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! S <br /> 27 September 1999 <br /> AGE-NC Project No 95-0167 <br /> Page 8 of 9 <br /> samples at maximum concentrations of 9,600 µg/l <br /> MTBE was detected by EPA Method 8260 Modified in samples collected from wells MW-i and <br /> MW-2 at concentrations of 330 µg/l and 11 ug/l, respectively <br /> Analytical results of ground water samples are summarized in Table 3 and Table 4 The laboratory <br /> report(MAI Laboratory Sample No 16336 to 16339), QA/QC report and chain-of-custody form are <br /> included in Appendix D <br /> 6.0. SUMMARY AND CONCLUSIONS <br /> Data collected at the site Indicates that <br /> • The ground water flow direction Inferred from data collected during this monitoring event <br /> is toward the east <br /> . Relatively high concentrations of TPH-g and BTEX occur in ground water In the area of <br /> MW-1 and MW-2 <br /> • MTBE is present In ground water at concentrations as high as 330,ug/l (sample MW- 1) <br /> • TPH-g was not present In ground water at the western edge of the building on the site or at <br /> the northern boundary of the site, however, low concentration of BTEX compounds impact <br /> ground water In these locations <br /> 7.0. RECOMMENDATIONS <br /> Based on present site conditions, AGE recommends <br /> • Quarterly monitoring and sampling should continue at the site <br /> • The next quarterly monitoring event should be scheduled for September 1999 On <br /> completion of one-year of monitoring the ground water monitoring well network, closure <br /> criteria for the site should be determined If warranted by the data <br /> Adtiat+ced GeoEniron mental,Inc <br />