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r " <br /> 1 <br /> I <br /> ' 15 September 2003 <br /> AGE-NC Project No 97-0333 <br /> i ' <br /> I I , <br /> Page 6 of 11 <br /> I � <br /> purged wells MW-7 through MW-13 utilizing 3/8-inch diameter polyethylene tubing Ground water <br /> ' samples were transferred into one-liter amber bottles without a preservative and Into 40-m1 EPA-r <br /> approved volatile organic analysis(VOA)vials containing 0 5 ml 18%hydrochloric acid as a sample <br /> preservative Care was taken to ensure that visible air bubbles were not present in the vials after ' <br /> filling and capping Ground water sample containers were labeled with the well designation, date, <br /> I ' time, and sampler's initials <br /> r <br /> 34 LABORATORY ANALYSIS OF GROUND WATER SAMPLES I I <br /> 1 <br /> Each ground water saixiple was lagged on achain-of-custody form,placed In a chilled container and IN <br /> transported to Cal Tech Environmental Laboratories, a California Department of Health Services l <br /> (DHS)-certified laboratory for analysis for <br /> • TPH-g by EPA Methods 5030/8015M, X11 V <br /> r , I <br /> • BTEX by EPA Method 8260B, and � <br /> I <br /> . • Volatile organic compounds, including PCE, TCE, 1,2-DCA, EDB,MTBE, TAME,DIPE, <br /> i ETBE and TBA by EPA Method 8260B <br /> ` I <br /> 11I � r <br /> 3 5 FINDINGS <br /> I <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 05 June 2003,the contaminant impact to ground water was quantified by laboratory analysis ofwater <br /> samples collected on 05 and 06 Jurie 2003 <br /> k I ,141 <br /> k � <br /> 4 <br /> `;3 5 1 ` Ground Water Elevation and Gradient <br /> ' r � r I <br /> The depths to ground water were measured at between 19 33 feet(MW-5) and 25 98 feet(MW-8E) <br /> I,I' <br /> below the tops of the well casings on 05 June 2003, ground water elevations were calculated to be r <br /> ' between 7 03 feet(MW-8E)and 12 64 feet(MW-5)above mean sea level,(MSL) Based on current ; <br /> and previous monitoring data collected from wells MW-1 through MW-13,ground water elevation k ' <br /> at',the site generally,increas6d an average 458 feet between the March 2003 and the,June 200311"1', <br /> ground water monitoring events 1 <br /> 0, <br /> , <br /> f 4 Ground water elevation data collected from multi-level wells MW-11, MW-12 and MW-13 on 05 <br /> June1'2003 is depicted on cross section F-F' (Figure 3) The vertical gradients between adjacent e <br /> I I , I ' <br /> ' r screen intervals are depicted on crass section F-F , the vertical'gradient was 11 calculated by kl� <br /> Advanced GeoEnvironmental,Inc {I� <br /> I " III � I Ik .I k{ li I I i tl IE I li Elll�f a i }I �1 <br />