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STATE OF CALIFORNIA - Environmental Pn on Agency PETE WILSON, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION p <br /> 3443 Routier Road, Suite A ENVIRONMENT <br /> AL HEALTh <br /> Sacramento, CA 95827-3098 7 .1I i' � <br /> PHONE: (916) 255-3000 ,EI?V!CE <br /> FAX: (916) 255-3015 904 DEC —7 PM 1: <br /> 27 <br /> 5 December 1994 <br /> Mr. Ernest Lee <br /> Pacific Gas and Electric Company <br /> 375 North Wiget Lane, Suite 250 <br /> Walnut Creek, CA 94598-2412 <br /> PACIFIC GAS AND ELECTRIC COMPANY, LATHROP GAS DEHYDRATOR STATION, <br /> SAN JOAQUIN COUNTY <br /> We have reviewed the August 1993 site assessment report for PG&E's Lathrop Gas Dehydrator <br /> Station entitled Report of Subsurface Investigation, PG&E's Lathrop Gas Dehydrator Station, San <br /> Joaquin County, California, prepared by your consultant Technical and Ecological Services. This <br /> report was originally prepared for the San Joaquin County Public Health Services Department, and <br /> was submitted to us on 6 September 1994. The attached memo contains our review of and <br /> comments on this report. <br /> The report shows that the soil and ground water at the site contain various petroleum hydrocarbons, <br /> including TPH as kerosene, TPH as gasoline, and benzene. Laterally, the highest concentrations <br /> were near the reboiler unit, while vertically the highest concentrations were just above the water <br /> table at about nine feet below ground surface. Additional investigation is needed to determine the <br /> lateral and vertical extent of soil and ground water contamination. Since a water sample from the <br /> discharge line of the reboiler unit contained glycol compounds, ground water samples need to be <br /> tested for these compounds, and for volatile and semi-volatile organic constituents. By 13 January <br /> 1994, please submit a work plan and time schedule to determine the extent of soil and ground water <br /> contamination and to implement appropriate interim remedial measures. <br /> If you have any qu �` � you may call me at (916) 255-3141. <br /> ri <br /> o_H�N MOO Y <br /> Water Resou ontrol Engineer <br /> JDM:jdm/lsb <br /> Enclosure <br /> cc: Ms. Linda Turkette, San Joaquin County Department of Public Health Services Stockton <br />