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� 7 <br /> • <br /> en vrros® <br /> (ppb) Benzene concentrations ranged from ND to 750 ppb MTBE 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), 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 summanzed in Table 1 Blaine's <br /> 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 site <br /> The SVE system has been operating since September 1992 and has been operating <br /> intermittently (pulsing) from September 1993 to present A summary of SVE system <br /> operational and analytical data is presented in Table 2 The analytical reports for second <br /> quarter 1996 SVE system operation are presented in Appendix B The analytical data <br /> indicate that hydrocarbon extraction rates have become asymptotic (Plate 3) Therefore, the <br /> SVE system has extracted all of the petroleum hydrocarbons economically achievable by <br /> this remediation technique, and is presently on a pulsing schedule <br /> Quarterly monitoring, sampling, and reporting will continue on the established schedule <br /> If you have any questions regarding the contents of this document, please call <br /> Sincerely, <br /> Enviros, Inc <br /> Matthew E Donohue <br /> Project Engineer �Q�LOFESS1pyA� <br /> �\ LU,11 <br /> w <br /> Fyc <br /> N rn <br /> GC C] •-Y 70 <br /> Diane M Lundquisii <br /> NO C46725 � <br /> Senior Engineer <br /> C46725 fjar�oF�Vk <br /> C� <br /> 96375 2 <br />