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q <br /> STATE OF CALIFORNIA ` GEORGE DEUKMEJIAN, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD- <br /> CENTRAL VALLEY REGION y <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO, CA 95827-3098 _. <br /> 18 June 1990 ■ ■ ECE ' VE <br /> JUN 1 9 11C210 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Ms . Diane Hinson <br /> Supervising REHS <br /> San Joaquin County <br /> Public Health Services <br /> Environmental Health Division <br /> P . O . Box 2009 <br /> Stockton CA 95201 <br /> GASCO SERVICE STATION , 749 EAST CHARTER WAY , STOCKTON - SITE ASSESSMENT <br /> REPORT <br /> We have reviewed the 9 February 1990 Site Assessment Report prepared for <br /> this site by California Geophysical Group , The investigation included an <br /> electromagnetic induction survey , and the installation and sampling of <br /> three ground water monitoring wells , Petroleum hydrocarbons were detected <br /> in ground water samples from all three monitoring wells . <br /> The operator should now be directed to develop a work plan for conducting <br /> an investigation to determine the extent of the impacts to soil and ground <br /> water on - site and off- site . Based on the levels of contamination and <br /> reported fluctuations in ground water gradient at this site , the work plan <br /> should include proposed soil boring and monitoring well locations to <br /> define the full extent of hydrocarbon contamination in soil and ground <br /> water . The work plan should also include a proposed monitoring schedule <br /> for the existing monitoring wells and the new wells to be installed . <br /> If you have any questions , please call me at ( 916 ) 361 - 5731 . <br /> THOMAS D . PELTIER <br /> Associate Engineering Geologist <br /> TDP / tdp <br />