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6. DEVELOPMENT AND EVALUATION OF ALTERNATIVES <br /> <br /> ~ 30 mgd through Tertiary <br /> Filtration <br /> <br /> 300 mgd through ~ 160 mgd through <br /> Primary Clarification Secondary Treatment <br /> <br /> ~140 mgd through "Blending" <br /> Diversion <br /> <br />FIGURE 6,6.2-1 <br />Process Flow Schematic for System Alternative 3--Additional Primary Cladfiers <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br />System Alternative 4 - High-Rate Clarification <br />A new high-rate clarification (HRC) trait process would be constructed and used in <br />conjunction with the existing primary clarifiers to treat the entire 277 mgd PWWF A ptunp <br />station would divert pretreated effluent in excess of 160 mgd from preliminary treatment to <br />the new HRC facility. Primary effluent from the HRC facility would be diverted around the <br />secondary treatment system via gravity. The HRC primary and secondary effluents would <br />be disinfected separately and blended prior to discharge into the river. Figure 6.6.2-2 shows <br />the process flow schematic for system alternative 4. <br /> <br /> ~ 30 mgd through Tertiary <br /> Filtration <br /> <br /> ~ 160 mgd through <br /> Primary / Secondary <br /> <br /> ~ 140 mgd through High <br /> Rate Clarification <br /> <br />FIGURE 6.6.2-2 <br />Process Flow Schematic for System Alternative 4--HRC <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br />System Alternative 5 - Parallel Primary and Secondary Treatment <br />During peak flow events a dynamic flow management strategy would be used to optimize <br />the existing primary and secondary treatment capacities. Two new pump stations would be <br />used to divert preliminary treated wastewater directly to secondary treatment and divert PE <br />arottnd secondary treatment. Pretreated effluent would flow to the existing primary <br /> <br />MWMC_6.0_REV11 .DOC 6-53 <br /> <br /> <br />