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Metropolitan Wastewater Management Commission Capital Improvements Program <br />Digester Mixing Improvements <br />FY OS-06 Capital Budget =Design $50,000, Construct $1,967,000 l <br />''1 <br />Expected cash flow: FY OS-06 $2,017,000. <br />The 2004 Facilities Plan identifies the need to provide additional solids stabilization volume. This <br />project includes design and construction of digester mixing improvements that will increase the <br />active volume of the existing three digesters, thus allowing for additional solids stabilization <br />volume. This will be accomplished by replacing the existing gas mixing system with a pump <br />mixing system. This project will also defer the need to construct an additional digester. <br />Design work and the beginning of construction is planned for 2005. The remaining construction <br />work is planned for 2006 and 2007. <br />Primary Clarifier Enhancements <br />FY 05-06 Capital Budget = $1,220,000 <br />Expected cash flow: * FY OS-06 $1,220,000 <br />The preferred alternative for treating peak flows in the 2004 MWMC Facilities Plan is called <br />Parallel Primary/Secondary Treatment. In this alternative, peak flows up to 160 million gallons <br />per day (mgd) will receive primary treatment in the primary clarifiers and be diverted around the <br />aeration basins and secondary clarifiers. Flows greater than 140 to 160 mgd will be treated in the <br />aeration basins and secondary clarifiers. The two flows will be blended back together and receive <br />chlorine disinfection before being discharged. The Primary Clarifier Enhancements project <br />includes design and construction of baffling in the primary clarifiers and removal of hydraulic <br />restrictions. Enhancing the existing clarifiers will increase primary treatment capacity, increase <br />capacity to treat base and peak flows, and improve effluent quality and reliability so that a blended <br />primary and secondary effluent-can meet the current NPDES total suspended solids limits. Staff <br />will be coordinating system improvements that relate to needed equipment replacement <br />components and funding. <br />Design upgrades on four clarifiers are planned for 2005. Construction work on the primary <br />clarifiers is planned for 2005 to 2007. <br />Secondary Clarifier Enhancements <br />FY OS-06 Capital Budget =Design $420,000, Construct $5,321,000 <br />Expected cash flow: * FY OS-06 $1,845;000; FY 06-07 $2,500,000; FY 06-07 $1,396,000 <br />This project is part of the overa112004 MWMC Facilities Plan strategy to increase the peak flow (. <br />treatment capacity. The project includes design and construction of baffling, inlet energy <br />dissipation, changing out of the flocculation well, construction of an outboard launder, and <br />retrofitting of the suction header for the existing eight clarifiers. It also includes secondary gates. '' <br />Enhancing the existing clarifiers will increase the secondary treatment capacity, alleviate current ~ <br />operational problems, and increase secondary treatment capacity for. base and peak flows...... <br />Effluent quality and performance reliability will also be improved. Staff will be coordinating <br />system improvements that relate to needed equipment replacement components and funding. ~ <br />Page 29 FY OS-06 BUDGET AND CIP <br />