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i ' 22 April 2002 AGE-NC Project No 98-0511 Page 6 of 7 BTEX compounds were detected In MW-1 at concentrations of 420 µg/1 benzene,310 gg/1 toluene, 560 µg11 ethylbenzene and 2,700 gg/l total xylenes, Ethylbenzene and toluene were detected in MW-2 and MW-5, the maximum concentrations (3 8 gg/l ethylbenzene and 3 2 gg/1 xylenes)were detected in MW-5 Toluene (1 4 µg/1) was detected in the sample from MW-8 BTEX compounds were also detected in B-9-25 and B-9-50, the maximum concentrations (1,900 µg/1 benzene, 2,200 gg/l toluene, 2,700 gg/1 ethylbenzene and 20,000 gg/l xylenes) were detected in the sample from B-9-25 MTBE was detected in the ground water samples collected from MW-1, MW-3 and MWr5 at concentrations of 200 gg/l, 15 µg/1 and 240 gg/1 respectively No other fuel oxygenated compounds were detected at concentrations above laboratory reporting limits Analytical results of ground water samples are summarized on Table 3 Maps showing the lateral distribution of TPH-g, benzene, ethylbenzene, xylenes and MTBE are provided in Figures 10 ' through 12 Copies of the laboratory report(Cal Tech Laboratory ID 0112-002-8 through-10,0111- 163-7 and -8, and 0112-115-1 through-8) and chain-of-custody forms are 1n Appendix B 4.0. SUMMARY AND CONCLUSIONS ' Based upon data collected from the site, AGE concludes the following ' • The soil profile consisted of four soil units separated by thin clay layers, Units 1 and 3 are dominantly sand layers, whereas Units 2 and 4 are predominantly silt • TPH-g was detected In soil samples from soil boring B-9, no other analytes were detected ' in soil samples collected from soil borings B-5,B-6 or B-9 TPH-g is defined vertically,but laterally is not defined along the east side of the site ' • On 27 December 2001 the ground water elevation in the monitored area averaged 3 22 feet above mean sea level, ground water has risen approximately 2 0 feet since the previous quarter The ground water flow direction was inferred to be generally northwestward under a gradient ranging from 0 002 ft/ft to 00 0'03" ft/ft • TPH- concentrations eater than 12,000 mg/kg and BTEce trations greater than 300 g mg/kg were detected in groundwater samples from B-9 and MW- ocated along the eastern and southeastern margins of the site Lower concentra sof TPH-g (600 mg/kg), ethylbenzene (3 2 mg/kg) and xylenes (3 2 mg/kg) were detected in the water sample from ' MW-5 Advanced GeoEnvi ron mental,Inc 1