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i <br /> i) n <br /> enviros® <br /> parts per billion (ppb) Benzene concentrations ranged from ND to 170 <br /> ppb A benzene concentration map is presented on Plate 2 <br /> Quarterly Sampling <br /> Monitoring Wells MW-1 through MW-10 were sampled and analyzed for Total <br /> Purgeable Petroleum Hydrocarbons quantified as gasoline (TPPH) according to <br /> EPA Method 8015 (Modified), and benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX), and methyl-tertiary-butyl-ether(MTBE) according to EPA Method 8020 <br /> Additionally, a duplicate sample and an equipment blank were prepared and <br /> analyzed for quality control purposes <br /> Field monitoring data and chemical analytical data are summarized in Table 1 <br /> Blaine's quarterly ground water monitoring report is presented in Appendix A <br /> Remediation System Operation <br /> A soil and ground water remediation system consisting of SVE is in operation at the <br /> site The SVE system has been operating since September 1992 and has been <br /> operating intermittently (pulsing) from September 1993 to present A summary of <br /> SVE system operational and analytical data is presented in Table 2 and on Plate 3 <br /> The analytical data indicate that hydrocarbon extraction rates have become <br /> . asymptotic (Plate 3) Therefore, the SVE system has extracted all of the petroleum <br /> hydrocarbons economically achievable by this remediation technique, and is <br /> presently on a pulsing schedule <br /> Quarterly monitoring, sampling, and reporting will continue on the established <br /> schedule <br /> 97375 2 <br />