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I <br /> CLEARWATER <br /> G R O U P, I N C <br />' Prior to sampling, each monitoring well was gauged to the nearest hundredth of a <br /> foot The wells were then purged of at least three well casing volumes while <br />' monitoring the purge water temperature, conductivity, and pH The wells were <br /> purged until the parameters stabilized or until the well went dry Monitoring well <br /> gauging and purge data are included in Appendix A <br />' Each groundwater sample was collected with a dedicated polyethylene bailer and <br /> was transferred to sample containers appropriate for the required analyses Sample <br />' containers were labeled with well numbers and placed in a cooler A chain-of- <br /> custody was prepared and accompanied the samples to the laboratory Groundwater <br /> sample analysis was performed by PACE, Inc , DHS-certified laboratory located in <br />' Petaluma, California All groundwater samples were analyzed for TPHg by EPA <br /> Method 8015 (CA LUFT modified), and for BTEX by EPA Method 8020 (CA LUFT <br /> modified) <br /> 4.0 RESULTS <br /> 4.1 Water Level Monitoring Data <br /> Groundwater elevations are presented on Table 1 The depth to groundwater in the <br /> monitoring wells ranged from 22 66 to 23 25 feet on June 8, 1995 The depth to <br /> groundwater was measured relative to mean sea level, from the survey mark on top <br /> of each well casing Groundwater elevation contours are presented on Figure 3 <br /> The local groundwater flow direction was calculated to be towards the northeast at <br /> an approximate gradient of 0 9% (0 009 feet/foot), which is consistent with results <br /> obtained during previous monitoring events <br /> 4.2 Ground Water Analytical Results <br /> I A summa of analytical results is resented on Table 1 and on Figure 4 TPH was <br /> summary Y P � g <br /> I detected in groundwater samples MW-3 and MW-4 in concentrations of 300 and 100 <br /> parts per billion (ppb), respectively Benzene was detected m groundwater samples <br /> MW-2, MW-3 and MW-4 in concentrations ranging from 16 ppb in sample MW-2 <br /> I to 110 ppb in sample MW-3 None of the analytes were detected in concentrations <br /> exceeding method detection limits in groundwater samples MW-1 or MW-5 A <br /> copy of the laboratory report and chain-of-custody form is attached as Appendix B <br /> I <br /> D-103 QMR 2 July 11, 1995 <br />