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STATE OF CALIFORNIA GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL OARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> VtV 15 <br /> c5r R=�ht tw'k�CY,�. i, ial <br /> ui <br /> 20 November 1989 NOV 224 <br /> rel_14��1,ti <br /> Ms. Diane Hinson <br /> Supervising REHS <br /> San Joaquin County <br /> Department of Public Health Services w <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton CA 95201 <br /> FORMER TEXACO SERVICE STATION, 941 EAST- YOSEMITE AVENUE, MANTECA - <br /> CONTAMINATED SOIL EXCAVATION REPORT <br /> We have reviewed the 26 October 1989 report of contaminated soil <br /> excavation, prepared by Applied Geosystems for this site. The report <br /> includes the analytical results for verification samples obtained after <br /> aeration of the contaminated sail . <br /> Significant reductions in hydrocarbon levels were reported after the soil <br /> aeration treatment. Although the samples ere not analyzed by the most <br /> appropriate method available, we believe that the analytical results are <br /> valid and that there has been a significan reduction in the levels of <br /> hydrocarbon contamination. Therefore, backf lling the excavation with the <br /> treated soil should not pose any additional threat to the beneficial uses <br /> of this ground water. However, because hydrocarbons have been detected <br /> in ground water at this site, additional monitoring will be necessary to <br /> adequately assess the impacts to ground water from 'the previous discharges <br /> at this site. <br /> The operator should be requested to submit a comprehensive ground water <br /> monitoring plan for this site. This pian should include, but not be <br /> limited to, an additional ground water inoritoring well to be located near <br /> the former tank location, in the verified downgradient direction. In <br /> addition, quarterly sampling of all the on-site monitoring wells should <br /> be included in the monitoring plan. <br /> If you have any questions, please call me A (916) 361-5731. <br /> THOMAS D. PELTIER <br /> Engineering Geologist <br /> TDP/tdp <br />