The 120-acre municipal Harrison Road Landfill was operated by the City of Tucson from 1972 to 1997 (Harrison Landfill Site Map ).
Volatile Organic Compounds (VOCs) were detected in nearby groundwater in 1994 and reported to the Arizona Department of Environmental Quality (ADEQ). Environmental Services Engineering & Technical Support installed additional monitoring wells on State land in 1997 to define the downgradient edge of the plume.
Environmental Services uses groundwater pump-and-treat and soil vapor extraction against the contaminant plume. In order to eliminate the source of the plume, Environmental Services Engineering & Technical Support installed a deep soil vapor extraction system which operated from 1999 to 2006. ES periodically monitors the deep soil vapors below the landfill to ensure contaminant rebound does not occur.
In order to contain the spread of the existing groundwater plume, Environmental Services Engineering & Technical Support implemented a pump-and-treat groundwater remediation system which began operation in June 2001. The system continues to operate.