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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 r= r-3 - i�"-�" August 24, 1992 S E R 0 1 1992 ENVIRONMENTAL HEALTH Mr. Randall K. Stephenson Ultramar Inc 525 West Third Street Hanford, California 93230 ULT 12.02 Subject: Soil Management and Remediation Work Plan--Beacon Station #474 3440 East Main Street, Stockton, California Dear Mr. Stephenson: • 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 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 plan 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. Three soil borings were advanced at the site in March 1991 (Figure 2). Nine soil samples were collected and analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX) and total petroleum hydrocarbons as gasoline (TPHg). Seven soil samples contained measurable amounts .... . ....: of any of these constituents. No soil sample contained over 0.13 parts per million (ppm) of any of these constituents (BTEX). Analysis of a soil sample collected at 45.5 feet below grade from soil boring SB-2 indicated.the presence of TPHg at 6.3 ppm. This is the only soil sample that . contained measurable amounts of TPHg. Only,one sample contained measurable amounts of benzene (0.022 ppm), a sample collected 35.5 feet below grade in soil boring SB-2.