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' 20 December 2001 <br /> AGE-NC Project No 95-0128 <br />' Page 5 of 9 <br /> 2 6 WELL MONITORING AND EVACUATION <br /> On 21 October 2001, a Solinst water level meter was used to measure the depth to ground water in <br /> monitoring wells MW-1 through MW-16 and vapor well VW1 <br /> On 22 October 2001, a minimum of 3 casing-water volumes were purged from each well to be <br />' sampled using a PVC submersible two-stage pump or disposal bailer or the wells were purged dry <br /> as occurred in well MW-9 Temperature, pH and conductivity of purged ground water were <br /> measured at various intervals, depending on the volume of water in each well,using an Hydac, ICM <br />' or Oakton water analyzers The field data and field sheets are included in Appendix A Purged water <br /> was discharged into the active ground water treatment system for disposal Following purging, the <br />' depth to ground water was measured to ensure that a minimum of 80% well-volume recharge had <br /> been achieved prior to sampling, except well MW-9 <br />' 27 GROUND WATER SAMPLE COLLECTION <br /> • A water sample was collected from each well using a the plastic bailer Immediately upon retrieval, <br /> the samples were transferred Into three 40-milliliter(ml)EPA-approved VOA vials containing 0 5 ml <br /> 18% hydrochloric acid (sample preservative) and into one I-liter amber bottle without the <br /> I preservative Samples were placed in a chilled container, stored on ice and transported under chain- <br /> of-custody <br /> hain- <br /> ofcustody to MAI, a DHS-certified laboratory The ground water samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Method 8015 Modified, <br />' Benzene, toluene, ethylbenzene and total xylenes(BTEX) in accordance with EPA Method <br /> 8020, and <br /> • Oxygenated compounds - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br />' methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol <br /> (TBA),methanol, ethanol, ethylene dibromide(EDB)and 1,2-dzchloroethane(1,2-DCA)in <br /> accordance with EPA Method 8260 Modified <br />' Advanced GeoEnvironmentai Inc <br />