FROM: Robert Thompson, General Manager
Originator: Mike Dorman, Director of Engineering
SUBJECT:
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WARNER AVENUE VAULT COVER IMPROVEMENTS, PROJECT NO. FRC-0010
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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 Warner Avenue Vault Cover Improvements, Project No. FRC-0010;
B. Award a Construction Contract Agreement to Minako America Corporation dba Minco Construction for Warner Avenue Vault Cover Improvements, Project No. FRC-0010, for a total amount not to exceed $977,000; and
C. Approve a contingency of $97,700 (10%).
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BACKGROUND
In 2004, Warner Avenue Relief Sewer, Project No. 11-22, built five shallow vaults on Warner Avenue in Huntington Beach. The purpose was to transition a single 21-inch gravity sewer to three parallel 18-inch gravity sewers to avoid utility conflicts. However, the vault covers that were constructed caused noise issues for surrounding residents. In 2014, Repair to Manhole Structures of Warner Avenue Relief Sewer, Project No. FR12-003, replaced the covers with new pre-cast concrete covers that had composite manhole access points to eliminate noise issues. Two of the vault covers were placed below the street grade and covered with asphalt, while three were placed at street grade. Unfortunately, the vaults placed at street grade continued to vibrate under vehicle loading. To mitigate noise and vibration, three small projects were created, but the minor mitigation measures have not worked for two vaults.
RELEVANT STANDARDS
* Comply with California Public Contract Code Section 20103.8, award construction contract to lowest responsive, responsible bidder
* Operate and maintain facilities to minimize impacts on surrounding communities, including odor, noise, and lighting
PROBLEM
Two vaults continue to have noise and vibration nuisances for nearby residents.
PROPOSED SOLUTI...
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