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, <br /> 15 October 2000 <br /> AGE-NC Project No 96-0232 <br /> Page 10 of 15 <br />' into 40-m1 EPA`approved VOA vials containing 0 5 fnl 18% hydrochloric acid as a preservative <br /> Care was taken to ensure that visible air bubbles were not present in the vials after filling and <br /> capping Ground water sample containers were labeled with the well designation, date, time, and <br />' sampler's initials. <br /> Groundwater sample collection from RDW-1,DW-1, CSA-1, and CSA-2 were achieved by opening <br />' the valve from the outlet sample port and allowing the pump to turn on and run for a minunum of <br /> 15 minutes to purge the wells prior to sampling <br /> 5 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> 1 Each ground water sample was Iogged on achain-of-custody form,placed in a chilled container and <br /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis ' <br /> 1 for <br /> TPH-g and TPH-d by EPA Method 8015M, <br /> BTEX compounds and MTBE by EPA Method 8020, , <br /> methylene, ethylene, EDB, 1,2-DCA, TBA, DIPE, ETBE, TAME and MTBE by EPA <br />' Method 8260M <br /> 54 FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected'on <br /> 29 and 30 August 2000, the contaminant impact to ground water was assessed from the Iaboratory <br /> data <br /> -5 4 1 ,'Relative Ground Water Elevation And Gradient <br /> During the August 2000 monitoring event, depths to ground water from Flag City Chevron wells <br /> - MW-1 through MW-13 were measured between 12 77 and 17 13 feet below the tops of the well <br />' casings, ground water elevations were calculated to be between 4 49 feet and 7 55 below,mean sea <br /> level Ground water elevation at the site decreased anaverage 2 95 feet between the June 2000 and <br /> the August 2000 ground water monitonng events The August 2000 ground water elevation data <br />' collected from the Flag City Chevron site and the adjacent Three B's Truck Plaza site is depicted in <br /> Figures 5,;6, 7 and 8 <br /> r ' <br /> t Advanced GeoEnviroomentai,Inc. <br />