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Method 8020 Groundwater collected from well VW-1 was further analyzed to confirm the presence <br /> or absence of MTBE in groundwater following EPA Test Method 8260 The laboratory reports and <br /> chain of custody documentation are presented in Appendix B <br /> ' Analytical Results <br /> ' TPHg was detected in wells MW-9, MW-13, MW-14, MW-16, MW-24, MW-25, MW-26 and VW-1 <br /> at concentrations ranging from 60 to 6,300 µg/l TPHg was not detected In downgradlent well MW- <br /> 11, however, TPHg was detected in downgradient well MW-26 at a concentration of 100 µg/l TPHd <br /> was detected in wells MW-9, MW-11, MW-12, MW-13, MW-14 and VW-1 at concentrations <br /> ranging from 63 to 170 µg/l TPHd was detected in downgradient well MW-I 1 at a concentration of <br /> 64 µg/l <br /> Benzene was detected in each of the wells sampled,with the exception of wells MW-1 1 and MW-12, <br /> at concentrations ranging from 1 2 to 2,300 �ig/l MTBE was detected in wells MW-9, MW-13, <br /> ' MW-14, MW-26 and VW-1 at concentrations ranging from 0 8 to 43 µg/l MTBE was not detected <br /> in well VW-1 when analyzed by EPA Test Method 8260 The absence of detectable MTBE using <br /> EPA Test Method 8260 Indicates that non-MTBE compounds were quantified by EPA Test Method <br /> ' 1020 <br /> TPHg, TPHd, benzene and MTBE concentrations are depicted on Figure 3 A summary of the <br /> analytical laboratory test results Is presented on Table 1 Laboratory reports and chain-of-custody <br /> records are presented In Appendix B <br /> WORK IN PROGRESS <br /> Geocon performed a vapor extraction pilot test (VET) at the Shop 10 site on August 15, 1996 The <br /> purpose of the VET was to evaluate the feasibility and economics of using vapor extraction to <br /> I remove residual TPHg from soil beneath the site Results of the test indicate that soil vapor <br /> extraction Is both technically and economically feasible The VET results have been Included in a <br /> Problem Assessment Report/Corrective Action Plan that has been submitted to Caltrans separately <br /> from this quarterly groundwater monitoring report <br /> 1 <br />' Project No 58100-06-62 -3- November 27 1996 <br />