HomeMy WebLinkAboutEngineer Certification BSC GROUP �5 _ �r - •
APR 1 1 2005 657 Main Street,
Yarmouth Board Of Health April 8, 2005 Unit 6,
1164, Route 28 HEALTH BEN Route 28
South Yarmouth, MA 02664 West Yarmouth, MA
02673
Re: 228 Route 28, Septic System Replacement - Cape Cod Super Buffet Tel: 508-778-8919
Fax: 508-778-8966
Members of the Board:
This letter is to document BSC's observations of the construction of the septic system at
the above listed site. BSC staff has performed site reviews on a regular basis during
installation of the septic system. The reviews included testing of the septic tank and pump
chamber for leakage, observation of the construction of the soil adsorption system and
observation of the operation of pumps/controls and as-built surveys. The following is a
summary of the reviews.
March 2, 2005: Interior plumbing was found to be at a different elevation (lower) than
expected . Orangeburg piping was replaced with new building sewer to the septic tank.
As a result of the lower elevation of the building sewer, the septic tank and pump
chamber will be set slightly lower than designed. Plumber also found some sinks going
directly to the septic tank. According to Bill McMahon, project manager for Robert B.
Our Co, the internal piping was redirected to the grease trap.
March 2, 2005: The excavation for the pump chamber was reviewed. The hole was free
of standing water (two dewatering pumps working continuously) and the stone bed was
installed. Seals for the tank joints were installed during the installation of the tank.
March 3-5, 2005: The septic tank(a sectional tunnel tank) was installed on a stone bed.
Dewatering pumps were in operation and no evidence of water was visible in the
excavation.
March 5, 2005: The pump chamber was filled with water(from the dewatering pumps)to
8" from the top and covers closed for the weekend.
March 7, 2005: The pump chamber covers were removed after 48 hours and the water
remained at 8" indicating no leakage. The piping from the building to the tanks were ncltngineers
connected and as such the tank could not have received any inflow during the test.
Environmental
March 7, 2005: The grease trap was installed. A new 6" C.I. piping was installed from tieentists
building to the grease tank. GIS Consultants
March 9, 2005: The septic tank was filled with water(from the dewatering pumps) and Landscape
left overnight. Architects
Planners
Surveyors
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March 10, 2005: The water level in the septic tank was found to be down 2 feet indicating
significant leakage. All water was pumped out and joint seals were repaired. r"
March 10—11, 2005: The soil removal around and under the soil adsorption system and
associated sand fill soil replacement were reviewed by BSC.
March 14, 2005: Even though the restaurant was closed, water was found flowing into the
grease trap that was concluded to be coming from a food cooler. (Two other coolers were
not in use). Because the septic system is not designed to accept this additional flow and
because this is clean cooling water (not wastewater) BSC recommended re-plumbing of
the piping from the coolers and installation of a separate recharge chamber for the cooler
water rather than discharge it to the ground as is typical of this equipment. (As of April 8,
2004 connection of the cooling water discharge pipe to the recharge pit remains to be
completed).
March 14-15, 2005: The septic tank was re-filled with water and no difference in water
level was observed 24 hours later indicating no leakage.
March 15-16, 2005: Stone bedding and piping of soil adsorption system visually
reviewed.
March 17, 2005: Pumps/alarms/pressure dose system reviewed during an operational
test. All end holes in the laterals producing the same discharge height of approximately
20 inches. Pumps and controls appeared to operate as intended.
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March 18, 2005: The area over the leaching fields were backfilled and metal covers were
set to protect and provide access to the cleanouts at the end of the lines. Grade was
brought up to within 3"to 4" of the top of metal covers. Final gravel /bituminous
pavement to be installed at a later date.
Based on observation of the contractors control stakeout,the system is substantially in the
location shown on the design plan, there are manholes to grade at all significant manholes
and clean outs and at the direction of the Board of Health Agent, no as-built survey was
completed.
Based on these reviews, BSC is of the opinion that the system has been installed in
substantial compliance with the approved plans.
e BSC Group Inc,
avid J. Crispin PE,
Sr. Associate
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