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I
<br /> 8260B The seven oxygenates which were analyzed are Di-isopropyl ether(DIPE), Ethanol, Ethyl
<br /> tert-Butyl Ether (ETBE), Methanol, Methyl tert-Butyl Ether (MTBE), Tert-Amyl Methyl Ether
<br /> (TAME), and Tert-Butanol (TBA) A summary of historical analytical sampling results for TPH-g,
<br /> BTEX, and MTBE are provided in Table 1, and oxygenates results are summarized in Table 3
<br /> Copies of the EMC Field Status Reports are presented in Appendix A, and copies of the laboratory
<br /> analytical 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, 21,300 ug/L, 6,370 ug/L, and 10,400 ug/L,
<br /> respectively All other oxygenates were below the laboratory detection limit, except for DIPE with
<br /> concentrations of 2 8 ug/L, I ug/L, and 16 ug/L in monitoring wells MW-2, MW-3R, and T13-7,
<br /> respectively
<br /> Remediation Status
<br /> On July 1, 1999, a Baker Furnace Thermal Oxidizer Unit was placed into operation with the hour
<br /> meter reading starting at 13,312 hours Presently, the remediation system is connected to soil vapor
<br /> extraction wells MW-2, MW-4, MW-5, TB-3, TB-4, TB-6, TB-7, TB-9 (A,B), TB-11 (A,B), and
<br /> TB-12 (A,B) A map showing the extraction well layout is shown as Figure 5 During this quarter
<br /> the only wells operating were TB-3, T134, TB-6, MW-5, TB-9(A,B) and TB-12 (A,B) During this
<br /> reporting period, the soil vapor extraction unit (VEU) operated approximately 144 hours (since
<br /> October 3, 2000), and approximately 11 pounds of TPH-g (since October 3, 2000) were removed
<br /> this quarter (Table 2 and Appendix C) The cumulative system total to date is 20,889 hours of
<br /> operation, and approximately 52,431 pounds of TPH-g removed The system was non-operational
<br /> from October 10, through December 31, 2000 for replacement of the pilot light blower motor(small
<br /> blower),malfunction of the extraction blower(big blower), and maintenance On October 24, 2000,
<br /> the small blower was replaced, and the big blower motor malfunctioned At this time, Thrifty is
<br /> waiting for a big blower motor replacement which was ordered from Grainger
<br /> Vapor samples were not collected this quarter Field Status Reports for the system are presented in
<br /> Appendix C
<br /> Thrifty will continue the current groundwater monitoring and sampling program, and resume
<br /> operation of the vapor extraction system when repairs to the extraction blower are completed All
<br /> interpretations expressed in this report are based upon review of data collected by E M C
<br /> Written by r�'�'°�4°�'a Reviewed by ��<ViAONAf
<br /> SIV Q�p C FRl�p��t�y,
<br /> No 2002
<br /> a mond C Friedrichsen, EII �� Larry Hi Fnboth
<br /> Project Manager, MBA ,, OR LJF aaa Registered Geologist
<br /> Senior Environmental Hydrogeolo�sL�'�
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