HomeMy WebLinkAboutField Report 2001
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LAND
ENGINEERED
STRUCTURES
SOLUTIONS
WATER
FIELD REPORT
December 10, 2001
December 6, 2001
DATE
MEETING DATE
Fisher's Island
LOCATION
Norm of Harold's Construction, LLC
Bob Caumoyer (Part-time)
Michael A. Horne
ATTENDEES
Review of Wastewater Facilities for Maintenance
PURPOSE
Michael A. Home, M.S., P.E.
REPORT BY
Fisher's Island Operation and Maintenance
Annual Review of Wastewater Facilities
DTC Project # 01-244-100
PROJECT NAME I PROJECT NUMBER
1. Pump Station Check
A. Wastewater inflow 8" sewer = 2 gal. start 8:39:19 finish 8:45:09
2 gal - 5 minutes 50 seconds = 0.34 gpm It was noted this was the
lowest flow in 15 years. It was questioned by the writer.
B. Pump check: 246 gallons pumped in 1 minute 10 seconds.
Rate = 210 gpm specification is 180 gpm. Pump is good, even over
specification of 180 gpm capacity.
C. Wet-well: Little floatables, good condition.
D. Valve Pit: Check valves, backflow leakage computations.
8:48:08 = 41"
8:54:36 = 44" = 53 gallons back to wet-well
over 6 min. 24 sec. = 8.28 gpm.
Conclusion: The east check valve leaks at 8:28 gal./min. Much lower than
in the past.
The east check valve should be reconditioned during the winter low flow
period.
Mud on floor of the valve pit should be hosed out.
By-pass piping and valves are ok.
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Page 2
E. Spares: Pump, no compressor (was $186.00 when first mentioned two
years ago.)
F. Control and Electrical Power Panels: Panels were painted. Looked to be in
good condition.
II. Plugged Sewer Upstream of Pump Station
Sandbags connected to three lines (3) were found to be backing up sewage. (6 foot
surcharge). They were pulled and the 24" line emptied. Both pumps activated and
pumped well without vibration.
III. Community Leaching Field:
A. Distribution box is working about right. Only a slightly lower flow split to
east was noticed.
B. Septic Tanks (10,000 gallon) Depth of Sludge.
December 6, 2000 November 2000
In Out In Out
West 38" 21" 27" 18"
Center 33" 7" 25" Negligible
East 38" 46" 28" 47"
It can be concluded that the tanks are working. However, sludge is rising faster than
in the past. Pump out of sludge next spring should be considered.
All 14 concrete galleries were inspected by removing 28 manhole covers and
viewing. The inlets all revealed even distribution of flow. The outlets were all dry.
Three manhole rings must be replaced - one is very dangerous.
The one frame at the eastern end of the east #2 row should be corrected. A
temporary board cover should be installed so kids do not fall into it.
IV. Cinema System
6" sludge in inlet compartment. Negligible in outlet compartment.
V. Coast Guard Houses Septic Tank
Inlet: Surface is clogged with floating solids to the point where it was difficult to
measure the depth of sludge.
Depth of sludge = 12"
Outlet very little sludge.
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Page 3
VI. Sewer Clogged
The sanitary sewer was clogged at the intersection of the 6" line from the State
Police facility and the road behind the house fronting Whistler Avenue (see attached
sketch).
Several cloth tee shirts were removed from the upstream sewer. (They should be
removed from the manhole). The upstream pipe was surcharged and gushed out.
This manhole should be inspected occasionally to prevent backups because
basements flood. It is not clear how the large cloth objects got into the sewer.
Summary of Recommendations:
. Continue to observe check valves
. Continue pumping at least one 10,000 gallon tank sludge and clean the
Coast Guard houses septic tank inlet compartment.
. Remove mud from bottom of valve pit.
. Obtain spare compressor.
. Fix leach field manhole rings so covers will not fall in.
. Unclog and inspect the sanitary manhole in the back alley behind Whistler
Avenue where the State Police service enters to assure that it does not get
clogged again.
Attachment: Sketch
S:\01244\Field Reports\12-B-01.doc
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