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r <br /> 13 November 2000 <br /> AGE-NC Project No. 98-0481 <br /> Page 3of10 <br /> J <br /> On 07 March 2000, the preliminary site assessment was continued using a hollow-stem auger drill <br /> rig to advance soil borings SB-3 and SB-4. AGE continued site assessment activities as required by <br /> the San Joaquin County PHS-EHD by letter dated 15 November 1999. Soil boring SB-3 was <br /> advanced to 23 feet bsg and SB-4 was advanced to 60 feet bsg. A total of three soil samples were <br /> submitted to a DHS-certified laboratory(McCampbell Analytical Inc.)for analysis. TPH-g, TPH-d, <br /> BTEX compounds, and the suite of five fuel oxygenating compounds were not detected above the <br /> laboratory reporting limits in any of the soil samples submitted for analysis (Tables 3 and 4). The <br /> vertical extent of petroleum hydrocarbon- and fuel oxygenate-impacted soil has been defined in the <br /> area north of the former eastern and western dispenser island. <br /> r <br /> A grab ground water sample was collected from soil boring SB-4 and was submitted to a <br /> DHS-certified laboratory for analysis. None of the analytes were detected above the laboratory <br /> reporting limits in the grab ground water sample collected (Tables 3 and 4). Ground water was not <br /> impacted by petroleum hydrocarbons or fuel oxygenated compounds in the area north of the former <br /> fuel dispenser area. <br /> The lateral and vertical extent of petroleum hydrocarbon- and fuel oxygenate-impacted soil and <br /> ground water has not been defined south of the former western fuel dispenser island,product piping, <br /> and former waste oil UST <br /> J 3.0. SCOPE OF WORK <br /> Based on the results of the previous assessments and the UST-removal sampling, petroleum <br /> J hydrocarbon-impacted soil at the site appears to be limited to the area south of the former western <br /> fuel dispenser island,product piping, and former waste oil UST. Therefore,no additional assessment <br /> activities are proposed for the former location of the three fuel USTs. <br /> The site assessment activities covered by this work plan include the investigation of the area that <br /> formerly contained the west fuel dispenser,the waste oil UST, and the recent product piping rupture. <br /> J The investigation of the extent of petroleum hydrocarbons at the site will consist of the following <br /> tasks: <br /> u <br /> • Permitting and pre-field work activities; <br /> • Advancement of soil borings; <br /> • Soil and grab ground water sample collection and analysis; <br /> • Monitoring well installation and development; <br /> r <br /> • Ground water sample collection and analysis; and <br /> Advanced GeoEnvironmental,Inc. <br /> ..r <br />