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STATE OF CAI IFORNIA - Fnvirnnmantal Prnl — AAPney PFTF WII SON rnvnrnnr <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGIONf ( t' �� N Tit --` <br /> 3443 Routier Road, Suite A � R NP'itI• �t 1 � <br /> Sacramento, CA 95827-3098 {" <br /> PHONE: (916) 255-3000 ,t <br /> FAX: (916) 255-3015cv <br /> i`vl <br /> 17 November 1993 <br /> Mr. Mark Buckon <br /> Chevron Research and Technology Company <br /> P. O. Box 4054 <br /> Richmond, CA 94804-0054 <br /> GROUND WATER SAMPLE RESULTS, CHEVRON TRACY ORCHARD SITE, GRANT <br /> LINE AND CORRAL HOLLOW ROADS, TRACY, SAN JOAQUIN COUNTY <br /> Enclosed are laboratory results from split samples 1 collected during the groundwater sampling <br /> conducted on 5 October 1993 at the above referenced site. I split samples from two wells, MW-7 <br /> and MW-8. These samples were tested.for EPA 601 and 602 compounds, total petroleum <br /> hydrocarbons as gasoline (TPH-G) and TPH as diesel (TPH-D). Both monitoring wells contained <br /> no detectable TPH-D but had elevated amounts of TPH-G and its components. Benzene was <br /> µ <br /> measured at 5,100 g/1 in MW-8 and at'23 ,700 µg/l in MW-7. As is evident, the ground water at <br /> this site is highly contaminated with gasoline and its components. <br /> On 29 October 1993, we received the results of your 5 October 1993 ground water sampling event <br /> and the 1991 RESNA subsurface investigation report which was not in our files. Thank you for this <br /> submittal. You stated in your letter that monitoring wells MW-3, MW-10 and;MW-11 were either <br /> damaged or destroyed. If these wells cannot be redeveloped or repaired, they must be properly <br /> abandoned and new monitoring wells drilled to-replace them. <br /> Based on this recent round of sampling and the 1991 RESNA report, the contamination in the <br /> shallow ground water is fairly well defined. Therefore, by 20 December 1993, please submit a <br /> remedial action plan and schedule to cleanup the shallow ground water zone, and a work plan and <br /> schedule to test deeper ground water zones for possible migration of the gasoline contamination. <br /> If you have any questions, please contact me at (916) 255-3054. <br /> DAVID E. JENKINS <br /> Associate Engineering Geologist <br /> DEJ:njs <br /> Enclosure <br /> cc: Mr. Douglas Christian, Chevron Pipe Line Co., Bakersfield <br /> Ms. Margaret_Lagorio;,San Joaquin County Public Health Services, Stockton <br /> Mr. Bill Vizza, Director, Department of Public Works, Tracy <br /> i <br />