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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, hours @ QDW^ 7.84 hr 11.58 hr HRT, hours @ QDWMM NA 7.54 hr HRT, hours @ QWWMM NA 4.02 hr HRT, hours @ QWWPH 2.45 hr 2.78 hr Temp (C) @ QDSMM 60 deg. F (May 1996) 60 deg. F (May 1996) Temp (C) @ QWSMM 54 deg. F (May 1996) 54 deg. F (May 1996) Pri TSS Rem (%) @ QDWA 50% 50% Pri TSS Rem (%) @ Qww^ 50% 50% Pri CBOD Rem (%) @ QDWA 32% Pri CBOD Rem (%) @ QWWA 30% SRT (days) @ QDWMM 9.5 SRT(days) @ QWWMM 9.5 MLSS-average (mg/L) @ QDSMM MLSS-average (mg/L) @ QWSMM 3,427 mg/L Net Yield (WAS-TSS/CBOD) applied @ QDSMM I lb/lb Net Yield (WAS-TSS/CBOD) applied @ QWSMM 1 lb/lb Blowers Number of Units 6 6 Capacity, Each 10,500 to 17,000 cfm 10,500 to 17,000 cfm Hp, Each 1000 hp 1000 hp Type 5 stage centrifugal 5 stage centrifugal Control Constant Speed Constant Speed Secondary Clarifiers Mechanism Type Rapid Sludge Removal (RSR) Suction Header Capacity, Total Peak 134 mgd 167 mgd Design Criteda - Peak Overflow Rate SOR= 1,050 gpd/~ SOR= 1,260 gpd/ft2 Design Criteria - Solids Loading @ DWMM & 15 Ib/day-ft2 WWMM Design Criteria - Solids Loading @ WWPH 37 Ib/day-ft2 Number of Units 8 10 Diameter, ft 130 ft 130 ft Sidewater Depth 14 ft 14 ft Actual SOR @ QWWMM, all units in service NA 835 gpd/ft2 Actual SOR @ QwwA, all units in service 659 gpd/ft2 514 gpd/~ Actual SOR @ QwwP., all units in service 1,648 gpd/ft2 1,205 gpd/ft2 RAS Flow (percent of influent flow) @ QDWMM 30--35% 38.7% RAS Flow (percent of influent flow) @ QWWMM 30% 38.7% TERTIARY TREATMENT (of Secondary Treatment Effluent) Secondary Effluent Filters Number of units NA 8 Filter Type NA Multi-media Surface Area, each NA 7,200 ft2 MWMC_TABLE 7.2.1-1_REV7.DOC 4