Objectives Remediation of petroleum impacted soil and groundwater associated with a former fueling facility as required under state regulations.
Location 260 South Stone Avenue
Waste Acreage N/A
Operation Dates Remediation Initiated in 2009
Status Active Clean-up Site
Type Leaking Underground Storage Tank Project
Annual Budget Approximately $250,000
Contact City of Tucson - Environmental Services 520-791-3175
Description A release of petroleum-based fuels from the former fueling facility occurred and ADEQ reopened LUST File #3208.01. An Assessment was conducted and found soil impacts above Arizona Soil Remediation Levels (SRLs) which included dissolved gasoline compounds, and Light Non-aqueous Phase Liquid (LNAPL) floating on the perched groundwater. The LNAPL consists of old gasoline. The City of Tucson currently operates a Soil Vapor Extraction System and groundwater Pump and treat System to remediate petroleum impacted soil and remove free-phase and dissolved phase gasoline from the perched groundwater table.
Additional Info Although groundwater contamination has been detected above regulatory standards in the perched groundwater, no drinking-water production wells are located within 1/2 mile of LUST site.
Activities Groundwater Monitoring, Groundwater Remediation, Soil Remediation
Last Update Thursday Feb 6, 2014
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Project Details

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  • May 2013
    City installed Soil Vapor Extraction System (SVE) to remediate petroleum hydrocarbons in the wells located close to the source area; this system works in conjunction with the pump and treat system.
  • Fall 2012
    City conducted SVE feasibility study. Study concluded SVE would be successful at removing petroleum hydrocarbons at the source and accelerate environmental case closure. The feasibility study is available it the reports/attachments section of this website.
  • Spring 2012
    City conducted second round of field remediation pilot tests involving the addition of an oxidizer to shallow wells to remediate the contaminated soils in the subsurface.
  • September 2011
    The City submitted Oxidation Pilot Study results to ADEQ for review.
  • 2010
    Soil and groundwater remediation and monitoring ongoing.
  • 2009
    Soil and groundwater remediation implemented.
  • 2008
    Site characterization assessment conducted, groundwater monitoring and LNAPL removal initiated.
  • 2007
    Groundwater assessment started in vicinity of HQUST, petroleum compounds detected.
  • 1999
    Evidence of leaks not found, site given regulatory closure.
  • 1993
    Fuel System removed, and assessed for leaks. Some evidence of leaks encountered.
  • 1972
    Fuel System installed at Police and Fire Department Headquarters (HQUST)