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PUBLIC NOTICE | Proposed Leaking UST Case Closure for Case File 5448.01

ADEQ is considering closure of the following leaking underground storage tank (LUST) case:

LUST Case File No.: 5448.01      

Facility ID No.: 0-001455
Pima County

Facility address: 
Circle K No. 01631
2 W. Valencia Road
Tucson, AZ 85706

According to the LUST file, three 1,000-gallon USTs were installed in April 1985 at this commercial property. A consultant reported a suspected release to ADEQ in April 2004 based on a property transfer environmental assessment. A new consultant confirmed the suspected release and ADEQ assigned a release number to the UST basin in March 2005. The consultant determined that the release was from the southern UST. Site characterization activities included soil and groundwater sampling after the installation of five monitoring wells (MWs). MW-1 was installed at the source. The Site Characterization Report was approved in 2006. Active soil and groundwater remediation using air sparge and vapor extraction (AS/VE) was used between September 2008 and May 2013.

A site-specific risk assessment and detailed file/information search were also completed. MW-1 shows volatile organic compound (VOC) contamination. Benzene, 1,2-DCA (1,2-dichloroethane) and ethylene dibromide (EDB) are the remaining contaminants present in concentrations over an applicable regulatory standard. The benzene concentrations have declined from 3,760 micrograms per liter (µg/L) to 1,340 µg/L between August 2015 and November 2015. During the same sampling events, the concentration of 1,2-DCA has dropped from 37 µg/L to 29.5 µg/L and the EDB concentration has dropped from 9.6 µg/L to 6.2 µg/L. 1,2-DCA and EDB were additives found in leaded gasoline. 1,2-DCA and EDB were additives found in leaded gasoline. Trichloroethylene (TCE) is present in concentrations over the applicable regulatory standard in all five monitoring wells.  The site is located within the boundaries of the Tucson Airport Remediation Project (TARP) of the Tucson International Airport Area Federal Superfund National Priorities List (NPL) site. 

Based upon the results of remedial activities and site-specific information, the above-referenced LUST site is eligible for alternative LUST closure under Arizona Revised Statutes (ARS) §49-1005(E). Arizona Administrative Code (AAC) R18-12-263.04 allows case closure of a LUST site with groundwater contamination above the AWQS or Tier 1 Standards.

Review Document 

Review results of remedial activities and entire public notice | View/Print >

Public Comment Period 

Dates: Feb. 8, 2017  March 8, 2017

Comments may be submitted as follows:
     By Email | Send Email > 
     By Mail (Must be postmarked by March 8, 2017):

       Scott Goodwin
       Waste Programs Division
       1110 W. Washington Street
       Phoenix, AZ  85007 

Documents may also be reviewed in person at the ADEQ Record Center | Learn More >