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MWMC FACILITIES PLAN FIGURE ES-2 Peak FI0w Capacity Deficit /vlWMC Facilities Plan, Eugene-Springfield Current Capacity Additional Capacity Total Capacity Required Facility (mgd) Through 2025 (mgd) in 2025 {mgd) A B C=A+B Influent Pumping 175 102 277 Pretreatmen! 175 102 277 Pdmary Treatment 90-110 50-70 160 Secondary Treatment 100-110 50-60 160 Disinfection 175 102 277 Outfall 175 102 277 Alternatives Evaluation As shown in Figure ES-2, the treatment plant faces a significant peak flow capacity deficit. The WPCF currently has no additional peak flow capacity, and an additional 102 mgd of peak flow capacity is needed by 2025. The Facilities Plan analysis also concludes that in order to meet NPDES permit requirements for ammonia, thermal load and total mass removal, significant improvements to the treatment plant's unit processes are needed. To solve these projected capacity shortfalls, all available options known to staff and the consultants for resolving the regional treatment facilities capacity and performance constraints were identified. The regulatory requirements and other planning criteria discussed above were translated into a series of evaluation criteria. An evaluation matrix of treatment facility needs and potential solutions was developed and the criteria were applied, which resulted in a set of "preferred" and "acceptable" solutions. The solutions were further evaluated based on compatibility with existing treatment plant processes and on estimated costs, which resulted in the elimination of all but four systemwide alternative solutions. (DEQ requires that a "no action" option be presented, so a total of five options are summarized in the table below.) The final evaluation resulted in the alternatives summarized in Table ES-l, which are the least costly to implement in addition to meeting the stated planning requirements (with the exception of Alternative 1). ES-4 MWMC_ EXECSUM_ REV4_2_. DOC