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7.A. - Page 93 <br /> Wastewater Unit Cost Derivation <br /> The following tables calculate unit rates for flow, BOD and SS. Sewer rate revenue requirements for <br /> 2018/19 are multiplied by the cost allocations percentages derived for wastewater flow and <br /> strength to determine total costs for recovery from flow, BOD and SS. The costs allocated to each <br /> parameter is then divided by the loadings assigned to each parameter to determine a unit cost for <br /> each parameter. <br /> Table S11: Unit Rate Calculations <br /> Flow BOD SS <br /> TARGET SEWER SERVICE CHARGES 2018/19 <br /> Target City Sewer Rate Revenues 31,606,000 <br /> SEWER RATE RECOVERY <br /> Cost Allocation% 59.60% 19.33% 21.07% <br /> Cost Allocation$ $18,837,559 $6,109,364 $6,659,077 <br /> Total Loadings 2,806,191 4,184,997 4,059,031 <br /> hcf lbs lbs <br /> Unit Rate $6.713 $1.460 $1.641 <br /> per hcf per lb per lb <br /> 3.10.2 Residential vs. Non-Residential Cost Recovery <br /> These underlying unit costs are then applied to the overall wastewater loadings from residential vs. <br /> non-residential accounts to determine the level of cost recovery from each general class. Based on <br /> the calculations, approximately 83% of the 2018/19 revenue requirement is assigned to residential <br /> customers and 17% assigned to non-residential accounts. <br /> Table S12: Residential vs. Non-Residential Rate Recovery <br /> Wastewater Wastewater Unit Costs 2018/19 <br /> Flow Strength (mg/I) Flow BOD SS Cost <br /> hcf mg BOD SS $6.713 $1.460 $1.641 Recovery <br /> RESIDENTIAL 2,260,800 1,691.2 250 250 $15,176,425 $5,147,539 $5,784,828 $26,108,792 <br /> %of Total 81% 84% 87% 83% <br /> NON-RESIDENTIAL 545,391 408.0 194 157 $3,661,134 $961,825 $874,248 $5,497,208 <br /> %of Total 19% 16% 13% 17% <br /> TOTAL 2,806,191 2,099.2 $18,837,559 $6,109,364 $6,659,077 $31,606,000 <br /> B Sewer Utility Finances& Rates 66 <br /> Water&Sewer Financial Plans&Rate Studies <br />