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Ms Mary Meays awn <br /> November 29, 1995 (9347-0020) - - <br /> Findings and Conclusions <br /> The following are the findings and conclusions of this and previous assessments <br /> • BTEX and TPH-G were not detected above reported detection limits in soil <br /> sample collected at 46 feet bg from GE01, 46 and 49 feet bg from GE03, and 49 <br /> feet bg from GE04 However, the laboratory did not analyze the soil sample <br /> collected from GEO1 at 46 feet bg within the allowable EPA mandated hold time <br /> • TPH-G and benzene were detected at up to 7,000 and 10 ppm, respectively, in the <br /> soil samples collected from boring GE02 TPH-G and benzene were detected at <br /> 3,000 and 10 ppm in the soil sample collected at 49 feet bg from GE02, however, <br /> this sample appears to have been collected from the capillary fringe TPH-G was <br /> detected at up to 12,000 ppm in the soil samples collected from well VEW-2 in <br /> July 1989 <br /> • Based on a review of the laboratory results, it appears that the extent of the <br /> adsorbed-phase petroleum hydrocarbons is limited to the area beneath the former <br /> UST basin <br /> • Comparison of the analytical results from the soil samples collected above the <br /> capillary fringe from well VEW-2 in July 1989 and boring GE02 in September <br /> 1995, indicate that the adsorbed-phase petroleum hydrocarbons have decreased <br /> over 40 percent <br /> • The apparent petroleum hydrocarbon attenuation may be attributed to the <br /> combined effect of the extended soil vapor extraction test and natural <br /> biodegradation,volatilization, dispersion, and diffusion processes in the subsurface <br /> soil <br /> • Benzene was detected at up to 9 8 ppm in the water samples collected from GEO1 <br /> through GE04 on September 21 and 22, 1995 Benzene was detected at up to 12 <br /> ppm in the water samples collected from wells MW-2 and MW-3 on October 5, <br /> 1995 Benzene was not detected above reported detection limits in the water <br /> sample collected from MW-1 on October 5, 1995 <br /> • Review of the laboratory results indicates that the extent of the dissolved-phase <br /> petr um hydrocarbons in ground water is defined to the northwest, hydraulically <br /> grade nt of the former UST basin <br /> r <br /> 93470200 ARP -4- <br />