HomeMy WebLinkAbout2006
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REPORT
ON THE
WASTEWATER SYSTEM
OPERATION AND MAINTENANCE
FOR THE
FISHERS ISLAND
SEWER DISTRICT
BY:
MICHAEL A. HORNE, M.S., P.E.
DTC PROJECT NO. 06-187-200
OCTOBER 2006
DIVERSIFIED TECHNOLOGY CONSULTANTS
556 WASHINGTON AVENUE
NORTH HAVEN, CT 06473
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INDEX
Introduction.. .................................. ..................... ........... ......... Page 1
Background ............................................................................ Page 2
System General Description................................................... Page 2
Maintenance and Operation ................................................... Page 3
. General........................................................................ Page 3
. Pump Station ............................................................... Page 3
Community Septic System ..................................................... Page 4
Septic Tanks........................................................................... Page 4
. Community System Tanks........................................... Page 4
. Cinema Tank ............................................................... Page 5
. Coast Guard Houses Tank .......................................... Page 5
Silver Eel Cove System .......................................................... Page 5
Sewage Collection System..................................................... Page 5
Conclusions and Recommendations ...................................... Page 6
. Conclusions ................................................................. Page 6
. Recommendations....................................................... Page 7
Enclosure # 1 Maintenance Check List
Enclosure # 2 Discharge Monitoring Report - Field Report, June 19, 2006
Enclosure # 3 Discharge Monitoring Report DEC - June 23, 2006
Enclosure # 4 Operation and Maintenance Field Report - October 17, 2006
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INTRODUCTION
This report is written to conform with the requirements which were outlined in Item II of our
contract with the Town of Southold on behalf of the Fishers Island Sewer District. It
includes maintenance evaluations of the Fishers Island sewer district sewers, the pump
station and wet well, the community leaching systems, the Cinema septic system and the
septic system which serves the three residences which overlook Silver Eel Cove. In
addition, the pump station and selected sewers were reviewed. Tests of pump station flow
were conducted to determine the pump capacities. The Community, Silver Eel Cove and
Cinema Subsurface Disposal Systems were inspected and septage, as well as effluent,
were measured. During this year, day-to-day operation and maintenance was provided by
Harold's Construction Co. in accordance with the Contract with the Town of Southold.
The collection system in the area of Officer's Service Road has been added to the annual
review because of sewer clogging in the sanitary manholes during the past several years.
The results of the collection system review are enclosed in Enclosure 4 "Operation and
Maintenance Field Report October 17, 2006."
The purpose of the field evaluations and this report are to assure continued operation and
maintenance of the system and control operation costs, especially electrical and
replacement costs. It should be noted that due to the age of the system and corrosion,
some major items must be replaced. In order to assist the operator and fulfill a need, a
maintenance checklist has been included in this report. (Reference Enclosure # 1). This
checklist is tailored to normal operation and maintenance requirements.
Although the collection system has functioned well in the past, it will need several manhole
repairs to prevent clogging and backups. Conditions have changed since our smoke
testing program about fifteen years ago.
Attempts have been made to secure funding to remove five (5) catch basins from the
system. In order to accommodate a proposed community center, the stormwater must be
eliminated from the system.
Fishers Island Sewer District
Report on the Wastewater System
Operation and Maintenance
During 2006
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BACKGROUND
The Fishers Island sewer district includes the area of the south end of Fishers Island, which
was established during World War II as Fort Wright.
Based upon the 1943 Corps of Engineers map of the system, the sewer system consists of
about two miles of vitrified clay pipe, ranging from 6 inches in diameter to 24 inches. Prior
to 1985, a 24-inch diameter outfall sewer extended into Long Island Sound where raw
wastewater was discharged. The map was traced by the Suffolk County Planning
Department during 1964. Several copies of this map have been reproduced by DTC and
sent to Louisa Evans for the District's file and to Harold's Construction Co. for their use.
The residents, the highway department, the Fishers Island Water Department and others
can obtain utility information from the maps.
During the late 1970's and early 1980's F.I.D.C.O. purchased the Fort Wright area from the
Government, and the New York Department of Environmental Conservation (N.Y.D.E.C.)
issued an order to Southold to eliminate the discharge to the Sound. A wastewater facilities
plan, which included an activated sludge treatment plant system, was initially proposed. It
was concluded that a plant would result in excessive operation and maintenance.
