Primary Treatment Rehabilitation at Plant 2, Project No. P2-98

B/C-Side Interim Repair at Plant No. 2, Contract No. P2-98B

Operations Committee Presentation

January 16, 2019

Presented by Rob Thompson

Plant 2 Site Plan

Operations Center

P2-98 Project Area

Major Project Elements

• A, B, and C-Side Primary Clarifiers(14 total)

• Odor Control

• Power Distribution

• Utility Tunnels

• Yard Piping

A-Side Primary Clarifiers Require Replacement

• Built between 1960 and 1963

• Portions of structures have severe corrosion

• Failed clarifier mechanisms

• Subject to liquefaction in earthquake

Active Faults identified in 2017 Study

PC-D

PC-F

PC-E

PC-G

DC-FAPSC

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New Clarifiers and Facilities for P2-98A

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

• C-Side built between 1983 and 1985

• Mild-to-moderate structural damage from corrosion

• Corroded clarifier mechanisms and coversupports

PHASED PROJECTS FACILITATES CONSTRUCTION

P2-98A: Replace A-Side

primary clarifiers; new

odor control system and

power distribution; and

infrastructure

improvements

P2:98B: Provide short-

term repairs (15-year life)

for B/C-Sides primary

clarifiers

P2-98C (now P2-133):

Provide long- term repairs

(+20 years) for B/C-Sides

primary clarifiers and new

odor control system

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P2-98BDesign

P2-98A

Construction

Design Construction

Construction starts 2029

B/C-Side Interim Repair at Plant No. 2Contract No. P2-98B

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

P2-98B: Concrete Pipe Corrosion

96-inch Concrete Pipe RepairReinforcing steel exposure

96-inch Concrete Pipe RepairReinforcing steel exposure in crown

Typical Clarifier Mechanism

Typical Clarifier Mechanism

Outer side of Clarifier

Structural steel around the center column

Dome supports at Clarifier

P2-98B: Clarifier Steel Corrosion

De-lamination

P2-98B Bid Results

Bidder Amount of Bid

Myers & Sons Construction, LLC $8,665,000

Shimmick Construction Company, Inc. $8,755,500

Stanek Constructors, Inc. $10,055,000

Abhe & Svoboda, Inc. $11,365,426

Tharsos, Inc. $12,151,406

Engineer’s Estimate: $8,900,000

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. P2-98B, for a total amount not to exceed $8,665,000; and

• Approve a contingency of $866,500 (10%)

Questions?