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North Indian Bend Wash (NIBW) Superfund Site North Indian Bend Wash (NIBW) Superfund Site North Indian Bend Wash (NIBW) Superfund Site

North Indian Bend Wash (NIBW) Superfund Site

We are committed to cleaning up impacts to groundwater from our historical facility operations at the North Indian Bend Wash site in Scottsdale, Arizona.

Environmental cleanup at the NIBW Superfund Site

On behalf of the NIBW Participating Companies, Motorola Solutions manages environmental cleanup activities at the NIBW site. Designated in 1983 by the U.S. Environmental Protection Agency, the site is impacted by volatile organic compounds (VOCs), principally trichloroethylene (TCE) from historical operations conducted by several companies at various locations.

Remediation progress and site overview

Remediation progress and site overview

Soil remediation was complete by 2015. The groundwater plume extent has decreased substantially since remediation began in 1994. The final remedy for the site has been in place since 2013 and has been deemed protective of human health and the environment. Read our fact sheet to learn about the site history and features, the extent of TCE impacts to groundwater, and remediation system operations.

Current status and remediation progress

TCE is present in groundwater beneath the NIBW site in three aquifer units, referred to as the upper alluvium unit (UAU), middle alluvium unit (MAU), and lower alluvium unit (LAU).

Middle Alluvium Unit (MAU) Plume Animation

Little TCE remains in the UAU. The amount of TCE in the MAU has decreased since remediation began in 1994. MAU groundwater flows toward the western margin and into the LAU, and is remediated using three extraction and treatment systems. See how the MAU plume has changed over time in this video.

Watch video

Lower Alluvium Unit (LAU) Plume Animation

The amount of TCE in the LAU has also decreased since remediation began. LAU groundwater flows northward due to regional groundwater pumping near McDonald Drive. The LAU plume is remediated using three extraction and treatment systems. See how the LAU plume has changed over time in this video.

Watch video

The final remedy is in place and is protective of human health and the environment

The NIBW Participating Companies, SRP, City of Scottsdale, US Environmental Protection Agency, and Arizona Department of Environmental Quality collaborate to control human exposure to VOCs and reduce concentrations of VOCs in groundwater over time.

Health studies conclude no human health risks

Government agencies have conducted independent health studies which have all concluded that groundwater at the site presents no current health risks to people who live and work in the area. Learn about these in our Health Studies Fact Sheet.

Groundwater remediation takes place at five NIBW treatment facilities

We use proven technologies to extract groundwater and treat it to remove VOCs. Groundwater is pumped from a network of wells and conveyed to five treatment facilities at the site. Our map shows the components of the extraction and treatment systems.

Interested in more information? Learn more with our FAQ sheet.

Read the FAQ

Additional resources

Arizona Department of Environmental Quality (ADEQ)

Arizona Department of Environmental Quality (ADEQ)

As required by Superfund, the USEPA coordinates work for the NIBW Superfund Site with the ADEQ. ADEQ provides technical input and oversight of work performed by the NIBW Participating Companies.

Learn more
US Environmental Protection Agency (USEPA)

US Environmental Protection Agency (USEPA)

The USEPA is the lead agency for the NIBW Superfund Site. The USEPA provides oversight of work performed by the NIBW Participating Companies and manages work performed by USEPA contractors.

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City of Scottsdale

City of Scottsdale

The City of Scottsdale operates water treatment facilities and provides clean drinking water to residents in their service area. The NIBW Participating Companies routinely coordinate with the City.

Learn more

Additional NIBW Site Documents

NIBW Site Information Packet

Information about the site background, hydrogeology, cleanup technologies and treatment facilities.

Download

2022 Site Monitoring Report

Summarizes monitoring program data and a remedy performance evaluation for 2022.

Download

FSA Executive Summary

The Feasibility Study Addendum (FSA) was prepared to select the most effective remedy for the site.

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