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uj:CjFiGE DEUKMEJIAN. Coedrnof <br /> STATE Of GA.J+;ORNIA -- <br /> CA -.FORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 9449 ROUT1ER ROAD <br /> SACRAMENTO,CA 85827.3088 <br /> 20 November 1989 <br /> Ms. Diane Hinson <br /> Supervising RENS <br /> San Joaquin County <br /> Department of Public Health Services <br /> Environmental Health Division <br /> P.O. Sox 2009 <br /> Stockton CA 95201 <br /> FORMER TEXACO SERVICE STATION, 941 EASE )OSEMITE AVENUE, KANTECA <br /> CONTAMINATED 50).L EXCAVATION REPORT <br /> We have reviewed the 26 October :989 report of contaminated soil <br /> excavation, prepared by Applied Ceosystems for this site. The report <br /> includes the analytical results for verification samples obtained after <br /> aeration of the contaminated soil . <br /> Significant reductions in hydrocarbon levels were reported after- the soil <br /> aeration treatment. Although the samples w re not analyzed by the most <br /> appropriate method available; we believe tha the analytical results are <br /> valid and that there has been a significant reduction in the levels of <br /> hydrocarbon contamination. Therefore, backfilling 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 plan should include, but not be <br /> limited to, an additional ground water' monitoring 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 mea (916) 361-5731 . <br /> THOMAS D. PLLT1ER <br /> Engineering Geologist <br /> TDP/tdp <br />