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I <br /> r <br /> r � I <br />' 04 February 2004 <br /> . AGE-NC Project No 98-0534 <br /> Page 3 of 3 _ <br /> r <br /> r <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-d was not detected in the ground water samples collected from wells TPH-g was detected in <br /> the ground water samples collected from wells MW-4 and MW-6 at concentrations of 90 <br />' micrograms per liter (µg/1) and 120 µg/l, respectively BTEX compound were not detected in the <br /> ground water samples MTBE was detected by EPA Method 8260 in the samples from wells MW-4 <br /> and MW-6 at concentrations of 10 µg/1 and 72 µg/l, respectively No other fuel oxygenates were <br /> detected In any of the samples The current and historical ground water analytical results are <br /> summarized on Table 2 The laboratory report (CalTech laboratory ID No 0311001), chain-of- <br /> custody <br /> hain-ofcustody form and the laboratory QA/QC report are Included in Appendix B <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the findings from this Investigation, AGE concludes <br />' 0 Ground water on the site was flowingawn from the UST area southwest at a low hydraulic <br /> Y Y <br />' gradient of approximately 0 002 feet/feet <br /> ® Dissolved benzene and MTBE in shallow ground water are delineated by the well network <br /> • MTBE was detected in two ground water samples collected by EPA 8260, with the highest <br /> dissolved concentration occurring within the former UST area at 72 µg/l <br />' 5.0 RECOMMENDATIONS <br />' AGE recommends conducting a final ground water monitoring and preparing a closure summary <br /> report <br /> r , <br /> 6.0. LIMITATIONS <br />' Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> 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 />' Advanced GeoEnvironmental,Inc <br />