PUBLIC NOTICE | Proposed Leaking UST Case Closure for Case File 5530.01-.02

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

LUST Case File No.: 5530.01-.02   

Facility ID No.: 0-008896
Yuma County

Facility address: 
Llantera El Cachanilla
986 W. 3rd Street
Yuma, Arizona 85364

Information

This commercial property (the Site) is located at 986 W. 3rd Street in Yuma. The Site operates as a tire shop (Llantera El Cachanilla).  The Site was used as the former Baker Exxon and the UST owner/operator was identified as Baker Exxon. The three 3K gasoline USTs were installed at an unknown date and permanently closed in November 2008.  LUST release .01 was assigned to the three 3K gasoline USTs, and LUST release .02 was assigned to the gasoline dispenser/DS-1 location. ADEQ’s State Lead Unit on behalf of the property owner conducted corrective actions. Initial site characterization activities were conducted between October 2009 and June 2010 and included soil borings and the installation of four monitoring wells.  Benzene, xylenes, trimethylbenzenes (TMBs) and naphthalene concentrations in soil exceeded the applicable regulatory standards. Groundwater samples also showed volatile organic compound (VOC) contamination concentrations that exceeded applicable regulatory standards. 

The remediation approach included air sparge (AS) and soil vapor extraction (SVE) for groundwater and soil clean up, respectively. The AS/SVE system began operation in March 2011 and ran until February 2013.  Three confirmation soil borings were installed in January 2016. The soil samples were analyzed for VOCs by EPA Method 8260B (including the AZ extended list), polyaromatic hydrocarbons (PAHs), and tetraethyl lead (TEL).  Most of the contaminants in soil and groundwater have decreased as a result of remediation.  Groundwater sampling results showed significant decrease of contamination as of January 2017.  

Current data provided by EEC, contractor to the State Lead Unit, and all other available site information has been used by ADEQ to determine whether remaining levels of contaminants at the site are adequately protective of human health and the environment.  A site specific risk assessment and detailed file/information search were also completed.  VOC analytical groundwater results in MW-1 show that benzene concentrations remain above the applicable Tier 1 Corrective Action Standard of 5.0 µg/L. The results for all other monitoring wells show no contamination present and is available in the LUST file.

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 (A.R.S.) §49-1005(E).  Arizona Administrative Code (A.A.C.) R18-12-263.04 allows case closure of a LUST site with groundwater contamination above the Arizona Aquifer Water Quality Standards (AWQS) or Tier 1 Corrective Action Standards. ADEQ has considered the results of a site specific assessment.

Review Document 

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

Public Comment Period 

Dates: March 13, 2018  April 13, 2018

Comments may be submitted as follows:
     By Email | Send Email > 
     By Mail (Must be postmarked or received by April 13, 2018):

       ADEQ
       Rick Brunton
       Waste Programs Division
       1110 W. Washington Street
       Phoenix, AZ  85007 

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