Skip to main content

WQARF | ECP - 24th St & Grand Canal - Overview


East Central Phoenix - 24th Street and Grand Canal | Overview

Revised On: May 21, 2024 - 4:00 p.m.

Registry placement date: May 18, 2000

Score: 29

County: Maricopa


Phoenix, with the plume approximately bounded by East Pinchot Avenue to the north, East McDowell Road to the south, North 25th Street to the east and North 15th Street 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.

Contaminant of Concern

Tetrachloroethene (PCE)

Action Taken

The remedial investigation (RI) began in 2007. Numerous groundwater monitoring wells and soil vapor wells have been installed at the site. PCE has been detected in groundwater and soil vapor at concentrations as high as 2,900 micrograms per liter (μg/L) and 13,500,000 micrograms per cubic meter (μg/m³), respectively. A soil vapor extraction (SVE) system was designed in late 2015 and operated at the site until August 2017. The SVE system removed approximately 76 pounds of contaminants. In December 2017, the highest PCE soil vapor concentration detected was 470 μg/m³.

During semiannual groundwater monitoring conducted in April 2020, the highest PCE concentration observed in groundwater was 53 μg/L. An in-situ chemical oxidation groundwater treatment pilot study was initiated in February 2020 and is currently ongoing.

The RI Report was completed in June 2019 and the Feasibility Study Report was completed in September 2019. The Proposed Remedial Action Plan was released on April 2, 2020, for a 90-day public comment period, which concluded on June 30, 2020.


The Record of Decision is currently being prepared for the site.

Community Advisory Board (CAB)

Established and meets on a regular basis. A list of CAB members and their contact information is available in the Community Involvement Plan (CIP) | View/Download CIP >