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' 15 May 2002 <br /> AGE-NC Project No 98-0432 <br /> Page 2 of 4 <br /> Appendix A Purge water generated from the site monitoring wells was contained on-site in <br /> appropriately labeled 55-gallon drums <br /> r22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Ground water samples were collected from the monitoring wells using disposable polyethylene <br /> bailers These bailers are disposed of after one use and require no decontaminating,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 /> ' in Pacheco,California,a State of California Department of Health Services(DHS)Laboratory Each <br /> sample was analyzed for <br /> ' • Benzene, toluene, ethylbenzene and total xylenes(BTEX)In accordance with EPA Method <br /> 8020, <br /> • Total petroleum hydrocarbons quantified as diesel and motor oil(TPH-d/mo)In accordance <br /> with EPA Method 8015 Modified, <br /> ' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br /> • Fuel additive compounds Including di-Isopropyl ether (DIPE), ethyl-tertiary-butyl ether <br /> ' (ETBE), methyl-tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), and <br /> tertiary-butanol (TBA), 1,2-dichloroethane (1,2-DCA), ethyl dibromide (EDB) and <br /> 1,2-dibromoethane in accordance with EPA Method 8260 Modified <br /> ' 3.0 FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> t April 2002, the contaminant Impact to ground water was quantified by the ground water sample <br /> laboratory analytical data <br /> 3 1 GROUND WATER ELEVATION, FLOW DIRECTION AND GRADIENT <br /> ' The depth to ground water measured In the water-table wells ranged from 15 41 to 17 08 feet below <br /> the top of the well casing(btoc)(Table 1) The ground water elevations at the site ranged from 20 88 <br /> Advanced GeoEnvironmental,Inc <br />