Therefore, the current pump station and community septic system was developed,
designed and constructed in compliance with the order. The flow of wastewater into Long
Island Sound was eliminated. On-going operation and maintenance is in compliance with
N.Y.D.E.C. requirements. The system has consistently met N.Y.D.E.C. discharge
monitoring requirements. (See the Discharge Monitoring Report [DMR]). (Reference:
Enclosures #2 and #3).
SYSTEM GENERAL DESCRIPTION
The alternate community septic system scheme was accepted by the N.Y.D.E.C. This plan,
which was implemented during 1985, included installing a pump station adjacent to and
connecting the 24-inch diameter outfall to it via an 8-inch PVC line, plugging the 24-inch
outfall, constructing a large subsurface disposal system near the airport, constructing
another large subsurface disposal system to serve the Cinema and finally, construction of a
subsurface disposal system to serve the three houses which are on the hill above Silver Eel
Cove. The systems were constructed during 1985. Therefore, they are more than 20 years
old. Considering the ages of the systems and mechanical/electrical equipment, they have
served the residents well. Maintenance of the system become more important as the
system ages.
Fishers Island Sewer District
Report on the Wastewater System
Operation and Maintenance
During 2006
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MAINTENANCE AND OPERA TION
GENERAL
This section addresses maintenance and operation of the system. The Town of Southold
has contracted Harold's Construction Co. to maintain the system with consultation and
specifications as needed from DTC. Harold's has operated and maintained the system for
years and personnel are familiar with it. During two field reviews of 2006, Harold Cook and
his personnel assisted in obtaining access to facilities, testing them obtaining
measurements and relating important performance information about the system. In
addition, during 2006 Harold's has continued to provide services during periods of system
failures.
The maintenance requirements for the system in order of effort required are: 1) The pump
station and generator, 2) The community leaching field, 3) The sewer collection system, 4)
The Cinema system, and 5) The three Silver Eel Cove residences system. They will be
addressed in the following paragraphs based upon three site visits, numerous telephone
conversations and faxes, prior knowledge of the system, and examination of plans and
specifications.
A. Pump Station
The major components of the pump station are the submersible pumps, the wet-
well, the electrical controls, the valve pit including check valves, isolation plug
valves, a by-pass valve, and the generator. The fence, gate, a small spares
storage building, grounds and electrical power distribution equipment are part of
the station.
In order to maintain the pump station and order parts, the plans and
specifications are essential.
The key maintenance requirements include continuous observation of the pumps
and wet-well, checking the valves to assure proper seating of the check valves
and operability of the plug valves, monitoring the elapsed time meters on the
pumps to assure that the pumps are both working, check of vibration of the
pumps, observation of the wet-well for excessive debris and scum, cleaning the
valve pit and wet-well, exercise the generator, replace components in the
electrical control system and (a new transducer system) when they fail or failure
is eminent, replace the generator battery as required, and control rusting of the
facility by touchup painting with rustoleum and other corrosion inhibitors. Rust
control and cabinet sealing are important because of the proximity of this pump
station to Long Island Sound.
Fishers Island Sewer District
Reporl on the Wastewater System
Operation and Maintenance
During 2006
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During June 2006 and October 2006, the writer visually inspected the pump
station and other parts of the wastewater system. The primary purpose during
June was to obtain flows for the annual Discharge Monitoring Report (DMR) for
the N.Y.D.E.C. One pump only was operating satisfactorily; the other one was
out of order. The station generator was inspected and the one pump tested at
that time. The one pump only was pumping below capacity. A new pump control
system was installed during 2005. It appears to be working satisfactory.
During October 2006, a detailed operation and maintenance inspection and test
was completed for the system. (See Enclosure # 4).
During the flow testing for the DMR, two methods were used to determine flow
into the wet-well. Based upon these measurements, it was concluded that the
north check valve (pump # 2) was not seating This allowed flow back into the
wet-well between pump cycles.
B. Community Septic System
The major component of the community septic system are three, 10,OOO-gallon
septic tanks, 4-feet. x 4-feet. deep concrete leaching galleries which form 14
rows of a flow distribution system. The wastewater flows from the pump station
to the tanks. The grit and septage are removed in the tanks where it settles to
the bottoms. The wastewater flows from the tanks into a distribution system and
into the 14 sets of leaching galleries.
