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r Project No S8100-06-1 IB April 19, 1996 concentrations of 15 mg/kg benzene, 160 mg/kg toluene, 150 mg/kg ethylbenzene, and 730 mg/kg total xylenes TPHd and MTBE were not detected above the test method detection limit in soil ' samples collected from VW-2 44 Groundwater Analytical Results Groundwater samples were collected from the pre-existing wells, MW-I through MW-8 and VW-1, the new monitoring wells MW-9 through MW-12, and VW-2 The groundwater samples collected during the current site investigation were tested for the presence of TPHg, TPHd, BTEX, and MTBE ' The results of the most recent groundwater sampling events performed by Geocon are described below ' TPHd was not detected above the test method detection limit during this groundwater monitoring event ' TPHg was detected in the pre-existing wells, with the exception of MW-2, at concentrations ranging from 51 ug/L to 16,000 ug/L The highest TPHg concentrations were detected in the vicinity of the former UST excavation in wells VW-I and VW-2 at concentrations of 10,000 ug/L and 16,000 ug/L, ' respectively TPHg was not detected above the test method detection limit in the newly installed perimeter wells (MW-9, MW-10, and MW-12) The distribution of gasoline range hydrocarbons in groundwater is currently bounded by perimeter wells MW-9, MW-10, and MW-12 but extends beyond perimeter monitoring well MW-I 1 which exhibited a TPHg concentration of 500 ug/L BTEX was detected in the existing wells with the highest benzene concentrations present in VW-1 and VW-2 at concentrations of 1,700 ug/L and 3,000 ug/L, respectively Toluene and total xylenes were detected in six wells (MW-1, MW-3, MW-6, MW-7, VW-1, and VW-2) at concentrations ranging from 2 5 to 3,100 ug/L toluene and 19 to 2,000 ug/L total xylenes Ethylbenzene was detected in four wells(MW-1, MW-6,VW-1, and VW-2) at concentrations ranging from 2 5 to 860 ug/L BTEX was not detected in the perimeter wells with the exception of MW-11 where benzene and toluene was detected at concentrations of 3 5 ug/L and 2 3 ug/L,respectively ' MTBE was detected in six monitoring wells (MW-1, MW-3, MW-4, MW-7, MW-8, and MW-11) at concentrations ranging from 9 4 ug/L to 170 ug/L The highest MTBE concentration was detected in the perimeter well MW-11,which is the farthest well from the source area Historical analytical results and analytical results for groundwater samples collected during the site investigation are summarized on Table III A summary of groundwater analytical results are depicted ron Figure 5, Concentrations of Petroleum Hydrocarbons in Groundwater Laboratory reports and chain-of-custody records are presented in Appendix F 1 r 9 r