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sl 1! <br /> en viros® <br /> • Ground water samples collected from Wells MW-1 through MW-10 contained <br /> TPPH concentrations ranging from ND to 37,000 ppb Benzene concentrations <br /> ranged from ND to 180 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 Purgeable <br /> Petroleum Hydrocarbons quantified as gasoline (TPPH) according to EPA Method 8015 <br /> (Modified), and benzene, toluene, ethylbenzene, and xylenes (BTEX), and methyl-tertiary- <br /> butyl-ether(MTBE) according to EPA Method 8020 Additionally, a duplicate sample and <br /> an equipment 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 in Appendix A <br /> Remediation System Status <br /> The SVE system has been idle during 1997 due a rise in the water table A response to the <br /> April 10, 1997 PHS-EHD request for remediation system status was included with the <br /> Quarterly Monitoring Report- Second Quarter 1997 dated June 30, 1997 <br /> Based upon the stability of the hydrocarbon plume, the rise in the water table, and the <br /> asymptotic hydrocarbon extraction rates exhibited prior to the rise in the water table, <br /> Enviros requested permission to end SVE system operation in the Quarterly Monitoring <br /> Report - Second Quarter 1997 Natural attenuation processes will continue to remediate <br /> residual concentrations of petroleum hydrocarbons in soil and ground water SVE system <br /> operational data are presented ;n Table 2 and Plate 3 Unless directed otherwise by the <br /> PHS-EHD, Enviros will consider SVE system operation complete <br /> Quarterly monitoring, sampling, and reporting will continue on the established schedule to <br /> monitor plume stability and natural attenuation <br /> 97375 2 <br />