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1 , <br /> ' 15 January 1997 <br /> AGE-NC Project No x 95-013 7 <br /> ' Page 4 of 6 <br /> grained sand throughout the entire profile Saturated soil conditions were encountered in all borings <br /> ' at a depth of approximately 20 feet bsg <br /> 32 LABORATORY RESULTS OF SOIL SAMPLES <br /> 1 TPH-g and TPH-d were detected in three of eight soil samples analyzed(B 14-20', B 15-10' and B 15- <br /> 20'),at concentrations ranging from 14 to 1,700 parts per million(ppm, reported as milligrams per <br /> kilogram) Toluene, ethylbenzene and xylenes were detected in the same three samples at <br /> concentrations as high as 12 ppm Neither benzene nor MTBE were detected in the soil samples <br /> ' analyzed <br /> ' Analytical results from the soil samples analyzed are summarized on Table i -Analytical Results <br /> of Soil and Grab Ground Watei Samples, 30 October 1996 The laboratory report (MAI Laboratory <br /> ID 70755 through 70765) and chain-of-custody are in Appendix B <br /> } <br /> Microbiological analysis of soil samples indicated that indigenous hydrocarbon-degrading bacteria <br /> constitutes a reasonable proportion of the total microbiological population at the site, however, the <br /> total microbiological population is low The low concentrations of the microbiological population <br /> at the site may be due to the elevated soil pH,the high level ofpotassium and the low concentrations <br /> ' of nitrogen possible Nitrate as N, and more likely Ammonia as N, and Ammonia <br /> The total colony units (CFU) of the bacteria and the chemical composition of the soil at the site <br /> ' appears to be inadequate for bioremediation, without the inoculation of additional microbes and <br /> nutrients Results of the microbiological and physicochemical analysis are included in Appendix C <br /> ' 3 3 LABORATORY RESULTS OF GRAB GROUND WATER SAMPLES <br /> ' TPH-g was detected in grab ground water samples collected from B 14 and B 16 at concentrations <br /> of 2 400 and 130 parts per billion (ppb, reported as micrograms per liter), respectively, and TPH-d <br /> was detected in the same samples at concentrations of 5,400 ppb and 990 ppb TPH-d was also <br /> ' detected in B 17 at 210 ppb Toluene and ethylbenzene was detected in B 14 at 1 1 ppb and 0 94 ppb, <br /> respectively Xylenes were detected in B 14 and B 16 at 5 3 ppb and 0 97 ppb, respectively Neither <br /> benzene nor MTBE were detected in any of the grab ground water samples Analytical results of <br /> grab water samples are included in Table 1 The laboratory report (MAI Laboratory ID 70755 <br /> through 70757) and chain-of-custody form are presented in Appendix B <br /> 1 <br />