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PRELIMINARY INVESTIGATION AND EVALUATION REPORT <br /> Pacific Gas <br /> ' 2068 Mariposa Road <br /> Stockton, California <br /> 1.0 INTRODUCTION <br /> ' In accordance with a request from our client, Mr. Manuel Sanchez, <br /> Geological Audit Services, Inc. (GeoAudit) has performed a soil <br /> investigation at the property located at 2088 Mariposa Road, <br /> t Stockton, California (the site) . This report presents the methods <br /> and findings of the investigation. The location of the site is <br /> illustrated in Figure 1. A plan of the site with the location of <br /> the soil borings is illustrated in Figure 2 . <br /> 2. 0 BACKGROUND <br /> ' The site is located in a flat industrial/commercial area of <br /> southeastern Stockton. The property was operated as a gasoline <br /> M station until 1990. The underground storage tank facility consisted <br /> of four fuel tanks, one waste oil tank, three fueling islands and <br /> their appurtenant piping. A building and canopy are present on-site <br /> ' but are currently vacant. <br /> In May of 1990, five underground storage tanks (UST's) were removed <br /> from the site by Falcon Energy Associates (FEA) . One 5, 000 gallon <br /> ' leaded regular tank, one 2 , 000 gallon diesel tank, one 6, 000 gallon <br /> unleaded tank, one 2, 000 gallon unleaded tank and one 550 gallon <br /> waste oil tank were removed. The four fuel tanks were located at <br /> ' the southeast corner of the property (tank pit 1) . The waste oil <br /> tank was located on the northwest portion of the property (tank pit <br /> 2 , see Figure 2) . <br /> ' Soil samples collected from beneath the UST' s indicated that <br /> contamination was present and an unauthorized release of <br /> hydrocarbons had occurred. Total petroleum hydrocarbons (TPH) as <br /> ' gasoline were detected at levels as high as 6200 parts per million <br /> (ppm) . Volatile aromatics (BTE&X) were detected at levels as high <br /> as 458 ppm. Soil sample analyses are included in the "Soil Sampling <br /> ' Report - Underground Storage Tanks" dated 1 May 1990, prepared by <br /> Water Work for FEA and submitted to the San Joaquin County Public <br /> Health Services Environmental Health Division (PHS/EHD) . GeoAudit <br /> was subsequently retained to assess the lateral and vertical extent <br /> ' of contamination at the site. <br /> ' 1 <br />