Silverbell Landfill Groundwater Remediation

The Silverbell Jail Annex is a closed municipal landfill operated by the City of Tucson from 1966-1977. The site is divided into two disposal cells (Silverbell Jail Annex Landfill Site Map pdf). The south cell is located just south of the former Tucson Police Academy and the north cell is located beneath the City of Tucson's Silverbell Golf Course. Groundwater contamination was first noted under the landfill in 1985.

Soil Vapor Extraction/Air Injection SystemEnvironmental Services Engineering & Technical Support's objectives at this site are to:

  • remove the source of contamination
  • control the spread of the contaminant plume
  • restore the groundwater quality at the site

In 2000, the City installed a soil vapor extraction/air injection system to remove volatile organic compounds (VOCs) from the soil beneath the landfill, thus removing the source of the groundwater contamination. As of August 2002, the system had removed 1843 pounds of VOCs including 649 pounds of tetrachloroethene (PCE), the primary contaminant of concern.

Environmental Scientist

The groundwater contaminant plume from the Silverbell Jail Annex Landfill has been monitored on a semi-annual basis since 1985. The plume is relatively slow moving and stable, and does not threaten any drinking water production wells.

The City is currently designing and constructing a groundwater pump-and-treat system per the approved ADEQ Remedial Action Plan.

If you have any questions, please contact Environmental Management at (520) 791-5414.

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