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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Re - <br /> Robert Schneider,Chair <br /> Fresno Office <br /> Terry Tamminen 1685 E Street,Fresno,California 93706 Arnold Schwarzenegger <br /> Secretaryfor Phone(559)445-5116•FAX(559)445-5910 Governor <br /> Environmental Internet Address: http://www.swreb.ca.gov/—rwgcb5 <br /> Protection <br /> 16 August 2004 <br /> M. Scott Mansholt <br /> Chevron Environmental Management Company <br /> Property Management <br /> 6001 Bollinger Canyon Road <br /> P. O. Box 6012 <br /> San Ramon, CA 94583-0712 <br /> REVIEW OF SECOND QUARTER 2004, GROUNDWATER SAMPLING AND MONITORING <br /> REPORT, FORMER TAOC TRACY PUMP STATION, TRACY, SAN JOAQUIN COUNTY <br /> We have reviewed the Second Quarter 2004 Groundwater Sampling and Monitoring Report, Former <br /> TAOC Tracy Pump Station, Tracy, San Joaquin County, dated 29 July 2004, prepared for Chevron <br /> Environmental Management Company by Science Applications International Corporation (SAIC). The <br /> property occupies the eastern portion of the former TAOC Tracy Pump Station located along Beechnut <br /> Avenue, west of Tracy Boulevard. <br /> The report provides the 13 May 2004 quarterly groundwater monitoring analytical results related to leaks <br /> from the former pump station facility and the Old Valley Pipeline formerly located on the property. <br /> There are two onsite monitoring wells, two offsite (downb ad.ie-lit), and one offsite (upgradient) <br /> monitoring wells associated with this project; the two onsite wells contain floating product and were not <br /> sampled. Petroleum hydrocarbon constituents were not detected in the upgradient well; total petroleum <br /> hydrocarbons as gasoline (TPH-g),benzene, toluene, ethylbenzene, and xylenes (BTEX), and <br /> polynuclear aromatic hydrocarbons (PAHs) were not detected in the two upgradient wells. However, <br /> TPH as diesel (TPH-d) was detected in the two downgradient wells at concentrations of 610 µg/L(Well <br /> E) and 210 µg/L (Well F). These results are consistent with previous quarterly monitoring reports. <br /> Separate phase floating crude oil has been removed for the previous five quarters from the two wells <br /> containing product. This quarterly event, the wells contained approximately 5.6 to 5.75 feet of floating <br /> product. <br /> California Environmental Protection Agency <br /> .d <br /> rr� Recycled Paper <br />