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The West Basin Municipal Water District (WBMWD) and Chevron, USA entered into apublic/private partnership in 1993 to optimize the use of recycled water at theChevron El Segundo Refinery. Deliveries of recycled water to Chevron coolingtowers began in June 1995, only three months after the West Basin Water RecyclingPlant (WBWRP) went on-line. In early 1999, WBMWD, Chevron and the City of ElSegundo signed a recycled water service agreement to expand the use of recycledwater at Chevron for use in their high pressure and low pressure boilers. Theboilers and cooling towers combined account for 80 percent of water usage atChevron. The last remianing large-scale use of fresh water at Chevron is notdirectly associated with the refining process. Due to historic contamination ofthe 200-ft./Old Dune Sand (ODS) aquifer underlying the Chevron Refinery, Chevronhas been operating a Liquid Hydrocarbon (LHC) Recovery System under a 1988Cleanup and Abatement Order (CAO) issued by the California Regional Water QualityBoard - Los Angeles (RWQCB). Initial investigation in 1985 revealed up to 20 ft.of LHC present on top of the ODS aquifer. During 10 years of system operation,the floating LHC has been reduced to 12 feet. The LHC recovery system is expectedto operate for another 20 years. Large volumes of water are injected into the ODSto aid in the downgradient extraction of LHC. The regulatory process ofconverting the injection system to recycled water began in 1995. It isanticipated that the first delivery of recycled water for groundwater injectionat the LHC Recovery System will occur in September 1999. This paper describes thesteps taken by all the stakeholders to navigate this project through the windingterrain of the regulatory process. Includes tables, figures.

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Edition: Vol. - No. Published: 09/01/1999 Number of Pages: 13File Size: 1 file , 330 KB