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arl !4i> • 18 June 1997 AGE-NC Project No. 95-0109 Page 4 of 6 appear to be MTBE, but may be another chemical reported in this range due non-specific identification of the analytical method. Analytical results of ground water samples are summarized on Table 4. The laboratory report (MAI Laboratory I. D. Nos. 77419 through 77425) and chain-of-custody forms are included in Appendix B. 3.4. STRATIGRAPHY Organic vapor was detected in probing P-20 at concentrations as high as 794 part per million volume (ppmv) and in probing P-21 at concentrations up to 698 ppmv. Alternating sandy silt and silty sand were prominent in both probings. Medium to coarse sand was encountered at a depth of 55 feet bsg in probing P-21. Ground water was encountered at a depth of 55 feet bsg in probing P-21. Boring logs are included in Appendix C. 3.5. MICROBIOLOGICAL ACTIVITY IN SOIL Plate counts from the three samples from probing P-20 indicated that total populations of microorganisms at depths of thirty and at forty feet in depth are low overall. However a selected population of microbes of 0.04 X 105 cfu/g were observed at a depth of thirty feet and a population of 0.004 X 105 cfu/g were observed at forty feet in depth. No select population or percentage of biodegraders were noted at a depth of fifty feet. Plate counts from probing P-21 samples did not detect a general type of microbe, yet the plate count indicated that selected microbes were present in the soils from P-21. A count of 0.004 2 X 105 cfu/g were observed both the samples analyzed from P-21. Very low or not detectable general and selective microbial population were present in three of the five samples analyzed. Therefore, a percentage of biodegraders was not determined. The laboratory results for soil samples are summarized on Table 5. The laboratory reports and chain-of-custody forms are included in Appendix D. 3.6. NITRATE, AMMONIUM, PHOSPHATE, POTASSIUM AND pH CONCENTRATIONS IN SOIL • Five soil samples were submitted for analysis of nitrate, ammonium, phosphate and potassium Advanced GcoEnvironmental,Inc.