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— = <br /> Geological Audit Services, Inc. <br /> Im AM 1803 W. March Lane, Suite A•Stockton, CA 95207•(209) 956-0264•FAX(209)956-0700 <br /> ONLAW <br /> ow <br /> �- 14 August 1992 <br /> (GeoAudit CV 43D6-1.8) <br /> I <br /> Mr. Arthur Wyatt <br /> 6290 Chesapeake Circle <br /> Stockton, CA 95219 . ; <br /> Subject: Proposal for site Assessment <br /> ARCO Xini .Mart <br /> 4511 Pacific Avenue, Stockton, California <br /> Dear Mr. Wyatt: <br /> In accordance with your request, we have prepared this proposal to <br /> perform the site assessment activities outlined in the addendum to <br /> our Soil Contamination Workplan. This proposal covers the cost of <br /> drilling six borings, which we believe is the minimum number that <br /> will be needed in order to adequately assess soil conditions at <br /> this site. ! <br /> The borings will be drilled to "a maximum depth of 30 feet and soil <br /> samples will be collected at 5-foot intervals, starting Lat 10 feet <br /> below grade. However, if - any boring(s) - exhibit evidence of <br /> contamination at 30 feet during field screening, drilling will be <br /> continued until groundwater is encountered (estimated to be 60 feet <br /> or less) . A maximum of 3 borings will be drilled to groundwater and <br /> converted to 2-inch-diameter monitoring wells to determine whether ! <br /> groundwater contamination is present. At most sites with known <br /> groundwater contamination, San Joaquin County Environmental Health <br /> Division (EHD) and the Central Valley Regional Water Quality <br /> Control Board (RWQCB) require a minimum of three monitoring wells. <br /> U, - I <br /> `, We estimate that between 18 and 30 soil samples will be submitted <br />_ « for laboratory analysis. Selection of samples will be based on i <br /> field evidence of the presence or absence of contamination. As <br /> _- specified in the workplan, all samples will be analyzed for BTE&X <br /> and for Total Petroleum Hydrocarbons in the gasoline range. Samples <br /> from B-4 through B--6 will also be analyzed for Total Petroleum <br /> Hydrocarbons in the diesel range. Water samples, if needed, will be <br /> analyzed for the same compounds. <br /> Following completion of the field work and laboratory analysis, we <br /> will prepare a report of ou:• findings 'for submittal to San Joaquin <br /> County EHD 'and RWQCB,' as required by state guidelines. <br /> The-. estimated cost of the above work, including submittal of <br /> required drilling permits, should not exceed $ 16,500. Should fewer <br /> than three groundwater monitoring wells be installed, the drilling „ <br /> time and the number of groundwater and soil samples will be less, <br /> Environmental Services•Hydrogeology•Geotechnical Services <br />