o Backfill around sewage grinder pump after Ledyard WPCA inspects the installation.
o Excavate all sewer and electric pipe trenches.
o Lay all sewer pipes.
o Install all the necessary plumbing.
o Install redundant check valve and motor breather tube.
o Grade, seed, pave, as necessary.
o Erect barriers to prevent sewage grinder pump from being hit by vehicles.
No comments.
Mr. Jones said that the following will need modifications.
Have available (or upgrade to make available) an adequate power supply.
o One 20-amp 240-volt circuit.
o One 15-amp 120-volt circuit.
Mr. Jones said that this doesn't match the grinder pump information that GU sent. He said he
would like to change it to:
"Have available (or upgrade to make available) an adequate power supply, (dedicated 240-volt
and 120-volt as required by the selected pump and alarm panel)."
Mr. Jones said the Commissioners need to check with Steve Banks, WPCA Supervisor and
Steve Masalin, Public Works Director, to make sure the permitting wording is correct.
The last section needing attention is the Residential dual check device addendum. Mr. Jones said
that if this is only contained in the procedure manual it will not be known to the rest of the
Town. He added that you can't legislate from the procedure manual.
"Effective the date of approval by the Town of Ledyard WPCA Commission of this
Cross-Connection and Backflow Prevention Program for Ledyard WPCA, all new residential
buildings will be required to install a residential dual check device immediately downstream of
the water meter.
a) Installation of this residential dual check device on a retrofit basis on existing service lines
will be instituted at a time and at a potential cost to the homeowner as deemed necessary by the
Department.
b) The owner must be aware that installation of a residential dual check valve results in a
potential closed plumbing system within his residence. As such, provisions may have to be
made by the owner to provide for thermal expansion within his closed loop system, i.e. the
installation of thermal expansion devices and/or pressure relief valves."
Mr. Jones said there is also another whole paragraph on Strainers:
"Strainers. The Department strongly recommends that all new retrofit installations of reduced
pressure principle devices and double check valve backflow preventers include the installation of
strainers located immediately upstream of the backflow device. The installation of strainer will
preclude the fouling of backflow devices due to both foreseen and unforeseen circumstances
occurring to the water supply system such as water main repairs, water main breaks, fires,
periodic cleaning and flushing of mains, etc. The occurrences may “stir up” debris within the
water main that will cause fouling of backflow devices installed without the benefit of strainers."