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STATE OF CALIFORNIA PETE WILSON. Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION g <br /> 3443 ROUTIER ROAD, SUITE A <br /> SACRAMENTO, CA 95827-3098 <br /> PHONE: (916) 361-5600 q <br /> FAX: (916) 361-5686 _y j <br /> OCT 2 2 R"^1 <br /> ENVIRONMENTAL HEALTH <br /> 18 October 1991 <br /> [ ERM P.SERVICES <br /> Assemblyman Dean F. Andal <br /> 31 East Channel St. , Suite 306 <br /> Stockton, CA 95202 <br /> SOUZA REALTY, QUALITY MEATS, 340 WEST GRANT LINE ROAD, TRACY, SAN JOAQUIN <br /> COUNTY <br /> At the request of your staff member, Kelly Smith, I have reviewed our file for <br /> this site. The depth to ground water at this site is about 8 feet. When <br /> ground water is this close to the surface, the likelihood of soil <br /> contamination, at even low levels, impacting the ground water is high and <br /> cleanup as required. A ground water sample collected from the pit during <br /> removal of the underground tank was contaminated with petroleum hydrocarbons <br /> 310 ppm Total Hydrocarbons. A soil sample collected from boring SB-1 at a <br /> depth of 4.5 feet, about 30 feet from the former tank, contained 30 ppb <br /> toluene. Both the contamination of soil , close to the water table, and the <br /> ground water in the pit, indicates additional ground water contamination. <br /> Three wells were installed, but none downgradient of the former tank. Even <br /> though no ground water contamination was found in the wells, a downgradient <br /> well was necessary and a fourth well was installed. Two water samples were <br /> collected from the new well and both contained non-detectable levels of <br /> contamination. The County has requested additional work, including one more <br /> round of sampling from the new well , measurement of the ground water <br /> elevations in all four wells to confirm the gradient, and an explanation of <br /> the soil contamination in the boring. Once this work has been completed and <br /> County staff have reviewed the results, a determination on additional <br /> monitoring, soil remediation, and/or closure may be made. <br /> If you have any questions, please call me at (916) 361-5726. <br /> � <br /> ELIZ�A H A. THAYER <br /> Associate Engineer <br /> cc: Ms. Eleanor Ratliff, San Joaquin County Public Health Services, Stockton <br /> Mr. Don Maughan, State Water Resources Control Board, Sacramento <br /> Mr. Michael Souza, Souza Realty, Tracy <br />