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2. Project Description <br /> <br />San Leandro Treatment Wetland <br />IS/MND <br />2-2 February 2024 <br /> <br />The WPCP was initially built in 1939, making it one of the oldest wastewater treatment facilities in the East <br />Bay, yet significant upgrades have been undertaken over the years. Treatment consists of headworks pumping, <br />grit and screenings removal, primary sedimentation, trickling filter, activated sludge, secondary clarification, <br />and disinfection by sodium hypochlorite. Treated wastewater from the wastewater treatment facility is <br />transported to EBDA's system for final dechlorination and discharge to the EBDA Common Outfall. No major <br />nitrogen removal systems are currently in place. Sludge is anaerobically digested, dewatered using a belt filter <br />press, and further dried in open drying beds (Figure 2.3, Process Flow Diagram). An annual total of 95 million <br />gallons of treated effluent is recycled and used for local golf course irrigation. <br /> <br />Figure 2.3. Process flow diagram for the San Leandro WPCP <br />Basin Conditions <br />The triangular-shaped basin designated for emergency wet weather retention of wastewater is situated at the <br />western terminus of the WPCP. It is bounded by a tidal slough connected to San Francisco Bay, to the south <br />and east, and by the Metropolitan Oakland International Airport (OAK) and the Lew Galbraith Golf Course to the <br />north. A dike surrounds the effluent pond, with the highest point of the crest reaching approximately 12 feet <br />NAVD88. The pond measures a maximum length of roughly 1,150 feet and a maximum width of about 350 <br />feet. To prevent erosion, the outer side of the southern dike is armored with concrete rubble and debris along <br />the tidal slough. The slopes on the outer side of the southern dike vary, ranging from slightly steeper than 1:1