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California Regional Water Quality Control Board Q <br /> Central Valley Region, <br /> Robert Schneider, Chair <br /> Terry Tamnen Fresno Branch Office Arnold Schwarzenegger <br /> mi <br /> Secretary for Internet Address: htt //www.swreb.ca. ov/-rw cb5 2 /7 Governor <br /> Environmental 1685 E Street,Fresno,California 93706-2020 <br /> I r' \V/ �l <br /> Protection Phone(559)445-5116•FAX(559)445-5910 LLL��� LLL"`--��� 1J U <br /> FEB 2 7 2004 <br /> TO: Shelton R. Gray FROM: C. Dean Hubbard ENVIRONIV1E[V HEALTH <br /> PERMIT/SERVICES <br /> t <br /> DATE: 24 February 2004 SIGNATURE: <br /> SUBJECT: Former TAOC Pump Station, 880 Beechnut, Tracy, San Joaquin Co. <br /> I have reviewed the 16 December 2003 Soil Investigation and Groundwater Monitoring Report, Former <br /> TAOC Pump Station, Tracy, San Joaquin County, prepared for ChevronTexaco by Geomatrix Consultants, <br /> Inc. (Geomatrix). Historically, this site has also been referred to as 880 Beechnut (Renown). Additionally, <br /> I reviewed previous soil and groundwater investigation reports conducted by Geomatrix and others from <br /> 1997 to 2002. The purpose of the investigations was to determine the lateral and vertical extent of impacts <br /> to soil and groundwater caused by petroleum hydrocarbon leaks from abandoned crude oil pipelines (Old <br /> Valley Pipeline, OVP). <br /> The OVP and pump station was formerly operated by predecessors of Chevron and Texaco (now <br /> ChevronTexaco), from the early 1900s to the mid-1960s. The OVP and pump station were used to heat <br /> and transfer crude oil from Kern County to refineries in the Bay Area. Crude oil was diverted into the <br /> pump station facilities and heated to reduce viscosity to facilitate movement through the pipeline. The <br /> former aboveground structures have been removed and the site is undeveloped. <br /> BACKGROUND <br /> The approximately 7-acre site, located within a residential area of Tracy,jointly owned by ChevronTexaco <br /> and Union Pacific Railroad, is currently undeveloped and surrounded by fencing. In March 1985, <br /> petroleum hydrocarbons were observed during construction activities and further development was halted <br /> until environmental investigations could be conducted. Numerous stockpiles of petroleum hydrocarbon- <br /> impacted soil are present throughout the site. Similar conditions are present at the related adjacent site to <br /> the west (990 Beechnut Avenue, part of the former pump station, but now separated by a city street) being <br /> addressed separately by ChevronTexaco. <br /> mil <br /> Between 1986 and 2002, over 180 samples were collected from numerous soil borings and trenches. The <br /> majority of the samples were analyzed for oil and grease and only seven of those were tested for BTEX <br /> compounds. Thirty-five soil samples were tested for PAHs (polyaromatic hydrocarbons), however, due <br /> to elevated petroleum hydrocarbon concentration and dilution factors, the majority of the PAH detection <br /> limits exceeded the currently acceptable human health-based screening criteria. Eleven soil samples were <br /> analyzed for metals and found to be within background levels. <br /> California Environmental Protection Agency <br /> Cps Recycled Paper <br />