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' 21 January 1999 AGE-NC Project No 98-0450 Page 6 of 8 ' to depths of 25 feet bsg Benzene was detected in soil boring SB5 at a depth of 25 feet bsg TPH-g was detected at a maximum concentration of 1,800 mg/kg in sample S135-15 Benzene was detected in soil sample SB5-25 at 0 021 mg/kg TPH-d was detected in the same soil sample at a concentration of 1 7 mg/kg TPH-g, TPH-d and BTEX compounds were not detected in the soil sample collected from a depth of 40 feet in soil boring S135 ' • TPH-g and BTEX compounds were detected in analyzed soil boring S136 soil samples from depths of 20 feet bsg to depths of 35 feet bsg TPH-g was detected at a maximum concentration in this soil boring at 1,000 mg/kg in sample SB6-30 Benzene was detected in ' same soil sample at 6 7 mg/kg TPH-d was detected in soil sample SB6-35 at a concentration of 68 mg/kg TPH-g and BTEX compounds were not detected in the soil sample collected from a depth of 40 feet bsg in soil boring SB6 ' • TPH-g and BTEX compounds were not detected in soil boring SB7 from depths of 30 feet bsg to depths of 45 feet bsg ' • TPH-g and BTEX compounds were not detected in soil boring BMW3 at depths of 25 feet bsg to depths of 45 feet bsg • TPH-g were not detected in analyzed soil samples collected from soil boring BMW5 Toluene and xylene were detected in one soil sample from BMW5 at a depth of 45 feet bsg at concentrations of 0 008 mg/kg and 0 007 mg/kg, respectively BTEX compounds were ' not detected in the other analyzed soil samples from BMW5 • MTBE was detected in soil samples from SBI, S134, SB5, SB6 and SB7 The highest concentration, 9,200 jig/kg, was detected at a depth of 30 feet bsg in the former UST area in soil boring SB4 ' • TBA was also detected in soil borings S134, S135 and SB6 Again the highest concentrations of this fuel additive NA as encountered in soil boring S134, located in the former UST area • DIPE, ETBE, TAME and ethanol were not detected in any of the analyzed soil samples ' collected from the site Laboratory results of soil samples analyzed are summarized in Tables 1 and 2 The laboratory reports (MAI Laboratory ID 98041 to 98048 and 98050 to 98075), quality assurance and quality control (QA/QC) reports and chain-of-custody form are included in Appendix B A stratlgraphic cross section of soils at the site with analytical results of soil samples is depicted in Figure 3 ' Analytical results of soil samples submitted for physicochemical analysis and microbiological s ' enumeration indicate that there were no measurable 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 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 Adianced CeoEnNironmental,Inc