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1 ' 08 June 2001 AGE-NC Project No 95-0137 ' Page 5 of 9 2 8 MONITORING WELL PURGE PROCEDURES On I0 April 2001, a Solinst water level meter was used to measure the depth to ground water In ground water monitoring wells MW-1 through MW-5 The depths to ground water are summarized in Table 1 ' After ground water depth measurements were recorded, a minimum of three well casing-water volumes of ground water were purged from wells MW-1 through MW-5 All wells were purged using a pre-cleaned two-stage submersible pump Temperature,pH, and conductivity were measured at regular intervals using a Hydac water analyzer Purged water was stored on-site in 55-gallon drums The field data sheets are included in Appendix C 2 9 GROUND WATER SAMPLE COLLECTION After purging and allowing a minimum 80%recharge recovery of the initial water level in each well, samples were collected using new,clean, disposable plastic bailers Each sample was transferred into ' three 40-m1 EPA-approved volatile organic analysis (VOA) vials and into one 1-liter amber bottle Samples were stored in a chilled container and transported under chain-of-custody to MAI ' Each sample was analyzed in accordance with the following • TPH-g and TPH-d in accordance with EPA Method 8015 Modified, ' • BTEX compounds and MTBE in accordance with EPA Method 8020, • TBA, DIPS, MTBE, ETBE and TAME in accordance with EPA Method 8260 Modified ' 30 FINDINGS Hydrocarbon impacted soil was encountered during the drilling of pilot boring and well installation ' as quantified by the laboratory data ' 31 STRATIGRAPHY Tan silt and sand were encountered at the site Silt,with trace amounts of clay at increasing depths, ' was distributed in beds at 10 feet bsg and 15 feet bsg Silt and minor clay were encountered at 25 feet . bsg Silty sand or sand was encountered at depths of 15 feet bsg and 18 feet bsg (a stratigraphic cross section of the soil at the site is depicted in Appendix A) I Advanced Geolinvironmental,Inc