Construction to begin on Silverbell Groundwater Remediation System

 

Project Background

  • The Silverbell Landfill is 53 acres in size and accepted municipal solid waste from 1966 to 1975.  It is located north of Grant Rd. and south of El Camino del Cerro.
  • The Silverbell Landfill is designated as a state superfund site by the Arizona Department of Environmental Quality (ADEQ). 
  • The groundwater beneath the site has been impacted with volatile organic compounds, primarily tetrachloroethylene (PCE).
  • Groundwater monitoring has been performed at the Silverbell Landfill for the past 20 years and groundwater modeling and initial remedial system design activities have been performed for the past 10 years.
  • The City of Tucson’s Environmental and General Services Department began the remedial system design in June 2016.

Project Description

  • Impacted groundwater will be pumped from three groundwater extraction wells located on the Silverbell golf course property. 
  • 1.44 million gallons of impacted groundwater will be treated on-site in a remediation compound each day. The groundwater will meet ADEQ’s aquifer water quality standards.
  • The treated groundwater will be pumped to the Tucson Water Sweetwater Recharge Facility or to the irrigation pond at the Silverbell Golf Course.
  • The engineering design for the remediation system will be completed in November of  2016.

Project Costs

  • The overall project budget of $5.6 million includes project design, construction and the first year of system operation and maintenance.  The design budget is $630,000 and the construction budget is $4,400,000.  The first year budget for operation and maintenance is $570,000.

Project Schedule

  • Estimated start of construction is January 2017 and construction will be completed in September 2017.