Demonstration of Bioventing for Remediation of Chlorinated Solvent Contamination at Hill Air Force Base, Ogden, Utah, Volume II

This report describes the evaluation of the application of bioventing technology to non-petroleum hydrocarbon impacted soils. Bioventing has been thoroughly demonstrated to be a cost-effective remediation technology for a variety of petroleum hydrocarbons. This work included a laboratory column study and a field pilot-scale demonstration to evaluate the potential for applying bioventing to treat dichlorobenzenes in order to expand the list of contaminants impacting Air Force and other Department of Defense Installations beyond petroleum hydrocarbons. A pilot-scale bioventing system consisting of a single vent well and eight tri-level in situ soil gas monitoring points was installed at Hill Air Force Base, Utah. The system was designed to provide oxygen to an anoxic volume of soil and for monitoring the aeration effectiveness and conducting in situ respiration rates. Soil samples were collected at system installation and alter approximately one year of system operation. Significant reductions in dichlorobenzene concentrations were observed over the one year demonstration, only a small portion of which could be accounted for by volatilization. In situ respiration tests indicated that significant biodegradation and supported the results observed in the field. The demonstration was supported by personnel in the Hill Air Force Base Environmental Management Office. ADA361494