Laserfiche WebLink
05 September 2002 <br /> AGE-NC Project No. 01-0887 <br /> Page 3 of 9 <br /> at concentrations as high as 24 mg/kg(benzene), 120 mg/kg(toluene), 51 mg/kg(ethylbenzene) and <br /> 290 mg/kg(xylenes) from sample P2-5. MTBE was not detected in the three analyzed soil samples. <br /> jn 0r\kXA <br /> TPH-g was detectednat concentrations as high as 180,000 micrograms per liter (µg/l) from <br /> sample P2. BTEX compounds were detected at concentrations as high as 27,000 µg/1 (benzene), <br /> 29,000 µg/1(toluene), 3,700 µg/l(ethylbenzene) and 22,000 µg/l(xylenes) from sample P2. MTBE <br /> was detected in all three groundwater samples by EPA Method 8260B at concentrations as high as <br /> 1,300 µg/1 (P-2). Results of the investigation are presented in the AGE-prepared Preliminary <br /> Investigation and Evalution Report, dated 21 lune 2002. <br /> 2.4. GROUND WATER DEPTH AND FLOW DIRECTION <br /> Based on information obtained during the May 2002 site assessment activities, ground water depth <br /> beneath the site is approximately 4 to 6 feet bsg. <br /> The map Lines of Equal Elevation of Groundwater, Fall 1999 (FCD&WCD) depicts the regional <br /> ground water flow direction towards the northeast. <br /> 3.0. SCOPE OF WORK <br /> Based upon analytical results of previous investigations, an unauthorized release of petroleum <br /> hydrocarbons has occurred. The EHD is requiring an investigation to determine the lateral and <br /> vertical extent of hydrocarbon-impacted soil and ground water. <br /> Four soil borings will be advanced to 19 feet bsg on-site to collect soil samples and install ground <br /> water monitoring wells. The proposed locations of the soil borings are presented on Figure 2. As <br /> shown on Figure 2, soil boring/monitoring well locations are proposed east-northeast (down <br /> gradient) of the former gasoline UST area, northwest of the dispenser area, south of the former <br /> product piping and adjacent to soil boring P-2, located near the former product piping. The scope <br /> of work for ground water monitoring well installation activities will include of the following tasks: <br /> • Permitting and pre-field work activities; <br /> • Soil sample collection and analysis; <br /> • Monitoring well installation and development; <br /> Advanced GcoEnvironmenwl,Inc. <br />