The new, expanded wet well will capture SSO and allow it to be pumped eastward within the new forcemain.
Directional drilling minimizes disruption to residential areas along 14 Mile Road.
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After breaking ground in October, the Oakland County Drain Commissioner’s Walnut
Lake Pump Station Reconstruction project is underway. Built in the late 1960s, the
existing pump station has had numerous operational problems due to the age of the
facility. Considering the critical function of this facility, it has been determined
that it is beyond its useful life and should be replaced with a modern design. The
facility will be abandoned and a new pumping facility is being constructed within
the existing site limits. Construction is scheduled to be complete by October 2005.
Wade Trim reviewed alternative improvements to the existing pump station and designed
the selected alternative. The new pump station will reduce sanitary sewer overflows
(SSO) by transferring wet weather sanitary flow via a new interconnection from the
Farmington Interceptor to the Evergreen Interceptor. The interconnection will be
accomplished through a 22,000-foot directionally drilled, HDPR 20-inch forcemain
along 14 Mile Road from Inkster Road to Evergreen Road.
This flow transfer will virtually eliminate SSOs at the pump station and at the
Farmington Interceptor by using additional capacity provided by modifying the
operation of three combined sewer overflow (CSO) regulators. Modifications will
increase the flow to existing CSO basins and provide additional capacity in
the Evergreen Interceptor and the DWSD system during wet weather. Controlled
shut-off valves will be installed at the Acacia Park and Bloomfield Village CSO
facilities and the existing pumping operation controls at the Birmingham CSO facility
will be modified. This flow-swapping arrangement will provide for an additional 14
cfs capacity (up to the year 2013) within the Evergreen Interceptor for wet weather
sanitary flow that may otherwise result in discharge of SSOs.
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