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3. Biosolids Handling Facilities <br />Construction of new biosolids management facilities at the City of Washougal wastewater treatment plant <br />(WWTP) which will consist of a new biological selector, aerobic digester, <br />biosolids handling building, and addition of odor control in the existing headworks building. <br />The City is working on multiple upgrades to the WWTP to reduce potential environmental impacts of the sludge <br />lagoons to the adjacent Steigerwald National Wildlife Refuge, reduce <br />odors, and improve effluent quality discharged to the Columbia River. The new solids handling building setup <br />will include a rotary drum thickener, screw press dewatering, <br />polymer activation and dosing, aeration blowers, electrical room for control panels and Motor Control Centers <br />(MCCs), and conveyor system to biosolids storage. Other processes <br />in the plant will include odor control in the headwork and solids handling processes, biological selector, decom- <br />missioning of the existing lagoon storage system, addition of aerobic solids digestion, WAS pump replacement, <br />and upgrade of the existing utility water system. Two (2) new solids handling structures are proposed for the <br />project: an aerobic digester and a solids handling building. The new structures are to be constructed in the loca- <br />tion of <br />Lagoon 1, which will be fully decommissioned and filled. One (1) new treatment structure will be constructed <br />between the headworks and the oxidation ditches: the biological selector. <br />• MGD: 26.0 <br />3 <br />X <br />X <br />X <br />X