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1 r ` 24 October 1997 AGE-NC Project No 96-0235 Page 8 of I 1 _ elevations are tabulated in Table 3 - Ground Water Elevation After recording water level measurements, a two-stage submersible pump was used to purge the I monitoring wells of standing water A minimum of three well volumes of water were removed from each well twenty gallons of water were removed from MW-1, MW-2 and MW-3, eight gallons of water were removed from MW-4 and MW-5 Ground water temperature,pH and conductivity were measured at four-gallon intervals for MW-1, MW-2 and MW-3, and at one-gallon intervals for MW- 4 and MW-5 using an ICM water analyzer These parameters fairly well stabilized by the conclusion of the purging procedures (see Appendix E) Purged water was stored on-site in labeled, 55-gallon ' DOT-approved drums 10 2 COLLECTION OF GROUND WATER SAMPLES I Water samples were collected from Each well using a new disposable plastic bailer Each water sample was transferred into three 40-m1 VOA vials containing 0 5 ml of 18% hydrochloric acid as a sample preservative and into two I-liter amber bottles without preservative After collection, the samples were properly labeled,placed in a chilled container and transported under chain-of-custody to MAI Each sample was analyzed for TPH-g, TPH-d, TPH-mo, O&G, BTE&X and MTBE Analytical methods utilized are noted on the laboratory report in Appendix C r 10 3 FINDINGS 103 1 GROUND WATER GRADIENT AND FLOW DIRECTION The relative elevation of ground water in each well was calculated by subtracting the-ground water depth from the relative casing elevations of MW-2 through MW-5 corrected to the surveyed casing ' elevation of MW-1 (Table 1) The casing elevation of MW-1 and MW-3 had been previously surveyed relative to a bench mark Monitoring well MW-2 had previously been surveyed, but the casing was cut shorter during grading on the site Ddpths to ground water ranged from 20 53 feet to 21 85 feet below the well casing Ground water ' elevations at the site ranged from -19 39 feet in MW-4 to -17 73 feet in MW-2 The ground water flow direction for 27 May 1997, was complex, as a trough of lower elevation ground water cuts diagonally, northwest/southeast across the property due to the low in MW-2, causing all flow directions on the property to be toward MW-2 If the trough continues northwestward, then the' overall flow direction may also be toward the northwest The contoured ground water flow elevations for this ground water monitoring event are depicted in Figure 6 - Ground Water Elevation 27 May 1997 - Advanced GeoEnvironmentel,Inc