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Item Evaluation Criteria Comments/Discussion <br /> impacted soil likely remains under the former <br /> UST pit, beneath the dispenser island excavation <br /> and current UST pit Historical soil sample <br /> results are presented in Table 2 TPHg and <br /> benzene concentration contours are presented in <br /> Figures 6 and 7, respectively Mass calculations <br /> suggest that approximately 10 1 gallons and 0 02 <br /> gallons of TPHg and benzene, respectively, <br /> remain in soil Calculations are presented as <br /> Tables 4 and 5 <br /> 2 4 Separate-Phase Hydrocarbon Definition Free product has never been observed in any site <br /> Status well or excavation pit <br /> 2 5 Groundwater Definition Status Historically, the highest TPHg, benzene and <br /> MTBE reported in groundwater was 5,300 pg/L, <br /> 100 pg/L and 2,100 pg/L, respectively in <br /> monitoring well C-2 Currently no TPHg or <br /> benzene is reported in any well and MTBE is <br /> reported in wells C-1 and C-2 at 4 pg/L and 70 <br /> gg/L, respectively Grab-groundwater samples <br /> collected from the January 2006 investigation <br /> reported minor MTBE in soil borings <br /> Groundwater appears to be defined vertically and <br /> laterally Mass calculations suggest that only <br /> 0 027 gallons of MTBE remain in groundwater <br /> Mass calculations are presented as Table 6 <br /> 26 TPHg/BTEX Plume Stability and The MTBE plume appears to be limited to the <br /> Concentration Trends second water bearing zone at approximately 25 to <br /> 30 fbg The hydrocarbon plume is stable and <br /> decreasing <br /> 27 Groundwater Definition Status(MTBE) MTBE is currently only reported in C-1 and C-3 <br /> 28 MTBE Plume Stability and Only minor MTBE remains in groundwater and <br /> Concentration Trends is limited to the area of the former USTs <br /> 29 Groundwater Flow Direction,Depth Groundwater has been encountered at <br /> Trends and Gradient approximately 19 fbg during previous <br /> investigations Historical groundwater data infers <br /> a flow direction of northeast <br /> 3 <br />