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STATE OF CALIFORNIA-Environmental Protection-ency `� PETE WILSON,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTrF2QL B ►,I <br /> CENTRAL VALLEY REGION ` ' ` '` a <br /> 'f <br /> 3443 Routier Road,Suite ASacramento,CA <br /> -- <br /> PHONE:(91 6)255-3000 098 96 AUG 2 <br /> FAX:(916)255-3015 <br /> oiwit+ <br /> 22 August 1996 <br /> Ms. Katie Hower <br /> Chevron Pipeline Company <br /> P.O. Box 5059 <br /> San Ramon, CA 94583 <br /> SOIL AND GROUND WA'T'ER CONTAMINATION, CHEVRON PIPELINE COMPANY, <br /> CORRAL HOLLOW AND GRANT LINE ROADS, TRACY, SAN JOAQUIN COUNTY <br /> I have reviewed your 8 August 1996 letter which responds to my 18 July letter concerning sampling <br /> and remediation of contaminated soils and ground water at the Chevron pipeline leak site at Corral <br /> Hollow and Grant Line Roads. Your letter adequately addresses most of my concerns although <br /> there are still a few issues which need to be resolved. <br /> Because the ground water gradient is known, at times, to be in an easterly direction, it is still my <br /> opinion at this time that it would be appropriate to place a monitoring well due east of the leak site. <br /> Regarding the vertical extent, the grab ground water sample from MW-14 showed 80 ppb of <br /> gasoline in a deeper zone, although the well was screened in the shallow zone. Your letter states <br /> that ASW-1 (a deeper zone well) and MW-14, were sampled in July 1996 during the latest ground <br /> water sampling event(third quarter). The monitoring report will be submitted by 20 September <br /> 1996. Following my review of that report, we will make a decision regarding the need.for <br /> additional wells both east of the leak site and in deeper parts of the aquifer. <br /> The attached draft monitoring and reporting program (MRP) is for your review and comment. By <br /> 6 September 1996, please provide any comments you may have regarding the MRP. Your letter <br /> states that a remedial action plan (RAP)will be developed after your evaluation of the third quarter <br /> ground water data. Therefore, by 18 October 1996, please submit the RAP. <br /> If you have any questions, you may call me at(916) 255-3077. <br /> JOEL M. WEISS <br /> Engineering Geologist <br /> JMW.jmw/lsb <br /> Attachment <br /> cc: San Joaquin County Department of Public Health Services, Stockton <br /> Geomatrix Consultants, San Francisco <br />