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7 RECOMMENDED PLAN <br /> <br />FIGURE 7.2.3-1 <br />Recommended Primary' Clarifier Enhancements <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> / Skimmer Arms Dissipating ~m aaffie .. <br /> <br /> E~isfin~ <br /> ~ ..... Intuit Exi~ng Sludge <br /> ~'~ ........... ~ [~" Column Removal <br /> / <br /> ~ma~ Sludge .... <br /> Hoper <br /> <br />7,2.4 Preliminary Treatment <br />Expansion of the existing pretreatment facility is recommended to provide future capacity <br />needed to accommodate wet weather flows and provide for consistent operations during <br />dry weather flows. Expansion facilities include the following items: <br /> <br /> New vertical fine screens (1/4-inch opening) <br /> New screenings washer/compactors <br /> New flow measurement structures <br />,, New cyclonic grit separators <br /> New grit pumps and cyclones <br /> New grit classifiers <br /> New screenings/grit hoppers and loadout <br /> <br />The new facilities would be constructed to accommodate 160 mgd of dry weather capacity <br />even though less capacity is required for total wet weather flows. This is because the fine <br />screening technology produces a substantially different screenings product that must be <br />handled separately from the coarse screenings in the existing facility. The facility should be <br />operated so that the frequency with which the existing pretreatment facility would have to <br />be brought on and of tine during dry weather is minimized. Table 7.2.1-1 summarizes the <br />existing and proposed 2025 unit process, equipment, and design criteria. <br /> <br />7.2.5 Odor Control <br />Expanded odor control facilities are recommended to accommodate future odor control <br />needs at the primary clarifiers, new pretreatment addition, existing pretreatment facility, <br />existing WAS thickening facility, expanded WAS thickening facility, and the primary sludge <br />thickening facility. Expanded facilities include the following items: <br /> <br />· New 14-foot-diameter bioscrubber vessels (5 total) <br />o Bioscrubber secondary effluent pump station (2 total) <br /> <br />MWMO_7,0_REV4 DOC 7-5 <br /> <br /> <br />