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7. RECOMMENDED PLAN <br /> <br />FIGURE 7.2.3-1 <br />Recommended Pdmary Clarifier Enhancements <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> New Scum New Energy New Weir and <br /> ' Scum Baffle <br /> /' Skimmer Arms Dissipating <br /> / Inlet With Gates "NN <br /> , New Dmlsi~ <br /> ---- ~ New Current Baffle .... <br /> /, Feedwetl PE <br /> <br /> Existing <br /> Influent Existing Sludge <br /> Column Removal Mechanism <br /> / <br /> / <br /> Primary Sludge <br /> Hopper <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 screeningswasher/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 offline during dry weather is minin-dzed. Table 7.2.1-1 summarizes the <br />existing and proposed 2025 trait process, equipment, and desigm 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 />· Bioscrubber secondary effluent pump station (2 total) <br /> <br />MWMC_7.0_REV4.DOC 7-5 <br /> <br /> <br />