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<br /> <br />Bay Area Clean Water Agencies | City of San Leandro Final Report | 3 <br />1 Introduction <br />The City of San Leandro Water Pollution Control Plant (SLWPCP) discharges to discharges to <br />Lower San Francisco Bay. It is located at 3000 Davis Street San Leandro, CA 94577, and it serves <br />about 15,300 service connections throughout northern two-thirds of the City of San Leandro. The <br />plant has average dry weather flow (ADWF) permitted capacity of 7.6 million gallons per day (mgd). <br />2 Current Conditions <br />The following subsections provide information on current conditions, including existing permit <br />requirements and process, flows and loads, and on-going efforts related to nutrient load reduction. <br />2.1 Existing NPDES Permit <br />SLWPCP holds the National Pollutant Discharge Elimination System (NPDES) permit Order No. R2- <br />2012-0004; CA0037869. SLWPCP shares the permit with other dischargers of the East Bay <br />Dischargers Authority (EBDA). Table 2–1 provides a summary of the permit limitations for the San <br />Leandro WPCP. Table 2–1 is not intended to provide a complete list of constituent limitations in the <br />NPDES permit. <br />Table 2–1. NPDES Permit Limitations (Order No. R2-2012-0004; CA0037869) <br />Criteria1 Unit Average Dry <br />Weather <br />Average <br />Monthly <br />Average <br />Weekly <br />Maximum <br />Daily <br />Flow mgd 7.6 -- -- -- <br />BOD mg/L -- 25 40 -- <br />TSS mg/L -- 30 45 -- <br />Total Ammonia, as N mg/L -- 93 -- 130 <br />This table identifies relevant permit limitations only and does not include a complete list of permit limitations. <br />2.2 Process Flow Diagram <br />Figure 2-1 shows the process flow diagram for the SLWPCP. Both liquids processes and solids <br />processes are shown. Treatment consists of a headworks, primary sedimentation, trickling filter, <br />activated sludge, secondary clarification, and disinfection by sodium hypochlorite. Treated <br />wastewater from the wastewater treatment facility is transported to EBDA’s system for final <br />dechlorination and discharge to the EBDA Common Outfall. The activated sludge process maintains <br />a low SRT for secondary treatment. No major nutrient removal systems are currently in place. <br />Sludge is anaerobically digested, dewatered using a belt filter press and further dried in open drying <br />beds. <br />