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Table 3 provides the allocations of existing and future facility process components to the <br />system capacity parameters: average flow, peak flow, BOD, and TSS. A description of <br />process components is provided in Appendix A. The rationale for the allocation percentages <br />is provided in Appendix B. These allocations are used to determine the projected costs of <br />capacity to be used by new development that establish the reimbursement fee and <br />improvement fee cost bases. The underlying approach is to evaluate the following criteria <br />for each facility process component: <br />? <br />Functional performance <br /> <br />? <br />Design basis <br /> <br />The functional performance criterion considers the actual purpose of the facility on a daily <br />basis. Is the purpose of the facility to remove BOD or TSS from the wastewater? Or is the <br />purpose of the facility to simply pass the flow (average and/or peak) and remove some <br />other parameter not represented by BOD or TSS such as screenings, grit, or pathogens? <br />These questions are answered by the functional performance component. The design basis <br />considers what system capacity parameter or combination of parameters drives the sizing of <br />the facility and, therefore, the constructed cost. The allocation basis for each facility <br />component presented in Table 3 combines both the functional performance and design basis <br />considerations. In addition to these system parameters, because there can be projects that <br />provide overall support for the wastewater system, a separate category of “indirect” <br />support facilities is used to provide for reallocation of these support-type costs across all of <br />the system capacity parameters. <br />TABLE 3 <br />Summary of Facility Process Component Allocation to System Capacity Parameters <br /> System Capacity Parameter <br />Average Peak <br />Facility Process Component Flow Flow BOD TSS Indirect Total <br />Collection system pipeline ¼ ¾ -- -- -- 1 <br />Collection system pump stations ¼ ¾ -- -- -- 1 <br />Preliminary treatment ¼ ¾ -- -- -- 1 <br />Primary treatment ¼ -- ¼ ½ -- 1 <br />Secondary treatment ¼ -- ½ ¼ -- 1 <br />Disinfection/outfall ¼ ¾ -- -- -- 1 <br />Biosolids (same for all three subcomponents) -- -- ½ ½ -- 1 <br />Tertiary filters ¼ -- ¼ ½ -- 1 <br />Reuse facilities 1 -- -- -- -- 1 <br />Odor control -- -- ½ ½ -- 1 <br />Peak flow management -- 1 -- -- -- 1 <br />Support facilities (Indirects) -- -- -- -- 1 1 <br />Page 10 OF 39 <br /> <br /> <br /> <br />