HomeMy WebLinkAboutItem 12 PPP 12-05-18 Ops Committee - P2-123 Budget Increase _ -- _a ��r
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Returned Activated Sludge Piping Replacement at
Plant 2, Project No . P2- 123
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THE
Project
Original P2-123 Piping
8
P2-118 Elements
FE18 04 Elements
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Project Elements
Current Scope
• P2-123 _ Replace 2,000 linear feet of leaking Return
Activated Sludge piping
Proposed Combined Scope
• P2-118 _ Repair corroded and cracked concrete
• FE18-04 _ Replace corroded light poles
P 2 121,113 P I U
• a I ve j������11111kd d I t i o n
I WO Insert twelve plug valves to allow
isolation of clarifiers
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P2 =1 18 ProjectJ Objectives
• Mitigate Oxygen Release
• Crack repair _
• Expanding polyurethane
• Maintain Structural ,
Integrity of Basin Deck - _.
• Spall repair :a
Replace corroded
reinforcement r
i
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y .y
Spall
- = • Hollow concrete but no
visual spalling
Sounding test revealed 4x
more spalling than originally
--.{ designed for
loe
SpaII--
7
extents of hollow
sounding
concrete.yet no
visual surface
/ spalling
f original
demarcated area
that was visually
.. spalled on surface
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Crack
I ... L
• Extensive
cracking yielded
approximately 2x
more cracking
than estimated
71.
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4 ��'M
FE =18 =04 Objectives
ProJject
• Replace corroded light poles
and fixtures at AS Basins and
Secondary Clarifiers099
— High-efficiency LED
fixtures with dark sky
i shielding
r g
,: �•�� • Collapsible poles for
P
o
better maintenance '90 y r
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F access j THEcr�NC ENV\Poaa*
Reasons for Combined Construction
• Overlapping locations
• Schedule and risk reduction
• Economy of scale
Budget
CurrenLBu
,Jget Proposed Budget BudgetChange
P2-123 Piping $12,7501000 $20,000,000 $7,250,000
Replacement
P2-118 Aeration $2,800,000 $1,800,000 ($1,000,000)
Basin Deck Repair
FE18-04 Light Pole $1,950,000 $200,000 ($1,750,000)
Total $4,500,000*
* Addition funding:
$4,500,000 reduction in Plant No. 2 Digester Facilities Rehabilitation, Project
No. P2-91-1. This reduction is a result of an unrelated reduction in the anticipated
cost of that project.
Recommendations
• Approve a budget increase of $7,250,000 for Return
Activated Sludge Piping Replacement at Activated
Sludge Plant No. 2, Project No. P2-123, for a total
budget of $20,000,000.
Questions