The community leaching system was visited twice during June 2006 and October
2006 in order to inspect various system components.
The inlet distribution, the tanks, the outlet distribution and the 14 rows of leaching
galleys were inspected. The depths of sludge were determined. The results are
in Enclosure # 4.
Distribution to the leaching chambers was observed. (See Enclosure # 4). In
general, the western 60 foot and 100 foot long galleys were filled. The eastern
galleys were not. Inlet # 3 of the eastern 60 foot galleys had 4 inches of
wastewater in it.
Inlet 1 and 2 of the western 60 foot galleys had 4 inches and 18 inches of
wastewater in them. Inlets 2, 3 and 4 of the 100 foot galleys had 36 inches, 40
inches and 30 inches of wastewater respectively. See Enclosure # 4.
C. Septic Tanks
Community Tanks
The three 10,000 gallon tanks were pumped during 2002 to remove sludge
because they were filled to near excessive depths.
Fishers Island Sewer District
Report on the Wastewater System
Operation and Maintenance
During 2006
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During October 2006, sludge depths were measured in the three tanks.
All of the sludge depths are shown in the Field Report of October 17, 2006 (See
Enclosure # 4). Based upon the measurements, the tanks should be satisfactory
for several more years.
Cinema Tanks
The Cinema System consists of a 1,500-gallon septic tank followed by four by
four leaching chambers. Inspection of it reveals it is in excellent condition and
does not need improvements. Septage levels are very low.
Coast Guard Houses Tanks
The inlet sludge is 18 inches deep which is the same as a year ago. If a septic
truck is used for manhole cleaning or community system pumping, this should be
pumped - it is not critical.
D. Silver Eel Cove System (3 Houses)
This system serves three residences, which in the past were owned by the Coast
Guard. This system consists of a 1,500-gallon septic tank and a large precast
concrete leaching system consisting of large leaching chambers. It is in excellent
condition. No improvements are required. However, septage increased
significantly during the summer of 2004 from 12-inches to 18-inches. The
October 2006 inspection revealed that the depth remained at 18 inches. This
system may require pumping during the next several years. (See Enclosure # 4).
E. Sewage Collection System
The existing system consists of vitrified clay pipe, which normally cracks at the
bells or female fittings. Normally, groundwater flows into the system through
these cracks. This does not appear to be the case for the Fishers Island System.
However, at least four stormwater catch basins near Fox Lane are connected
into the system and contribute substantial amounts of inflow during rainstorms.
Elimination of this stormwater from the system was brought to the attention of the
Town of South hold after smoke testing the system 15 years ago. It will be
addressed in our long-term improvement report because it costs to pump it and it
taxes facilities including the community leaching field. Sanitary manholes in the
Officers Service Road were inspected October 2006. One sanitary manhole
should be pumped out because it was plugging the upstream sewer. A little
gravel should be removed from another one and the top of one near landscape
boulders should be repaired.
Fishers Island Sewer District
Reporl on the Wastewater System
Operation and Maintenance
During 2006
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F. Observations, Conclusions and Recommendations
Conclusions
During periods of non-rainfall and even during periods immediately following
rainstorms, the flow drops down. This indicates that the groundwater table is low
or it is not leaking into the sewers.
During 2001, the first clogging of the sewer with rags occurred and was resolved.
The clogging of manholes with paper, debris and pebbles has continued. The
manholes in the Officers Service Road should be monitored and cleaned before
back up occurs. (The obvious one is the service road sanitary manhole that
services the State Police Building). The manhole was observed to be clogged
and backing up into the upstream sewer. If not taken care of, this can result in
basement flooding.
The community leaching system distribution is not acceptable. The west galleys
are overloaded due to a clogged outlet to the eastern galleys.
Based upon review of October 2006, the following can be concluded:
,/ Clogged manholes in Officer's Service Road must be cleaned,
inspected and rebuilt inverts if necessary.
,/ Upstream users must refrain from flushing materials like cloth
down the toilet.
,/ The flow distribution into the three tanks was balanced.
