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HomeMy WebLinkAboutLATE PPP Item No. 8 P1-129 Ops Presentation 2018-10-03 RAS PUMP STATION 40 Return Activated Sludge Piping Replacement at Activated Sludge Plant No. 1, Project No. P1-129 Y _ t • • Thompson - Assistant General Manager r Operations Committee RAS Piping Replacement • Activated Sludge Plant 1 . (built in 1974) provides 90 mgd of treatment capacity • Divided into two halves, both need to be in service for normal operation • 220 feet of 30-inch piping corroding, causing multiple leaks RAS Piping • p Tight spaces make i `� g construction difficult �� _ L - • Construction requires full bypassing of x� Y p g um p p station w • Avoids overlap between construction and operational activities • Eliminates risks of leaks ;; during construction 4 ti Bypass Pumping • Full bypass pumping needed for 9 months • Propose to use 3 engine- _ driven pumps with piping and controls • Original plan anticipated Contractor to rent pumping - • Similar need for bypass pumping on Plant 1 Headworks Rehab, other projects and pump stations _ • Propose to purchase pumps instead of renting Project Current Budget -' -I Requested Budget Construction Cost $4.7 million $5.8 million Project Budget $7.9 million $9.0 million y 4 j' "4 F R" Recommendation • Approve a budget increase of $ 1, 100,000 for Return Activated Sludge Piping Replacement at Activated Sludge Plant No. 1, Project No. P1-129, for a total budget amount of $9,000,000.