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15 July 2002 <br /> • AGE-NC Project No 97-0301 <br /> ' Page 2 of 5 <br /> ' 2 2 GROUND WATER SAMPLING <br /> Following well purging, ground water levels at all wells achieved a minimum of 80 percent recharge <br /> ' prior to sample collection Ground water samples were collected from the purged wells utilizing new, <br /> disposable polyethylene bailers and transferred Into 1-liter amber bottles without sample preservative <br /> and 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric acid as a sample preservative <br /> ' Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping <br /> Ground water sample containers were labeled with the well designation, date, time, and sampler's <br /> initials <br /> 1 <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Following collection and labeling, each ground water sample was logged on a chain-of-custody form, <br /> placed in a chilled container and transported to a California Department of Health Services (DHS)- <br /> certified laboratory for analysis for <br /> • Total petroleum hydrocarbons quantified as gasoline, diesel, kerosene and motor oil (TPH-g, <br /> TPH-d, TPH-k and TPH-mo respectively)by EPA Methods 8015M/5030/3550/3510, <br /> • Benzene, toluene, ethyl benzene and xylene (BTEX) and methyl tertiary-butyl ether(MTBE) <br /> ' by EPA Method 8020, and <br /> • 1,2-Dichloroethane(1,2-DCA),ethylene dibromide(EBD), dl-Isopropyl ether(DIPE), ethyl tert <br /> ' butyl ether(ETBE),MTBE,tert amyl methyl ether(TAME), tertiary butanol (TBA), methanol <br /> and ethanol by EPA Method 8260M <br /> 1 <br /> 3.0 FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on O1 <br /> March 2002, the contaminant Impact to ground water was quantified by the ground water laboratory <br /> ' data <br /> I ' 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water in wells MW-I through MW-7 were measured at between 28 71 and 29 35 <br /> ' feet below the tops of well casings, ground water elevations were calculated to be between 16 33 feet <br /> (MW-3) and 16 57 feet(MW-5)below mean sea level Ground water elevation at the site increased an <br /> average 169 feet between the December 2001 and the March 2002 ground water monitoring events <br /> ' Advanced GeoEnvironmental,Inc <br /> i <br /> I <br />