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1 <br /> 03 August 2000 <br />' AGE-NC Project No 98-0448 <br />' Page 2 of 4 <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 a preservative Care was taken to ensure that visible air bubbles <br />' were not present in the vials after filling and capping Ground water sample containers were labeled <br /> with 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 (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 <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 /> I <br /> 3.0 FINDINGS <br />' AGE determined ground water flow direction and gradient from the field data collected on 28 April <br /> 2000 Laboratory analysis of nine ground water samples detected TPH-g in six samples, BTEX <br />' compounds in six samples,MTBE in two samples, DIPE in two samples and TBA In three samples <br />' 3 3 GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water from wells MW-1 through MW-8 were measured between 15 80 and ' <br />' 18 03 feet below the tops of the well casings Ground water elevations at the site were calculated to <br /> be between 7 18 feet and 8 62 feet below mean sea level, ground water elevations are depicted in <br /> Figure 3 Ground water elevation at the site increased an average 1 75 feet between the September <br /> I1999 and April 2000 ground water monitoring events The general ground water gradient at the site <br />. was calculated to be approximately 0 008 ft/ft or approximately 42 feet per mile and directed towards <br />' Advanced GeoEnvironmental,Inc <br /> I , <br />