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STATE OF CALIFORNIA V <br /> PETE WILSON Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE A <br /> SACRAMENTO, CA 95827-3098 <br /> PHONE: (916) 361-5600 <br /> FAX: (916) 361-5686 <br /> 17 September 1991 i <br /> Ms. Mary Meays <br /> San Joaquin County' Public Health Services <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> MOBIL, 500 EAST GRANT LINE ROAD, TRACY, SAN JOAQUIN COUNTY <br /> I have reviewed the file for this site and the report "Supplemental Site <br /> Investigation" , dated .27 June 1991,. prepared by .Alton Geoscience. I also ! <br /> received your recent letter to .Mobil , dated 5 September 1991, and I concur <br /> with all comments and requests for submittals.- <br /> However, <br /> ubmittals.However, our file is missing some information which may or may not be <br /> available in other documents: <br /> 1 . The historic depth to ground water (DTW) was not found in our -file. The <br /> current DTW is 'about 10.5 feet. A shallower DTW might explain the soil I <br /> contamination at 6.5 feet across Grant Line Road. <br /> 2. Our file has no soil sample results from the side walls and base of the <br /> excavation. This -information is useful for determining the <br /> contamination remaining in soils off-s-ite.and under Grant Line Road. <br /> If this information is available. in .your files, please forward or have Alton <br /> forward a copy to us. ' If this information is not available, it will be <br /> necessary for Mobil to investigate the historic DTW and "off-site .soil <br /> contamination", which you already informed them to do, in your letter. <br /> If you 'have any questions, please call me at (916) 361-5726. <br /> ELIZA H A. THAYER <br /> Associa a Engineer <br /> ,1 <br /> i <br />