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7.A. - Page 94 <br /> 3.10.3 Residential Rate Derivation <br /> Residential rates are derived by dividing the total amount of costs designated for residential rate <br /> recovery by the total number of residential billing units, with each billing unit representing the <br /> charge for a typical residential dwelling unit per account with 1 — 9 dwelling units. The following <br /> table calculates the total number of residential sewer billing units. Each dwelling unit in a <br /> residential account with 1—9 dwelling units is assigned 1.0 billing unit. <br /> Each dwelling unit in a multi-family account with 10 or more dwelling units discharges <br /> approximately 60% of the wastewater per standard residential connection based on evaluation of <br /> historical winter water use. This number of sewer billing units allocated to each of these dwelling <br /> units includes a) a standard fixed charge for all residential accounts that recovers 75% of costs <br /> regardless of wastewater flow, and b) a usage-based charge component that recovers 25% of costs. <br /> The usage-based component is multiplied by the 60% flow percentage applicable to each multi- <br /> family 10+ dwelling unit, resulting in an adjusted usage-based charge component equal to 15%. The <br /> number of billing units per dwelling unit in multi-family accounts with 10 or more dwelling units <br /> equals 90% (75% + 15%) of the standard residential charge, or 0.90 billing units. <br /> Table S13: Single & Multi-Family Residential Dwelling Unit Equivalents <br /> Dwelling Flow per Flow per <br /> Estimated Monthly Sewer Discharge per Dwelling Unit Units Unit(hcf) Unit(gpd) <br /> Residential up to 9 Dwelling Units 19,600 7.5 184.5 <br /> Multi-Family 10+Dwelling Units 9,200 4.5 110.7 <br /> Flow%of Standard Residential Discharge 60.0% <br /> Fixed&Variable Revenue Recovery for Residential Rates <br /> Fixed Revenue Recovery 75% <br /> Variable Revenue Recovery 25% <br /> Multi-Family 10+Revenue Recovery as%of Standard Residential Charge <br /> Fixed Revenue Recovery 75.0% <br /> Variable Revenue Recovery 25.0% <br /> x Multi-Family 10+Dwelling Units Flow% x 60.0% <br /> Net Variable Revenue Recovery 15.0% <br /> Total Revenue Recovery as%of Standard Dwelling Unit 90.0% <br /> Sewer Billing Units per Dwelling Unit 0.90 <br /> Residential Billing Units Dwelling Billing <br /> Units Units Total <br /> Single Family&Multi-Family up to 9 Dwelling Units 19,600 1.00 19,600 <br /> Multi-Family 10+Dwelling Units 9,200 0.90 8,280 <br /> 28,800 27,880 <br /> B Sewer Utility Finances& Rates 67 <br /> W Water&Sewer Financial Plans&Rate Studies <br />