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' 23 April 1999 > AGE-NC Project No. 98-0440 Page 2 of 5 ; public access. ' 2.2. GROUND WATER SAMPLING ". Following purging, ground water,levels in monitoring wells MW-1 through MW-4 achieved,a minimum of 80'percent recharge'prior,to sample collection. Ground water samples were collected ' from the four- ur ed wells utilizing - p g ng new, disposable polyethylene bailers, one liter amber bottles and four 40-m1'EPA'approved VOA vials containing 0.5 mi 18% HCL as a sample preservative. ' Care was.taken to ,ensure that visible air bubbles were not present in the vials after filling and capping. Ground water sample containers were labeled with the well designation,'date, time, and .' sampler's initials: .. ._i 2.3. LABORATORY ANALYSIS OF GROUND WATER SAMPLES Each ground water sample was logged,on a chain-of-custody form,placed in a chilled container and transported to a'California Department of Health Services (DHS)-certified laboratory for analysis.. 1 in accordance with: IEPA Method 8015M for total petroleum hydrocarbons quantified as gasoline and diesel, (TPH-g and TPH-d,respectively), • EPA Method 8020 for.volatile aromatics (benzene, toluene, ethyl benzene -and xylene: BTEX) with methyl-tertiary butyl-ether (MTBE), and • EPA-Method 8260 for tertiary butanol (TBA), di-isopropyl ether (DIPS);'ethyl tert butyl . " ether(ETBE), tert`amyl methyl ether'(TAME) and MTBE:. 3.0. FINDINGS. . From the field data, AGE was able to determine the ground water flow direction and gradient: Laboratory analysis of four ground water samples detected petroleum hydrocarbons in two of the four water samples; volatile aromatics were, detected in two of four groundwater samples; no oxygenated fuel additive's were detected fi ground water samples.-- 3.1. amples.3.1. RELATIVE GROUND WATER ELEVATION ANDDIENT . .-• - • GRA • _ .: - : . i Advanced GeoEnvfronmental,Inc.