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25 April 2005 • AGE-NC Protect No 00-0696 ' Page 3 of 4 ' in ground water elevation of approximately 0 29 feet since the last monitoring event in November 2004 ' During this monitoring event, the ground water levels in wells MW-1 through MW-4 were as high as 1 18 feet above the tops of the well screens, indicating that the wells may not yield accurate data representative of shallow ground water conditions However, during the purge cycle, the depth to water was reduced to a level within the well screens, thus recharging the wells with water from the screen area exposed to the surrounding sediments and water-bearing layers Ground water at the site was inferred to be flowing in a north-northeast plunging trough under hydraulic gradients of approximately 0 01 foot/foot(ft/ft)or less Figure 3 illustrates the contoured ground water elevations as measured on 28 February 2005 I 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH- was detected in the round water sample collected from well MW-3 at a concentration of g g p 560 micrograms per liter (µg/1) BTEX compounds were detected in the ground water sample collected from well MW-3 at the following concentrations 7 3 µg/1 benzene, 27 4g/1 toluene, 26 µg/1 ethylbenzene, and59 µg/1 total xylenes No other analytes were detected at or above laboratory detection limits in the ground water samples analyzed The analytical results of the ground water samples collected on 28 February 2005 are summarized in Table 2 The laboratory report (CTEL Project No CT214-0503006), quality assurance/quality control (QA/QC) report, and chain of custody form are included in Appendix D Documents confirming the upload of laboratory electronic deliverable format(EDF)files and depth to water measurements to GeoTracker are included in Appendix E 4.0. SUMMARY AND CONCLUSIONS Based on the data collected from the site, AGE concludes IOn 28 February 2005, depths to ground water ranged from 3 82 feet to 4 97 feet below the tops of the well casings Ground water elevation at the site ranged from 16 58 feet to 17 29 feet below MSL, and averaged approximately 16 81 feet below MSL, indicating an increase in ground water elevation of approximately 0 29 feet since the last monitoring event in November 2004 • Ground water at the site was inferred to be flowing in a north-northeast plunging trough under hydraulic gradients of approximately 0 01 ft/ft or less Advanced GeoEnvironmental,Inc