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3. EXISTING WASTEWATER FACILITIES <br /> <br />TABLE 3.2.1-1 <br />Original Plant Construction and Facilities <br />MWMC Facilities plan, Eugene-Springfield <br /> <br /> Construction Project Year Description <br /> <br />Final Treatment 1984 Four effluent Parshall flumes, four chlorine contact basins, <br /> sulfonation chamber, chemical building, plant water pump <br /> station, outfall structure, diffuser outfall, and bankside outfall <br /> <br />Secondary Control Complex 1984 Blower building, retum activated sludge pump station <br /> <br />Solids Processing 1984 Add one new gas mixed primary digester, add gas mixing <br /> building for existing two primary digesters, new boiler building, <br /> modify floating covers on existing two biosolids storage tanks, <br /> add polymer teed for flotation thickener <br /> <br />Seasonal Industrial Waste Site, Pump 1984 Industrial pump station, irrigation control building, aeration <br />Station, and Site Work basin, lagoon, and center pivot irrigation system <br /> <br />Phase 1 Biosolids Facilities 1985 Onsite dewatering facility using centrifuges, biosolids storage <br /> tank, polymer <br /> <br />Operations Building 1984 Operations building and laboratory <br /> <br />Maintenance Building 1984 Maintenance building, covered storage building, storage <br /> buildings and steam cleaning building <br /> <br />Subsequent upgrades to the original facilities and the addition of new facilities have been <br />completed since the initial plant came on line. Table 3.2.1-2 summarizes the major <br />construction contracts associated with facility upgrades and additions. The end result of <br />these construction projects is the facility as it stands today (Figure 3.2.1-1). <br /> <br />TABLE 3.2.1-2 <br />Plant Upgrades and Additional Facilities <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> Construction Project Year Description <br /> <br />North Aeration Basin Upgrades 1996 Converted three of four north aeration basins from coarse <br /> bubble air diffusers to fine bubble membrane diffusers <br /> <br />North Aeration Basin Upgrades 2002 Replaced membrane diffusers in aeration basin No. 3 <br /> <br />North Aeration Basin Upgrades 2003 Replaced membrane diffusers in aeration basin Nos. 1 <br /> and 2 <br /> <br />Pretreatment Upgrades 1995 Replaced comminutors with five vertical coarse screens <br /> and screening sluice system, new grit and solids <br /> dewatering equipment, and biofilter <br /> <br />Biosolids/Biocycle Farm Reclaim water 2004 Constructed 3.2-mgd plant effluent water line to BMF for <br />line non-potable water use and tree farm irrigation <br /> <br />MWMC_3.0_REV11.DOC 3-7 <br /> <br /> <br />