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05 March 2002 , AGE-NC Project No 98-0426 i Page 5 of 6 to be olive gray or green Sand layers tend to be thin and laterally discontinuous, except for an Iapproximately 20-foot sand localized along the western edge of the site and an approximately 2-foot sand zone, at about 15 feet bsg, covering the northeastern half of the site Saturated soil was first encountered in most borings at 25 feet bsg Boring logs and cross-sections A-A',B-B' and BC are included in Appendix A and in Figures 4 to a 10, respectively 32 FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL Organic vapor was not detected in any of the soil sample duplicates 3 3 GROUND WATER DEPTH AND GRADIENT Based on eight ground water monitoring events of three existing monitoring wells onsite, ground water depth is approximately 23 feet bsg, the ground water flow direction at the site is consistently northeasterly . - , ' 34 RESULTS OF SOIL SAMPLE ANALYSIS Select soil samples from probe borings P-8 and P-9, and soil borings-MW-4 and MW-5 were tsubmitted for laboratory'analysis, the concentrations of targeted analytes in all samples analyzed were below reporting limits Analytical results of soil samples are summarized in Table I The laboratory reports and chain-of-custody forms are presented in Appendix B 3 5 RESULTS OF GROUND WATER SAMPLE ANALYSIS A total of four grab ground water samples were submitted for analysis Toluene was detected in E ground water samples collected from P-7 and P-8,at a maximum concentration of 0 86 micrograms per liter (µg/1) in sample P-7-60 Ethylbenzene (12 }tg/l) and total xylenes (9 7 µg/l) were also detected in P-7-60 Utilizing EPA Method 8260, MTBE was detected in the two samples from P-8, at a maximum concentration of 12 µg11 The analytical results of water samples,are summarized in Table 2 The laboratory reports and chain-of-custody forms are included in Appendix B i Advanced GeoEnvironmental,Inc I