To: Honorable Mayor and Members of City Council
From: Phil Brun, Utilities Director
Prepared By: Chris Jones, Associate Civil Engineer
TITLE:
Title
Repair and Rehabilitation of 36-inch Water Main Crossing Redwood Creek
LABEL
RECOMMENDED ACTION:
Recommendation
Authorize the Utilities Director to negotiate and execute a construction contract and change orders if required with Advantage Reline Services, Inc., in an amount not to exceed $200,000, for the repair and rehabilitation of the 36-inch water main crossing Redwood Creek; determine that the proposed contract with Advantage Reline Services, Inc for the installation of a Primus Liner meets the requirements for a "specialty item" as set forth in Napa Municipal Code Section 2.91.050; and determine that the actions authorized by this item are exempt from CEQA.
Body
DISCUSSION:
The City of Napa water system provides potable water to 86,906 persons throughout City of Napa and unincorporated Napa County. On the western side of the city, potable water is transported from the Barwick Jamieson Treatment Plant through a 36-inch asbestos-cement (AC) transmission main to the City of Napa service area. On July 3, 2023, the City discovered a leak on the transmission main where it crosses Redwood Creek near Linda Vista Ave and Lone Oak Ave. This section of transmission main from Robinson Lane to West Pueblo Ave was subsequently isolated while a repair or replacement was assessed.
Staff assessed different options to repair or replace the transmission main including a pipe bridge, horizontal directional drilling, lining, and open trenching. The break in the transmission line is under the creek bed and difficult to access. Staff determined lining of the transmission main to be the least expensive and quickest to install. After extensive research, staff determined that a 20-inch diameter Primus multilayered polyethylene liner with Kevlar reinforcement could be pulled through the existing transmission main to make ...
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