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Vincent Mullins Landfill | Solid Waste Site


Vincent Mullins Landfill
Closed Municipal Solid Waste Landfill
Located Northeast of Kolb Road and Speedway Boulevard in Tucson, AZ

Discovery Date:

January 2004

Contaminants of Concern (COCs):

  • Volatile organic compounds (VOC)
  • Tetrachloroethylene (PCE)

Affected Media:

  • Soil
  • Groundwater

What Are My Health Risks?

For Soil | There is little to no health risk unless there is contact with skin or ingestion of contaminated soil.

For Groundwater | If you are connected to a Public Water System (PWS) there is little to no risk of impact from exceedances because the water is filtered through the PWS for residential and business use. | View Drinking Water Notices > 

If you have a private well in the vicinity of the exceedance, we encourage you to test the well water.
Not sure what to test for?
Learn More > 

Site Summary:

The Vincent Mullins Landfill is owned and maintained by the City of Tucson and is located on the eastern bank of the Pantano Wash just north of Speedway Boulevard. The landfill accepted municipal solid waste between 1976 and 1987, and the waste footprints comprises of 32.4 acres. It is a closed landfill being maintained in accordance with an approved Aquifer Protection Permit (APP). Soil vapor contaminated with VOCs, specifically PCE, migrated from the deposited waste to the groundwater table and caused groundwater contamination of PCE exceeding regulatory standards. The City of Tucson monitors 23 shallow landfill gas probes, 13 groundwater monitoring wells, three nested deep soil vapor wells and two privately owned irrigation wells around the landfill. In addition, a landfill gas flare system was constructed to control the migration of methane and VOCs from the waste.

Corrective Action: 

  • Approval of landfill closure was completed on November 7, 2007 beginning the 30 year Post Closure care and maintenance period of the landfill APP
  • In January 2005, a new and expanded landfill gas extraction system began operations to address a main element of the corrective action plan: to clean up VOC in the soil and eliminate potential sources in the landfill.
  • Quarterly landfill gas monitoring is conducted at perimeter probes to monitor methane migration at the property boundary.
  • Semi-annual groundwater monitoring is completed and reviewed of the 13 groundwater monitor wells and two privately owned irrigation wells.