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18 November 1998 �. AGE-NC Project No. 98-0470 Page 4 of 7 3.2. GROUND WATER MONITORING On 27 July 1998, a Solinst water level meter was used to measure the depth to ground water in the well relative to the top of the well casing. After a ground water depth measurement was collected, monitoring well MW-1 was purged using a PVC/stainless steel two-stage submersible pump. Approximately 10 gallons of water were evacuated from the well. Temperature,pH and conductivity were measured at 2-gallon intervals using an ICM model 52200 water analyzer. On 16 October 1998, a Solinst water level meter was used to measure the depth to ground water in the well relative to the top of the well casing. After a ground water depth measurement was collected, monitoring well MW-1 was purged using a PVC/stainless steel two-stage submersible pump. Approximately 12 gallons of water were evacuated from the well. Temperature, pH and conductivity were measured at 2-gallon intervals using an ICM model 52200 water analyzer. Stabilization data and field logs are included in Appendix B. T 3.3. GROUND WATER SAMPLE COLLECTION Upon stabilization,water samples were collected from the purged well using new, clean,disposable plastic bailers. Immediately upon retrieval, the sample was transferred into chilled 40-m1 EPA- approved VOA vials containing 0.5 ml hydrochloric acid (18%) as a sample preservative. The sample collected on 27 July 1998 was placed in a chilled container and transported under chain- of-custody to Sequoia Analytical a state-certified laboratory in Sacramento, California T:e sample was analyzed in accordance with: • EPA Method 8015m for TPH-g; • EPA Method 8020 for BTEX; _ • EPA Method 8260 for volatile organic compounds (VOCs) with MTBE. The sample collected on 16 October 1998 was placed in a chilled container and transported under chain-of-custody to MAI for analysis. The ground water sample was analyzed in accordance with the EPA Methods noted above except that EPA Method 8260m was utilized to analyzed only for oxygenated fuel additives di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), MTBE, tertiary amyl methyl ether (TAME) and tertiary butyl alcohol (TBA). Advanced GeoEnvironmental,Inc.