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SNrFN <br />ENVIRONMENTAL TECHNOLOGIES CORPORATION <br />January 4, 1996 <br />94-326 <br />Ms. Mary Meays <br />San Joaquin County Public Health Services <br />Environmental Health Division <br />PO Box 388 <br />Stockton, CA 95201-0388 <br />Subject: Work plan for Further Delineation of Subsurface Petroleum Hydrocarbon <br />Contamination, Gardner Property, 26080 Thornton Road, Thornton, California, <br />Site Code 1864 <br />Dear Ms. Meays: <br />This letter report is being submitted by Smith Environmental Technologies Corporation on behalf <br />of Ms. Donna Gardner, to San Joaquin County Public Health Services Environmental Health <br />Division (PHS/EHD). This document serves to address comments to Smith Environmental's <br />October 24, 1995 Soil Excavation Report and to propose methodologies for further delineation of <br />subsurface petroleum hydrocarbon contamination at the above referenced site (Figure 1). This <br />work plan is being submitted in response to PHS/EHD correspondence dated November 15, <br />1995. <br />SITE BACKGROUND <br />On September 6, 1989, three underground gasoline storage tanks were removed at the project site <br />by Western Meter Service of Stockton, California. Soil samples were collected beneath each tank <br />and the associated piping. Soil samples collected from beneath two of the tanks contained <br />moderate to high levels of ethyl benzene and xylenes (1.2 to 70 parts per million [ppm]) as well as <br />total petroleum hydrocarbons as gasoline (TPHg), at 470-830 ppm. <br />Due to the presence of elevated concentrations of petroleum hydrocarbons in the tank pit soil <br />samples, further investigation was required by PHS/EHD. <br />In a two -phased approach beginning on November 1, 1990, RESNA Industries, Inc. (RESNA) <br />personnel advanced six soil borings (MW1-MW6) to depths ranging from 27 to 30 feet below <br />grade at the project site to accomplish the following: 1) define the lateral and vertical extent of <br />hydrocarbon impacted soils; 2) determine soil stratigraphy; and 3) install groundwater monitoring <br />wells within the uppermost aquifer in order to assess groundwater quality. The boring/well <br />150081\SXR-0995.DOC <br />1260 Graphics Drive - Modesto, CA 95351-1502 - (209) 579-2221 - Fax (209) 579-2225 <br />Engineering - Consulting - Remediation - Construction <br />