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Los Reales Landfill | Site Overview

Registry placement date: April 23, 1999

Score: 32

County: Pima

Location: An active municipal solid waste landfill (approximately 283-acre waste footprint) in southeast Tucson that has been in operation since 1967.

If you own a private well, live in or near the site boundaries, and have not had your well tested, please contact City of Tucson Environmental Services at 520-791-3175 | Learn More >

Contaminants of concern: Tetrachloroethene (PCE) and trichloroethene (TCE) 

Action taken: In 1999, the City of Tucson (COT) implemented a groundwater Pump and Treat System with Injection and Reuse (PTI/R) of the treated water as required by a 1995 Remedial Action Plan (RAP). In 2012, COT submitted to ADEQ a RAP modification proposal to modify the RAP to allow transition from PTI/R to “groundwater sampling only” based on continued plume stability (apparent natural attenuation). In 2020, COT decided not to pursue a RAP modification and submitted an updated Sampling Analysis Plan (SAP) for annual groundwater monitoring.

Status: COT has continued operations of the PTI/R system onsite in conjunction with an ongoing rehabilitation program of groundwater extraction wells, three wells were rehabilitated in 2018. Since 2017, COT has evaluated data from the extraction wells and has planned to cease operations of wells that produce less than two gallons per minute and where PCE and TCE concentrations are below Aquifer Water Quality Standards (AWQS).   

Since startup of the PTI/R system in 1999, approximately 674 million gallons of groundwater have been treated and approximately 34.64 pounds of PCE and 12.95 pounds of TCE have been removed.

COT also monitors two privately owned wells in the area annually, neither detected PCE or TCE above their respective AWQS in 2019.

Community Advisory Board (CAB): Not applicable under “Old WQARF” law/rules