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Y ' <br /> r � <br /> • <br /> ® A ground water extraction system was in operation at the site from March 2, 1993 <br /> through September 5, 1995 Several soil vapor extraction systems were in <br /> operation at the site The current vapor extraction system was temporarily shut <br /> down on February 29, 1996 to allow ground water conditions to equilibrate prior to <br /> sampling The following table summarizes remediation performed to date <br /> Total Purgeable Petroleum Hydrocarbons Removed <br /> ( ounds) <br /> LI UID PHASE VAPOR PHASE CUMULATIVE <br /> 37 3263 3300 <br /> First Quarter Sampling <br /> Monitoring Wells RW-1, RW-2, and MW-1 through MW-5 were sampled and analyzed for <br /> Total Purgeable Petroleum Hydrocarbons (TPPH) according to EPA Method 8015 <br /> (Modified) and benzene, toluene, ethylbenzene and xylenes (BTEX) according to EPA <br /> Method 8020 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 i 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 <br /> A report documenting confirmation boring drilling will be submitted during the second <br /> quarter of 1996 <br /> 96369 2 <br />