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1 <br /> 30 April 1999 <br /> AGE-NC Project No 98-0450 <br /> Page 2 of 5 <br /> ' then calculated by subtracting the measured depth to ground water from the surveyed casing <br /> elevation <br /> ' After water levels were measured,approximately 40 gallons (a minimum of three well volumes per <br /> well) of water were purged from wells BMW-1 and BMW-2, and approximately 5 to 8 gallons of <br /> water were purged from wells BMW-3, BMW-4, BMW-5 and MW-5 utilizing a two-stage <br /> submersible pump An ICM Model 52200 water analyzer was utilized to monitor temperature,pH <br /> and conductivity of purged water at regular purge volumes Field data and logs are Included with <br /> Appendix B Purged ground water was contamenzed in 55-gallon drums and stored on-site in an area <br /> ' lacking general public access <br /> ' 2 3 GROUND WATER SAMPLE COLLECTION <br /> ' The ground water levels in the wells were allowed to recover overnight The wells were then <br /> sampled on 24 February 1999 Ground water samples were collected utilizing disposable <br /> polyethylene bailers and new nylon rope Sufficient ground water sample was collected from each <br /> well to fill a one-liter amber bottle and three EPA-approved 40-m1 volatile organic analysis (VOA) <br /> vials contauung 0 5 ml of hydrochloric acid(18%) as a preservative for the samples Care was taken <br /> to ensure that visible air bubbles were not present in the VOAs after filling and capping Ground <br /> 1 water sample containers were labeled with the well designation, date, time, and sampler's initials <br /> 2 4 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> 1 transported to a McCampbell Analytical, Inc (MAI) of Pacheco, California, a State of California <br /> Department of Health Services (DHS)-certified laboratory for analysis in accordance with <br />' • EPA Method 8015 Modified for total petroleum hydrocarbons quantified as gasoline and <br /> diesel (TPH-g and TPH-d, respectively), <br /> • EPA Method 8020 for volatile aromatics (benzene, toluene, ethyl benzene and xylene <br /> BTE&X) and <br />' • EPA Method 8250 Modified for volatile organic compounds (VOCs)and di-isopropyl ether <br /> (DIPE), ethyl tert butyl ether(ETRE), methyl-tertiary butyl ether (MTBE), tert amyl methyl <br /> ether(TAME) and tertiary butanol (TBA) <br /> Advanced GeoEnvironmental,Inc <br />