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II, <br /> Metropolitan Wastewater Management Commission Capital Improvements Program <br /> <br /> I <br /> Digester Mixing Improvements <br /> FY OS-06 Capital Budget =Design $50,000, Construct $1,967,000 <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 /> e <br /> d receiv <br /> blended back to ether an <br /> aeration basins and secondary clarifiers. The two flows will be g <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 /> 'i•~ <br /> Secondary Clarifier Enhancements <br /> FY 05-06 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 /> onstruction of bafflin inlet ener <br /> t acit .The ro'ect includes desi and c y <br /> treatmen ca g g <br /> P J <br /> p Y <br /> dissi ation, changing out of the flocculation well, construction of an outboard launder, and <br /> P <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 /> ii <br /> Page 29 FY OS-06 BUDGET AND CIP <br /> <br />