,/ The flow out of the distribution box to the leaching field was very
bad. The east pipe was entirely clogged.
,/ Both pump lift out fixtures are severely corroded in the pump
station wet-well.
,/ Fix storage shed hinge at the pump station.
,/ Pump out of septage from the three residential system near the
Silver Eel Cove system should be considered in the event that a
septic truck is used to clean manholes or pump out the community
system.
,/ The pump # 2 check valve is faulty.
,/ Six community leaching system frames and covers are either
broken or off-set from the manholes.
,/ The pump station upgrade and stormwater elimination must be
done before the community center can discharge to the system.
,/ Pump # 2 pumped 70 gpm which is far below specification and can
result in force-main clogging.
Fishers Island Sewer District
Report on the Wastewater System
Operation and Maintenance
During 2006
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v' Much debris was on the wastewater surface in the wet-well.
v' The generator is non-operational
Recommendations
v' The pump station transducer should be in a stilling well.
v' Pump station # 1 meets specification.
v' Pump station # 2 is below specification in flow. The velocity in the
force-main is too slow to move grit. Pump # 2 must be replaced.
v' The wet-well surface is very dirty with floating debris. It must be
cleaned.
v' Remove top of check valve for pump # 2. Repair or replace it.
v' Replace generator.
v' Repair building door hinge.
v' Replace pump lift out assemblies.
v' Replace pump # 2.
v' Carry out contract operations and maintenance.
v' Remove solid soapy material from surface of wet-well.
v' Pump # 1 was installed. In order to use pump # 1, the plug valve
on pump # 2 was closed to prevent re-circulating waste water. The
check valve must be repaired.
v' Install 4inch diameter stilling well for transducer away from inlet
pipe in wet-well.
v' Replace frames and covers in community leach field - See
Enclosure # 4 - Some open manholes should be covered
immediately.
v' Unclog distribution pipe in the Bilco hatch covered distribution
chamber to balance the load to the leaching field.
v' Remove material from the manhole near the Officer's Service Road
(parallel to Whistler Avenue) and opposite the State Patrol Office
Building.
v' All of the above must be checked and tested.
8:106187 Fishes IslandlO & MlReport 2006.doc
Fishers Island Sewer District
Reporl on the Wastewater System
Operation and Maintenance
During 2006
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ENCLOSURE # 1
MAINTENANCE CHECK LIST
-------------------
FISHERS ISLAND W ASTEW ATER SYSTEM
MAINTENANCE CHECKLIST
MAINTENANCE CHECK PERIOD
ITEM DAILY WEEKLY MONTHLY OUARTERLY SEMI-ANNUALLY ANNUALLY
1. Standby Generator (include check of fuel X
level))
2. Sensors and Alarm System X
3. Power Usage Records X (DTC)
4. Flow Total X
S. Flow Rate X
6. Automatic Transfer Switch X
7. Transducer System X
8. Pumps, Motor, Controls X
9. Remove Solids from Wet-Well Liquid X
Surface
10. Exercise Plug Valves. X
11. Observe Check Valves. X
12. Main Pump Mechanical (Check Alarm Light) X
13. Station Cleanliness X
14. Check Wet-Well Solids X
IS. Check Community System Inlet Distribution X
16. Facilities Condition X
17. Mow LawnlBrush As Needed
18. Wet-Well Cleanout As Needed
19. Svstem Inspection I X (with DTC)
20. Pump Out Septic Tanks As Needed
21. Inspect Septic Svstems X (with DTC)
22. Pump Tests to Determine Capacity X (with DTC)
* In Valve Pit
Note: All weekly items can be inspected during the weekly generator start-up. Visual observations are necessary.
S:\OOIIl9\101\Report Task 2\M.inChecklilllChart.doc:
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. ENCLOSURE # 2
FIELD WORK
DISCHARGE MONITORING REPORT
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11111111,11111
....TEII
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""unUIIIS
'OL"UOIII
REPORT OF MEETING
Page 1 013
June 22, 2006
Revised: June 23, 2006
June 19, 2006
DATE
MEETING DATE
Fishers Island
LOCATION
Dale Scott, Harold's Construction Co. (part-time)
Bob Cournier, Harold's Construction Co. (start-up/shut-down)
Mike Horne, P.E., DTC
ATTENDEES
To determine Flow Rate of Wastewater and Depths of Sludge
PURPOSE
Mike Home, P.E. ~
REPORT BY
Fishers Island Discharge Monitoring Report
06-187-100
PROJECT NAME I PROJECT NUMBER
Weather: Clear
Note: Substantial rainfall prior days.
