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fel 04 February 2000 AGE Project No. 95-0118 Page 3 of 7 custody to McCampbell Analytical Inc. of Pacheco (MAI). Each sample was analyzed in accordance with the following: EPA Method 8015 Modified for total petroleum hydrocarbons quantified as gasoline (TPH- g) and • EPA Method 8020 for volatile aromatics - benzene, toluene, ethyl benzene and xylenes: (BTEX) and methyl tertiary butyl ether (MTBE). • The initial set of vapor samples was analyzed by EPA Method 8260-Modified for oxygenated compounds - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether(ETBE), methyl tertiary butyl ether (MTBE),tertiary-amyl methyl ether (TAME) and tertiary butanol (TBA). 2.4. MONITORING WELL PURGING On 25 October 1999, the depth to ground water in monitoring wells MW-I through MW-6 was measured relative to the top of the well casings using a Solinst water level meter. After water levels were measured, approximately six to eight gallons of water(a minimum of three well volumes)were removed from each ground water monitoring well using a submersible PVC pump. An ICM Model 52200 water analyzer was utilized to monitor temperature,pH and conductivity of purged water at <?, regular purge-volume intervals. Purged ground water was containerized in 55-gallon.diums and stored on-site. Stabilization data and field logs are included in Appendix A. 2.5. GROUND WATER SAMPLE COLLECTION AND ANALYSIS Water samples were collected from the purged wells using new disposable plastic bailers. The - collected samples were transferred into EPA-approved 40-m1 VOA vials containing 0.5 milliliters hydrochloric acid(18%) as a sample preservative. The samples were labeled, logged on a chain-of- custody hain-ofcustody form,placed in a chilled container and transported to McCampbell Analytical,Inc. (MAI) in Pacheco, California, a State of California Department of Health Services (DHS)-certified j laboratory. Each sample was analyzed in accordance with the following: • EPA Method 8015 Modified for TPH-g and • EPA Method 8020 for BTEX and MTBE. Advanced GeoEnvironmental,Inc.