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ACTON a MICKELSON a van DAM, INC. <br /> Consulting Scientists, Engineers, and Geologists <br /> 5090 Robert J. Mathews Parkway, #4 (916) 939-7550 <br /> El Dorado Hills, California 95762 Fax (916) 939-7570 <br /> July .30, 1993 <br /> Mr. Kenneth Earnest <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 19042.01 <br /> Subject: Executive Summary--Soil Management and Remediation Work Plan <br /> Beacon Station #610, 3300 Waterloo Road, Stockton, California <br /> Dear Mr. Earnest: <br /> Acton • Mickelson • van Dam, Inc. (AMV), has been authorized by Ultramar Inc. (Ultramar), <br /> to prepare a soil management plan for handling of soil generated during the removal of three <br /> existing underground storage tanks and possible overexcavation of soil if conditions warrant. <br /> A copy of the soil management plan is enclosed. , Excavated soil will be stockpiled on site, <br /> sampled, and transported to Ultramar's refinery facility in Hanford, California, or an appropriate <br /> landfill. <br /> Previous work at the subject site has included advancement of nine soil borings on site. Of the <br /> 24 soil samples collected from 9 borings, 7 soil samples contained measurable amounts of <br /> petroleum hydrocarbon constituents, benzene, toluene, ethylbenzene, or xylenes (BTEX), total <br /> petroleum hydrocarbons as gasoline, or total extractable hydrocarbons (TEH). None of the soil <br /> samples contained over 0.47 parts per million (ppm) of any of th; analytes (BTEX). None of <br /> the soil samples collected from the site contained measurable amounts of benzene. One soil <br /> sample, collected 12 feet below grade in soil boring B-4, contained measurable amounts of TEH <br /> (42 mg/kg). <br /> Soil samples will be collected from beneath product lines and tanks as specified in the <br /> Tri-Regional. Guidelines and analyzed by the methods outlined in the Tri-Regional Guidelines. <br /> All soil stockpiled on site will be covered with visqueen and secured. <br /> San Joaquin County will be property notified prior to commencement of work and kept informed <br /> as new information (i.e., soil sample results) is obtained. It is our understanding that Ultramar <br /> anticipates performing removal of the tanks in the third quarter of 1993. <br /> Lptoo9 A <br />