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SYSTEM DEVELOPMENT CHARGE METHODOLOGY <br /> <br />TABLE 3 <br />Summary of Facility Process Component Allocation to System Capacity Parameters <br /> <br /> System Capacity Parameter <br /> <br /> Average Peak <br /> Facility Process Component Flow Flow BOD TSS Indirect Total <br /> <br />Collection system pipeline ¼ % ...... 1 <br />Collection system pump stations ¼ % ...... 1 <br />Preliminary treatment ¼ % ...... 1 <br />Primary treatment ¼ -- ¼ '~ -- 1 <br />Secondary treatment ¼ -- Y2 1/. __ 1 <br />Disinfection/ouffall ¼ % ...... 1 <br />Biosolids (same for all three subcomponents) .... Y2 ~ -- 1 <br />Tertiary filters ¼ -- ¼ Y2 -- 1 <br />Reuse facilities 1 ........ 1 <br />Odor control .... ~ ¼ -- 1 <br />Peak flow management -- 1 ...... 1 <br />Support facilities (Indirects) ........ 1 1 <br /> <br />Step Two - Growth Capacity Requirements <br />In developing SDCs, costs related to growth (see 'Cost Basis' below) are spread over <br />growth's total capacity requirements over the study period to determine the overall cost per <br />unit of growth by capacity measure. The study period is defined as a 20-year period, <br />consistent with facility planning requirements. The Department of Environmental Quality <br />(DEQ) stipulates that entities that own and operate wastewater facilities assume a 20-year <br />planning horizon when developing facility plans (see DEQ Guidance for Development of <br />Wastewater Facilities Plans, 2000). <br /> <br />To determine the capacity required by growth, the capacity required by existing users is <br />subtracted from the capacity projected in the facility plan to be required at the end of the <br />planning period. For peak flow estimates, existing users' current capacity requirements are <br />adjusted for anticipated I/I reductions (see Guidelines for the Preparation of Facilities Plans <br />and Environmental Reports for Community Wastewater Projects, 1999). <br /> <br /> Methodology Element Two: Develop Cost Basis <br />The cost basis represents the total costs that the SDCs are intended to recover. The following <br />methodological issues were addressed in developing the reimbursement and improvement <br />fee cost bases: <br /> <br />· System Valuation (Reimbursement Fee)-The method for valuing existing facilities <br /> with capacity to serve growth. <br /> <br />· Existing System Allocation (Reimbursement Fee) -The method for allocating existing <br /> system facility value to growth. <br /> <br /> S EA31003271388(DG). DOC/041040034 <br /> <br /> <br />