Laserfiche WebLink
15 January 2001 <br /> AGE-NC Project No 96-0232 <br />' Page 14 of 20 <br />' 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to ensure that visible air <br /> bubbles were not present in the vials after filling and capping Ground water sample containers were <br /> labeled with the well designation, date,time, and sampler's Initials <br />' Groundwater sample collection from RDW-1, DW-1, CSA-1, and CSA-2 were aclueved by opening <br /> the valve from the outlet sample port and allowing the pump to turn on and run for a minimum of <br />' 15 minutes to purge the wells prior to sampling <br /> Ground water samples were collected from wells EW-2, EW-4, EW-5, EW-6, EW-7, EW-8, EW-9 <br />' and EW-10 by allowing each extraction pump to be operational for at least 30 minutes <br />' 83 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br />' transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> for <br /> o TPH-g and TPH-d by EPA Methods 5030/8015 Modified and 3550/8015 Modified, <br /> respectively, <br /> e BTEX by EPA Method 8020, and <br /> • Methanol, ethanol, TBA,DIPE, ETBE, TAME and MTBE by EPA Method 8260 Modified <br />' 84 FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br />' 13 and 14 December 2000,the contaminant impact to ground water was assessed from the laboratory <br /> data <br /> 8 4 1 Ground Water Elevation And Gradient <br />' During the December 2000 momtoring event, depths to ground water from Flag City Chevron wells <br /> MW-1 through MW-13 were measured between 10 84 and 14 37 feet below the tops of the well <br /> casings, ground water elevations were calculated to be between 2 32 and 3 26 feet below mean sea <br />' level Ground water elevation at the site increased an average 2 64 feet between the August 2000 and <br /> the December 2000 ground water monitoring events The December 2000 ground water elevation <br /> data collected from the Flag City Chevron site and the adjacent Three B's Truck Plaza site is <br />' Advanced GeoEnvironmental,Inc <br />