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R in the soil sample collected at the groundwater interface. MTBE was detected in only one boring, SB2, by EPA method 8020. However, MTBE was not detected in the SB2 sample by EPA method 8260 as a confirmation indicatingthis may be a false y positive result. r.. As part of the analysis of soil samples. for geophysical parameters, soil samples from borings SB3 and SB6 were analyzed for percent organic matter (carbon), nitrogen and phosphorus. Results indicate percent organic matter ranging from 19 percent (SB3-8.5) to 23 percent (S136- 14.5), nitrogen ranging from 0.009 percent (SB6-15) to 0.02 percent (SB3-8.5), and phosphorus ranging from 0.005 percent (SB3-8.5) to 0.05 percent (SB6-14.5 and 15). Carbon:nitrogen:phosphorus ratios were not able to be calculated by the laboratory due to the large difference in magnitude between the percent organic content and nitrogen and phosphorus. However, carbon:nitrogen, carbon:phosphorus, and nitrogen:phosphorus ratios were calculated and are presented in the laboratory reports located in Appendix III. The pH of �. these,soil samples ranged from 8.01 to 8.12. Table 1 summarizes soil analytical results. Laboratory reports and chain of custody documentation for soil samples are included in Appendix III. In addition, the results from laboratory analysis of soil samples for falling head permeability, v percent moisture, porosity and dry bulk density are as follows. Soil samples from borings SBI and SB3 at depths of 2 to 4 feet bgs, 11 to 12 feet bgs, and 15.5 to 16 feet bgs were analyzed +- for the above parameters. The 2 to 4 foot sample was analyzed as a vadose zone sample and the 11 to 12 foot and 15.5 to 16 foot samples were analyzed as saturated zone samples. For �. the vadose zone sample, effective porosity was 33.0%, moisture content was 19.0%, native state effective permeability to air was 0.396 millidarcy, and the native state effective air conductivity was 3.27 x 10-5 centimeters per second (cm/s) (vertical). For the 11 to 12 foot saturated zone sample effective porosity was 36.0%, moisture content was 19.3%, native state effective permeability to water was 0.443 millidarcy, and the native state effective water conductivity was 4.55 x 10-7 cm/s (horizontal). For the 15.5 to 16 foot saturated zone sample effective porosity was 41.1%, moisture content was 18.7%, native state effective permeability to water was 1,473 millidarcy, and the native state effective water conductivity was 1.51 x 10.3 cm/s (horizontal). Further discussion of these results is presented in Section 6.0. Laboratory �., reports and chain of custody documentation for soil samples are included in Appendix III. wA95122TIumerpt 7 in • SMTN