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' 08 August 2004 AGE-NC Project No 95-0128 Page 3 of 4 I3 2 ANALYTICAL RESULTS OF MONITORING WELL GROUND WATER SAMPLES TPH-g was detected in ground water samples MW-4, MW-5, MW-11A and MW-15 at concentrations of 760 micrograms per liter(µg/1), 5,500 µg/1, 210 µg11 and 120 µg11, respectively TPH-d was not detected in any samples Various BTEX compounds were detected in samples MW-4 and MW-5 at maximum concentrations of 680 µg/1 benzene, 850 µg/1 ethylbenzene and 1,100 µg/1 total xylenes all from sample MW-5, toluene was not detected MTBE was detected in ground water samples MW-2, MW-4, MW-5, MW-11A, MWllB and MW--15 at concentrations ranging from 12 µg/1 in MW-11B to 680 µg/1 in MW-5 ' No additional target analytes were detected at or above laboratory reporting limits in the samples I analyzed The analytical results are summarized in Tables 2 and 3 The laboratory report (CTEL Project No CT214-0407079), 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 lie to GeoTracker are included in Appendix D I 4.0. SUMMARY AND CONCLUSIONS The following conclusions were drawn from the results of this quarterly investigation • Ground water elevations measured during the July 2004 monitoring event ranged between 21 86 feet to 23 92 feet below MSL The depth to ground water increased an average of 12 feet since the last ground water monitoring event The ground water flow direction was determined to be east to northeast, which is similar to the flow directions determined in previous monitoring events • TPH-g was detected in ground water samples MW-4 and MW-5 located within the northeastern portion of the site and in off-site wells MW-11 A and MW-15 located northeast F+l,� +o "T�,. ,,,� �TT1Y i .10+0.,+0 1 a +o,- �.,. —1— A4AXT A A Vl LlllJ sill+ Y al1V 11J iJ iL1i VVi11pV[A11LL�7 YYrere LLVLLli L1iLL 111 g~LVunLL YYµ4l1 �][Allli/1 Viz lYl YT-T (111LL MW-5, the highest concentrations were detected in sample MW-5 The benzene concentrations detected in samples MW-4 and MW-5 were above the DHS' Maximum Contaminant Level (MCL) in drinking water • IAdvanced CeoEnvironmental Inc