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Metropolitan Wastewater Management Commission Capital Improvement Program <br /> <br />PRIMARY SLUDGE THICKENING <br />Description: <br /> Thin primary sludge pumping and piping systems to gravity thickeners, install gravity <br />thickener system (covered for odor control), supernatant overflow pumping and piping, <br />thickened sludge piping/pumping to digesters. See Odorous Air Treatment for treatment <br />of odors. <br />Status: <br />As of December 21, 2009, the project is in the design development phase. HDR <br />Engineering is the MWMC consultant and they will be submitting a 30% level of design in <br />January of 2010 for project team review. <br />Justification: <br /> Thicken sludge before the digester system and help keep the sludge blanket lower in <br />primary clarifiers to avoid washout of the sludge blanket during peak flow events. <br />Project Driver: <br />Meet class B biosolids requirements during peak two-week solids loading event with all <br />three existing digesters in service. <br />Project Trigger: <br />Availability of sludge thickening capacity is needed prior to next scheduled digester <br />cleaning (i.e., before 2013). <br />Project Type: <br />100% Capacity <br />Improvement <br /> SDC Eligibility: <br />65% <br />Estimated Project Cost <br />: $4,498,000 (part of the project money will support the treatment plant landscape <br />upgrades). <br />Expected Cash Flow: <br />FY 07-08 = $9,730; FY 08-09 = $40,286, FY 09-10 = $2,000,000; <br />FY 10-11 = $2,430,000; FY 11-12 = $17,984 (administration, construction, landscape, <br />consultant services, etc.) <br />Prior2009-10 <br />Expenditure/Category:YearsEst. Act.2010-112011-122012-132013-142014-15Total <br />Design/Construction $50,016 $2,000,000 $2,447,984 0000$4,498,000 <br />0000000 <br />Other 0 <br />Total Cost $50,016 $2,000,000 $2,447,984 $0$0$0$0$4,498,000 <br />Page 59 DRAFT FY 10-11 BUDGET AND CIP <br />