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Metropolitan Wastewater Management Commission Capital Improvement Program <br />AERATION BASIN IMPROVEMENTS – PHASE 2 <br />Description: <br /> Aeration Basin (Phase 2): Add step feed, anoxic selectors, and fine bubble diffusers to 4 <br />of the 8 cells of the aeration basins and make hydraulic improvements. This project was <br />originally the North Aeration Basin Improvements project; however the Phase 1 <br />study/design phase showed that improvements to the four eastern most basins as a first <br />phase would allow for better hydraulics and more operational flexibility. <br /> <br /> In January 2016, the project scope and cost (estimate $750Kin 2015) increased to <br />include replacement of existing aeration basin gates, valves and spray system. <br />Status: <br />The Aeration Basin (Phase 2) project is anticipated to start design development in fiscal <br />year 19-20 with consultant services. <br />Justification: <br /> Increase the dry weather aeration basin treatment capacity with respect to ammonia (with <br />nitrification) and increase the wet weather treatment capacity. <br />Project Driver: <br />National Pollution Discharge Elimination System (NPDES) permit includes ammonia <br />limit requiring nitrification in dry weather and expansion of wet weather capacity to treat <br />wet weather flows to meet NPDES permit monthly and weekly suspended solids limits. <br />Project Trigger: <br />Address water quality requirements (need to evaluate the requirements based on the <br />MWMC next NPDES permit renewal that might be issued in 2018). <br />Project Type: <br />50% Capacity; 50% Performance <br />Improvement <br />SDC Eligibility: <br />58.7% <br />Estimated Project Cost: <br />$16,100,000 (funding for administration, design,permits, construction, etc.) <br />Estimated Cash Flow: <br />FY 19-20 = $1,450,000; FY 20-21 = $6,800,000; FY 21-22 = $7,150,000; <br /> FY 22-23 = $700,000 <br />Prior 2016-17 <br />Expenditure/Category:YearsEst. Act.2017-182018-192019-202020-212021-22Total <br />Design/Construction$0$0$0$0$4,300,000 $6,000,000$5,800,000$16,100,000 <br />Other$0$0$0$0$0$0$0$0 <br />Total Cost$0$0$0$0$4,300,000$6,000,000$5,800,000$16,100,000 <br />Page 56FY 17-18 BUDGET AND CIP <br /> <br />