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File #: 2019-621    Version: 1 Name:
Type: Non-Consent Status: Passed
File created: 9/19/2019 In control: OPERATIONS COMMITTEE
On agenda: 12/4/2019 Final action: 12/4/2019
Title: ACTIVATED SLUDGE PLANT CLARIFIER INLET GATE REPLACEMENT AT PLANT NO. 2, PROJECT NO. MP-638
Sponsors: Kathy Millea
Attachments: 1. Agenda Report, 2. MP-638 Contract Agreement
Related files: 2019-823
FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering

SUBJECT:

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ACTIVATED SLUDGE PLANT CLARIFIER INLET GATE REPLACEMENT AT PLANT NO. 2, PROJECT NO. MP-638
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GENERAL MANAGER'S RECOMMENDATION

recommendation
RECOMMENDATION: Recommend to the Board of Directors to:

A. Receive and file Bid Tabulation and Recommendation for Activated Sludge Plant Clarifier Inlet Gate Replacement at Plant No. 2, Project No. MP-638;

B. Award a Construction Contract to Innovative Construction Solutions for Activated Sludge Plant Clarifier Inlet Gate Replacement at Plant No. 2, Project No. MP-638, for a total amount not to exceed $658,300; and

C. Approve a contingency of $65,830 (10%).
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BACKGROUND

The Activated Sludge Plant at Orange County Sanitation District (Sanitation District) Plant No. 2 has 12 rectangular clarifiers that are a key part of the biological secondary treatment process. Each clarifier has three inlet gates that allow water to enter the clarifier for the final sludge settling process and protect workers from being engulfed during maintenance activities in the clarifier. These gates are subject to wear and corrosion and have been in service for over 40 years.

RELEVANT STANDARDS

* Comply with California Public Contract Code Section 20103.8: Award construction to lowest responsive, responsible bidder
* Maintain a proactive asset management program
* Provide a safe and collegial workplace

PROBLEM

Several gates have become inoperable due to corrosion and deterioration. An inoperable gate prevents a clarifier from being taken out of or put into service. Staff has determined that all 36 gates are corroded to some degree and have reached the end of their useful life.

PROPOSED SOLUTION

Award a construction contract for Activated Sludge Plant Clarifier Inlet Gate Replacement at Plant No. 2, Project No. MP-638, to replace the inlet gates.

TIMING CONCERNS

The inlet gates need to be reli...

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