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06 March 2002 AGE-NC Project No. 99-0641 Page 5 of 6 Hydrocarbon odor was not observed in the soil samples from the borings. Organic vapor was not _ detected in the soil samples collected from boring SB-1. Organic vapor field measurements are included on the boring logs in Appendix A. 4.2. ANALYTICAL RESULTS OF SOIL SAMPLES A total of two soil samples were submitted for laboratory analysis, the15 and 25-foot samples from boring SB-l. Volatile organic compounds were not detected at or above laboratory reporting limits in the soil samples. Analytical results of soil samples are summarized in Table 1. The laboratory report (MAI Lab I.D. Nos. 89606 and 89607) and chain-of-custody are included in Appendix B. 4.3. ANALYTICAL RESULTS OF GROUND WATER SAMPLES Chloroform and PCE were detected in the water sample collected from SB-1 at concentrations of 2.0 gg/l and 1.6 ug/i, respectively. Additional volatile organic compounds were not detected at or above laboratory reporting limits in the ground water sample.Analytical results of ground water samples are summarized in Table 1.The laboratory report(MAI Lab I.D.No. 89608)and chain-of-custody fon-ns are included in Appendix B. 5.0. SUMMARY AND CONCLUSIONS — Based upon data collected during this subsurface investigation, AGE concludes the following: • Road base was encountered from surface grade to approximately 7 feet bsg. Light brown to dark gray, damp, silty clay was encountered at 10 feet, 20 feet, 25 feet and 30 feet bsg. Reddish brown,damp, sandy silt was encountered at 15 feet bsg and light brown,damp,silty sand was encountered at 21 feet bsg. • Volatile organic compounds were not detected at or above laboratory reporting limits in the soil samples collected from boring SB-1. • Chloroform and PCE were detected in the water sample collected from SB-1 at concentrations of 2.0 µg/l and 1.6 pg/I, respectively. The State of California Safe Drinking — Water Standards has set a maximum contaminant level(MCL)of 5.0 gg/1 for PCE in ground water. The concentration of PCE detected in the water sample is below the State of California MCL. .9daficed GeoEnvironmcntal,❑ic.