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t <br /> n <br /> STATE OF CALIFORNIA <br /> GEORGE OEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROLBOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> 9 March 1990 <br /> it � <br /> 1p^ <br /> � <br /> Z1y hQyy�i ` .•1''I <br /> I 1AP 1 2 1 S2 0 <br /> Ms. Diane HinsonI ��� IRONMENTAL i TALTH <br /> Supervising REHS PERMIT/SERVICES <br /> San Joaquin County <br /> Department of Public Health Services <br /> Environmental Health Division <br /> P:0. Box 2009 <br /> Stockton CA 95201 <br /> FORMER TEXACO SERVICE STATION, 941 EAST YOSEMITE AVENUE, MANTECA - <br /> QUARTERLY GROUND WATER MONITORING REPORT <br /> We have reviewed the 24 January 1990 Quarterly Ground Water Monitoring <br /> Report prepared for this site by Applied Geos stems. The report includes <br /> the analytical results for the first quartor of a one-year quarterly <br /> ground water monitoring program, as recommen ed by Applied Geosystems. <br /> We have previously commented on this proposal by letter, dated 20 November <br /> 1989, and we recommended that the responsible party be requested to <br /> conduct additional investigations including installation of an additional <br /> ground water monitoring well near the former tank location, in the <br /> verified downgradient direction. <br /> We have no record of the responsible party' response to this request. <br /> Although the levels of petroleum hydrocarbonlIs detected in the existing <br /> monitoring wells (3 to 4 parts per billio> benzene in MW--2) are not <br /> extremely high, these results indicate that g ound water beneath the site <br /> has been impacted by discharges of petroleum hydrocarbons.. Based on our <br /> review of the available information, the existing ground water monitoring <br /> wells are not sufficient to adequately deternine impact to ground water <br /> beneath the site. Therefore, additional investigation will be necessary <br /> to determine whether ground water remedia ion will be necessary to <br /> adequately address the petroleum hydrocarbon ollution of ground water at <br /> this site. <br /> If you have any questions, please call me at (916) ..361-5731 . <br /> THOMAS D. PELTIER <br /> Engineering Geologist <br /> TDP/tdp <br /> I <br /> r? M <br />