PUBLIC NOTICE | Proposed Leaking Underground Storage Tank Case Clean Up in Yuma

A Revised Corrective Action Plan (CAP) dated Sept. 6, 2021, has been submitted to ADEQ. The CAP contains a proposal to clean up petroleum contamination from an underground storage tank (UST) system at the following facility:

Leaking UST Case File No.: 1821.01 – .04
Facility ID No.: 0-001119
Yuma County

Facility Address: 
Former Chevron #9-4567
1450 E. 16th St.
Yuma, AZ 85365

The proposed activities include the following cleanup technologies that will be used to obtain the cleanup levels that are protective of public health, welfare and the environment:

Thermal In-situ Sustainable Remediation (TISR) is a relatively inexpensive and practical remedial technology for moderate heating of target contaminant treatment zones in the subsurface by using solar or waste heat collection and closed-loop heating via borehole heat exchangers (BHEs). Thermal conduction and some advection results in enhancement of physical, biological, and chemical processes that attenuate, degrade, and remove contaminants. The site objectives are to treat soil and groundwater impacts (primary driver benzene and impacts below groundwater); therefore, TISR operation will enhance biodegradation by stimulating mesophilic range microorganisms.

Solar collectors are used to heat a water-glycol solution to a maximum temperature of up to 250°F or 120°C. The typical operational temperature on the TISR systems range from 90 to 170°F measured at the aboveground pump station. The heated solution is circulated and transferred in a closed-loop system through insulated trenched conveyance lines to BHEs. The BHEs consist of vertical borings with a steel casing wrapped in corrugated non-insulated stainless-steel heat transfer pipe installed at the target treatment interval. Typically, the BHE has a radius of influence of 10 to 15 ft. However, the actual radius of influence will be dependent on-site specific factors (e.g., BHE operating temperature and Darcy velocity).

Review Documents

Original Published Public Notice | View/Print >

You may review the leaking UST case file and the Revised Correction Action Plan at the ADEQ Record Center | Learn How >

Public Comment Period 

Dates: Nov. 19, 2021 – Dec. 19, 2021

Comments may be submitted as follows:

     By Email | Send Email > 
     By Mail (Must be postmarked or received by Dec. 19, 2021):

       Garrett Tabor
       Waste Programs Division
       1110 W. Washington St.
       Phoenix, AZ  85007 

If sufficient public interest is demonstrated during the public comment period, ADEQ may announce and hold a public meeting.