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I <br /> I <br /> 30 October 2000 <br />' AGE-NC Project No 99-0624 <br /> Page 7 of 8 <br />' 4 3 GROUND WATER DEPTH AND GRADIENT <br />' Based on field data collected onsite, ground water depth is approximately 50 feet bsg The regional <br /> ground water flow direction is inferred to be southerly <br /> 4 4 RESULTS OF SOIL SAMPLE ANALYSTS <br />' Select soil samples from probe borings P1,P2, and soil borings MW-1,MW-2,MW-3, and MW-4 <br /> were submitted for analysis for TPH-g,BTEX and MTBE The laboratory results reported TPH-g <br /> and BTEX compounds in sample MW-2-45'at concentrations as high as 3 0 mg/kg and 0 82 mg/kg, <br />' respectively MTBE was detected at a maximum concentration of 3,800 gg/kg in soil sample P 1-25' <br /> .Analytical results of soil samples are summarized in Table 2 The laboratory reports and <br /> chain-of-custody forms are presented in Appendix B <br /> I <br /> 4 5 RESULTS OF GROUND WATER SAMPLE ANALYSIS <br />' A total of fiveb ground water samples were submitted to DHS-certified lab for <br /> � �' P analysis <br />' TPH-g was detected in ground water samples collected from P1,MW-1,MW-2,MW-3,and MW-4 <br /> at concentrations as high as 1,500 micrograms per later(µg/l) in sample P1-W <br /> Benzene was detected at a concentration of 690 µg/1 in the grab ground water sample collected from <br /> P 1 <br />' Utilizing EPA Method 8260,MTBE was detected in grab ground water sample P 1-W collected from <br /> P 1 at a concentration of 420 µg/1 <br />' The analytical results of water samples are summanzed in Table 3 The laboratory reports and <br /> chain-of-custody forms are included in Appendix B <br />' 5.0. SUMMARY AND CONCLUSIONS <br /> I Based on data collected dunng the pre-UST removal investigation on 09 March 1998, the UST <br /> removalsampling on 30 June 1998,the 23 September 1999 soil probe borings and grab groundwater <br /> sampling, and during the 04 and 05 November 1999 monitoring well installation,AGE concludes <br />' The most intense hydrocarbon-impacted and MTBE-im acted soil as in the area of borings <br /> . p <br />' P1,MW-3, and MW-2 at depths as great as 55 feet,20 feet, and 45 feet bsg,respectively, as <br /> Advanced GeoEnvaonmentaa,Inc. <br />