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. 30 December 1999 _ <br /> AGE-NC Project No 95-0121 <br /> 1 Page 2 of 5 <br />' 22 GROUND WATER SAMPLING <br /> Following well purging, ground water levels in all purged wells were allowed to achieve a minimum ` <br />' of 80 percent recharge prior to sample collection Ground water samples were collected from the <br /> purged wells utilizing new, disposable polyethylene bailers, one-liter amber bottles and three 40-m1 <br /> EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a preservative Care was <br />' taken to ensure that visible air bubbles were not present in the vials after filling and capping Ground <br /> water sample containers were labeled with the well designation, date, time, and sampler's initials <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br />' Each ground water sample was logged on a chain-of-custody form, placed in a chilled container and <br /> r transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br />' for <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br />' respectively) by EPA Method 8015M, ' <br /> • Volatile aromatic compounds (benzene, toluene, ethyl benzene and xylene BTEX) with <br /> methyl-tertiary butyl ether(MTBE) by EPA Method 8020, and <br />' • Tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl <br /> methyl ether (TAME) and MTBE by EPA Method 8260M <br /> Two ground water samples (MW-3 and EW=1) were submitted to A Keith Kaufman for miciobial <br /> enumeration and physicochemical analysis to assess feasibility of bioremediation at the site <br />' 3.0 FINDINGS <br /> , <br /> AGE determined that ground water flow direction was generally toward the northeast at a gradient <br /> Iof 0 002 from the field data collected on 20 October 1999 Laboratory analysis of nine ground water <br /> samples detected TPH-g, TPH-d, and BTEX, fuel oxygenated compounds'were detected in four <br /> ground water samples <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> L <br /> • The depths to ground water from wells MW-1, MW-2, MW-3, MW-4,MW-7, VW-3, VW-4,VW-6 <br /> and EW-1 were measured between 16 56 and 17 38 feet below the tops of,the well casings Ground <br /> Adianced GcoEnti iranmcntal,Inc <br /> I , <br />