Laserfiche WebLink
29 December 1999 <br /> AGE-NC Project No 96-0229 <br />' Page 2 of 5 <br />' an area lacking general public access <br /> 2 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels in monitoring wells MW-1 through MW-10 achieved <br /> a minimum of 80 percent recharge prior to sample collection Ground water samples were collected <br /> from the purged wells utilizing new, disposable polyethylene bailers and three 40-m1 EPA-approved <br /> VOA vials containing 0 5 ml 18%hydrochloric acid as a preservative Care was taken to ensure that <br /> visible air bubbles were not present in the vials after filling and capping Ground water sample <br /> containers were labeled with the well designation, date, time, and sampler's initials , <br /> I <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 /> of <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g)by EPA Method 8015M, <br /> • Volatile aromatic compounds (benzene, toluene, ethyl benzene and xylene BTEX) with <br /> methyl-tertiary butyl ether(MTBE) by EPA Method 8020, and <br /> • Tertiary butanol (TBA), di-isopropyl ether (RIPE), ethyl tert butyl ether (ETBE), tert amyl <br /> methyl ether(TAME) and MTBE by EPA Method 8260M <br /> I3.0. FINDINGS <br />' AGE determined that ground water flow direction was towards the northeast at a gradient of 0 003 <br /> ft/ft from the field data collected on 11 October 1999 Laboratory analysis of ten ground water <br /> samples detected TPH-g and BTEX Ycompoun(dnsmin five ground water samples, fuel oxygenated <br /> com.pol.{nds were detected, ill six ground water samples <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> During the October 1999 monitonng event, depths to ground water from wells MW-1 through MW- <br /> 10 were measured between 26 30 and 28 09 feet below the tops of well casings, ground water <br /> elevations were calculated to be between 15 73 feet and 17 17 feet below mean sea level Ground <br /> IAdvanced GeoEnvironmental,Inc <br /> I <br />