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TABLE 7.2.1-1 Liquid Processes Design Criteria, Existing and 2025 Capacity Needs MWMC Facilities Plan, Eugene-Springfield Unit Process Existing Criteria/Conditions Year 2025 HRT @ OwwPH 5 rain 6.25 min Volume, each/Total 152,000 gal / 608,000 gal 152,000 gal / 608,000 gal Length x Width 130-ft 2-in x 13-ft 130-ft 2-in x 13-ft Capacity, each//Total @ QDWA 14.6 mgd/58.4 mgd 9.6 mgd/38.4 mgd PRIMARY CLARIFICATION Primary Clarifiers Design Criteria SOR = 1,250 gpd/ft2 @ 71.5 mgd Diameter 135 fl 135 ft Side Water Depth 12 ft 12 ft Number of Units 4 4 Actual SOR @ QWWPH all units in service 3,056 gpd/ft2 2,794 gpd/ft2 Actual SOR @ QWWMM w/1 unil out of service NA 1,935 gpd/ft2 Actual SOR @ QwwA all units in service 1223 gpd/ft2 1,191 gpd/ft2 Actual SOR @ QDWMM all units in service NA 1,036 gpd/ft2 Actual SOR @ QDWA all units in service 856 gpd/ft2 671 gpd/ft2 TSS Removal % @ QWWPH 0 % 40% TSS Removal % @ QwwA 50% 50% TSS Removal % @ QDWA 50% 50% Primary Treatment Diversion Pumps Number of units NA 4 Capacity, each/total NA 50 mgd/200 mgd Type NA Vertical Turbine SECONDARY TREATMENT Step Feed With Anoxic Selector Process Parameters SRT in July through Sept., days 5 days until 2010; 6 days from 2010 to buildout DO, mg/L 2 Dry Season Temperature in Biological Process, 20 °C Wet Season Temperature in Biological 12 Process, °C Dry Season Max Month MLSS, mg/L 3,200 Wet Season Max Month MLSS, mg/L 2,200 Period for Complete Nitrification July - September July - September Aeration Basins Number of Basins 2 (8 cells) 2 Step Feed Basins (4 cells per train) Volume, Each/Total 2 Mgal/16 Mgal 9.5 Mgal/19 Mgal Sidewater Depth 15 ft 17 ft Number of Aerobic Zones 8 4 cells per basin Number of Anoxic Zones NA 4 cells per basin MWMC_TABLE 72.1A_REV7.DOC 3