1. The flow was measured on an hourly basis using a 3 gallon bucket.
8:00 fill time ave. 24 sec. flow = 7.5 gpm
9:00 fill time ave. 32 sec flow = 5.6 gpm
10:00 fill time ave. = 7.5 gpm
11 :00 fill time ave. 43 sec. = 4.2 gpm
12:00 fill time ave. 38 sec. = 4.7 gpm
1 :00 fill time ave. 48.6 sec. = 3.7 gpm
2:45 fill time ave. 43 sec. = 4.1 gpm
3:40 fill time ave. 36 sec. = 4.9 gpm
7.66 hours
Day flow approx. ave. - 5.27 gpm
Assume infiltration = 1 gpm - 1.00 qpm
Wastewater 4.27 gpm
Note: Not winter: Not summer flow.
OIVERSIFIED TECHNOLOGY CONSULTANTS
556 WASHINGTON AVENUE NORTH HAVEN CT 05473 2032394200 2032347375 FAX
STAMFORD, CT NEW LONDON, CT ANDOVER, MA
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...'.IIIII~
."Till
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I1J1U:TIIIIIII
IOUTlO",
REPORT OF MEETING
Page 2 of 3
Some people have moved onto the island. 1 new connection
Daytime Flow = 4.27 gpm x 12 hours x 60 min. = 3,074 gal.
Nighttime Flow = 1 gpm x 12 hours x 60 min. = 720aal.
3,794 gaL/day
Community System:
Sludae Deoths Cinchesl
Tank Inlet Outlet
West 18 3
Center 21 7
East 15 Y. 3
Conclusion: Good Duma out.
Cinema System SludQe:
1 inch inlet, 1" in outlet.
Good
Silver Eel Cove Cottages:
Inlet 3" scum 18" sludge
Outlet 3" sludge
Poor, but not critical. Pump when convenient with other residential.
Review of System:
1. Community System
Inlet and outlet distribution required cleaning.
Field is in good condition based upon inspection of the manhole points on inlets.
2. Collection System
Manhole near west end of alley has some gravel in it. Not critical.
DIVERSIFIED TECHNOLOGY CONSULTANTS
556 W.6.SHINGTON AVENUE NORTH HAVEN CT 06473 2032394200 2032347376 FAX
STAMFORD, CT NEW LONDON, CT ANDOVER, MA
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JOUITIONl
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UIlUCTUII'JI
..'111
REPORT OF MEETING
Page 3 of 3
3. Pump Station
The east check valve is not seating properly. This is very critical because the
result is we re-pump the wastewater Le., it flows back into the wet-well, and is re-
pumped. The result is high energy use and a very dirty wastewater in the wet-well.
During the last operation and maintenance review, it was concluded that the second pump
must be installed. The specifications were forwarded to Harold's. It is necessary to install
another pump which should be installed as a backup. In the event the new pump lead
time is more than two weeks, the pump station will need to be by-passed to Install a
new check valve. Harold's has successfully by-passed before.
The wet-well needs cleaning by a septic truck. It has floating debris on it. Grease should be
cleaned from the transducer to prevent failure of it.
cc: The Honorable Louisa Evans
Mr. Harold Cook, Harold's Construction Co.
5:\05187 FIshes Island\Fietd Reporl\6-16-06.doc
DIVERSIFIED TECHNOLOGY CONSULTANTS
556 WASHINGTON AVENUE NORTH H,WEN CT 06473 2032394200 2032347376 FAX
STAMFORD, CT New LONDON, CT ANDOVER, MA
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ENCLOSURE # 3
DISCHARGE MONITORING REPORT
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ENGINEERED
r---~
~
lAI.jO
STRUCTURES
SOLUTIONS
WATER
June 23, 2006
Mr. Scott A. Russell
Supervisor
Town of Southold
Town Hall
53095 Main Road
Southold, New York 11971
RE: Discharge Monitoring Report
Fishers Island New York Wastewater Systems
NYS-SPDES DMRN.Y. 0.199214
DTC Project No. 06-187-100
Dear Mr. Russell:
In conformance with our contract, we are pleased to submit the Discharge Monitoring Report for the
Fishers Island Wastewater Disposal Systems. The sludge depths for the septic systems 001, 002 and 003
as shown in Table 1, and the estimated wastewater flow rates for systems 001, 002, and 003 based on
flow monitoring are shown in Table 2.
