
or peak season, populations are estimated to be about 180 and
350 respectively. For the entire island, the off-season and peak
season population is estimated to be about 350 and 2,500 respec~
tively. Thesa figures were determined by counting the number of
dwelling units and assuming.four persons per dwelling unit. The
population in the island has not increased appreciably within the
last ten years and it is anticipated that the population growth
in the future will be rather slow, if any.
As stated previously, the only sewage collection system in
the i~land exists in the Fo~t Wright area. A map of the collec-
tion system, showing pipe sizes and manholes, is given in Appendix
~. As shown in this map, pipe sizes range from 6-inch to 24-inch.
There is no treatment facility. A 24-inch outfall pipe discharges
raw sewage into Long Island Sound. The Henry Souther Engineering
Company was retained to study the system and recommend a treatment
facility that would provide at least a secondary treatment to the
sewage before its discharge. A copy of the Engineering Report is
~*Appendi~ A is'given'at'the end of the Engin~erin~ Report
THI SOU'[HER ~'NGINE~'RING CO.
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given as an attachment to this Plan of Study. Further details
of the existing distribution syatem can be obtained from this
Engineering Report, particularly under the section titled
"Existing Conditions."
With the exception of the Fort Wright area, the rest of the
residential units in the island utilize cesspools and septic
tanks for on-site disposal of sewage. Seepage testa made through-
out the island have indicated that the permeability of the soil
is suitable for on-site subsurface disposal systems. For the
eastern part of the island, where zonin9 regulations require
building lots to be at least 2 acres or more, no sewage disposal
problems should be expected with the soil types that are en-
countered.
In the western part of the island, that is to the west of the
gate, the population is more concentrated. Even though the popu-
lation is concentrated in the area between West Harbor and Hay
Harbor, no problems with individual subsurface disposal systems
have been reported or encountered. If any further aewering is to
be cohsidered in the island,'the area between West Harbor and Hay
Harbor would be the only logical area to be studied.
The primary source of water supply in the island is Barlow
Pond. This pond is located in the middle of the island and has
always supplied sufficient water for most summer periods. There
is a secondary source of supply in Middle Farms Pond. This pond
is located to the east of Barlow Pond. Water is pumped from
THI ~'NRY SOUTH£R ENGINEERING CO.
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Middle Farms Pond into Barlow Pond when necessary. A portable
pump is used for this purpose. There is aisc a well water sup-
ply consisting of two deep weIls. However, these wells have
never been used in the past. They are iocated by Middle Farms
Pond. Water obtained from Bariow Pond is fiitered in a water
treatment piant which has a capacity of about 0.5 mgd. This is'
an old piant, constructed in i927. It consists of two filter
beds, chiorination and pH adjustment. The fiitered water is
pumped into 500,O00-galion elevated storage tanks where it is
distributed to both the eastern and western parts of the island.
A iO-inch pipe brings water from the storage tank into the area
between West Harbor and Hay Harbor, and from this area a 6-inch
pipe euppiies water to the Fort Wright area, or the facility
pIanning area. The piping system for the island was etarted in
the eariy 1900's. Consequentiy, the pipes are probably badiy
corroded and tubercuiated as at times, low pressures are en-
countered when the water use in the isiand is at its peak. Not
all of the houses in the island, however, are supplied with
fiit~red water. Some have their own individual well suppIies.
As stated previousiy, the ieiand is mostly a summer resort
ieiand although there are year-round residents. There is an
association called "Fishers Island Civic Association," organized
to"promote the economic, civic and social welfare of the island."
This organization is trying "to keep an eye on all Iocal develop-
ments and problems."
NRY SOUTHER ENGINEERING CO.
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Outside of the remains of the World War II fortifications
in the western end of the island near Silver Eel Cove, there
there are no historical sites or monuments that would be affected
directly or indirectly by any development in the island.
1.2 Entities that will Conduct the Planning
The Town of Southold is in the process of forming a Sewer
District. This Oistrict will be in charge of sewage collection,
treatment and disposal systems loc the facility planning area,
which is the Fort Wright area. The personnel in charge of the
District uill rsport directly to the Town 8oard. The Town 8oard,
with its six members, is the 9overnin9 body in the Town of
Southold. The six-Town 8oard members consist of one Supervisor,
three Town 3ustices and two Councilmen.- The Supervisor will act
as a representative for the Town Board in matters dealing with
the grant appIication. The Town Board will authorize the Super-
visor to do so on their behalf.
