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Fr <br /> I10 October 2005 <br /> . AGE-NC Project No 04-1168 <br /> Page 4 of 7 <br /> measured at regular intervals during purging using an Oakton water analyzer Field sheets and data <br />' are included in Appendix C Purged water was stored on-site in properly labeled, 55-gallon, DOT- <br /> approved drums <br /> I <br /> 2 2 2 Collection and Analysis of Ground Water Samples <br />' Water samples were collected from each well using the inertia pump after allowing the wells to <br /> achieve a minimum 80%recovery of the pre-purge water volume Each water sample was transferred <br />' into laboratory-supplied 40-milliliter(ml) volatile organic analysis (VOA) vials containing 0 5 ml <br /> hydrochloric acid solution as preservative, and one 1-liter amber bottle without preservative After <br /> collection, the samples were properly labeled, placed in a chilled container, and transported under <br />' chain-of-custody to CTEL for analysis The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br />' Methods 8015M, <br /> • Benzene,toluene, ethylbenzene and total xylenes (BTEX)in accordance with EPA Method <br /> 8260B, and <br /> • Fuel additives di-isopropyl ether(DIPS), ethyl tertiary-butyl ether(ETBE),methyl tertiary- <br /> butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br />' 1,2-dichloroethane (1,2-DCA) and ethylene dibromide (EDB) in accordance with EPA <br /> Method 8260B <br /> 1 <br /> 3.0. FINDINGS <br />' Soil stratigraphy, ground water elevation, flow direction, and gradient were determined from field <br /> data The contaminant impact to soil and ground water was quantified from laboratory analytical <br />' data <br />' 31 STRATIGRAPHY <br /> In general, orange brown clayey and sandy silts, with low plasticity and variable toughness was <br />' encountered from surface grade to 15 feet bsg in all well borings Orange brown silty clays with <br /> moderate plasticity and low toughness were encountered from 15 feet to 30 feet bsg in borings MWI. <br />' and MW3, whereas orange brown sandy silts were encountered from 20 to 65 feet bsg in boring <br /> MW2 Sandy silt was also encountered between 30 to 50 feet bsg in boring MW 1 and from 35 to 63 <br /> feet bsg in boring MW3 Olive brown and blue gray silty clays were encountered from 50 to 70 feet <br /> Adranced GeoEnrironmental,Inc <br /> 1 <br />