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24 May 2001 <br /> I . Y - <br /> AGE-NC Project No 98-0521 <br /> '- Page 2 of 4 _ <br /> ' of the purged water was measured using an ICM water analyzer (Appendix A) Purged water was <br /> stored on-site in 55-gallon, DOT-approved drums <br /> ' <br /> 22 COLLECTION OF GROUND WATER SAMPLES <br /> '- Prior to collection of ground water samples, the depth to ground water was again measured in each <br /> well to ensure that a minimum of 80% of the initial well volume had recharged Water samples were <br /> ' collected from each well using a new disposable plastic bailer and were transferred into three chilled <br /> 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml hydrochloric acid (18%) as a sample <br /> preservative The samples were then labeled and placed in a chilled container for transportation <br /> ' under chain-of-custody to McCampbell Analytical, Inc, a California Department of Health Services <br /> (DHS)-certified laboratory <br /> 2 3 GROUND WATER SAMPLE ANALYSIS <br /> Ground water samples were analyzed for the following <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g ) in accordance with EPA <br /> ' Method 8015 Modified, <br /> • Volatile aromatic hydrocarbons - benzene, toluene, ethyl benzene and total xylene (BTEX) <br /> ' and methyl tertiary-butyl ether (MTBE) in accordance with EPA methods 8020, <br /> • Oxygenated compounds - di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), <br /> MTBE, tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), methanol, ethanol, <br /> ' ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA <br /> Method 8260B <br /> z 3.0. FINDINGS <br /> ' The groundwater flow direction and adient were calculated from the measured well elevation data <br /> g �' <br /> issolved petroleum hydrocarbon impact to ground water was assessed by laboratory analysis of the <br /> ' samples collected <br /> • <br /> ' Advanced GeoEnvironmentsl,Inc <br /> _1 - <br />