PUBLIC NOTICE | Post-Closure Hazardous Waste Permit for UArizona's Page-Trowbridge Ranch Landfill in Pinal County

A draft post-closure hazardous waste permit has been prepared for:

Facility Name

Page-Trowbridge Ranch Landfill (PTRL)


Pinal County: Located off Highway 77 to the North, between Oracle Junction and Oracle, about 30 miles north of Tucson


ADEQ has prepared a draft Post-Closure Hazardous Waste Permit (Draft Permit) for University of Arizona’s (UArizona) Page-Trowbridge Ranch Landfill (PTRL). The Draft Permit requires UArizona to perform post-closure care at PTRL, which occupies 3.25 acres and consists of two closed units: Unit A (200 ft by 200 ft) and Unit B (200 ft by 500 ft). Individual cells within the units were approximately 15 ft. deep. PTRL was used to dispose of chemical waste and low-level radioactive material generated at UArizona, Northern Arizona University, Arizona State University, and the Veterans Hospital in Tucson. Chemical wastes largely consisted of solvents, ignitable compounds, acids, bases, heavy metals, and pesticides. The PTRL operated from the early 1960s through 1986 and was closed in 1997.

As part of the closure activities, a final cover system with layers of clay, earth, geo-membrane, and vegetative grass, was constructed over each unit to prevent exposure to stormwater. Culverts and stormwater channels were installed to divert water from the site. The PTRL is surrounded by a six-foot high chain-link fence topped with barbed wire for security. Groundwater and soil vapor are routinely sampled to detect any releases from the PTRL. The Draft Permit renewal will allow UArizona to continue performing post-closure inspections, maintenance, and semi-annual groundwater and soil vapor monitoring at the PTRL. These actions are in accordance with Arizona rules established to protect human health and the environment. Once issued, the Post-Closure Permit would be effective for another ten years.

Review Documents

Original Published Public Notice | View > 
Fact Sheet | View >
Draft Permit | View > 
Draft Administrative Record | View >  

Permit Approval Form | View >
Final Permit Issued | View >
Final Administrative Record |
View > 

PTRL Site Overview Webpage | View >

Documents may also be reviewed in person at the ADEQ Record Center | Learn More >

Public Comment Period

Dates: April 25, 2022 – June 9, 2022

Comments may be submitted as follows:

By Email Email >

By Mail: (Must be postmarked or received by June 9, 2022)

Gav Orman
Waste Programs Division
1110 W. Washington St.
Phoenix, AZ 85007