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6. DEVELOPMENT AND EVALUATION OF ALTERNATIVES <br /> <br />alternative 5 at risk for DEQ approval. For this reason it is recommended that MWMC <br />consider system alternative 4 - High-Rate Clarification as a contingency plan if regulatory <br />approval is not granted for system alternative 5. HRC is the next-best alternative because of <br />its cost, operational flexibility, and ability to treat all PWWF through primary treatment. <br /> <br /> Cost and Weekly TSS Loading <br /> <br /> $35 <br /> <br /> $3o 28oo0 <br /> $25 -- <br /> <br /> $1s <br /> <br /> $0 -- -- 16000 <br /> Conventional Approach - Additional Primaries High Rate ClarilicaOon Parallel Primary and Secondary <br /> <br /> Treatment Options <br /> B_Weekly TSS Losd!r~g- (lb/day) <br /> FIGURE 6,6.4-1 <br />Cost and Weekly TSS Loading <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br />MWMC_6,0_REV11.DOC 6-57 <br /> <br /> <br />