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,•1 California Regional Water Quality Control Board "= ' Central Valley Region 6 . Robert Schneider, Chair Terry Tarruninen Fresno Branch Office Arnold Schwarzenegger Secretary far Internet Address: http://www.swrcb.ca.gov/-rwgcb5 ��L�L/"nor Environmental 1685 E Street,Fresno,California 93706-2020 11 ll I�U Protection Phone(559)445-5116•FAX(559)445-5910 MAR 0 3 2004 TO: Shelton R. Gray FROM: C. Dean Hubbard ENVIRONMENT ENT I HEEALTH S DATE: 2 March 2004 SIGNATURE:— 4 SUBJECT: Former TAOC Pump Station, 990 Beechnut, Tracy, San Joaquin Co. I have reviewed the 13 January 2004 Soil Investigation Report, 990 Beechnut Avenue, Tracy, San Joaquin County, prepared for ChevronTexaco by Geomatrix Consultants, Inc. (Geomatrix). This site was formerly associated with the Former TAOC Tracy Pump Station (880 Beechnut), located east of this site. Additionally, I reviewed previous soil and groundwater investigation reports conducted by Geomatrix from 1997 to 2001. The purpose of the investigations was to determine the lateral and vertical extent of impacts to soil and groundwater caused by petroleum hydrocarbon leaks from abandoned crude oil pipelines (Old Valley Pipeline, OVP) and the TAOC Tracy pump station. The OVP and pump station were formerly operated by predecessors of Chevron and Texaco (now ChevronTexaco), from the early 1900s to the mid-1960s, to heat and transfer crude oil from Kern County to refineries in the Bay Area. Crude oil was diverted into the pump station facilities and heated to reduce viscosity to facilitate movement through the pipeline. Buried pipelines previously crossing the north and south portions of the site have reportedly been removed. BACKGROUND The approximately 3-acre site, located within a residential area of Tracy, and owned by ChevronTexaco, is currently undeveloped and surrounded by fencing. In March 1985, petroleum hydrocarbons were observed at the site during construction activities and further development was halted until environmental investigations could be conducted. One stockpile of petroleum hydrocarbon-impacted soil is present near the center of the site. Similar conditions present at the related adjacent site to the east (Former TAOC Pump Station, Tracy, 880 Beechnut Avenue) are being addressed separately by ChevronTexaco. S Qil Between 1979 and 2001, approximately 46 samples were collected from 22 different locations and submitted for analysis. According to the reports, residual petroleum hydrocarbons are present in surficial soils throughout the site to a depth of approximately 15-feet and some areas were slightly deeper. The majority of the sampling and analysis has been conducted in the upper 20-feet (maximum depth of historical borings). California Environmental Protection Agency Ca* Recycled Paper