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Los Reales Landfill | Site Overview

Registry placement date: April 23, 1999

Score: 32

County: Pima

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

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 of the treated water (PTI/R) 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 PRI/R to “groundwater sampling only” based on continued plume stability (apparent natural attenuation).  

Status: COT installed three new groundwater monitoring wells that were needed to evaluate plume stability for the proposed monitoring only RAP modification and five sampling events have been completed.  After three more sampling events are evaluated then COT will perform additional modeling to support the monitoring only RAP modification. If the modeling results are supportive, COT will finalize the RAP modification proposal and submit it to ADEQ for review/approval.  Also, COT has begun ceasing operation of extraction wells that produce less than two gallons per minute and those where PCE and TCE concentrations are below Aquifer Water Quality Standards.

Since startup of the PTI/R system in 1999, approximately 594.4 million gallons of groundwater have been treated and approximately 31.42 pounds of PCE and 11.76 pounds of TCE have been removed.

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