Item 2: Resolution Amending MWMC Regional Wastewater SDC Methodology

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20-Year Project List Allocate to Process Components STEP I-1 STEP I-2 Allocate to System Capacity Parameters Avg. Flow Peak Flow BOD TSS Allocate to Project Type STEP I-3 Performance Rehabilitation Capacity STEP I-4 Allocate to User Type % of Total Future % of Capacity Load Expansion 0% Allocation Basis The allocation of future projects to facility process components is generally fairly straightforward, as most projects relate directly to an individual component or support the entire treatment system. The refinement of the facility component allocation process for MWMC relates to recognition of peak flow management costs. While it is likely that future project lists will include projects entirely related to peak flow management, it is also likely that portions of projects relating to various aspects of the treatment process (e.g., secondary treatment) will also play a role in future peak flow management. The following question needs to be answered when allocating project costs to facility components: “Which specific facility component does the project expand or improve?” If the project expands or improves more than one facility component, then project costs should be apportioned relative to the expansion or improvement of each applicable component. The allocation fractions from Table 3 are used to distribute costs by facility component to capacity parameter, as was done for the existing system cost allocations. The basis for these allocations is described in Appendix B. Step I-3 of the project cost allocation methodology is to allocate costs to project types. The three project types, which are intended to be representative of the complete project list, are: 1.—Projects or portions of projects that are related to increasing liquids and/or Capacity biosolids conveyance, treatment, and disposition capacity beyond existing design Page 14 OF 39