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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 2015, COT decided to collect additional groundwater sampling data for another 2 years prior to continuing with the RAP modification process. In 2017, ADEQ approved a revised Sampling Analysis Plan (SAP) that allows COT to submit reports to ADEQ annually and revise their well sampling plan.

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).   

In 2018, the PTI/R treated approximately 42.6 million gallons of water and removed approximately 1.72 pounds of PCE and 0.61 pounds of TCE.

Since startup of the PTI/R system in 1999, approximately 636 million gallons of groundwater have been treated and approximately 33.14 pounds of PCE and 12.37 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 2018.

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