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.13 December 1999 ; AGE-NC Project No. 980433 . .. Page 9of13 MW1-30 were 1,800 Mg/kg, 830 Mg/kg and 340 Mg/kg, respectively, as quantified by EPA " Method 8260. • TBA was detected in four soil samples analyzed. Soil near the former UST area at.a depth . of 10 feet bsg contained the greatest concentration of TBA at 15,000 Mgpkg. The concentration of TBA decreased with depth (20'),in soil boring B 1 to a concentration of 120 gg/kg and to concentration of 28 Mg/kg at 30 feet bsg in soil boring B L. ' TBA was detected in soil at a depth of 25 feet bsg at the northwest corner of the former UST area. Yet TBA was not detected in soil collected from boring B2 at 30 feet bsg; in soil boring B5 at 25 feet bsg or in soil boring B6 at 25 feet bsg. ; Laboratory results.of soil samples analyzed for petroleum hydrocarbons are summarized in Tables 2 and.3. The laboratory reports (MAI Laboratory ID' 12447 to 12472 and 1.7920 to 17931), quality assurance and quality control (QA/QC) reports and chains-of-custody are included in Appendices D and E. 4.3. PHYSICOCHEMICAL AND MICRO-BIOENUMERATION Soil Analy sis ' Analytical results of soil samples submitted for physicochemical analysis and microbiological enumeration indicate that there were no measurable petroleum bio-degrading microbe activity at the site. The lack of biodegrading bacteria may be due to the presence of biotoxic.compounds in the. ; subsurface at the site, such as metals, caustic materials(salts)or pesticides. Adequate concentrations of necessary nutrients for microbe growth and minimal sustenance were present in the soil at the site, however.the pH of the soils analyzed were above the optimal ranges for microbial growth. The microbiological laboratory report (A. Keith Kaufman report dated 18 June.1.999) and chain-of- custody form are included in Appendix F.- Ground .-Ground Water Analysis A water sample from well MW-1 was analyzed for bio-enumeration and physicochemical characterization by A. Keith Kaufman, M.S. The water sample was found'to have concentrations of inorganic components sufficient to support a microfauna for bioremediation. Nitrogen, potassium and phosphates was at sufficient levels to support a microfauna for bioremediation for undetermined time period. The water sample had ' significant microbiological populations as biodegraders as compared to the general concentration Advanced GcoEnvironmental,Inc.