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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 liquids 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 liquids unit process based on reliability and redundancy <br /> requirements. <br /> <br /> TABLE 5.4.2-2 <br /> Liquids Unit Process, Existing and 2025 Design Capacity <br /> MWMC Facilities Plan, Eugene-Springfield <br /> <br /> Existing Total 2025 Capacity <br /> Design Capacity Need <br /> Unit Process Basis (mgd) (mgd) 2025 Condition of Need <br /> <br />Influent 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 Removal 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 with <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 />Clarification largest out of service <br /> <br /> AWWF 75 111 <br /> <br /> MWMC_5.0_REVB_VKS.DOC 5-27 <br /> <br /> <br />