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i01 July 2004 • AGE-NC Project No 02-0950 ' Page 3 of 4 During this monitoring event, the ground water levels in the wells were at least five feet below the ' tops of the well screens, Indicating that the wells are screened properly to yield representative shallow ground water samples ' Ground water flow was Inferred to be flowing towards the north-northeast with an average hydraulic gradient of 0 022 foot/foot,the direction is consistent with the previous monitoring events while the ' gradient steepened slightly Figure 3 illustrates the contoured ground water elevations as measured on 21 January 2004 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES ' TPH-g and TPH-d were detected in the water sample collected from well MW-2 at concentrations of 17,000 micrograms per liter (µg/1) and 5,900 µg/1, respectively ' Various BTEX compounds were detected In the water samples collected from wells MW-2 and MW-3 at maximum concentrations of 580µg/1 benzene,4,500µg/1 toluene,2,800µg/1 ethylbenzene and 10,000 µg/1 xylenes, all from sample MW-2 No other analytes were detected at or above laboratory reporting limits in the ground water samples analyzed The analytical results of the ground water samples collected on 21 January 2004 are ' summarized on Table 2 The laboratory report (CTEL Lab Project No CT214-0401130), QA/QC report and chain-of-custody form are Included in Appendix D 4.0. SUMMARY AND CONCLUSIONS ' Based on the data collected from the site, AGE concludes • TPH-g and TPH-d were detected in sample MW-2, the TPH-g concentration Increased sharply since the last monitoring event and TPH-d was detected for the first time • Various BTEX compounds were detected in the water samples collected from well MW-2 ' and MW-3 High concentrations of BTEX were detected in MW-2 and were all above each constituents respective DHS maximum containment levels(MCL),the detections in MW-3 ' were below their respective MCLS • Ground water appears to be defined toward the northeast,down gradient,but not in any other direction ' Advanced GcoEnvironmental,Inc