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• 23 July 2001 <br />' AGE-NC Project No 95-0143 <br /> Page 2 of 4 <br />' tops of the well casings Depth to water was not measured m the five vapor extraction wells, stored <br /> vehicles at the site blocked access to the wells The ground water elevations (Table 1) and hydraulic <br /> gradient(Figure 3) were determined from these data <br />' After measurement of depths to water, each monitoring well at the site was purged usn a two-stage <br /> I submersible purge pump The pump was decontaminated prior to purging each well using an <br /> Alconox solution and clean tap water Temperature, pH and conductivity of the purged water were <br /> measured at regular intervals during purging using an Oakton and an ICM water analyzers <br />' Approximately 8 to 14 5 gallons of water were removed from each well except for MW-9, from <br /> which 55 gallons of water were purged (approximately three casing-water volumes) All purged <br /> water was stored in 55-gallon DOT-approved drums on-site Field data and field logs are included <br /> in Appendix A and B <br />' 23 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new, disposable bailers and, upon <br /> retrieval,were transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml 18%hydrochloric <br /> acid as a sample preservative The samples were labeled and transported under chain-of-custody, in <br /> a chilled container, to McCampbell Analytical, Inc (MAT), a DHS-certified laboratory, and were <br /> analyzed for <br /> • Total petroleum hydrocarbons quatificd as gasoline (rPH-g) in accordance with EPA <br /> IMethods 5030/8015m4 <br /> • Volatile aromatic hydrocarbons- benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> and methyl tertiary butyl ether (MTBE) in accordance with EPA Method 8020/602 <br /> • Fuel oxygenates - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br /> tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), ethanol and methanol in <br /> accordance with EPA Method 8260M <br />' 3.0. FINDINGS <br /> Ground water elevation was calculated and flow direction was inferred from field data, the <br /> hydrocarbon impact to ground water and soil was inferred from laboratory analysis and field <br /> observations <br /> Advanced Oreo nvironmental,Inc <br />