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7.A. - Page 90 <br /> 3.10.1 Unit Rate Derivation for Cost Recovery <br /> Cost Recovery Allocation <br /> Table S9 shows a 3-year projection of annual sewer expenses broken out by functional cost <br /> category, and allocates the 3-year average for each cost category for recovery from the rate <br /> parameters of wastewater flow and strength, as measured by BOD (biochemical oxygen demand), <br /> and SS (suspended solids). <br /> • Costs for the City's sewer collection system are allocated 80% to flow and 20% to <br /> wastewater strength in recognition that most of the costs of operating and maintaining the <br /> collection system are attributed to flow, but a small portion of costs are attributable to the <br /> strength concentrations of wastewater discharge. <br /> • SVCW operating costs are allocated based on SVCW's adopted budget allocations. These <br /> allocations recover SVCW operating costs based on each member agency's share of total <br /> SVCW influent flow and loadings. However, it is also important to note that most of SVCW's <br /> operating costs are fixed costs that do not vary with changes in wastewater flow. <br /> • SVCW debt service, reserve and capital cost contributions are allocated 60% to flow, and <br /> 20% each to the wastewater strength parameters of BOD and SS. These allocations are <br /> based on the estimated share of SVCW's roughly $790 million capital improvement program <br /> attributable to wastewater flow and strength assuming costs for SVCW's conveyance system <br /> are primarily related to flow, costs for nutrient removal are primarily related to wastewater <br /> strength, and costs for other wastewater treatment plant improvements are attributable 1/3 <br /> to flow, 1/3 to BOD, and 1/3 to SS. <br /> • As shown at the bottom of the table, total costs are allocated for rate recovery as follows: <br /> Flow: 59.60%, BOD 19.33%, and SS 21.07%. <br /> B Sewer Utility Finances& Rates 63 <br /> "r Water&Sewer Financial Plans&Rate Studies <br />