Weare sending copies to Justice Louisa Evans, as well as the listed State and County officials for their
records.
Sincerely,
DIVERSIFIED TECHNOLOGY CONSULTANTS
~.rfe
Chairman and Chief Executive Officer
~a.~
Michael A. Horne, M.S., P.E.
Associate
Enclosures:
Table I and Table 2
cc with enclosures:
Justice Louisa Evans, Esquire
Mr. Dilip BaneJjee, Department of Conservation, Region I
N. G. Kaul, Director, DEC
Mr. Isador Doroski, Suffolk County Department of Health Services
S:106187 Fishes lsland\Lettm\6-23'()6-Russell rpt.doc
DIVERSIFIED TECHNOLOGY CONSULTANTS
556 WASHINGTON AVENUE NORTH HAVEN CT 06473 2032351 4200 2032347376 fAX
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FISHER'S ISLAND W ASTEWTER SYSTEM
FACILITY ID NUMBER- NEW YORK 0.199214
TABLE 1
SHOWING SEPTIC TANK CONDITIONS FOR
SYSTEMS 001, 002 AND 003
JUNE 19, 2006
Svstem Descriotion
(001) Community Septic System
3 10,000 Gallon Concrete
Septic Tanks 12 Feet High,
10 Feet Liquid Level Depth,
20 Feet 6 Inches Long
Seotal!e Conditions
West Tank Inlet Compartment Thin Scum Layer
Outlet Compartment Negligible Scum
Middle Tank Inlet Compartment Thin Scum Layer
Outlet Compartment Thin Scum Layer
East Tank Inlet Compartment Thin Scum Layer
Outlet Compartment No Scum
(002) Cinema Septic System
I 1,500 Gallon Concrete
Septic Tank 7 Feet High
10 Feet 6 Inches Long, 5 Feet 4 Inches Liquid Depth
Seotal!e Conditions
Inlet Compartment
Outlet Compartment
No Flow in System
Thin Scum Layer
No Scum
(003) Three Cottages Septic System
1 2,000 Gallon Concrete
Septic Tank 7 Feet High,
11 Feet Long, 5 Feet 4 Inches Liquid Depth
Inlet Compartment
Outlet Compartment
3" ScumJDebris
1" Scum/Debris
8:\06187 Fi&.bcs Is1and\Lett:e:r\SepticTriTabk I.doc
18" Deep Septage
3" Deep Septage
21" Deep Septage
T Septage
15 112" Deep Septage
3" Septage
1" :I: Deep Septage
I" x Deep Septage
18" Deep Septage
3" Deep Septage
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SEPTIC SYSTEM
001
002
003
001
002
003
TABLE 2
ESTlMA TED WASTEWATER FLOWS
(SEWAGE ONLY)
SEASON
Summer
Winter
Summer
Winter
Summer
Winter
ESTIMATED TOTAL FLOWS
(INCLUDING EXTRANEOUS FLOWS)
Summer
Wmter
Summer
Winter
Summer
WInter
~~\Ot'iIrr7 Fisher; 151and\I..ettm\EstWIl~f1(lWI; T&ble2&oe
FLOW (AVERAGE
GALLONS/DA Y)
8,800 gpd
3,250 gpd
700 gpd
7 gpd
550 gpd
250 gpd
16,000 gpd
7,000 gpd
700 gpd
7 gpd
550 gpd
250 gpd
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ENCLOSURE # 4
FIELD REPORT
OPERATION AND MAINTENANCE
OCTOBER 2006
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ERG.ltEERED
~
LaRD
STRUCTURES
LETTER OF TRANSMITTAL
. SOLUTIO..
WATER
To:
Harold Cook
Harold's Construc:tion CD.
P.O. Box 661
Fishers Island, New YorK 06390
(631) 788-5550
DATE:
PROJECT No.
