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I14 February 2000 • AGE-NC Project No 96-0254 Page 7 of 10 • TPH-g was detected in one of the fifteen soil samples analyzed TPH-g was detected at a concentration of 940 milligram pre kilogram (mg/kg) in soil sample MW4-5 • TPH-d was detected in one soil sample at a concentration of 270 mg/kg (MW4-5) • BTEX compounds were detected in three of the fifteen soil samples analyzed The greatest concentration of BTEX compounds was detected in soil sample MW4-5 BTEX compounds I were not detected in the former UST area at depths below 24 feet bsg, while BTEX compounds were detected at depths of 10 and 15 feet south of the former dispenser area IOxygenated fuel additives were not detected the soil samples analyzed Laboratory results of soil samples analyzed for petroleum hydrocarbons are summarized in Table 3 ' The laboratory reports (MAI Laboratory ID 25117 to 25128 and 26264 to 26268), quality assurance and quality control (QA/QC) reports and chains-of-custody are included in Appendix E I 33 PHYSICOCHEMICAL AND MICRO-BIOENUMERATION • Analytical results of soil samples submitted for physicochemical analysis and microbiological enumeration indicate that petroleum bio-degrading microbe activity at the site was low The reduced population 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 08 December 1999) and chain-of-custody form are included in Appendix F ' 3 4 HYDROCARBON-IMPACTED GROUND WATER IA total of three grab water samples were collected in November 1999 from the site in the soil probe boring established After the installation of the two additional ground water wells on the site, all ' seven ground water monitoring wells were sampled Each sample was analyzed for TPH-g, TPH-d and BTEX and each sample was analyzed for the suite of five, oxygenated fuel additives 3 4 1 Grab Water Samples • water samples collected from the site at ' TPH-g was detected in the three grab ground p concentrations ranging from 1,I00 micrograms per liter (,ug/l) to 100,000 ktgll TPH-d was Advanced CeoEnironmentai Inc I