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City of Santa Ana, CA I SEWER RATE STUDY <br />The wastewater collected by the Sewer Enterprise consists of two elements: (1) sanitary flow and (2) <br />infiltration /inflow (1 /1) of storm runoff. Sanitary flow is that portion of the annual water use of each <br />customer class estimated to enter the sanitary sewer system. <br />Based on discussions with staff, it is estimated that the amount of flow entering the collection system <br />through 1/1 is approximately 5 percent of the total treated wastewater volume. Since 1/1 is not <br />attributable to a specific customer class, each class will bear its proportionate share of the costs <br />associated with 1/1 in an equitable manner. For the purposes of this Study, 1/1 flow is assigned 70 percent <br />to volume and 30 percent to connections (equivalent meters) <br />Cost of Service Allocations <br />Costs of service are allocated to the customer classes by application of unit costs of service to respective <br />service requirements. Unit costs of service are based upon the total costs previously allocated to <br />functional components and the total number of applicable units of service. Dividing the costs allocated <br />to functional cost components by the respective total units of service requirements develops unit costs <br />of operation and maintenance expense, and net capital costs. <br />Unit Costs of Service <br />Table 20 presents total Test Year O &M expense and net capital costs allocated to functional cost <br />component as taken from Tables 17 and 18. <br />Table 20: Unit Costs of Services with Costs in Thousands of Dollars <br />Net Operating <br />Expense <br />1 (Table 16, Line 10) <br />Capital Costs <br />2 (Table 17, Line 8) <br />Total Cost of <br />3 Service <br />Units of Service <br />In 000's (Table <br />4 18, Line 9) <br />5 Cost per Unit <br />3,172.2 <br />2,148.5 <br />0.0 <br />0.0 <br />0.0 <br />2,559.4 <br />2,557.2 <br />0.4 <br />0.4 <br />1.4 <br />$5,731.6 $4,705.7 $0.4 $0.4 <br />BLACK & VEATCH I Sewer Rate Study <br />15,269.3 26,747.9 30,348.4 <br />$1.4 <br />658.8 364.9 <br />0.0 0.0 <br />$658.8 $364.9 <br />261.5 13.2 261.4 <br />$0.31 $0.01495 $0.01318 $0.01 $49.91 $1.40 <br />per per <br />per HCF 1,000 Ibs 1,000 Ibs per bill per bill per bill <br />65B -204 <br />