Registry placement date: Sept. 18, 1998

Score: 62

County: Pima

Location

Tucson, approximately bounded by Curtis Road to the north, Prince Road to the south, Pomona Road to the east and La Cholla Boulevard 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

Trichloroethene (TCE) and chromium

Action Taken

In 2013, the final remedial investigation report was issued and the feasibility study (FS) was initiated.  ADEQ has begun addressing RI data gaps.

A local water provider was operating an ADEQ-funded wellhead treatment system as an early response action to remove TCE from early 2007 to mid-2018. This system has been placed on bypass as concentrations of TCE have fallen below regulatory levels.

By 2018, all RI data gaps were addressed: additional boreholes and wells were installed to aid in delineating the lateral extent of the TCE groundwater plume; a soil vapor extraction (SVE) pilot test was conducted; the shallow soil-gas plume was defined; and indoor air samples were collected where soil-gas results indicated. In 2019, ADEQ installed a wellhead treatment system on a small water provider’s drinking water well.

ADEQ issued the Feasibility Study (FS) in October 2019. The FS report evaluated three different approaches to address the soil and groundwater contamination at the site. Within the FS, ADEQ selected remediation that included Soil Vapor Extraction, groundwater pump and treat, continued wellhead treatment, and continued maintenance of engineered the cap. The FS also described contingencies, including addition of chromium treatment to the pump and treat system and additional wellhead treatment systems.

ADEQ has further detailed the proposed remedy in the Proposed Remedial Action Plan (PRAP), which was released for public comment on June 2, 2020. The public comment period ended on August 31, 2020.

Status

ADEQ is currently working on preparing the Record of Decision for the site. Additionally, site-wide groundwater monitoring is conducted on an annual basis.

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 >