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15 June 2004 <br /> AGE-NC Project No 95-0142 <br /> Page 10 of 12 <br /> detected at 8,700 µg/1, the highest BTEX compounds were detected benzene at 880 µg/l, <br /> toluene at 510p.g/l, ethyl benzene at 23 µg/l, and xylenes at 540 gg/l MTBE was detected <br /> at 21 µgd <br /> Analytical results of pump and treat water samples are summarized in Table 4, laboratory reports <br /> are provided in Appendix F <br /> 3 3 2 Laboratory Analysis of Effluent Ground Water Samples <br /> TPH-g/d BTEX compounds and MTBE were not detected in the effluent ground water treatment <br /> samples analyzed Analytical results of pump and treat water samples are summarized in Table 4, <br /> laboratory reports are provided in Appendix F <br /> 3 4 GROUND WATER MASS-VOLUME REMOVAL CALCULATIONS <br /> During 2004 an estimated 18 7 lbs ofTPH-g or an estimated 3 2 lbs of benzene were extracted from <br /> ground water The 2004 volume to mass to wight calculations from the ground water pump-and-treat <br /> system are presented in Appendix G The results of the laboratory analysis are summarized in <br /> Table 4 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the data collected during the remediation system installation and start-up penord and <br /> previous assessment and monitoring, AGE concludes <br /> • Results from previous assessment investigations indicated that the highest concentrations of <br /> petroleum hydrocarbons in soil were near the former UST area TK1-90, at depth intervals <br /> of 10 to 40 feet bsg(VW-1) Lower concentrations of hydrocarbons were detected in bonngs <br /> around the southeast portion of the site (VW-3) <br /> • The SVE network was installed within the highest petroleum hydrocarbon-impacted soil and <br /> ground water Ongoing operation of the SVE system should result in reductions of <br /> hydrocarbon-impact to soil and expectantly to ground water <br /> • Hydrocarbons were detected in soil-vapor samples collected at the SVE unit at <br /> concentrations considered to be acceptable for successful on-going SVE remediation and the <br /> SVE unit operated over the entire quarter A total of 111 gallons of gasoline as vapor were <br /> removed over the first two months of operation <br /> Advanced GeoEnvironmental,Inc <br />