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• which were analyzed are Di-isopropyl ether,Ethanol,Ethyl tert-Butyl Ether,Methanol,Methyl tert-
<br /> Butyl Ether(MTBE), Tert-Amyl Methyl Ether, and Tert-Butanol Copies of the EMC Field Status
<br /> Reports are presented in Appendix A, and copies of the laboratory analytical reports are contained
<br /> 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 and benzene
<br /> were found in monitoring well TB-7, 11,000 ug/L and 852 ug/L, respectively The analytical
<br /> laboratory results with the highest groundwater concentration of MTBE was found in monitoring
<br /> well MW-5 (19,900 ug/L) The only other oxygenates with any detectable concentrations were TBA
<br /> in monitoring wells MW-5(2,520 ug/L)and TB-1 (102 ug/L),TAME in monitoring well MW-5 (3 8
<br /> ug/L), and DIPE in monitoring well MW-2 (1 1 ug/L)
<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-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, TB-6, MW-5, TB-9 (A,B)
<br /> and TB-12 (A,B) During this reporting period, the soil vapor extraction unit (VEU) operated
<br /> approximately 1,337 hours, and approximately 2,095 pounds of total petroleum hydrocarbons for
<br /> • gasoline (TPH-g) were removed this quarter (Table 2 and Appendix C) The system was non-
<br /> operational from May 23 through June 30,2000 for maintenance and replacement of a blower motor
<br /> Vapor samples were collected from the system inlet, outlet, and from seven selected site wells
<br /> (Figure 5) on April 18 and May 16, 2000 The samples were analyzed for TPH-g by EPA method
<br /> 8015,and BTEX/MTBE were analyzed by using EPA method 8020, MTBE was confirmed by EPA
<br /> method 8260 The effluent laboratory concentration results for April 19 and May 18, 2000 indicate
<br /> TPH-g, benzene, and MTBE to be below method detection limits A copy of the vapor well-head
<br /> laboratory analytical results, and copies of vapor inlet/outlet laboratory analytical results are
<br /> presented in Appendix D A historical summary of hydrocarbons removed by vapor extraction is
<br /> presented in Table 2 Field Status Reports are included in Appendix C
<br /> Thnfty will continue the current groundwater monitoring and sampling program, and operation of
<br /> the vapor extraction system
<br /> All interpretations expressed in this report are based upon review of data collected by EMC
<br /> ,��RED c;FQ
<br /> rar'
<br /> Reviewed by ��G' A %Gf�Bo
<br /> Q
<br /> 0�1 3• a
<br /> No 5497
<br /> and C Fnedrichsen, REAII Larry Higinbotham
<br /> Project Manager, MBA Registered Geologist#5497 OF C1A►-�F�Q
<br /> Senior Hydrogeologist
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