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ALTON n <br /> r .. <br /> `' z GEOSCIENCE __.. <br /> THE RESULTS TEAM <br /> SEP 1 7 '1 <br /> September 16, 1991 ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Ms. Laurie A. Cotulla <br /> San Joaquin County Public Health Services <br />` Environmental Health Division <br /> Site Code 1968 <br /> P.O. 2009 <br /> Stockton, California 95201 30-0136 <br /> Subject: Response to San Joaquin County`s Letter Regarding <br /> Supplemental Site Investigation Report <br /> Former Mobil Oil Bulk Plant <br /> 500 East Grantline Road, Tracy, California <br /> Dear Ms. Cotulla: <br /> This response was requested by San Joaquin County Public <br /> Health Services (SJCPHS) . Alton Geoscience, on behalf of <br /> Mobil Oil Corporation, herewith submits a response to the <br /> letter received from SJCPHS, dated September 5, 1991, <br /> regarding the supplemental site investigation report for the <br /> former Mobil Oil Bulk Plant, 500 East Grantline Road, Tracy, <br /> California. <br /> All comments contained in the SJCPHS letter are addressed <br /> f <br />' below. <br /> Comment Number 1: <br /> Mobil Oil Corporation contracted Balch Petroleum to carry out <br /> the excavation, transportation, and disposal of the petroleum <br /> hydrocarbon-affected soil at the site. Copies of the waste <br /> manifestation are included. <br /> Comment Number 2: <br /> Analytical reports and chain of custodies for the qualitative <br /> water survey were enclosed in the supplemental site <br /> investigation report (See appendix G) . Additional copies are <br /> enclosed. <br /> NComment Number 3 : <br /> Analytical reports and chain of custodies for Soil Samples <br /> B-2;,,B-3, B-4, and B-9 are enclosed. <br /> k CommentNumber 4 : <br /> The soil sample collected at 6.0 to 6 .5 feet below grade in <br /> Boring 8-2 contained 180 ppm of TPH-D. This probably <br /> reflects the "depth to the former capillary fringe zone during <br /> the drought conditions (i.e. shallower ground water table) . <br /> 1000 Burnett Avenue,Suite 140 <br /> Concord,California 94520 ~ <br /> (415)682-1582•FAX(415)682-8921 t <br />