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,r. <br /> wf ' EDMUND G. BROWN JR. <br /> `�:. GOVEgNOq <br /> C 4 L I f O R N 1 A 5EL ETlARY FOgEW DRIOUEZ <br /> WaterBoards ENVIgONMENT AL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> TO: Case File <br /> FROM: Kristi Shelton, P.E. <br /> Water Resources Control Engineer <br /> SITE CLEANUP SECTION <br /> DATE: 6 July 2012 (amended 25 April 2014) <br /> SUBJECT: NO FURTHER ACTION REQUIRED, FORMER TOSCO BULK TERMINAL <br /> #10013, 3505 NAVY DRIVE, STOCKTON, SAN JOAQUIN COUNTY <br /> This memo has been prepared to serve only as a brief summary of significant activities <br /> conducted on behalf of ConocoPhillips for the petroleum hydrocarbon release at 3505 Navy <br /> Drive in Stockton (Site), and to document that No Further Action is required for the Site. This <br /> memo does not constitute a complete summary of all site activities. For a complete case <br /> history, the case files at our office and San Joaquin County Environmental Health Department <br /> should be reviewed. All record owners of fee title located within 200 feet of the site's identified <br /> hydrocarbon plume were notified of the request for closure and given 30 days to respond. No <br /> comments were received. <br /> BACKGROUND <br /> The 4.3-acre Site is on the northeastern portion of Rough and Ready Island in Stockton and has <br /> been a bulk storage facility since 1938. It is adjacent to the Lyons Club Golf Course, Navy <br /> Drive, and vacant land. The Stockton Deep Water Channel is about 500 feet north-northeast of <br /> the Site. Tosco Refining Company (Tosco is now ConocoPhillips) purchased the Site in 1994 <br /> and subsequently transferred ownership to ST Services in October 1998. Valero (currently <br /> named as NuStar Energy) acquired the Site in 2005, and is the current Site operator. Since <br /> 1998, the Site has been used solely for diesel storage. The facility currently consists of six <br /> aboveground storage tanks (AGTs), two underground storage tanks (USTs), a fuel loading rack, <br /> two metal buildings, and a small enclosure that previously contained a groundwater extraction <br /> and treatment system (GWETS). The Site plan is shown on the attached Figure 1. <br /> SOIL IMPACTS <br /> In April 1987, during replacement of the 285-gallon vapor knock out tank with the existing <br /> 550-gallon fiberglass knock out tank, ConocoPhillips noted hydrocarbon sheen in the <br /> excavation. ConocoPhillips subsequently installed three groundwater monitoring wells and <br /> collected soil samples at five and ten feet below ground surface (bgs). Total petroleum <br /> hydrocarbons as gasoline (TPHg) was detected in soil samples from all three borings at a <br /> maximum concentration of 25 milligrams per kilogram (mg/kg). TPH as diesel (TPHd) was not <br /> detected in any of the soil samples. <br /> KARL E. LONGLEY SCD, P.E., CHAIR I PAMELA C. CREEDON, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive 8200,Rancho Cordova,CA 95670 1 www.waterboards.ca.gov/centralvalley <br /> Ca RECYCLED PAPER <br />