Tucson International Airport Area

Tucson International Airport Area

Superfund Site | Texas Instruments: Page 2 of 2

Action Taken

A pump and treat remediation system operated from 1992 until 2009.  Groundwater from the West-Cap project area was also treated by the Texas Instruments treatment system from 1999 until 2009.  Between 1992 and 2009 the treatment system removed a total of about 16.3 pounds of TCE from approximately 176 million gallons of groundwater.    In the fall of 2009, a pilot test was initiated for In-Situ Chemical Oxidation (ISCO) using potassium permanganate to treat TCE in groundwater.

Status

Following issuance of a Record of Decision (ROD) Amendment in April 2012, EPA and ADEQ entered into discussions with Texas Instruments to negotiate a consent decree (CD) to implement an ISCO remedy at the Texas Instruments project area.  The CD was signed in June 2015, and Texas Instruments initiated the ISCO remedy in February 2016 with baseline groundwater sampling.  Injection of the potassium permanganate into the vadose zone above the TCE contaminated groundwater at the site occurred in July and August 2016.  Currently, the groundwater is being monitored to evaluate the effectiveness of the ISCO remedy and Texas Instruments submits quarterly progress reports to EPA and ADEQ.

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