Laserfiche WebLink
Metadata
Document management portal powered by Laserfiche WebLink 9 © 1998-2015 Laserfiche. All rights reserved.
' 07 December 2000 <br /> AGE-NC Project No 97-0301 <br /> Page 2 of 4 <br /> 2 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels in the monitoring wells were allowed to achieve a <br /> 1 minimum of 80 percent recharge prior to sample collection Ground water samples were collected <br /> from the purged wells utilizing new,disposable polyethylene bailers,one 1-liter amber bottle without <br /> a preservative and four 40-mi EPA-approved VOA vials containing 0 5 ml 18%hydrochloric acid <br /> ' as a 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 /> time, and sampler's initials <br /> 23 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 /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively)by EPA Methods 8015M/5030 and 8015M/3550, respectivley, <br /> • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) with <br /> ' methyl-tertiary butyl ether (MTBE)by EPA Method 8020, <br /> • Fuel oxygenated compounds - ethylene dibromide (EDB), 1,2-dichloroethane (1,2-DCA), <br /> ' tertiary butanol (TBA), dl-Isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl <br /> methyl ether(TAME), methanol, ethanol and MTBE by EPA Method 8260M <br /> ' <br /> 30 FINDINGS <br /> ' Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 14 September 2000, the contaminant impact to ground water was assessed from the ground water <br /> ' laboratory data <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water in wells MW-1, MW-2, MW-3 and MW-4 were measured between <br /> ' 29 22 and 29 98 feet below the tops of well casings, ground water elevations were calculated to be <br /> between 26 01 feet and 26 21 feet below mean sea level Ground water elevation at the site decreased <br /> an average 3 33 feet between the June 2000 and the September 2000 ground water monitoring <br /> Advanced GeoEnvlronmental,Inc <br />