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PUBLIC NOTICE | Proposed Leaking UST Case Closure for Case File 5244.01-.02

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

LUST Case File No.: 5244.01-.02     

Facility ID No.: 0-009710
Yuma County

Facility address: 
Rancho Viejo School former Bus Facility
930 S. Avenue C
Yuma, AZ 85364


This commercial property is located at 930 South Avenue C in Yuma. The property was formerly used as a school bus maintenance facility as part of the old Rancho Viejo School complex.  In February 2001, one 550-gallon underground storage tank (UST) and its dispenser was removed.  Soil samples were collected and detected benzene at levels that exceeded the applicable regulatory standards.  Benzene, toluene, ethylbenzene, xylene (BTEX) and 1,2-dichloroethane (1,2-DCA) were seen in the soil and groundwater results, so the indication was a leaded gasoline release.  In February 2009, the maintenance building was demolished and the property is currently undeveloped.

Crane Elementary School District #13 (the property owner and the UST Owner/Operator) has conducted site characterization and remedial activities. Site characterization included the installation of soil borings and monitoring wells.  600 tons of petroleum contaminated soil was removed from the area. In 2009 a Perozone™ sparge system to remediate the volatile organic compound (VOC) contamination in the soil and groundwater. The system operated until 2014.

A site specific risk assessment and detailed file/information search were also completed.  Benzene analytical groundwater results in MW-4R remain above applicable regulatory standards. 1,2-DCA analytical groundwater results in MW-10 and MW-12 remain above applicable regulatory standards.

Review Document 

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

Public Comment Period 

Dates: March 17, 2017  April 17, 2017

Comments may be submitted as follows:
     By Email | Send Email > 
     By Mail (Must be postmarked or received by April 17, 2017):

       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 >