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' 11 November 2002 AGE-NC Project No. 98-0468 ' Page 2 of 4' Oakton water analyzer to monitor stabilization of these ground water parameters.Field data logs are ' included in Appendix B. Purged water was temporarily stored on-site in 55-gallon drums. ' 2.2. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES ' After allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume,water samples were collected from selected monitoring wells (MW-3 to MW-8) using new disposable bailers, and water samples were collected from monitoring wells (MW-9 and MW-10) using the ' Wattera inertial pump. The samples were transferred into 40-m1 EPA-approved vials containing 0.5 ml 18%hydrochloric acid as a sample preservative. The sample containers were then labeled with the monitoring well designation,date,time of sampling and the sampler's initials.The samples were ' transported in a chilled container under chain of custody to Mc Campbell Analytical Laboratory (MIA) , a State of California-Department of Health Services (DHS)-certified analytical laboratory for analysis. The samples were analyzed for: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 8015-Modified, ' Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and methyl tertiary butyl ether (MTBE) in accordance with EPA Method 8020, and ' The oxygenated fuel additives MTBE, tertiary butyl alcohol (TBA), di-isopropyl -ether ' (DIPE), ethyl tertiary butyl ether (ETBE) and tertiary amyl methyl ether (TAME) in accordance with EPA Method 8260 Modified. 1 Chain-of-custody protocols were used to document sample custody transfers from the field to the ' analytical laboratory. Sample chain-of-custody forms and laboratory reports are provided in Appendix C.- 2.3. :2.3. EQUIPMENT DECONTAMINATION ' All ground water sampling tools were washed in an Alconox solution and double-rinsed prior to use at each well. Wash and rinse water generated from decontaminating the equipment was placed in properly labeled DOT-approved model 17H 55-gallon drums and stored on-site. 3.0. FINDINGS ' Ground water elevation and flow direction were inferred from field data; act to hydrocarbon-impact. Y p ground water was quantified by laboratory analysis of the ground water samples. ' Advanced GeoEnvironmental,Inc.