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' 28 April 1999 AGE-NC Project No 95-0137 Page 2 of 5 of water were removed from each vapor extraction wells 1 Temperature, pH, and conductivity were measured at approximately one-gallon intervals using an ICM Water Analyzer Model No 5200 The field data sheets are included in Appendix A Purged ' water was stored on-site in 55-gallon drums 1 22 GROUND WATER SAMPLE COLLECTION ' After purging a minimum of three well-volumes of water from each well and a minimum of 80 % recharge recovery of the water level in the wells,water samples were collected from each well using new, clean, disposable plastic bailers The samples "ere transferred into 40-nil EPA-approved VOA. vials and into 1-liter amber bottles Samples were stored in a chilled container and transported under chain-of-custody to McCampbell Analytical Laboratories (MAI) in Pacheco, California, a State of California Department of Health Services (DHS)-certified laboratory Each sample was analyzed in accordance with the following EPA Method 8015 Modified for total petroleum hydrocarbons quantified as gasoline (TPH- g), t • EPA Method 8015 Modified for total petroleum hydrocarbons quantified as diesel (TPH-d), • EPA Method 8020 for benzene, toluene, ethylbenzene, and total xylenes (BTEX) and ' • EPA Method 8260 Modified for methyl-tert butyl ether (MTBE), tertiary butyl alcohol (TBA), di-isopropyl ether(DIPS),ethyl tertiary butyl ether(ETBE) and tertiary amyl methyl ' ether (TAME) 3.0. FINDINGS ' Ground water elevations and flow direction were calculated from field data and petroleurn- hydrocarbon impact was quantified through laboratory from observation and samples collected over the last quarter 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION ' Depth to ground water at the site ranged from 15 64 to 17 37 feet below surface grade(bsg) The data indicates an average decrease of the relative ground water elevation at the site of 1 5 feet in the Adsanted GcoEnVLronmentR1,Inc