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<br /> �► Ether(ETBE), Methanol, Methyl tert-Butyl Ether(MTBE), Tert-Amyl Methyl Ether(TAME), and
<br /> ' Tert-Butanol (TBA) A summary of historical analytical sampling results for TPH-g, BTEX, and
<br /> MTBE are provided in Table 1, and oxygenates results are summarized in Table 3 Copies of the
<br /> EMC Field Status Reports are presented in Appendix A, and copies of the laboratory analytical
<br /> reports are contained in Appendix B
<br /> The TPH-g, benzene, and MTBE isoconcentration maps are contoured in Figures 2,3, and 4 The
<br /> ' analytical laboratory results with the highest groundwater concentrations of TPH-g, benzene, and
<br /> MTBE were found in monitoring well MW-5, 99,100 ug/L, 5,350 ug/L,
<br /> and 25,100 ug/L,
<br /> respectively All other oxygenates were below the laboratory detection limit
<br /> ' Rem
<br /> ediation Statics
<br /> ' On July 1, 1999, a Baker Furnace Thermal Oxidizer Unit was placed into operation
<br /> with
<br /> the hour
<br /> meter reacting starting at 13,312 hours Presently, the remediation system is connected t so 1 vapor
<br /> extraction wells MW-4, MW-5, TB-3, TB-4, TB-6, TB-7, TB-9 (A,B), TB-11 (A,B), and TB-12
<br /> (A,B) During this quarter the only wells operating were TB-3, TB-4, T13-6,MW-5, TB-9 (A,B)and
<br /> TB-12 (A,B) During this reporting period, the soil vapor extraction unit E
<br /> ' approximately 1,252 hours (since July 3 2000), and a operated
<br /> approximately 62 5 pounds of TPH-g (since
<br /> July 3, 2000) were removed this quarter(Table 2 and Appendix C) The cumulative system total
<br /> to date is 7,255 hours of operation, and approximately 52,394 pounds of TPH-g removed The
<br /> system was non-operational from July 1 through July 3, and on August 8, 2000 for replacement of
<br /> a blower motor, and maintenance
<br /> Vapor samples were collected from the system inlet, outlet, and from seven selected site wells
<br /> (Figure 5) on July 12-, August 9, and September 12, 2000 The samples were analyzed for TPH-g
<br /> ' by EPA method 8015M, and BTEX/MTBE by EPA method 8021B The effluent laboratory
<br /> concentration results for July 21, August 9, and September12, 2000 indicate TPH-g, benzene, and
<br /> MTBE to be below method detection limits A copy of the vapor well-head laboratory analytical
<br /> ' results, and copies of vapor inlet/outlet Iaboratory analytical results are presented in Appendix D
<br /> A historical summary of hydrocarbons removed by vapor extraction is presented in Table 2 Field
<br /> Status Reports are included in Appendix C
<br /> Thrifty will continue the current groundwater monitoringand r
<br /> the vapor extraction system sampling P g p ogram, and operation of
<br /> All interpretations expressed in this report are based upon pori review of data collected by EMC
<br /> �aEo�F
<br /> Written by Reviewed by �r�►1(�1MB�O����
<br /> 1 E
<br /> No Ark
<br /> ay and C Fnednchsen, REAM Larry Higinboth
<br /> Project Manager, MBA Registered Geologist #5497 SOF CAO'
<br /> Senior Environmental Hydrogeologist
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