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01 May 2000 <br /> AGE-NC Project No 95-0121 <br /> 1 Page,4 of 7 =r <br /> ' between the October 1999 and January 2000 ground water momtonng events <br /> Ground water monitoring data collected in the area of wells MW-1 through MW-7 indicated that the <br /> ground water flow direction was generally toward the northeast-north at an average gradient of 0 01 <br /> ' ft/ft, or approximately 53 feet per mile (Figure 3) Ground water was approximately 10 to 16 feet ' <br /> above'the screen intervals ofMW-1 through MW-7 <br /> 4 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> A total of seven ground water samples were submitted to a DHS-certified laboratory in January <br /> 2000 TPH-g was detected in water samples collected from wells MW-1, MW-2, MW-3,MW-4 and <br /> MW-7 at concentrations ranging as high as 50,000 micrograms per liter (AZg/l) <br /> BTEX compounds were detected in ground water samples collected from wells MWA, MW-2, <br /> ' MW-3 and MW-4 at concentrations ranging as high as 10,000 /.Zg/l (benzene, MW-3) <br /> MTBE was detected in ground water samples collected from wells MW-2, MW-5 and MW-6 at <br /> concentrations ranging as high as 230,ug/l <br /> Analytical results of the ground water samples are summarized in Table 2 The laboratory reports <br /> ' (Castle Analytical Laboratory Reference No 2785) and chain-of-custody forms are presented in <br /> Appendix B <br /> 1 <br /> 4 3 - RESULTS OF VAPOR EXTRACTION PILOT TEST <br /> Between 15 February 2000 and 31 March 2000, the SVE and IAS remediation system was <br /> operational for 1,056 hours During the operational period, flow rates ranged from 18 to 30 standard <br /> cubic feet per minute (scfm) at differential pressures between 0 10 to, 0 30 inches of water, the <br /> induced vacuum stabilized at approximately 0 25 inches of water during this start-up period of the <br /> remediation system Hydrocarbon concentrations were measured at regular intervals at the SVE inlet <br /> ' Possibly because the SVE and IAS remediation system was in the start-up phase, no general trends <br /> were established from the PID field measurements Field measurements are summarized in Table <br /> 4 <br /> 44 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br /> 1 <br /> Soil-gas vapor samples were collected on 28 February 2000, on 08 March 2000 and on 29 March <br /> 2000 TPH-g was detected in soil-gas vapor samples collected from the SVE inlet at concentrations <br /> - Advanced GeoEnvironmcntal,Inc <br />