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Information on the Washington Public
Works Department Project
One source of pollution compromising the health of the Mill
Pond is the sediment and silt build-up caused by the existing
road drainage system on Purling Beck Road discharging directly
into the pond. This drainage system picks up automobile pollutants
and animal waste along with road sediment and releases it
directly into the pond. There is a large sediment build-up
visible in the pond across from the public beach.
Sediment accumulation in Mill Pond by closed drainage
outlet
Photo taken by Erin Darrow on October 16, 2007
(Post-drawdown of Mill Pond Dam)
The plan is to direct the existing drainage system underneath
Bear Hill Road into an appropriate treatment system.The easterly
two catch basins on Purling Beck Road would be replaced and
connected to a treatment system on the Town's land adjacent
to Beards Brook, below the dam.The treatment sysytem would
consist of a bioretention settling pond. The current outlet
at the pond will be removed when the new system is in place.
Aerial and tax map overlay of Mill Pond area
Ed Thayer of the Washington Public Works Department is working
with Erin Darrow of Darrow Civil Engineering to do the design
and engineering. The final design will depend on factors determined
in the engineering analysis and design process. Her emphasis
will be to develop a treatment structure that is effective,
durable, and cost-efficient. Natural habitat will be considered;
native plantings will also help contribute to storm water
treatment.
Preliminary proposal map for Mill Pond drainage outlet
The Public Works Department will be doing the settling pond
construction and redirecting of the existing drainage system
during the summer as well as removal of the existing drain
and sediment build up.
Check back here for more information and the final design as it becomes available.
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