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SOUTH AERATION BASIN IMPROVEMENTS Facility Process Component Secondary Treatment $7,603,000 Total Cost PRIOR Costs EXPEND- 2005-06* 2006-07 2007-08 2008-09 2009-10 TOTAL ITURES Design & Engineering 100,000 590,000 690,000 Construction 6~913,000 6~913,000 TOTAL 100,000 7~503,000 0 0 0 0 7~603,000 FUNDING SOURCE Capital Reserve 100,000 6,103,000 6,203,000 SDC Improvement Reserve 1,400,000 1,400,000 TOTAL 100,000 7,503,000 0 0 0 0 7,603,000 * Inflated from 2004 by 6.3% to FY05-06 dollars (Engineering News Record factor) and 4% thereafter PROJECT: South Aeration Basin Improvements Design and Construction DESCRIPTION: Add step feed, anoxic selectors, and fine bubble diffusers to south aeration basin. Remove hydraulic restrictions in both south and north aeration basins (effluent gates). Includes future primary effluent flow control gates for both north and south aeration basins. JUSTIFICATION: Increase the dry weather aeration basin treatment capacity to 65 mgd with respect to ammonia (i.e., with nitrification) and increase the sustained (i.e., on a weekly basis) wet weather treatment capacity to 130 mgd. PROJECT DRIVER: NPDES permit includes ammonia limit requiring nitrification in dry weather and expansion of wet weather capacity to treat wet weather flows to meet NPDES monthly and weekly suspended solids limits. PROJECT TRIGGER: Maximum month dry weather flow of 25 mgd requiring nitrification. May flows and temperatures could require the use of the south aeration basins in conjunction with the north aeration basins. Peak wet weather flows above 103 mgd require hydraulic modifications. TYPE OF PROJECT: 50% Capacity; 50% Performance ESTIMATED PROJECT COST $6,900,000 (FY 2004-05 Dollars): INFLATED PROJECT COST $7,603,000 (FY 2005-06 Dollars): PHASING: Budgeted for FY 2004/05, Rebudgeted for FY 2005/06 Page 69 FY 05-06 BUDGET AND CIP