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Project No 58100-06-62 <br /> August 22, 1996 <br />' Page 3 <br /> Analytical Results <br /> TPHg was detected in the vicinity of the former UST excavation in wells VW-1 and MW-14 at <br />' concentrations of 4,100 micrograms per Mer (ug/1) and 10,000 ug/l, respectively TPHg <br /> concentrations in downgradient wells MW-12 and MW-13 were reported as 500 and 800 ug/l, <br /> respectively The distribution of gasoline range hydrocarbons in groundwater extends beyond <br /> downgradient wells MW-12 and MW-13 TPHg concentrations in upgradient and cross-gradient <br /> perimeter wells(MW-9, MW-16, MW-19, MW-20, and MW-24)ranged from below detection to 200 <br /> ug/l TPHd was detected in each of the wells sampled with the exception of well MW-19 TPHd <br /> 1 concentrations ranged from 70 to 1,100 ug/l <br /> Wells VW-1, MW-12, MW-13 and MW-14, located in the vicinity and downgradient of the former <br /> fuel USTs, contained benzene concentrations ranging from 23 ug/l to 3,200 ug/l Wells MW-9, <br /> MW-16, MW-19, MW-20, and MW-24, the perimeter upgradient and cross-gradient wells, contained <br /> low benzene concentrations ranging from below detection to 8 9 ug/l MTBE was detected in four <br /> monitoring wells at concentrations ranging from 0 6 to 46 ug/l <br /> TPHg, benzene and MTBE concentrations are depicted on Figure 3 A summary of the analytical <br /> laboratory test results is presented on Table 1 Laboratory reports and chain-of custody records are <br /> presented in Appendix B <br /> WORK IN PROGRESS <br /> Gcocon is scheduled to perform a vapor extraction pilot test (VET) during the month of August 1996 <br /> The purpose of the VET will be to evaluate the feasibility and economics of using vapor extraction to <br /> remove gasoline hydrocarbons from beneath the site <br /> 1 <br />