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, 1 <br /> I <br /> ` 1 <br /> 23,June 1999 <br /> AGE-NC Project No 95-0121 <br /> Page 2 of 5 <br /> Ii <br />' - <br /> 22 GROUND WATER SAMPLING <br /> Following well purging, ground water levels in monitoring wells MW-1 through MW-9 achieved <br /> a minimum of 80 percent recharge prior to sample collection Ground water samples were collected ; <br /> from the purged wells utilizing new, disposable polyethylene bailers, one-liter amber bottles and <br /> three 40-m1 EPA-approved VOA vials containing 0 5 mI 18%hydrochloric acid as a preservative <br />' Care was taken to ensure that visible air bubbles were not present in the vials after filling and <br /> capping Ground water sample containers were labeled with the well designation, date, time, and <br /> sampler's initials <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> 1 <br /> Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br />' transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> in accordance with <br /> y e <br />' • EPA Method 8015M for total petroleum hydrocarbons quantified as gasoline and diesel <br /> (TPH-g and TPH-d, respectively), <br /> • EPA Method 8020 for volatile aromatic compounds benzene, toluene, ethyl benzene and <br />' xylene (BTEX) with methyl-tertiary butyl ether(MTBE), and <br /> • EPA Method 8260M for tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert butyl <br /> ether(ETBE), tert amyl methyl ether(TAME),and MTBE <br /> r <br /> 2 4 Well Survey ' <br /> IOn 30 March 1999, a California state-licensed survey engineer from Baumbach & Piazza, Inc <br /> surveyed a reference point on the top of ground water monitonng wells MW-1 through MW-9 to the <br /> nearest 0 01-foot relative to the City of Stockton Bench Mark Datum # COS`186 The results ofthe <br /> monitoring well survey are contained in Table 2 The surveying report(Baumbach& Piazza Job No <br /> 9797) is presented in Appendix B <br /> 3.0• FINDINGS r <br /> AGE was able to determine ground water flow direction and gradient from the field data collected <br /> on 29 March 1999 Laboratory analysis detected TPH-g, TPH-d and BTEX in six ground water <br /> T Advanced GeoEnvironmental,Inc <br /> t , <br /> I <br />