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15 March 2003 <br /> • AGE-NC Project No 98-0534 <br /> Page 3 of 3 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-d was not detected in the any of the ground water samples TPH-g was detected in the ground <br /> water samples collected from wells MW4 and MW6 at concentrations of 160 µg/1 and 110 gg/l, <br /> respectively BTEX compounds were not detected in any of the ground water samples <br /> IMTBE was detected in samples MW4 and MW6 by EPA method 8021B at 12u�3 ug/1 and <br /> were reconfirmed with EPA method 8260B at 19 ug/1 and 18 ug/l, respectively No other fuel <br /> oxygenates were detected in any of the samples The current and historical ground water analytical <br /> results are summarized on Table 2 The laboratory report(CTEL Project No CT214-0301092) and <br /> chain-of-custody form are included in Appendix B <br /> I <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the findings from this investigation, AGE concludes <br /> I . 0 A ground water ridge is present in the former UST area with water flowing to the northeast <br /> and southwest at low hydraulic gradients This is consistent with previous monitoring events <br /> I O The dissolved TPH-g and MTBE plumes are currently delineated by the existing well <br /> network In general, the TPH-g and MTBE concentrations have shown stable to decreasing <br /> trends when compared to previous monitoring events <br /> I <br /> 5.0. RECOMMENDATIONS <br /> Based on the stable to decreasingconcentrations of TPH- and MTBE in the ground water, AGE <br /> g <br /> recommends continued quarterly ground water monitoring at the site <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> I environmental consultants practicing in this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluation of the hydrogeologic <br /> conditions at the site has been made from a limited number of available data points(I a monitoring <br /> well ground water samples) and subsurface conditions may vary away from these data points No <br /> other warranty, expressed or implied, is made as to the professional interpretations, opinions and <br /> recommendations contained in this report <br /> I <br /> Advanced GeoEnvironmental,Inc <br /> I <br />