To: Honorable Mayor and Members of City Council
From: Joy Eldredge, Utilities Director
Prepared By: Chris Jones, Senior Civil Engineer
TITLE:
Title
Emergency Declaration for 36-inch Asbestos Cement Transmission Main Replacement
LABEL
RECOMMENDED ACTION:
Recommendation
Adopt a resolution (1) determining there is a need to continue the emergency action to execute and implement contracts for the construction to replace up to 11,000 linear feet of 36-inch asbestos cement transmission main; (2) approving a transfer in the amount of $11,000,000 from water CIP reserve fund balance account 531-35102 to CIP project account 53160139-63WT25UTER as documented in Council budget amendment No. 115; and (3) determining that the actions authorized by this resolution 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. The 36-inch AC transmission main was installed in 1968 and is only 56 years old. Typically, an AC main would have a 100-year service life.
The main is critical to the City's ability to convey water throughout the City, without the 36-inch transmission main, the City relies on the 24-inch steel transmission main on the east side of the City and smaller local distribution mains. Any further disruptions at the same time as a 36-inch AC transmission main break can cause major impacts and restrict the ability to provide water for large portions of the City.
Since 2020, the City has had nine main breaks on the 36-inch AC transmission main. Four of these breaks have occurred in the last six months. Previously the majority of main breaks were on the south side of Napa in open fields near the Napa Sanitation District. More recently the breaks have been...
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