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Also contributing to the possible retarded transport of detectable benzene as the active aerobic <br /> degradation by naturally occurring bacteria colonies Three discrete soil samples were collected from <br /> Iapproximately 56, 81 and 76 feet bgs and submitted to GTEL Environmental Laboratories, Inc for <br /> evaluation of nucrobial populations Results indicate that although there are significant populations <br />' of contaminant utilizing bacteria present an all three samples, the greatest population of microbial <br /> colones is present an the saturated sandy zone beneath the former tank pit area Laboratory analytical <br /> Iresults are provided in Appendix D <br /> I <br /> I TABLE 4 <br /> PARAMETERS ASSUMED FOR FATE AND TRANSPORT MODELING <br /> I <br /> PARAMETER VALUE COMMENTS <br /> Hydraulic Conductivity, 1 x 10-4 Measured from site samples <br /> vertical cm/sec <br /> Hydraulic Conductivity, 1 x 10-3 Estimated based on stratification <br /> horizontal cm/sec ratio <br /> Porosity 04 Measured from site samples <br /> 0-Y1� <br /> Specific Gravity (g/cm.') 26 Measured from site samples <br /> LoE K for benzene 2 13 From published values VV'" "mP- <br /> Gradient ft/ft 0001 - 001 Measured from historic site data <br /> Benzene Retardation Factor 1 11 Calculated from above values <br /> an sandy zone <br /> I <br />■� q SZ4COR° <br /> N0026 001 01 ROF 12 August 1 1994 <br />