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Project Name: South Aeration Basin Improvements. <br /> <br />Description: Add step feed, anoxic selectors, and fine bubble diffusers to south <br /> aeration basin. Remove hydraulic restrictions in both south and north <br /> aeration basins (effluent gates). Includes future primary effluent flow <br /> control gates for both north and south aeration basins. <br /> <br />Justification: Increase the dry weather aeration basin treatment capacity to 65 mgd with <br /> respect to ammonia (i.e., with nitrification) and increase the sustained (i.e., <br /> on a weekly basis) wet weather treatment capacity to 130 mgd. <br /> <br />Project Driver: NPDES permit includes ammonia limit requiring nitrification in dry weather <br /> and expansion of wet weather capacity to treat wet weather flows to meet <br /> NPDES monthly and weekly suspended solids limits. <br /> <br />Project Trigger: Maximum month dry weather flow of 25 mgd requiring nitrification. May <br /> flows and temperatures could require the use of the south aeration basins <br /> in conjunction with the north aeration basins. Peak wet weather flows <br /> above 103 mgd require hydraulic modifications. <br /> <br />Type of Project 50% Capacity; 50% Performance <br /> <br />Estimated Project Cost $6,900,000 <br />(2004 Dollars): <br /> <br />Phasing: Budgeted for FY2004/05 <br /> <br />Project Name: Outfall Mixing Zone Study <br /> <br />Description: Update 1994 Mixing Zone Study to account for additional 100 mgd <br /> (approximate) bankside outfall capacity and for changes to the Willamette <br /> River morphology that may have occurred since the last study was <br /> conducted <br /> <br />Justification: <br />Project Driver: <br />Project Trigger: <br />Type of Project 100% Pedormance <br /> <br />Estimated Project Cost $150,000 <br />(2004 Dollars): <br /> <br />Phasing: Budgeted for FY2004/05 <br /> <br /> <br />