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10 May 1999 <br /> AGE-NC Project No 96-0232 <br /> Page 2 of 5 <br /> ground water was containerized in 55-gallon drums and was stored on-site in an area lacking general <br /> Ipublic access <br /> 2 2 GROUND WATER SAMPLING <br /> Following well purging activities, ground water levels in monitoring wells MW-1, MW-2, MW-4, <br /> MW-5,MW-6A,MW-6B and MW-7 achieved a minimum of 80 percent recharge Prior to ground <br /> water sample collection, an additional gallon of ground water was purged from all wells utilizing a <br /> I teflon bailer and new rope Ground water samples were collected from the seven purged wells <br /> utilizing new, disposable polyethylene bailers, one-liter amber bottles and 40-m1 EPA-approved <br /> VOA vials containing 0 5 ml preservative, a grab ground water sample was collected at the faucet <br /> of the domestic water well utilizing one-liter amber bottle and 40-m1 EPA-approved VOA vials <br /> containing 0 5 ml preservative Care was taken to ensure that visible air bubbles were not present <br /> in the vials after filling and capping Ground water sample containers were labeled with the well <br /> designation, date, time, and sampler's initials <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> I 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 /> in accordance with <br /> • EPA Method 8015M for total petroleum hydrocarbons quantified as gasoline and diesel <br /> (TPH-g and TPH-d, respectively), , <br /> I • EPA Method 8020 for volatile aromatics (benzene, toluene, ethyl benzene and xylene <br /> BTEX) with methyl-tertiary butyl ether (MTBE), and <br /> • EPA Method 8260-modified for tertiary butanol (TBA),di-isopropyl ether(DIPS), ethyl tert <br /> butyl ether (ETBE), tert amyl methyl ether (TAME) and MTBE <br /> 3.0. FINDINGS <br /> I , <br /> From the field data, AGE was able to determine the ground water flow direction and gradient <br /> Laboratory analysis of seven ground water samples detected total petroleum hydrocarbons and <br /> MTBE in all seven samples, laboratoryanalysis of one drinking water well sample detected MTBE <br /> Advanced G eoE nviron men to],Inc <br /> I y <br /> t <br />