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13 June 2005 <br /> AGE-NC Project No 97-0351 <br /> ' Page 2 of 4 <br /> ' 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each monitoring well using dedicated,disposable plastic bailers <br /> ' after allowing the wells to achieve a minimum 80% recovery of the pre-purge water volume The <br /> samples from each well were transferred into three 40-milliliter(ml)volatile organic analysis(VOA) <br /> vials containing 0 5 ml 18%hydrochloric acid solution as a sample preservative The samples were <br /> ' labeled with the monitoring well designation,date,time of sampling, and the sampler's initials and <br /> transported in a chilled container under chain of custody to Cal Tech Environmental Laboratories <br /> (CTEL), a Department of Health Services (DHS)-certified analytical Iaboratory, for analysis The <br /> ' samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> method 8015M, and <br /> • Benzene,toluene, ethylbenzene,and total xylenes(BTEX) and fuel additives tertiary butyl <br /> ' alcohol (TBA), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl <br /> methyl ether(TAME), methyl tertiary-butyl ether(MTBE), 1,2-dibromoethane (EDB), and <br /> 1,2-dichloroethane (1,2-DCA) in accordance with EPA method 8260B <br /> 1� <br /> ' 2 3 MONITORING WELL DESTRUCTION <br /> A permit for the destruction of monitoring well MW-UST was approved by the EHD on 05 January <br /> ' 2005 A copy of the well destruction permit is included in Appendix C <br /> The destruction of monitoring well MW-UST was performed on 15 February 2005 by Mitchell <br /> ' Drilling Environmental of Rancho Cordova, California under EHD oversight As per verbal <br /> instructions given in the field by EHD personnel,well destruction activities were performed utilizing <br /> a CME-75HT truck-mounted drill rig to pull approximately one-half of the well casing out of the <br /> 1 15-foot boring The boring, with the remaining portion of the well casing in place, was backfilled <br /> to surface grade with type I/I1 portland cement <br /> 3.0. FINDINGS <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 <br /> 1 Advanced GeoEnwonmental,Inc <br /> 1 <br />