A CASE-STUDY OF THE NATURAL ATTENUATION OF GAS CONDENSATE HYDROCARBONS IN SOIL AND GROUNDWATER

Condensate liquids have been found to contaminate soil and groundwater at two gas production sites in the Denver Basin operated by Amoco Pro duction Co. These sites have been closely monitored since July 1993 to determine whether intrinsic aerobic or anaerobic bioremediation of hy drocarbons occurs at a sufficient rate and to an adequate end point to support a no-intervention decision. Groundwater monitoring and analys is of soil cores,suggest that intrinsic bioremediation is occurring at these sites by multiple pathways, including aerobic oxidation, Fe(III ) reduction, and sulfate reduction.