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. 04 April 2002 <br /> AGE-NC Project No 96-0235 <br />' Page 2 of 5 " <br /> screened wells, ground water was purged from near the top of the water column to remove water <br />' trapped within the non-screened Interval of the well casings Ground water temperature, pH and <br /> conductivity were measured at regular purge-volume Intervals using an Oakton water analyzer Field <br />' sheets and data are included in Appendix A Purged water was stored on-site in labeled, 55-gallon <br /> DOT-approved drums <br /> 2 2 COLLECTION AND ANALYSIS'OF GROUND WATER SAMPLES <br />' Water samples were collected from each purged well using new disposable plastic bailers Each <br /> water sample was transferred Into 40-m1 VOA vials containing 0 5 ml 18%hydrochloric acid as a <br /> sample preservative and Into 1-liter amber bottles without preservative After collection,the samples <br />' were properly labeled, placed in a chilled container and transported under chain-of-custody to <br /> McCanipbell Analytical, Inc (MAI), a State of California Department of Health Services (DHS)- <br /> certified analytical laboratory, and were analyzed for <br /> a Total petroleum hydrocarbons quantified as gasoline (TPH-g) and as diesel (TPH-d) in <br /> . accordance with EPA Methods 5030/8015 and 3550/8015, respectively, <br /> a Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) in accordance with EPA Method 602/8020, and <br />' • Fuel oxygenates - di-Isopropyl ether (RIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br /> tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), methanol, ethanol, ethylene <br />' dibromide(EDB)and 1,2-dichloroethane(1,2-DCA)in accordance with EPA Method 8260 <br /> Modified <br /> r <br /> 23 PURGE WATER DISPOSAL F <br /> On 07 March 2002, approximately 750 gallons of non-hazardous purge water was pumped from <br /> on-site 55-2allon drums_The spurge water had been generated during previous ground water w_ <br /> Monitoring events Pumping and disposal was completed by American Valley Waste Oil, Inc of <br /> t Delhi, California A copy of the waste disposal manifest is Included in Appendix C <br /> 3.0. FINDINGS <br /> Ground <br />' Ground water elevation and flow direction were inferred from field data, hydrocarbon-impact to <br /> • ground water was quantified by laboratory analysis of the ground water samples <br /> 1 F <br /> Advanced GeoEnvironmental,Inc <br />