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r � <br /> en viros® <br /> ® All wells sampled were ND for TPPH and BTEX compounds A benzene <br /> concentration map is presented on Plate 2 <br /> Quarterly Sampling <br /> Monitoring Wells RW-1, RW-2, and MW-1 through MW-5 were sampled and analyzed for <br /> Total Purgeable Petroleum Hydrocarbons quantitated as gasoline (TPPH) according to EPA <br /> Method 8015 (Modified), and Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) and <br /> Methyl-Tertiary-Butyl-Ether(MTBE) according to EPA Method 8020 Additionally, a <br /> duplicate sample and an equipment blank were prepared and analyzed for quality control <br /> purposes <br /> Field momtonng 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 Operation <br /> As agreed upon during the February 2, 1996 meeting between Shell and the San Joaquin <br /> County Environmental Health Division, the ground water extraction system was <br /> permanently shut down, the sewer discharge permit canceled, and the pumps removed <br /> from the ground water extraction wells The soil vapor extraction system was temporarily <br /> shut down on February 29, 1996 to allow ground water conditions to equilibrate prior to <br /> sampling The soil vapor extraction system was re-activated on April 18, 1996 Ground <br />• water oxygenation consisting of air bubblers continues in Wells RW-1 and RW-2 and <br /> Wells MW-1 through MW-4 Table 2 presents operational and analytical data for the <br /> operation of the current soil vapor extraction system which utilizes activated carbon for <br /> airstream abatement Plate 3 presents plots of cumulative hydrocarbon mass extracted and <br /> hydrocarbon extraction rate for the current soil vapor extraction system Vapor extraction <br /> system analytical data for the second quarter of 1996 are presented in Appendix B <br /> A report documenting confirmation boring drilling will be submitted during the second <br /> quarter of 1996 along with a request to shut down the soil vapor extraction system <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 pfESSrp, <br /> t�OQR yq! <br /> � ���\ t.U,yopGFyy <br /> Q j/ <br /> c5 `Q' u <br /> Diane M Lund q t, PE <br /> Senior Engineer NO C46725 k3 <br /> C46725 sT CIVOL <br /> �Tf 4F CAL�F�Q� <br /> 96369 2 <br />