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
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• • Thompson
- Assistant General Manager
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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
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Tight spaces make i `�
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construction difficult �� _ L
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• Construction requires
full bypassing of x�
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p p
station
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• Avoids overlap between
construction and
operational activities
• Eliminates risks of leaks ;;
during construction
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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
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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.