HomeMy WebLinkAboutItem No. 7 PPP P1-101 PPP Sludge Dewatering and Odor Control P1 ■ � ,� Sludge Dewatering
and Odor Control
9 Fill MMMMMW� at Plant No . 1
Project No . P1 =101
Operations Committee
1 \� ■ 'n`.a' �� July 10, 2019
• Replace aging sludge dewatering facilities
• Lower biosolids management costs by reducing
water content.
• Improve sludge thickening to avoid the need to
construct new digesters.
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Project Scope _
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Replacement
PRIMARY THICKENING Replacement Rehabilitation
CLARIFIER CENTRIFUGE DIGESTER
DEWATERING CAKE CAKE
CENTRIFUGE STORAGE LOADOUT
SECONDARY
CLARIFIER
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Construction 99% complete
• Dewatering centrifuges complete
• Existing dewatering facilities _
demolished
• Thickening centrifuges testing in
progress
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Project Challenge
• Started testing thickening system
• Testing impacted by unknown material buildup
• Affects density meters & piping
• Evaluating causes & options -
Consultant Cost
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• Process troubleshooting support
— Research & resolve unknown material buildup
• Allowance for concept development
— Develop options to mitigate unknown material condition
• Project closeout support
— Accurately document all as-built conditions & design changes
Contract Contingency
Status
Additional Contingency Requirements
Process Troubleshooting Support $ 160,000
Allowance for Concept Development $ 67,000 1%
Project Closeout Support $ 130,000 2%
Total $357,000 5%
Original Consultant Contract $ 71140,000 (5%)
Original Contingency Amount $ 571,200 (8%)
Currently Authorized Contingency $ 21142,000 (30%)
Total Contingency with this request $ 21499,000 (35%)
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• Currently project budget is $ 199 ,500 ,000
• Project budget is sufficient for this action
• Remaining project activities
— Resolution of unknown material buildup
— Successful commissioning of Thickening System
— Dewatering & Thickening Systems performance testing
Recommended Acti
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• Approve a contingency increase of $357 , 000 (5%)
to the Professional Consultant Services
Agreement with HDR Engineering , Inc. to provide
construction support services for Sludge
Dewatering and Odor Control at Plant No . 1 ,
Project No . P1 - 101 , for a total contingency
amount of $2 ,499 ,000 (35%).
Questions '?.
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