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' 01 October 2004 F <br /> AGE-NC Protect No 97-0333 <br /> Page 6of11 t1 <br /> 3 3 GROUND WATER SAMPLING <br /> Ground water samples were collected from the purged wells MW-1 through MW-5 utilizing new, <br /> 2-inch diameter disposable polyethylene bailers, ground water samples were collected from the <br /> purged wells MW-7 through MW-13 utilizing 3/8-inch diameter polyethylene tubing and the above <br /> referenced Watera Hydro-Lift H system Ground water samples were transferred into 40-m1 EPA- <br /> approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative Care was <br /> taken to ensure that visible air bubbles were not present in the vials after filling and capping Ground <br /> water sample containers were labeled with the well designation, date, time, and sampler's initials <br /> 3 4 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> 1 Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> transported to Cal Tech Environmental Laboratories, a DHS-certified laboratory for analysis for <br /> • TPH- b EPA Methods 5030/8015M <br /> g Y <br /> • BTEX by EPA Method 8260B, and <br /> • Volatile organic compounds,including PCE, TCE, 1,2-DCA,EDB,MTBE,TAME,DIPE, <br /> ' ETBE and TBA by EPA Method 8260B ; <br /> 3 5 QUARTERLY GROUND WATER MONITORING RESULTS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 31 March 2004, the contaminant impact to ground water was quantified by laboratory analysis of <br /> water samples collected on 01 and 02 April 2004 <br /> 3 5 1 Ground Water Elevation and Gradient <br /> ' The depths to ground water were measured at between 20 37 feet (MW-11A) and 22 97 feet <br /> (MW-8B) below the tops of the well casings on 31 March 2004, ground water elevations were <br /> calculated to be between 9 97 feet(MW-11C) and 11 81 feet(MW-1)above mean sea level(MSL) <br /> Based on current and previous monitonng data collected from wells MW-1 through MW-13,ground <br /> water elevation at the site generally increased an average 3 53 feet between the November 2003 and <br /> the March 2004 ground water monitoring events <br /> Advanced GeoEnvironmental,Inc <br /> i <br />