The SuffoIk County Dept. of Environmentai Controi is the
state agency having authority and jurisdiction on the quality
of wastewater discharges in Fishers Island. In 1974, the State
of New York Dept. of Environmental Conservation issued an Order
to Fishers Island Development Corp. to "take ali the steps neces-
sary for the instaliation of a sewage treatment system," and
discontinue discharging untreated raw sewage into Long Island
Sound. The raw sewage in question is the discharge from the'
.existing collection system in the Fort Wright area. The fiIe
number of this Order is 2005. Attached to this Order was a
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TH~I;NRY gOUTHER ENGIN~rERING CO.
compliance schedule setting a deadline for submission of an
engineering report, final plans and specifications and comple-
tion of construction; consequently, the cessation of discharge
of all untreated wastewaters. This compliance schedule uae
amended on February 3, 1975. Pursuant
Order, Fishers Island Development Corp.
Souther Engineering Co. to assist them
to the receipt of this
retained The Henry
to comply with the terms
of the Order. The Henry Southec Engineering Co. subsequently
prepared an Engineering Report and submitted it to the Suffolk
County DEC. This report quantifies the rates of sewage flows
in the collection system service area and proposes a treatment
scheme. Detailed description of the existing system and the
proposed treatment scheme as well as the cost of construction of
the proposed treatment system are given in the Engineering Report.
2. NATURE AND SCOPE OF THE PROBLEM
2.1 Existing System
Description of major features of the existing collection
systems is given in the Engineering Report presented as Attach-
ment A. At the present time, there are two outfall pipes. The
small outfall, which is to the north of Silver Eel Cove, is an
8-inch outfall, partially broken, and the
24-inch outfall where the location of the
proposed. The small outfall structure is
major outfall is a
treatment facility is
proposed to be abandoned
and the wastewater in this area pumped into the collection system
leading to the proposed treatment facility.
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T~IENRY SOUTHER ENGINEEFIING
2.2 Nature of the Problem
The sewage collection system is an old system, collecting
sewage from a totally residential area (no commercial or in-
dustrial establishments exist) and discharges, without any
treatment, into Long Island Sound. Laboratory tests on samples
collected from the outfall pipe indicate high 8OD, suspended
solids and coliform organism count. The problem, therefore, is
to provide at leaet a secondary treatment to the sewage before
it is discharged into the
raw sewage into the Sound
concern.
Sound. The existing discharge of
is the cause of serious environmental
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3. TASKS, SCHEDULE, AND COSTS
Preparation of the Facility Plan will entail
tasks:
Effort
Task (Man-Weeks)
1. Effluent Limitations
(to be provided by the State)
2.
Assess Current Situation
a. Evaluate existing system
(Optimum Performance)
b. Planning Area Description
c. Demographic and Economic Data
d. Water Quality Data
e. Environmental Inventory
(including cultural resources)
f. Infiltration/Inflow Analysis
lO
Assess Future Situation
a. Future environment with
"No Action"
b. Land Uss Projections
Co Demographic and Economic
Projections
d. Flow and Wasteload' Forecasts
(8asis for Industrial Flow
Forecasts)
Develop and Evaluate Alternatives
a. Alternative 8PWTT Waste
Management Techniques
(Expanding and Upgrading Exist-
in9 System, Regional Solutions,
Alternative Treatment Sizes and
Configurations, Alternative
Residual Waste Management
Techniques; Environmental
Effects)
b. Public Participation
6
Select Plan~
a. Public Meetings and Hearings
b. Environmental Impacts of
Selected Plan
c. Summary of Public Participation
the following
Schedule
Costs
3,000
300
350
800
400
6,000
1,200
500
500
1,000
6,000
1,200
600
1,200
600
1 2 3 4 5 6 7
Months
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TASKS, SCHEDULE, AND COSTS (CONT'D)
Task
Effort
(Man-Weeks)
Schedule
Preliminary Design of
Selected Treatment Works
a. Full Process Design Layout,
Design Criteria, Sizing,
Loading Rates, Detention
Times
b. Detailed Cost Estimates
(Design, Construction, and
Operatson & Maintenance)
1
Implementation Arrangements
a. Institutional and Legal
Requirements
b. Preliminary Operation
& Maintenance Plan
c. Non-Federal Costs, User
Charges and Debt-Service
Charges
d. Financial Arran9ements
to meet Non-Federal
Costs
e, Resolutions of Pian
Acceptance
2
Archaelogical Survey
Report Preparation and
Printing
Costs
1,200
1,200
'1,200
2,400
6O0
2,400
$32,650
1 2 3 4 5 5 ?
Months
FACILITIES PLANNING AREA
("FORT WRIGHT AREA")
18
GATE
30 '
30
/5'
12.
6
IZ
FIG
FISHERS ISLAND,N Y
FACILITIES PLANNING AREA
SCALE I"=1000'
THE NENRY $OUTHER ENGINEER~NC= CO.
24TOBE¥ RD BLOOMFIELD CT. 0(,005