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i <br /> 1 r <br /> 23 April 2001 <br /> AGE-NC Project No 97-0301 <br /> ' Page 2 of 5 <br /> 2 2 GROUND WATER SAMPLING <br /> ' Following well purging, ground water levels in the monitoring wells were allowed to achieve a <br /> mimmum of 80 percent recharge prior to sample collection Ground water samples were collected <br /> ' from the purged wells utilizing new,disposable polyethylene bailers,one 1-liter amber bottle without <br /> a preservative and four 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric acid <br /> as a preservative Care was taken to ensure that visible air bubbles were not present in the vials after <br /> ' filling and capping Ground water sample containers were labeled with the well designation, date, <br /> time, and sampler's initials <br /> ' 23 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 /> transported to a California Department of Health Services (DHS)-certified laboratory for analysis <br /> for <br /> ' Total petroleum hydrocarbons quantified as gasoline, diesel and motor oil (TPH-g, TPH-d <br /> , <br /> and TPH-mo, respectively)by EPA Methods 8015NV5030 and 8015M/3550, respectively, <br /> • Volatile aromatic compounds - benzene, toluene, ethyl benzene and xylene (BTEX) with <br /> methyl-tertiary butyl ether(MTBE)by EPA Method 8020, <br /> ' Fuel oxygenated compounds - tertiary butanol (TBA), di-isopropyl ether(RIPE), ethyl tert <br /> butyl ether(ETRE),tert amyl methyl ether(TAME), methanol, ethanol and MTBE by EPA <br /> ' Method 8260M <br /> • Ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA)by EPA Method 8260M <br /> 1 <br /> 24 SURVEYING OF MONITORING WELLS <br /> On 04 January 2000 and 02 February 2001, a California state-licensed survey engineer from <br /> Baumbach & Piazza, Inc surveyed reference points on the casing tops of wells MW-1 through <br /> MW-7 to the nearest 0 01-foot relative to the City of Stockton bench mark datum BM # 117 By <br /> letter dated 18 April 2001,Baumbach&Piazza reported revised results for City of Stockton bench <br /> mark datum BM # 117 and wells MW-1 through MW-7 Revised results for the monitoring well <br /> ' survey are contained in Table 1 A copy of the revised surveying report(Baumbach&Piazza Job No <br /> 9797) is in Appendix B <br />� ' Advanced GeoEnvlronmental,Inc <br />