Laserfiche WebLink
s F <br />' 09 August 2000 <br /> AGE-NC Project No` 96-0229 <br />' Page 2 of 5 <br />' 2 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels from each well achieved a minimum of 80 percent <br /> recharge prior to sample collection Ground water samples were collected from the purged wells <br /> utilizing new, disposable polyethylene bailers and four 40-m1 EPA-approved VOA vials containing <br /> 0 5 ml 18%hydrochloric acid as preservative Care was taken to ensure that visible air bubbles were <br /> not present in the vials after filling and capping Ground water sample containers were labeled with <br /> the well designation, date, time, and sampler's initials <br /> 2 3 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 (TP - <br /> 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(DIPE), ethyl tert butyl ether(ETBE), tert amyl <br /> methyl ether (TAME) and MTBE by EPA Method 8260M <br /> I3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 14 April 2000, the contaminant impact to ground water was assessed from the laboratory data <br /> Laboratory analysis of eleven ground water samples detected TPH-g in six samples, BTEX <br /> compounds in six samples,MTBE in eight samples and TBA in three samples <br /> I3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> Dffin <br /> ug the t1k]P 11 2000 rn0r,It011 lg e V eiit, diIId Y&0 II <br /> epths to �rulW dteW ell 'S V1TYV-1 uirougn lv1 VV-1 V <br /> were measured between 2167 and 23 52 feet below the tops of the well casings, ground water <br /> elevations were calculated to be between 11 10 feet and 12 44 feet below mean sea level Ground <br /> water elevation at the site increased an average 5 05 feet between the January 2000 and the April <br /> —2000-ground water monitoring events The groundwater elevation data-for MW-1-through MW-10 - <br /> dunng the January 2000 ground water monitoring event is depicted in Figure 3 The general ground <br /> IAdvanced GeoEnvironmental,Inc <br />