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TABLE 7.2,1-1 Liquid Processes Design Cdlefia, Existing and 2025 Capacity Needs MWMC Facilities Plan, Eugene-Springfield Unit Process Existing Criteria/Conditions Year 2025 HRT, hours @ Q[~w^ 7.84 hr 11.58 hr HRT, hours @ QDWMM NA 7.54 hr HRT, hours @ Qww~M NA 4.02 hr HRT, hours @ QWWPH 2.45 hr 2.78 hr Temp (C) @ QDsu~,~ 60 deg. F (May 1996) 60 deg. F (May 1996) Temp (C) @ QwsMM 54 deg. F (May 1996) 54 deg. F (May 1996) Pd TSS Rem (%) @ Q[~w^ 50% 50% Pri TSS Rem (%) @ Qww^ 50% 50% Pn CBOD Rem (%) @ QDWA 32% Pti CBOD Rem (%) @ QwwA 30% SRT (days) @ Q[~wuM 9.5 SRT(days) @ Qwwu~ 9.5 MLSS-average (rog/L) @ QDSMM ~: MLSS-average (mg/L) @ Q~s~M 3,427 mg/L Net Y~eld (WAS-TSSICBOD) applied @ QosM~ 1 lb/lb Net Yield (WAS-TSS/CBOD) applied @ OwsM~ 1 lb/lb Blowers Number of Units 8 6 Capacity, Each 10,500 to 17,000 clm 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 (RSFI) Suction Header Capacity, Total Peak 134 mgd 167 mgd Design Criteda - Peak Overflow Rate SOR= 1,050 gpd/f¢ $OR= 1,260 gpd/ft2 Design Criteria- Solids Loading @ DWMM & 15 lb/day-fO WWMM Design Cdteda - Solids Loading @ WWPH 37 Ib/day-ft2 Number of Units 8 10 Diameter, ft 130 ft 130 it Sidewater Depth 14 fl 14 ft Actual SOR @ Qww~, all un,ts in service NA 835 gpd/¢ Actual SOR @ QwwA, all units in service 659 gpd/f¢ 514 gpd/ft2 Actual SOR @ QwwP~, all units in service 1,648 gpd/ft2 1,205 gpd,'lt2 RAS Flow (percent o~ influer~t flow) @ Q~w~ 30-35°/° 38.7% RAS Flow (percent of influent flow) @ QwwM~ 30% 38.7% TERTIARY TREATMENT (of Secortdar¥ Treatment Effluent) Secondary Effluent Filters Number of units NA 8 Filter Type NA Multi-media Surface Area, each NA 7,200 f~ MWMC_TABLE 7,2.1-1_REV7 DOC 4