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' 04 November 2002 <br /> . AGE-NC Project No 00-0764 <br /> ' Page 4 of 5 <br /> Ground water was encountered at a depth of 30 feet bsg during drilling <br /> 32 HYDROCARBON-IMPACTED SOIL <br /> ' Three soil were samples analyzed for hydrocarbons and fuel additives <br /> p Y <br /> ' TPH-g was detected at a concentration of 29 milligrams per kilogram (mg/kg) in the soil <br /> sample from boring MW-3 at a depth of 25 feet bsg <br /> ' Ethylbenzene and total xylene were detected in the same soil sample (MW3-25) at <br /> concentrations of 0 11 mg/kg and 0 44 mg/kg, respectively <br /> • Fuel additives were not detected in any of the soil samples analyzed <br /> ' Low concentrations ofn-propylbenzene, 1,3,5-tnmethylbenzene, 1,2,4-trimethylbenzene and <br /> naphthalene was detected in soil sample MW3-25, at a maximum concentration of <br /> ' 0 16 mg/kg(1,2,4-tnmethylbenzene) <br /> Laboratory results of soil samples analyzed for petroleum hydrocarbons are summarized in Tables 1 <br /> and 2 The laboratory reports (CalTech Laboratory ID 0208-073-01 to -03), quality assurance and <br /> quality control (QA/QC) reports and chains-of-custody are included in Appendix D <br /> 1 <br /> 3 3 GROUND WATER ELEVATION AND FLOW DIRECTION <br /> ' During well development, depth to ground water at the site ranged from 28 93 feet to 30 35 feet <br /> below the monitoring wells casing tops The ground water elevations at the site ranged from <br /> ' 17 69 feet to 17 85 feet below mean sea level(msl),in the shallow ground water wells Ground water <br /> data is included on Table 3 <br /> ' The ground water flow direction was calculated from the well elevation data The ground water was <br /> inferred to flow radially inward, from a southerly direction at the eastern edge of the site to a <br /> southeasterly direction in the western portion of the site,the ground water gradient ranged between <br /> ' 0 01 ft/ft near the eastern edge to 0 003 ft/ft in the western portion Figure 3 illustrates the contoured <br /> ground water elevations as measured on 23 August 2002 <br /> ' 4.0. SUMMARY AND CONCLUSIONS <br /> ' Based on the data collected from the site, AGE finds <br /> • Ground water occurred at approximately 29 feet bsg during well development on <br /> Advanced GeoEnvironmental,Inc <br />