Resolution No. 4875 - Laserfiche WebLink

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TABLE 3 Summary of Facility Process Component Allocation to System Capacity Parameters System Capacity Parameter Average Peak Facility Process Component Flow Flow BOD TSS Indirect Total Collection system ,pipeline ~ % 1 Collection, system pump stations % % 1 Preliminary treatment % % 1 Primary treatment % % % 1 Secondary tr~atment % % % 1 Disinfection/outfall % % 1 Biosolids (same for all three subcomponents) % % 1 Tertiary filters ~ % % 1 , Reuse facilities 1 1 Odor control % % 1 Peak flow management 1 1 Support facilities (lndirects) 1 1 Step Two · Growth Capacity Requirements In developing SDCs, costs related to growth (see 'Cost Basis' below) are spread over growth's total capacity requirements over the study period to determine the overall cost per unit of growth by capacity measure. The study period is defined as a 20-year period, consistent with facility planning requirements. The Department of Environmental Quality (DEQ) stipulates that entities that own and operate wastewater facilities assume a 20-year planning horizon when developing facility plans (see DEQ Guidance for Development of Wastewater Facilities Plans, 2000). To determine the capacity required by growth, the capacity required by existing users is subtracted from the capacity projeCted in the facility plan to be required at the end of the planning period. For peak flow estimates, existing users' current capacity requirements are adjusted for anticipated 1/1 reductions (see Guidelines for the Preparation of Facilities Plans and Environmental Reports for Community Wastewater Projects, i999). Methodology Element Two: Develop Cost Basis The cost basis represents the total costs that the SDCs are intended to recover. The following methodological issu~s were addressed in developing the reimbursement and improvement fee cost bases: . Existing System Valuation (Reimbursement Fee) - The method for valuing existing facilities with capacity to serve growth. . Existing System Allocation (Reimbursement Fee) - The method for allocating existing system facility value to growth.