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I26 October 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 ager filling and capping Ground water sample containers were labeled with <br /> the well designation, date, time, and sampler's initials <br /> I2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> IEach 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, and <br /> I a Fuel oxygenated compounds - tertiary butanol (TBA), dl-Isopropyl ether(DIPE), ethyl tert <br /> butyl ether(ETBE), tert amyl methyl ether(TAME) and MTBE by EPA Method 8260 <br /> I3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 17 August 2000, the contaminant impact to ground water was assessed from the laboratory data <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> During the August 2000 monitoring event, depths to ground water from wells MW-1 through <br /> MW-10 were measured between 24 72 and 26 31 feet below the tops of the well casings, ground <br /> +— t-- _� t_�_� t-- t--� - -- - t e nt r--L - -A t c An r--� t--t--- l-- t <br /> i W aL%11 G1G V 0.L1U11J W U1 a t diCUla ed W UG UGL W ee l I,+ U l 1GGL Qllll 1 J `W lCet UGIU W 111GcL11 SGQ 1G V Gl <br /> Ground water elevation at the site decreased an average 2 87 feet between the April 2000 and the <br /> August 2000 ground water monitoring events The ground water elevation data for MW-1 through <br /> MW-10 during the August 2000 ground water monitoring event is depicted in Figure 3 <br /> The general ground water gradient at the site was calculated to be approximately 0 002 ft/fl or <br /> Advanced GcoEnviron mental,Inc <br /> I <br />