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CLEARWATER <br /> G R O U P, I N C <br /> i1 <br /> 4.0 RESULTS <br /> ' 4.1 Water Level Monitoring Data <br /> On November 30, 1995, the depths to groundwater in the five monitoring wells <br /> ranged from 22 98 to 24 21 feet below grade Groundwater elevations were calculated <br /> for the purpose of drawing groundwater elevation contours As Figure 4 indicates, <br /> ' groundwater flow is toward the north and northwest The groundwater gradient is <br /> 14% across most of the site, but is only 0 5% between MW-2 and MW-6 This <br /> change in gradient appears as a slight flattening of the water table west of the former <br /> ' USTs, which is the same configuration of the water table as during previous <br /> gauging events <br /> ' 4.2 Groundwater Analytical Results <br /> TPHg and/or benzene were detected in samples collected from all monitoring wells <br /> except MW-4 The highest detected concentrations of TPHg and benzene were 52,000 <br /> parts per billion (ppb) and 140 ppb, respectively, in MW-2 Concentrations of TPHg <br /> and benzene were 1,700 ppb and 47 ppb, respectively, in monitoring well MW-5 <br /> Although downgradient well MW-6 was obstructed and could not be sampled <br /> ' during the fourth quarter, analytical results from the third quarter monitoring <br /> event indicate that hydrocarbons were not detected In the MW-6 sample <br /> ' A summary of groundwater elevations and analytical results is presented on Table <br /> 1 Hydrocarbon concentrations are presented graphically on Figure 4 A copy of the <br /> laboratory report and chain-of-custody form is attached as Appendix B <br /> 1 <br /> 1 <br /> 10 <br /> i <br /> D-101 4Q95 3 January 25, 1996 <br /> 1 <br />