AWWA INF52161

The East Bay Municipal Utility District (District) supplies water and provides wastewater treatment for parts of Alameda and Contra Costa counties in California. Approximately 1.2 million people are served by the District's water system. The District has developed several long-term infrastructure plans to maintain the distribution system, with each plan focusing on a specific category of facility. In 1994, the Steel Tank Reservoir Rehabilitation Program was initiated to evaluate all steel tank reservoirs and develop specific upgrade projects. Historically, periodic rehabilitation has been considered the cost-effective approach to long-term maintenance of steel tank reservoirs. However the cost of tank re-coating has increased dramatically in recent years. In response, the District has more closely examined alternatives to rehabilitation when developing steel tank upgrade projects. In cases where both interior re-coating and significant structural upgrades are required, replacing a welded steel tank with a new tank can be a cost-effective solution. If a bolted steel tank can be utilized at the site, more substantial savings can be realized. This paper discusses the District's steel tank rehabilitation program. Includes table.