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05 October 2001 <br /> _AGE-NC Project No=98-0521 - <br /> ' - <br /> 'Page 2 of 4 <br /> of the purged water was measured using an TCM water analyzer (Appendix A) Purged water was <br /> stored on-site in 55-gallon, DOT-approved drums <br /> 2 2 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 mto three 40-m1 <br /> ' T 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 McC_ampbell 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, f _ <br /> Volatile aromatic hydrocarbons -benzene, toluene, ethyl benzene and totalxylene (BTEX) <br /> -- r and methyl tertiary-butyl ether (MTBE}in accordance with EPA methods 8020, -- <br /> - I <br /> • Oxygenated`compounds =di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), _ <br /> R _ 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 /> a Method 8260B - <br /> 3.0. - FINDINGS <br /> The ground water flow direction and gradient were inferred from the surveyed well-casing elevation <br /> - - data-Dissolved petroleum hydrocarbon impact to ground water was assessed by laboratory analysis <br /> of the samples collected _ r <br /> e <br /> Advanced GeoEnvironmental,Inc <br />