A-Mountain Landfill

The A-Mountain Landfill is located between the Santa Cruz River and Mission Road at the eastern base of A-Mountain. This landfill was used for the disposal of municipal solid waste from 1953-1962. Today the City monitors five shallow landfill gas probes quarterly. The landfill is owned and maintained by the City of Tucson.

Low concentrations of volatile organic compounds (VOCs) have been detected in groundwater wells within the vicinity of the A-Mountain Landfill. All of these concentrations are below their respective the regulatory standard.

Broadway North And South Landfills (Non-City Owned Landfills)

The Broadway-Pantano Water Quality Assurance Revolving Fund (WQARF) Site is a State Superfund Site which includes the Broadway North and South Landfills. The property is privately owned, however the City of Tucson disposed of municipal solid waste in the Broadway North Landfill in the past. Groundwater contaminated by tetrachloroethene (PCE), above regulatory standards, has been detected. The City was involved a work share agreement with the Arizona Department of Environmental Quality (ADEQ) to monitor groundwater quality from December 2008 – February 2015. The Western Containment System (WCS), which removed and treated PCE contaminated groundwater, operated from March 2003 – October 2012. It was shutdown due to low PCE concentrations in the groundwater extraction wells.

Although groundwater contamination above regulatory standards has been detected in some areas, Tucson Water monitors and limits usage of nearby drinking water production wells. All Tucson Water drinking wells meet all primary drinking water standards.

Harrison Landfill

The Harrison Road Landfill accepted municipal solid waste from 1972 until it closed in 1997. Data indicates soil vapor contaminated with volatile organic compounds (VOCs), specifically tetrachloroethene (PCE), migrated from the waste to the groundwater table and caused groundwater contamination of PCE at levels above regulatory standards. The City operated a deep soil vapor extraction (SVE) system to remove the source of the groundwater contamination, and a groundwater pump and treat system to control and clean up the PCE contaminated groundwater. In addition, a landfill gas flare system was constructed to control the migration of methane and VOCs from the waste. The site is regulated under the Arizona Department Environmental Quality (ADEQ) Solid Waste Unit. The groundwater pump and treat system was shut-down in December 2015 as VOC concentrations have been below regulatory standards since 2013.

Although groundwater contamination has been detected above regulatory standards, there are no nearby Tucson Water drinking water wells. The City monitors a downgradient private drinking water well semiannually for landfill impact.

Irvington Landfill

The Irvington Landfill is located on the south side of Irvington Rd a quarter of a mile west of Houghton Rd. This landfill was used for the disposal of municipal solid waste. Today the City monitors fourteen shallow landfill gas probes, one nested deep soil vapor well, and four groundwater monitoring wells around the landfill as part of the Arizona Department of Environmental Quality’s (ADEQ) Aquifer Protection Permit (APP). The landfill is owned and maintained by the City of Tucson.

Monitoring has indicated the landfill has not impacted groundwater quality.

Los Reales Landfill

Los Reales Landfill is an active municipal solid waste landfill located near I-10 and Craycroft Rd. The site is regulated by the Arizona Department of Environmental Quality’s (ADEQ) under the Solid Waste Unit, the Water Quality Assurance Revolving Fund (WQARF) program and the Voluntary Remediation Program (VRP). Groundwater contamination of tetrachloroethene (PCE) and trichloroethene (TCE) above regulatory standards has been detected along with other volatile organic compounds (VOCs) at concentrations below regulatory standards from the older, unlined portion of the landfill. The City is operating a groundwater pump and treat system to contain and cleanup the contaminated groundwater. Treated water is used for dust control and is also re-injected into the groundwater. The City is required to report the amount of groundwater extracted annually to the Arizona Department of Water Resources (ADWR). The City entered the VRP program for the remediation and closure of the Southwest Disposal Area (SWDA), an area of the landfill which accepted industrial waste from 1977 to 1980. The City briefly operated a deep soil vapor extraction system at the SWDA to remove VOCs to prevent vapors from contaminating groundwater. Methane extracted from the landfill gas system is sent to Tucson Electric Power Company and used to provide electricity to the community.

