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<br />6 | Final Report Bay Area Clean Water Agencies | City of San Leandro <br />3 Basis of Analysis <br />The following subsections present the flow and loading conditions which were used as the basis for <br />the optimization, sidestream treatment, and plant upgrades analyses, respectively. As described in <br />the Scoping and Evaluation Plan3, plant optimization strategies are based on each plant’s <br />documented plans for future growth through 2025, and where that information is unavailable, a 15 <br />percent increase in loading was assumed as an allowance for growth for the 10 year horizon, with no <br />increase in flows. Sidestream treatment and upgrades were developed based on permitted capacity. <br />3.1 Flow and Loading for Optimization Analysis <br />The flow and loading for optimizing the plant operation for nutrient removal is presented in Table 3–1 <br />based on a nominal 15 percent increase in flow and loading by 2025. Any recommended <br />modifications may impact the plant’s future treatment capacity. Thus, any changes for optimization <br />are considered an interim solution. <br />Table 3–1. Raw Influent Flow and Load for Optimization (Projected to Year 2025) <br />Criteria Unit ADWF1,2 Annual <br />Average <br />Dry Season MM <br />(May 1 – Sept 30) 1,3 <br />Year Round MM1,3 <br />Flow mgd 4.8 5.0 5.3 6.4 <br />BOD lb/d 25,500 24,500 28,800 29,400 <br />TSS lb/d 22,100 22,100 26,200 28,300 <br />Ammonia lb N/d 1,300 1,400 1,300 1,500 <br />TKN lb N/d 2,400 2,600 2,400 2,900 <br />TP lb P/d 320 360 320 390 <br />Alkalinity4 lb/d as CaCO3 No Data No Data No Data No Data <br />BOD mg/L 631 583 656 555 <br />TSS mg/L 547 526 597 534 <br />Ammonia mg N/L 32 33 30 28 <br />TKN mg N/L 59 62 55 55 <br />TP mg P/L 7.9 8.6 7.3 7.4 <br />Alkalinity4 mg/L as CaCO3 No Data No Data No Data No Data <br />1. ADWF = Average Dry Weather Flow and MM = Maximum Month. <br />2. ADWF is calculated as the average flow for the months of July, August, and September. <br />3. The dry season maximum month values are used to size facilities to treat dry season loads that operate year round; the year round maximum <br />month values are used to treat year round loads that operate year round. <br />4. Alkalinity data not available. <br />3.2 Flow and Loading for Sidestream Treatment <br />Based on the data provided by SLWPCP, it was determined that the SLWPCP may be a candidate <br />for sidestream treatment. <br /> <br />3 BACWA (2015). Potential Nutrient Reduction by Treatment Optimization and Treatment Upgrades, <br />Scoping and Evaluation Plan. Submitted to the San Francisco Regional Water Quality Control Board, <br />Oakland, CA.