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i <br /> ' 08 February 2005 <br /> AGE-NC Project No 00-0764 <br /> Page 2 of 4 <br /> 2 2 GROUND WATER SAMPLE COLLECTION <br /> ' Water samples were collected from the monitoring wells using dedicated disposable plastic <br /> bailers after allowing the wells to achieve a minimum 80%recovery of the pre-purge water <br /> volume Immediately upon retrieval, samples were transferred into chilled 40-milliliter(ml) <br /> EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml 18%hydrochloric acid <br /> solution as a sample preservative and 1-liter amber bottles without sample preservative <br /> The samples were properly labeled, placed in a chilled container, and transported under chain of <br /> custody to Cal Tech Environmental Laboratories (CTEL), a California Department of Health <br /> Services (DHS)-certified analytical laboratory located to Paramount, California Each sample <br /> was analyzed in accordance with <br /> • EPA Method 8015 Modified for total petroleum hydrocarbons quantified as gasoline <br /> (TPH-g) and diesel (TPH-d), and <br /> • EPA Method 8260B for volatile organic compounds (VOCs) including benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX), the fuel additives di-Isopropyl ether(DIPS), <br /> '. ethyl tertiary-butyl ether(ETBE), methyl-tertiary butyl ether(MTBE), tertiary-amyl <br /> methyl ether(TAME), tertiary-butyl alcohol (TBA), and the lead scavengers <br /> 1,2-dichloroethane (1,2-DCA) and ethylene dibromide (EDB) <br /> 23 WASTE DISPOSAL <br /> On 17 October 2003, American Valley Waste Oil of Delhi, California collected one 55-gallon <br /> ' waste water drum from the site The waste water was transported under non-hazardous waste <br /> manifests to American Oil Transfer in Riverbank, California, an EPA-approved disposal facility <br /> A copy of the non-hazardous waste manifest is Included In Appendix C <br /> 3.0. FINDINGS <br /> IGround water elevation, flow direction, and gradient were determined from field data collected <br /> from MW-1 through MW-4 on 16 October 2003, the contaminant Impact to ground water was <br /> quantified from the ground water laboratory data <br /> Advanced GeoEnviraomentai,Inc <br />