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cr • 06 March 2002 AGE-NC Project No 01-0865 Page 6 of 9 42 ANALYTICAL RESULTS OF SOIL SAMPLES A total of four soil samples were submitted for laboratory analysis,the15-and 20-foot samples from boring B5, also located near the former UST area, and the 15- and 25-foot samples from boring B7 TPH-g was detected in the soil samples collected from boring B7 at concentrations of 2,100 (milligrams per kilogram) mg/kg and 0 80 mg/kg BTEX compounds were detected in the 15-foot soil sample collected from borings B7 at concentrations of 22 mg/kg benzene, 130 mg/kg toluene, 40 mg/kg ethylbenzene and 190 mg/kg total xylenes Toluene was detected in the 25-Foot soil sample collected from boring B7 at a concentration of 0 03 mg/kg TPH-g and BTEX compounds were not detected at or above laboratory reporting limits in the soil samples collected from boring B5 Fuel additives were not detected at or above laboratory reporting limits in the soil samples Analytical results of soil samples are summarized in Table 3 The laboratory report(CTEL Lab I D 0112-145-7, 0112-145-8, 0201-087-4 and 0201-087-6) and chain-of-custody forms are included in Appendix B 43 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g was detected in the ground water sample collected from borings B1,B3,B4,B6,B7,B8,B9 and B-10 at concentrations ranging from 110 micrograms per liter(µg/1)to 23,000µg/l One or more BTEX compounds were detected in the samples collected from borings B3, B4, B6 and B7 at concentrations as high as 84 µg/1 benzene,200 µg/l toluene, 34µg/1 ethylbenzene and 160 µg/1 total xylenes (B7-30) MTBE was detected by EPA Method 8260B in the samples collected from borings B1,B4,B6,B7, B8 and B9 at concentrations ranging from 7 0 µg/1 (B7-30) to 20,000 µg/1 (B9-15) Other fuel additives were not detected at or above laboratory reporting limits in the ground water samples Analytical results of ground water samples are summarized in Table 4 The laboratory report(CTEL Lab I D 0112-112-1 through 0112-112-4,0112-145-1 through 0112-145-4,0201-087-1,0201-087-2 and 0201-086-7 through 0201-086-11) and chain-of-custody forms are included in Appendix B 5.0. SITE MODEL The UST case at Herman and Helen's Marina has been closed as the MTBE plume east of the former UST area has been interpreted by others to be related to an undocumented AST release rather than the known UST release The apparent reason for attributing the MTBE portion of the plume to the ASTs are the close proximity of the ASTs to the more intensely MTBE-impacted portion of the plume and the low MTBE concentrations detected in ground water samples collected from MW-4, located upgradient of the ASTs and in close proximity and down-gradient of the former UST pit