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21 February 2000 <br /> AGE-NC Project No. 95-0185 <br /> Page 6 of 8 <br /> t The laboratory report (A. Keith Kaufman report dated 12 August 1999 Shockey and Sons]) and <br /> chain-of-custody form are included in Appendix F. <br /> 4.3. STRATIGRAPHY/HYDROGEOLOGY <br /> ' Silty clay was encountered from a depth of approximately 10 feet to 12 feet bsg. Gray silty sand was <br /> distributed at depths between approximately 12 feet and 20 feet bsg. A second layer of silty clay was <br /> encountered from a depth of approximately 20 feet to 30 feet bsg. Gray silty sand was encountered <br /> ' at depths between approximately 30 feet and the total depth of the soil boring at 35 feet bsg. A soil <br /> boring is depicted in Appendix B. A stratigraphic cross section is depicted in Figure 4. <br /> ' 4.4. HYDROCARBON-IMPACTED SOILIMICROBIOLOGICAL ACTIVITY <br /> ' A total of five soil samples were analyzed for TPH-g, TPH-d and BTEX, with analysis for five fuel <br /> additives by EPA Method 8260 Modified. Three soil samples were analyzed for physicochemical <br /> properties and microbiological enumeration. <br /> • TPH-g was detected in three soil samples analyzed at concentrations as great as 350 <br /> ' milligram per kilogram (mg/kg) in soil sample P10-20'. <br /> • TPH-g was detected in soil from 15 feet and-25 feet bsg at concentrations of 160 mg/kg and <br /> 14 mg/kg, respectively. TPH-g was not detected in soil samples collected at a depth of 30 <br /> ' feet or 35 feet bsg. <br /> • TPH-d was detected in soil samples collected from a depths of 15, 20 and 25 feet bsg at <br /> ' concentrations of 5,100 mg/kg, 13,000 mg/kg and 490 mg/kg, respectively. TPH-d was not <br /> detected in soil collected-at a depth of 30 feet bsg or.below. <br /> • Neither BTEX compounds nor oxygenated compounds were detected in the five soil samples <br /> ' analyzed. <br /> Laboratory results of soil samples analyzed for petroleum hydrocarbons are summarized in Table 4. <br /> Copies of the laboratory reports(MAI Laboratory ID 12447 to 12472), quality assurance and quality <br /> control (QA/QC) reports and chain-of-custody form are included in Appendix E. <br /> -.Analytical results.- of-soil-.samples -submitted--for==physicochemical ,,analysis =and - <br /> microbiological enumeration indicate that there were no measurable petroleum bio- <br /> degradeing microbe activity in soil at depths of 15 feet or 20 feet bsg. Low populations of <br />' biodegrading bacteria were present at 25 feet bsg in the soil sample analyzed (0.8 <br /> CFUX103/gr). <br />' •` Adequate concentrations of necessary nutrients for microbe growth and minimal sustenance <br /> Advanced GeoEnvironmentai,Inc. <br /> 1 . <br />