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Metropolitan Wastewater Management Commission Capital Improvement Program <br />AERATION BASIN IMPROVEMENTS – PHASE 2 <br />(P80100) <br />Description: <br /> Recent recommendations are to evaluate and consider improving some of the secondary <br />treatment systems. Upcoming early work items to be evaluated are changes to the <br />existing air piping, change to the diffuser/mixing systems, and consider upgrading older <br />blower equipment. Future upgrades include adding step feed, anoxic selectors, and fine <br />bubble diffusers to 4 of the 8 cells of the aeration basins and make hydraulic <br />improvements. This project was originally the North Aeration Basin Improvements <br />project; however, the Phase 1 study/design phase showed that improvements to the four <br />eastern most basins as a first phase would allow for better hydraulics and more <br />operational flexibility. The project scope increased to include replacement of existing <br />aeration basin gates valves, and spray system. <br /> <br /> <br />Status: <br />Planned for future implementation. <br />Justification: <br /> Improve secondary treatment process. Increase the dry weather aeration basin treatment <br />capacity with respect to ammonia (with nitrification) and increase the wet weather <br />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). <br />Improvement <br />SDC Eligibility: <br />58.7% <br />Estimated Project Cost: <br />$16,500,000 <br />Estimated Cash Flow: <br />FY 19-20 = $985,000; FY 20-21 = $1,000,000; FY 21-22 = $15,000; FY 22-23 = $0; <br /> FY 23-24 = $1,500,000; FY 24-25 = $6,500,000; FY 25-26 = $6,500,000 <br />Prior2018-19 <br /> Expenditure/Category:YearsEst. Act. <br />2019-202020-212021-222022-232023-24Total <br /> Design/Construction$0$0$1,000,000$1,000,000$0$0$1,500,000$3,500,000 <br /> Other$0$0$0$0$0$0$0$0 <br />Total Cost$0$0$1,000,000$1,000,000$0$0$1,500,000$3,500,000 <br />Page 51 FY 19-20 BUDGET AND CIP <br />- ¸ ΐΒǾ ΑΏΐΘǾ 7®±ª 3¤²²¨®­ ȟ )³¤¬ Β# <br /> <br />