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PROBLEM ASSESSMENT REPORT <br /> INTERIM REMEDIAL PLAN <br />' GARDNER PROPERTY <br /> 26080 THORNTON ROAD <br />' THORNTON, CALIFORNIA <br />' 1.0 INTRODUCTION <br /> On behalf of Ms Donna Sartini-Gardner, Trustee of the Donna Sartim-Gardner Living Trust, Smith <br />' Technology Corporation conducted a subsurface site investigation to further delineate and assess <br /> subsurface petroleum hydrocarbon affected soil and groundwater at the site This work was <br /> conducted in accordance with correspondence from the San Joaquin County Public Health <br /> Services, Environmental Health Division (PHS/EHD) dated November 14, 1995 The site is <br /> located at 26080 Thornton Road, in Thornton, California (Figure 1) This report summarizes the <br />' details of field procedures used dunng this phase of the investigation, presents cumulative soil and <br /> groundwater analytical data compiled for the site, and presents recommendations for remedial <br /> alternatives for media affected by petroleum hydrocarbons <br /> 2.0 BACKGROUND <br /> 2.1 Site Location <br /> The project site is located at 2600 Thornton Road, Thornton, California The site location is <br /> shown on Figure 1 The site is located in a residential/commercial area in downtown Thornton <br /> Immediately north of the project site's property boundary is a municipal well compound <br /> (Thornton Municipal Well No 2) and a U S Post Office building(Figure 2) <br />' 2.2 Previous Work <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 ethylbenzene and xylenes (1 2 to 70 parts per million [ppm]) as well as <br /> total petroleum hydrocarbons as gasoline (TPHg) at 470 to 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 San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS/EHD) <br />' In a two-phased approach beginning on November 1, 1990, RESNA Industries, Inc personnel <br /> advanced six soil borings (MW1 through MW6) to depths ranging from 27 to 30 feet below <br /> ground surface (bgs) at the project site to accomplish the following 1) define the lateral and <br /> vertical extent of hydrocarbon impacted soils, 2) determine soil stratigraphy, and 3) install <br /> w 194326Vrports\sumrptdoc 1 <br /> 1 � <br /> SWTH <br />