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TABLE 7.2.t-1 <br />Liquid Processes Design Criteria, Existing and 2025 Capacity Needs <br />MWMC Facilities Plan, Eugene-Springfield <br /> <br /> Unit Process Existing Criteria/Conditions Year 2025 <br />HRT @ QwwP~ 5 min 8.25 rain <br />Volume, each/Tota~ 152,000 gal / 608,000 gal 152,000 gal / 608,000 ga~ <br />Length x Width 130-fi 2-in x 13-ff 130-ft 2-in x 13-ft <br />Capacity, each//Tota~ @ QDWA 14.6 mgd/5&4 mgd 9.6 mgd/38.4 mgd <br />PRIMARY CLARIFICATION <br />Primary Ciarifiers <br />Design Criteria SOR = 1,250 gpd/ft2 @ 71.5 <br /> mgd <br />Diameter 135 ft 135 ft <br />Side Water Depth 12 ft 12 ft <br />Number of Units 4 4 <br />Actual SOR @ QwwP~ all units in servme 3,058 gpd/ft~ 2,794 gpd/f¢ <br />Actual SOR @ QwwMM W/1 untt out of service NA 1,935 gpd/ft2 <br />Actual SOR @ Qww^ all unrts in service 1223 gpd/~ 1,191 gpd/ft2 <br />Actual SOR @ QOWMM all units in service NA 1,036 gpd/ff2 <br />Actual SOR @ QDw^ all umts in service 856 gpd/ft2 671 gpd/ft2 <br />TSS Removal % @ QwwP~ 0 % 40% <br />TSS Removal % @ QwwA 50% 50'/0 <br />TSS Removal % @ QDWA 50% -50% <br />Primary Treatment Diversion Pumps <br />Number of units NA 4 <br />Capacity, each/total NA 50 mgd/200 mgd <br />Type NA Vertical Turbine <br /> <br />SECONDARY TREATMENT <br /> <br />Step Feed With Anoxic Selector Process Parameters <br />SRT in July through Sept., days 5 days until 2010; 6 days from <br /> 2010 to buildout <br />DO, mg/L 2 <br />Dry Season Temperature in Biological Process, 20 <br />°C <br />Wet Season Temperature in B~ological 12 <br />Process, °C <br />Dry Season Max Month MLSS, mg/L 3,200 <br />Wet Season Max Month MLSS, mg/L 2,200 <br /> Period for Complete Nitnfication July - September July - September <br /> Aeration Basins <br /> Number of Basins 2 (8 cells) 2 Step Feed Basins <br /> (4 cells per train) <br /> Volume, Each,"Totat 2 Mgal/16 Mgal ~).5 Mgab/19 Mgal <br /> Sidewater Depth 15 ft 17 ft <br /> Number of Aerobic Zones 8 4 cells per basin <br /> Number of Anoxic Zones NA 4 cells basin <br /> per <br /> <br /> MWMC~TABLE 721-1_REV7 DOC 3 <br /> <br /> <br />