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5 BASIS OF PLANNING <br /> <br />5,4.2 Liquids Treatment Facilities Design <br />The 2025 design criteria for flow at the WPCF are summarized in Table 5.4.2-1. These flows . <br />provide the basis for future hquids unit process design. <br /> <br />TABLE 5.4.2-1 <br />Summary of Total Flow Projections For 2025 (Residential, Commercial, and Industrial) <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> Year 2025 <br />Estimated Population 297,585 <br />Wastewater Flow Projections (mgd) <br />Max. Month Dry Weather 59.3 <br />Max. Month Wet Weather 110.8 <br />Peak Day Wet Weather 227 <br />Peak Hour Wet Weather 277 <br /> <br />Table 5.4.2-2 summarizes the anticipated 2025 facility needs, design basis, and condition <br />requirements for each 1/quids unit process based on reliability and redundancy <br />requirements. <br /> <br />TABLE 5.4.2-2 <br />L~quids Unit Process, Existing and 2025 Design Capacity <br />MW/ftC Factlities Plan, Eugene-Springfield <br /> <br /> Existing Total 2025 Capacity <br /> Design Capacity Need <br /> Unit Process Basis (mgd) (mgd) 2{:)25 Condition of Need <br /> <br />Infiuent Pumping PWWF 215 277 Firm capacity without largest unit out <br /> of service <br /> <br />Influent Screening PWWF 175 277 Firm Capacity with one unit out of <br /> service <br />Grit Remova~ PWWF 175 277 Firm Capacity with one unit out of <br /> service <br />Preaeration AWWF 58.4 No Additional None <br /> Capacity Need <br /> <br />Primary Clarification PWWF 86 277 or 160 with 50% of design flow capacity w~th <br /> flow management largest out of service <br /> <br />Aeration Basins ADWF 49 59 Total Capacity <br /> AWWF 75 111 Total Capacity <br /> <br />Secondary ADWF 49 59 75% of design flow capacity with <br />Clanfication largest out of service <br /> <br /> AWWF 75 111 <br /> <br /> MWMC_5.0_REVS._VKS,DOC 5-27 <br /> <br /> <br />