RE:
10/1812008
06.187.200
Fishers Island Sewer Distric:t
Field Report
WE ARE SENDING You:
11] Attached 0 UNDER SEPARATE COVER
~ COPY OF LETTER
SHOP DRAWINGS
OTHER
~ SPECIFICATIONS
CHANGE ORDER
DRAWINGS
X REPORTS
ORIGINALS/CoP] ES" DATE.." . c....; DESCRIPTION . . . . ,"0,,-, , <'c,;".:" .j;:...;'.
,-:, . i:\:"/,: ,,-- . ~~.- .
1 /0 1 0/1 7108 Field ReDort of October 1 3, 2006
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THESE ARE TRANSMITTED As CHECKED BELOW:
~ FOR ApPROVAL
X FOR YOUR USE
. As REQUESTED
FOR REVIEW AND COMMENT
~ ApPROVED AS SUBMITTED
ApPROVED AS NOTED
RETURNED FOR CORRECTIONS
OTHER
B RESUBMIT B COPIES FOR APPROVAL
SUBMIT COPIES FOR DISTRIBUTION
RETURN CORRECTED PRINTS
REMARKS:
COPY To: HONORABLE LOUISA EVANS (WITH ENCLOSURE)
FILE
SIGNED: MICHAEL A HORNE, PE,
ASSOCIATE .
IF ENCLOSURES ARE NOT AS NOTED, KINDLY NOTIFY US AT ONCE.
S:\06187 FISHES ISLANDITRANSMITTAlS\10-18-06HAROLD COOK FIELD REPr 10-1 3-06.00c
DIVERSIFIED TECHNOLOGY CONSULTANTS
556 WASHINGTON AVENUE NORTH HAVEN CT 060473 2032394200 2032304 7376 FAX
STAMFORD, CT ANDOVER, MA.
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[IlGIMEERED
W"'EII
lAND
If II l/CTVIlI.
'OLl/TID'"
FIELD REPORT
Page 1 of 4
October 17, 2006
October 13,2006
OATE
MEETING DATE
Fishers Island
LOCATION
Bob Coumeyer, Harold's Construction Co.
Mike Horne, PE, DTC
ATTENDEES
Operation and Maintenance Review
SUBJECT
/
O~;YJ/
Mike Horne, PE
REPORT BY
Fishers Island Sewer District O/M
06-187-200
PROJECT NAME I PROJECT NUMBER
1. Pump Station
Pump # 1 is south - just recently installed.
Pump # 2 is north has been installed for 4 to 5 years.
Pump switch was to # 2 old pump when we arrived about 8:00 a.m., so we checked it for
capacity first.
Note: High wastewater level is set at 3" above the incoming pipe crown.
Pump # 2 on at 8:01:15 and 67" pump off 8:07:45 and 53" = 6.5 minutes and 14 minutes
of drawdown.
Volume pumped = 300 gal. + 9 gpm inflow to wet well.
Rate 455 gal + 6.5 min. = 70 gpm + 9 gpm into wet well = 79 gpm
Pump # 2 was retested. Results were about 70 gpm.
Conclusion: Pump # 2 is capable of less than Y, specified capacity.
Pump # 1 on - No flow out of pump station.
After review, we shut the gate valve on the pump # 2 discharge line and found that the
pump had been pumping back to the wet well through the faulty check valve. Test after
valve closed:
Pump # 2 on at 67 Y:." and 10:00:00
Pump # 2 off at 52" and 10:03:15
Volume pumped = 522 gallons times = 3.25 minutes
Rate = 165 gpm + 9 gpm = 170 com, good.
DIVERSIFIED TECHNOLOGY CONSULTANTS
556 WASHINGTON AVENUE NORTH HAVEN CT 06473 203 2394200 203234 7376 FAX
STAMFORD, CT ANDOVER, MA
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Conclusions:
E..'IIl[EftEII
WArER
L....lI
STItUCflRU
.OlUTlO..
FIELD REPORT
Page 2 of 4
1)
2)
3)
4)
Check valve for pump # 2 must be replaced or repaired.
Pump # 1 is adequate, it meets spec.
Pump # 2 is not adequate. It should be replaced.
