HomeMy WebLinkAboutItems 5_6 PPP 01-16-19 Operations Comm Meeting - P2-98 s w� -,� 'r * _ '�I� '`.- ��►S �L,.4 is
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Primary Treatment Rehabilitation at Plant 2, Project No. P2-98
6/C-Side Interim Repair at Plant No. 2, Contract No. P2-986
Operations - - Presentation
January • 2019
Presented by Rob Thompson
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Plant 2 Site Plan
P2-98 Project Area �
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Major ro ec emen s
I I ^� SOUTH SCRUBBER ,
• A B a n d C S i d e 1 COMPLEX
DISTRIBUTION STRUCTURE A
Primary Clarifiers NORTH SCRUBBER
COMPLEX
( 14 tota I )
B SIDE ASIDE
• Odor Control --
C SIDE
DISTRIBUTION STRUCTURE B•
Power Distribution00
• Utility Tunnels r _ AL -J:
• Ya rd Piping DISTRIBUTION STRUCTURE C �
A=Side PrimaryClarifiers Require
Replacement
• Built between 1960 and -
1963
• Portions of structures have
severe corrosion
• Failed clarifier mechanisms t
• Subject to liquefaction in
earthquake
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Why Move the A=Side Clarifiers ?
• Avoid construction over active fault.
• Existing A-Side clarifiers remain available during
construction — avoids delay of OCWD GWRS Expansion .
• Frees larger area for future secondary process to
replace aging Activated Sludge Plant
B/C =Side Clarifiers Require
Rehabilitation
• B-Side built between 1967 and 1972
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• C-Side built between 1983 and 1985 _
• Mild-to-moderate structural damage
from corrosion
• Corroded clarifier mechanisms and cover
supports
PHASED PROJECTS FACILITATES
CONSTRUCTION
P2-98A: Replace A-Side
primary clarifiers; new
odor control system and 2 -98A
power distribution; and
infrastructure Design Construction
improvements
P2.98B: Provide short- N N N N N N N N N
term repairs (15-year life) o 00 ko o W Ln
o
for B/C-Sides primary Design Construction
clarifiers
P2-98C (now P2-133): vz -�MB
Provide long- term repairs
(+20 years) for B/C-Sides Construction starts 2029
primary clarifiers and new
odor control system
BIC =Side Interim Repair at Plant No. 2
Contract No. P2=9813
Major Contract Elements
• Repair of cracks in concrete pipe and structural
walls.
• Repair of clarifiers' steel mechanism .
• Lining of process piping .
P2 =98B : Clarifier Concrete Repair
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b PRIMARY CL4AIFIER
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.y . . - 140'DIA
P2 =98Bm. Concrete Pipe
Corrosion
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96-inch Concrete Pipe Repair 96-inch Concrete Pipe Repair
Reinforcing steel exposure in crown Reinforcing steel exposure
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Typical Mechanism
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P2 =9813 : Clarifier Steel Corrosion
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Structural steel around
the center column
(,A De-lamination it
Dome supports at Clarifier
P2 =98B Bid Results
Bidder Amount of Bid
Myers & Sons Construction, LLC $81665,000
Shimmick Construction Company, In $8,755,500
$101055,000
$11,365,426
Stanek Constructors, Inc.
Abhe & Svoboda, Inc.
Tharsos, Inc. $12, 151,406
Recommendation :
PCSA
• Approve a Professional Construction Services (PCSA)
Agreement with Black & Veatch Corporation to provide
construction support services for B/C-Side Primary
Clarifiers Interim Repair at Plant No. 2, Contract No. P2-
98B, for a total amount not to exceed $549,534; and
• Approve a contingency of $54,953 (10%)
Recommendation :
Construction Contract
• Award a Construction Contract to Myers & Sons
Construction, LLC for B/C-Side Primary Clarifiers
Interim Repair at Plant No. 2, Contract No. P2-9813 , for
a total amount not to exceed $8,665,000; and
• Approve a contingency of $866,500 ( 10%)
Questions ?.