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' 17 May 2002 <br /> AGE-NC Project No 99-0584 <br />' Page 2 of 4 - <br />' Purge water generated from the site monitoring wells was contained on-site in appropriately labeled <br /> 55-gallon drums <br />' 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br />' Water samples were collected from each monitoring well usingnew,disposable polyethylene bailers <br /> after allowing the wells to achieve a minimum 80% recovery of the pre-purge water volume, the <br /> bailers are disposed of after one use and require no decontaminating, thereby minimizing cross <br /> contamination due to sampling devices Each water sample was transferred into three 40-m1 <br /> EPA-approved VOA vials containing 0 5 ml 18%HCl as a sample preservative and into one 1-liter <br /> amber bottle without preservative After collection,the samples were labeled and placed in a chilled <br />' container for transportation under chain-of-custody to McCampbell Analytical Laboratory(MAI), <br /> a State of California Department of Health Services-certified analytical laboratory in Pacheco, <br /> California, and analyzed for <br /> ' Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in <br /> • accordance with EPA Method 8015 Modified, <br /> Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) in accordance with EPA Method 8020, and <br /> Fuel additives including MTBE,d1-isopropyl ether(DIPE),ethyl-tertiary-butyl ether(ETBE), <br /> tertiary-amyl methyl ether(TAME),tertiary-butanol (TBA), 1,2-dichloroethane(1,2-DCA) <br /> I and ethyl dibromide (EDB)/1,2-dibromo ethane in accordance with EPA Method <br /> 8260 Modified <br /> I <br /> 3.0. FINDINGS <br /> Ground water elevation and flow direction were calculated from field data, the hydrocarbon impact <br /> to ground water was assessed by laboratory analysis <br /> I <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> IDepth to ground water at the site ranged from 12 13 to 12 81 feet below the well casing tops The <br /> ground water elevations at the site ranged from 86 80 feet to 86 89 feet above mean sea level(MSL) <br /> The ground water elevation increased approximately 0 238 feet since the last monitoring event <br /> ' r <br /> f <br />