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WQARF | 7th St & Arizona Ave - Overview


7th Street and Arizona Avenue | Overview

Revised On: Jan. 4, 2024 - 10:43 a.m.

Registry placement date: April 27, 2000

Score: 40

County: Pima


Downtown Tucson, approximately bounded by Speedway Boulevard to the north, Eighth Street and the Union Pacific Railroad to the south, Fourth Avenue to the east and Ninth Avenue to the west.

If you own a private well, live in or near the site boundaries, and have not had your well tested, please contact ADEQ.

Contaminants of Concern

Tetrachloroethene (PCE), trichloroethene (TCE) and cis-1,2-dichloroethene (cis-1,2-DCE)

Action Taken

ADEQ operated an early response action soil vapor extraction (SVE) system at the former Oliver’s Cleaners (site source) from June 2006 to July 2009 that removed more than 700 pounds of volatile organic compounds (VOCs).

ADEQ issued the final remedial investigation (RI) and final feasibility study (FS) reports in 2014. In 2015, a former dry-cleaning facility property at 847 N. Stone Ave was added to the site as a second source. SVE was implemented at 847 N. Stone Ave from December 2017 to April 2019, as an early response action for this second source. SVE operations continue, with few interruptions, to the current day.

The Record of Decision (ROD) for the site was published June 30, 2020, and public notice of the ROD was published July 2, 2020. The ROD dictates the use of vapor extraction for treatment of the source areas and Monitored Natural Attenuation (MNA) for treating the chlorinated solvent plume in the perched aquifer.


Remedial SVE operations continue at the Stone Avenue source property. Design work has been completed for a new SVE system at the Oliver’s Cleaners property.

Community Advisory Board (CAB)

Established, merged with the Park-Euclid CAB in 2014. A list of CAB members and their contact information is available in the Community Involvement Plan (CIP) | View/Download CIP >