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Project Description
For this contract, Parsons demolished and removed/salvaged selected structural, mechanical, and electrical components of the existing pump station; renovated the existing pump station, which included replacing four vertical centrifugal sewage pumps, the pumping system piping and valves, and HVAC and electrical systems (including new variable frequency drives [VFDs] and motor control centers); and replaced various related utility systems. The project also entailed constructing a new wet well and station superstructure, including walls, roofing, and structural framing; constructing a temporary bypass pump station with four submersible pumps, two 12-ft-dia manhole sumps, new VFDs and equipment controls, piping, electrical facilities and temporary enclosure; and constructing a new generator building with a 1,000-kW diesel generator, a 2,000-gal above-grade fuel storage tank, operator wash facilities, and switchgear components. 
Major on-site pipeline work included diverting the existing influent gravity sewer lines to the new wet well and constructing new 20-in. forcemains, an 18-in. bypass line, a deep vault to contain the control valves, and the connection to the existing 20-in. forcemains. Parsons also constructed approximately 880 ft of 8-in. ductile iron water main extension to be owned by the City of Bellevue, including a 125-ft section that was bored and jacked under Bellevue Way.
In addition, Parsons constructed an outdoor odor control facility, including a 12-ft-dia fiberglass reinforced plastic (FRP) vessel with activated argon, an FRP foul air exhaust fan, 20-in. FRP ductwork, mist eliminator assembly, and exhaust stack.
All construction required multiple phases of testing, training, and startup of various stages of the work.
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