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The total unit cost per square foot of impervious surface area is the sum of the per unit costs of additional capacity of the improvement fee and reimbursement fees. Table -1-2 9 provides a detailed breakdown of the calculation and numerical supporting data of the stormwater SDC. Figure 6 illustrates the calculation formula of the stormwater SDC. The stormwater SDC rates per unit of capacity can be found in Appendix F in the current adopted SDC fee schedule. 2.0 Single Family Dwelling and Duplex Rates The stormwater SDC for single family residential development is comprised of three rate categories: Small residential with a building footprint of 1,000 square feet or less; Medium residential with a building footprint of greater than 1,000 but less that 3,000 square feet; and Large residential with a building footprint of 3,000 square feet or more. Building footprint is defined as the first floor area plus attached or detached garage or carport. For the Small and Medium residential rate categories, an estimated average impervious surface area (square feet) specific to each category is multiplied by the current total stormwater SDC rate per square foot to determine the appropriate single-family residential stormwater SDC flat rate per dwelling unit. For the Large residential category, the stormwater SDC is determined by multiplying the actual impervious surface of the total proposed building site by the current total stormwater SDC unit cost per square foot. The stormwater SDC for a duplex is calculated as two times the appropriate stormwater SDC flat rate of either a Small or Medium residential category. Duplex units equal to or over 3,000 square feet each are treated as Large residential. Details of the stormwater SDC analysis are provided in Table -1-2 ~. Rate formulas, calculations, and fee schedule are provided in Appendix F. 3.0 Manufactured Home Park Rates Manufactured home developments are charged a flat rate per individual space based on the estimated average impervious area for a doublewide manufactured home, plus any additional common area impervious surface (e.g., clubhouse, private streets). To determine the amount of stormwater SDC attributable to the proposed spaces in the park, the total number of proposed spaces is first multiplied by the estimated average impervious surface area (square feet) per space, the results of which are then multiplied by the current total stormwater SDC unit cost per square foot. To determine the amount of stormwater SDC attributable to all additional common area impervious surfaces within the park, these areas will be measured separately and the sum of this additional actual impervious surface area (square feet) will be multiplied by the current total stormwater SDC rate per square foot. Details of the stormwater SDC analysis are provided in Table -1-2 ~. Rate formulas, calculations, and fee schedules are provided in Appendix F. 4.0 Multi-Family and Non-Residential Rate For all uses not listed in sections 2.0 and 3.0 above (e.g. multi-family, commercial, industrial) or whenever this Appendix D makes reference to a rate per square foot of impervious surface area, the stormwater SDC collected is determined to be the current stormwater SDC rate per square foot of impervious surface area as adopted in the SDC fee schedule located in Appendix F. 5.0 Stormwater Impacts Not Attributable to Impervious Surface Area For all uses not listed in sections 2.0, 3.0, and 4.0 above, where any development type creates an impact through discharges to the public stormwater system (as allowed by EC 6.610) which are not attributable to creation or modification of impervious surface area, will have stormwater City of Eugene SDC Methodologies Stormwat r,