Although groundwater contamination has been detected above regulatory standards, there are no Tucson Water drinking water wells nearby. The City monitors three downgradient private drinking water and irrigation wells during routine monitoring events for landfill impact.

Silverbell Landfill

The Silverbell Landfill is located along the western bank of the Santa Cruz River next to the Silverbell Golf Course. The landfill was used for the disposal of municipal solid waste. Today the landfill is an Arizona Department of Environmental Quality’s (ADEQ) Water Quality Assurance Revolving Fund (WQARF) site due to groundwater levels of tetrachloroethene (PCE) and trichloroethene (TCE) that exceed regulatory standards. Due to a break in a pipeline owned by Kinder Morgan in 2003, benzene and methyl tert-butyl ether (MTBE) exceeding regulatory standards have migrated into the southern portion of the Silverbell plume. Today the City inspects the landfill annually, monitors landfill gas probes at the boundary quarterly, monitors groundwater wells semiannually, monitors deep soil vapor probes triennially. A conceptual design for a groundwater pump and treat system for addressing the chlorinated solvents (PCE and TCE) has been completed.

Although groundwater contamination has been detected above regulatory standards, there are no Tucson Water drinking water wells nearby.

Thomas O. Price Service Center (LUST Site)

The Thomas O. Price Service Center is a primary fueling facility for the City of Tucson, and has been in operation since 1972. The facility is located at the southwest corner of Ajo Way and Park Ave. (Thomas O. Price Service Center Site Map). Historically, the facility maintained 23 underground storage tanks (USTs) for gasoline and diesel. During the late 1980s, the UST system was found to have leaked an unknown amount of fuel into the soil below the fueling tanks, dispensers, and delivery piping. The tanks were emptied and removed from service in the early 1990’s. Gasoline had migrated to a clay layer 90 feet below the site (in the upper groundwater zone), and has since migrated to the north of Ajo Way and beneath Fire Station 10. Today the City operates two soil vapor extraction systems (SVE) to remove contamination from the soil, and also pumps the gasoline from the upper groundwater zone above the clay. Currently, the City monitors 67 shallow and lower groundwater monitoring and remediation wells annually to detect the gasoline and dissolved benzene in the upper groundwater zone and MTBE in both the upper and lower groundwater zones. Benzene exceeds the regulatory standard in the perched groundwater zone. All work is completed under the oversight of Arizona Department of Environmental Quality (ADEQ) Leaking Underground Storage Tank (LUST) Program accordance with the Corrective Action Plan Modification, dated February 11, 2002.

Although groundwater contamination has been detected above state action levels, there are no Tucson Water drinking water wells nearby.

Vincent Mullins Landfill

The Vincent Mullins Landfill is located on the eastern bank of the Pantano Wash just north of Speedway Blvd. This landfill was used for the disposal of municipal solid waste. Soil vapor contaminated with volatile organic compounds (VOCs), specifically tetrachloroethene (PCE), migrated from the waste to the groundwater table and caused groundwater contamination of PCE exceeding regulatory standards. Today the City monitors twenty-three shallow landfill gas probes, three nested deep soil vapor wells, thirteen groundwater monitoring wells and two privately owned irrigation wells around the landfill. In addition, a landfill gas flare system was constructed to control the migration of methane and VOCs from the waste. The site is regulated under the Arizona Department Environmental Quality (ADEQ) Solid Waste Unit in accordance with the site’s Aquifer Protection Permit (APP). The landfill is owned and maintained by the City of Tucson.

Groundwater contamination has been detected exceeding regulatory standards in one well. No contamination has been detected in Tucson Water drinking water wells.

Contact details

City of Tucson – Environmental Services

520-791-3175

Location

Northeast of Kolb Rd and Speedway Blvd, Tucson 85710


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