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en virus® <br />• <br /> • Ground water samples from Well RW-2 contained 0 53 ppb benzene All other <br /> wells sampled were ND for benzene A benzene concentration map is presented on <br /> Plate 2 <br /> Quarterly Sampling <br /> Wells MW-1 through MW-5, RW-1, RW-2, VEW-1, VEW-3, and VEW-4 were sampled <br /> and analyzed for Total Purgeable Petroleum Hydrocarbons quantitated as gasoline (TPPH) <br /> according to EPA Method 8015 (Modified), and benzene, toluene, ethylbenzene, and <br /> xylenes (BTEX) and methyl-tertiary-butyl-ether (MTBE) according to EPA Method 8020 <br /> Ground water samples from Wells MW-3, MW-4, and VEW-3 were also analyzed for <br /> MTBE according to EPA Method 8260 Additionally, a duplicate sample and an equipment <br /> blank were prepared and analyzed for quality control purposes <br /> Field monitoring data and chemical analytical data are summarized in Table 1 Blaine's <br /> Quarterly Ground Water Monitoring Report is presented ;n Appendix A <br /> Remediation System Operation <br /> The most recent soil vapor extraction system which utilized activated carbon for airstream <br /> abatement was re-activated on April 18, 1996 and operated until August 21, 1996 when it <br /> was shut down with approval from the S]CPHS in a letter dated August 14, 1996 Table 2 <br /> presents operational and analytical data for the operation of the most recent soil vapor <br /> extraction system Plate 3 presents plots of cumulative hydrocarbon mass removed and <br /> hydrocarbon removal rate for the most recent soil vapor extraction system As shown on <br /> Plate 3, hydrocarbon removal rates had become asymptotic <br /> i r <br /> 96369 2 <br />