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ACTON • MICKELSON • van DAM, INC. Consulting Scientists, Engineers, and Geologists 5090 Robert J. Mathews Parkway, #4 (916) 939-7550 El Dorado Hills, California 95762 Fax (916) 939-7570 July 30, 1993 Mr. Kenneth Earnest Ultramar Inc. 525 West Third Street Hanford, California 93230 19042.01 Subject: Soil Management and Remediation Work Plan--Beacon Station #610 3300 Waterloo Road, Stockton, California Dear Mr. Earnest: Acton • Mickelson • van Dam, Inc. (AMV), has been authorized by Ultramar Inc. (Ultramar), to prepare a soil management plan for handling of soil generated during the removal and replacement of three existing underground storage tanks and possible overexcavation, if soil containing petroleum hydrocarbons is present at the subject site (Figure 1). Records indicate that the existing underground storage tanks are 10,000-gallon capacity tanks. The tanks have contained regular leaded, regular unleaded, and premium unleaded gasoline. The purpose of this letter is to provide a pian for the management of the soil generated during the tank removal and possible overexcavation, and also describes the sampling procedures to be utilized when collecting soil samples from the areas of the tank excavation, the product distribution lines, and soil stockpiles. These proposed sampling and soil-handling procedures are being submitted for review and approval by San Joaquin County, Environmental Health Division, Public Health Services (San Joaquin County), prior to initiation of the work at the site to minimize delays once the work has begun. A total of nine soil borings have been advanced at the site; six soil borings in March 1987 and three in March 1993 (Figure 2). Twenty-four soil samples have been collected and analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX) and total petroleum hydrocarbons as gasoline (TPHg) or total extractable hydrocarbons (TEH). Seven soil samples contained measurable amounts of one or more of these constituents (TEX). No samples contained measurable amounts of benzene. No soil sample contained over 0.47 milligrams per kilogram (mg/kg) of any of these constituents (TEX). Analysis of a soil sample collected 12 feet below t�Os.m