The pump cycle time was changed from 8 minutes to 1 hour. A lot of electrical cost
will be eliminated by the fix. The pump was pumping up the force-main and
draining back through the check valve. The top of the check valve should be
removed and internal parts inspected. A bolt may have loosened.
The wet well must be cleaned.
5)
6)
7)
The valve pit should be cleaned.
An exterior indicator should be installed on the main control panel, so operator
knows that power is on the control panel.
8) Install 4" pvc stilling well for transducer.
2. Community Leaching System
Distribution into tanks is good.
Distribution out of the tank system is bad. The east pipe is blocked entirely. (Therefore,
the west side of the leaching field is overloaded). It must be unclogged. If the pipe is
broken, it must be fixed.
The results of the poor distribution are overloading the west system.
The sludge depths are as follows:"
West Tank in 18 Y:. inches
West Tank out 9 Y:. inches
Center Tank in
Center Tank out
29 inches
7 inches
East Tank in
East Tank out
22 Y:. inches
9 inches
The center tank inlet compartment is fuller than expected, but not critical at this time.
DIVERSIFIED TECHNOLOGY CONSULTANTS
556 WASHINGTON AVENUE NonH HAVEN CT 06"173 203239 "1200 2032347376 FA.x
STA.MFORD, CT ANDOVER, MA
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SOlUTIOIf'
LAND
EIlGlllU:RED
I1IlUCTUIlEa
WUEIt
FIELD REPORT
Page 3 of 4
Leaching field wastewater depths:
East 100 Footers (numbered from Whistler Ave.)
(Note: Flow is low to this
side - see previous
discussion).
Inlet # 1 Dry
Inlet # 2 1 inch
Inlet # 3 Dry
Inlet # 4 Dry
East 60 Footers
Inlet # 1 Dry
Inlet # 2 1 inch
Inlet # 3 4 inches
West 60 Footers
Inlet # 1 4 inches
Inlet # 2 18 inches
Inlet # 3 1 inch
West 100 Footers (Note: Overload due to poor distribution).
Inlet # 1 2 inches
Inlet # 2 36 inches
Inlet # 3 40 inches
Inlet # 4 30 inches
Conclusion: Distribution system must be unclogged at the Bilco hatch.
Disrepair manhole frames/covers:
West end of # 1 west 100 footer, cover in hole.
West end of # 2 west 100 footer, cover/frame off set.
# 3 East 60 footer - west end open manhole, no frame/cover.
# 4 East 100 footer, west end broken frame.
# 3 East 100 footer, west end frame/cover offset.
# 3 East 100 footer, east end frame/cover offset.
Note: Open manholes exist - worst ones should be covered with some material to prevent
accidents. Pressure treated wood or other means. School nearby.
DIVERSIFIED TECHNOLOGY CONSULTANTS
556 WASHINGTON AVENUE NORTH HAVEN CT 06473 2032394200 2032347376 FAX
STAMfORD, CT ANDOVER, MA
SOLUTION'
LAHD
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EN81llEERED
STRUCTURE'
WATEIt
FIELD REPORT
Page 4 of 4
3. Cinema
1" sludge inlet and outlet.
4. Silver Eel Cove Houses
Inlet compartment 18" sludge
Outlet compartment 12" sludge
5. Service Road Sewer
Manhole in Service Road opposite State Trooper Building was filled with debris, cloth
and muck. This is not a storm sewer. Someone upstream or kids are abusing the
sewer. If we had not discovered this, the sewer would have flooded upstream facilities.
The inlet sewer was backed up.
Recommendation: Clean material out of the manhole and inform sewer users that no diapers
or similar materials should be flushed down the toilet. Absolutely, no cloth material should be
flushed down the toilets.
Bob was with the writer most of the day. He has good knowledge of the maintenance and
repair requirements. These items must be fixed and the 4-5 catch basins near the pump
station disconnected before considering connection of a community center.
S:\06187 Fishes IslandIField Report\1Q-13-06.doc
DIVERSIFIED TECHNOLOGY CONSULTANTS
SS6 WAStHNGTON AVENUE NORTH HAVEN CT 06473 2032394200 203 2347376 FAX
STAMFORD, CT ANDOVER, MA
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1. 12. 2006
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.~' / 1. 12. 2006
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