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Till <br /> i <br /> A <br /> ALTON <br /> GEOSCIENCE <br /> THE RESULTS TEAMJP i <br /> 0V <br /> Ig <br /> November 26, 1991 DEC 2w9 <br /> N.VI€OINIVIENTAL HEALTH <br /> Ms. Laurie A. Cotulla. PEI MIT1SERVICES <br /> E San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 Site Code 1968 <br /> Stockton, California 95201 30-0136 <br /> Subject: Response to San Joaquin County's Letter Regarding <br /> Problem Assessment Report <br /> Former Mobil Oil Bulk Plant <br /> 500 East Grantline Road, Tracy., California JI <br /> Dear Ms . Cotulla: <br /> i <br /> In response to your letter dated November 8, 1991, to Mr. <br /> Steve Pao, we discussed the comments regarding the Problem <br /> Assessment Report with Ms. Mary Meays as you suggested. As <br /> per our telephone conversation with Ms. Meays on. November 22, <br /> 1991, on behalf of Mobil Oil Corporation, Alton Geoscience <br /> will perform the following tasks prior to submittal of a <br /> Final Remediation Plan for the above referenced site. <br /> 1 . Obtain information on sewer line (trenching depth and <br /> location) and any dewatering activities at the adjacent <br /> property, Leprino Foods. <br /> 2 . Obtain information on utility lines (trenching depth) <br /> on East Grantline Road. <br /> 3. Install additional soil borings and collect soil <br /> samples in the vicinity of Monitoring Well AW-6, to <br /> further .investigate absorbed-phase hydrocarbon <br /> constituents in soil. <br /> is <br /> 4 . Iriscall.a recovery well in the immediate vicinity of M <br /> Soil Boring B-7, where high concentrations of dissolved <br /> hydrocarbons were detected. <br /> 5 . Implement a periodic pump out of groundwater from <br /> Monitoring Well AW-3 and the proposed recovery well. <br /> 6 . Submit a work plan prior to commencement of the above <br /> tasks . <br /> Please note we submitted a work plan in March 1990, prior to <br /> excavation. Our work plan was approved and no sidewall <br /> sampling was required. Also note, we attempted to collect <br /> soil and water samples from- the median strip of East <br /> Grantline Road on April 30, 1991. However, the drilling on <br /> 1000 Burnett Avenue,Suite 140 <br /> Concord,Caiiiornia 94520 <br /> (415)682-1582•FAX(415)682-8921 <br />