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' 03 December 2004 AGE-NC Project No 95-0128 Page 3 of 4 3 2 ANALYTICAL RESULTS OF MONITORING WELL GROUND WATER SAMPLES TPH-g was detected in ground water samples VW-1,MW-4,MW-5 and MW-11A at concentrations of 29,000 micrograms per liter (µg11), 200 µg/1, 340 µg/l and 130 µg11, respectively TPH-d was detected only in sample VW-1 at a concentration of 11,000 µg/1 BTEX compounds were detected in sample VW-1 at concentrations of 500µg/1 benzene,2,400µg/1 toluene,2,300µg11 ethylbenzene and 13,900µg/1 total xylenes In addition,ethylbcnzene and xylenes were detected in sample MW-4 at concentrations of 4 2 µg/1 and 4 3 µg/l, respectively MTBE was detected in groundwater samples VW-1,MW-2,MW-4,MW-5,MW-11 A and MW 11B at concentrations ranging from 12 µg/1 in MW-11B to 230 µg11 in VW-1 No additional target analytes were detected at or above laboratory reporting limits in the samples analyzed The analytical results are summarized in Tables 2 and 3 The laboratory report (CTEL Project No CT214-0411003), including quality assurance/quality control (QA/QC) and chain of custody forms for the quarterly monitoring event are included in Appendix C Documents confirming • the upload of laboratory electronic deliverable format(EDF)files and depth to water measurements to GeoTracker are included in Appendix D 4.0. SUMMARY AND CONCLUSIONS The following conclusions were drawn from the results of this quarterly investigation • Ground water elevations measured during the October 2004 monitoring event ranged between 23 46 feet to 26 64 feet below MSL The depth to ground water increased an average of 2 7 feet since the last ground water monitoring event The site ground water flow direction was inferred to be east-northeast towards an apparent east-plunging trough in the Iwater table • TPH-g was detected in ground water samples VW-1, MW-4, MW-5 and MW-11A, the highest concentration was reported in sample VW-1 at 29,000 µg/1 In addition, TPH-d was detected only in sample VW-1 at a concentration of 11,000 [.g/l • BTEX compounds were detected only 1n samples VW-1 and MW-4 The BTEX concentrations in sample VW-1 were all above the DHS' Maximum Contaminant Levels (MCLS) in drinking water • MTBE was detected in ground water samples VW-1,MW-2, MW-4,MW-5,MW-I IA and M W 11 B,the highest concentrations( 200µg/1)were detected In samples VW-I and MW-5 All of the detectable MTBE concentrations exceeded the primary or secondary MCL for Advanced GeoEnvironmental Inc I