Water Quality Assurance Revolving Fund (WQARF) Site

56th Street and Earll Drive

Community Involvement Activities Public Health Impact Site Hydrogeology
Contacts Public Meeting Calendar Site Map
Contaminants Public Notice Calendar Site Status Update
Online Information Repository Site History

The 56th Street and Earll Drive WQARF site groundwater contamination plume in Phoenix, Arizona is bounded by Earll Drive to the north, Roosevelt Street to the south, 56th Street to the east and 26th Street to the west.

Site Status Update:

Freescale and ADEQ have finalized an agreement for Freescale to continue to operate and maintain the groundwater pump and treat system as the early response action (ERA) to address the TCE and PCE in the groundwater. Freescale constructed a groundwater pump and treat system as part of the ERA and began operation in November 2013. Groundwater is extracted and treated then discharged into the Grand Canal system for non-potable beneficial reuse as irrigation water under an agreement with Salt River Project (SRP). ADEQ and Freescale have finalized a Consent Order for Freescale to perform the Remedial Investigation and Feasibility Study for the site.

Community Involvement Activities:

A community advisory board (CAB) has been formed for the site and meets on a regular basis. Details of meeting agendas and minutes can be viewed at the ADEQ website. These meetings are open to the public.

Site History:

1985: Motorola began investigation of the 56th Street facility. Investigations were conducted in stages and included:

    • Investigation of possible source locations     
    • Soil borings and sampling program
    • On and off-site soil gas investigations
    • Off-site soil gas investigation identified five potential source areas for volatile organic compound (VOC) contamination
    • Installation of 39 groundwater monitor wells (including three multi-port monitor wells)
    • Groundwater sampling program (currently semi-annual)
    • Aquifer tests and groundwater modeling
    • Investigation of inorganic constituents found in groundwater

1989: The site was originally investigated as part of the Motorola 52nd Street National Priorities List Superfund Site. However, groundwater data indicated there were two separate and distinct areas of contamination. Therefore, the site was disassociated from the larger Motorola 52nd Street site.

1993 - 1996: The following ERA activities have been conducted by Motorola:

  • Abandonment of on-site drywells (1993)
  • Pilot scale bioremediation test operations
  • On-site soil vapor extraction system installed (1994)
  • On-site soil excavation (1996)

1997: Following an on-site confirmation soil gas investigation, ADEQ granted a soil No Further Action determination to Motorola.

2004: The site was placed on the WQARF Registry on June 2nd, due to the presence of PCE and TCE in the groundwater at levels that exceeded the Arizona Aquifer Water Quality Standard of 5.0 mg/l. The eligibility and evaluation score for placement on the WQARF Registry was 40 out of 120.

2005: Freescale Semiconductor, Inc. (a successor company to Motorola) installed additional monitor wells during the Third Quarter to the west and southwest of TCE contaminant plume to further delineate the extent of groundwater contamination. Following installation and sampling of these wells, an ERA evaluation was conducted.

2006: Freescale agreed to implement an ERA evaluation to evaluate potential impact to a downgradient SRP well for the site. The maximum PCE and TCE levels present in the groundwater were 46 µg/L and 770 µg/L , respectively.

2007: Freescale tentatively selected the use of a groundwater extraction and treatment system to address the contaminant plume. The system will employ granular activated carbon to remove contaminants from the groundwater prior to discharge to the Grand Canal.

2008: Freescale was involved in negotiations with the various landowners of the land adjacent to the Grand Canal that would be the site of the extraction and treatment system.

2009: Freescale prepared a work plan describing the installation and development of two groundwater extraction and two groundwater monitoring wells on the north side of the Grand Canal. The four wells comprise the first phase of the ERA to contain and control groundwater contamination in the area.

2010 - 2012 Freescale entered into a Consent Order with ADEQ on April 22, 2011 to design and implement an ERA. Freescale collects groundwater samples and water level data from 41 monitor wells in April and October. Freescale and Clear Creek Associates continue to work on the permitting and environmental clearances required to construct the groundwater pump and treat system. Freescale is also providing monthly reports to ADEQ on the progress of the ERA.

2013: Freescale plans to complete construction of the groundwater pump and treat system in the fall.  Freescale will conduct operation and maintenance of the system based on the pending agreement with ADEQ.  Groundwater samples and water level data were collected by Freescale in April and another set will be collected in October. Freescale is providing monthly progress reports to ADEQ on the status of the ERA.

2014: The ERA groundwater pump and treat system began operation in November 2013. Freescale submitted a Site Operation and Maintenance Plan for the ERA which ADEQ approved in October 2014 after a 30 day public comment period. Freescale will conduct operation and maintenance of the system based on a pending agreement with ADEQ. A Consent Order for the Remedial Investigation and Feasibility Study reports is under negotiation between ADEQ and Freescale. Groundwater samples and water level data were collected by Freescale in April and October.

2015: Freescale will continue to operate and maintain the groundwater pump and treat system as the ERA based on a Consent Order with ADEQ. Freescale and ADEQ also agreed to terms on a Consent Order for Freescale to perform the Remedial Investigation and Feasibility Study for the site. Groundwater samples and water level data will be collected by Freescale in April and October.


The current contaminants of concern in groundwater include PCE and TCE. Contaminants of concern at the site may change as new data become available.

Public Health Impact:

There is no known public health impact to drinking water because there are no known drinking water wells in the area of the contaminant plume. A public health consultation completed by the Arizona Department of Health Services determined that there is no public health threat associated with the use of water from the private irrigation wells located in the vicinity of the site. All owners of the private irrigation wells are aware that these wells are not suitable for public drinking water purposes.

Site Hydrogeology:

The depth to groundwater in the area ranges from approximately 13 to 80 feet below ground surface. Groundwater flow in the site area is to the southwest.


Name Phone/Fax E-mail
Nichole Osuch, ADEQ Project Manager (602) 771-4847*/(602) 771-4138 fax [email protected]
Wendy Flood, ADEQ Community Involvement Coordinator (602) 771-4410*/(602) 771-4236 fax [email protected]

*In Arizona, but outside the Phoenix area, call toll-free at (800) 234-5677.

Online Information Repository:

Interested parties can review site information here on this page and at the ADEQ Record Center located at 1110 W. Washington Street, Phoenix, Arizona. Please contact (602) 771-4380 or (800) 234-5677 ext. 6027714380 for hours of operation and to schedule an appointment. To review site information at a location near you, please contact the designated Community Involvement Coordinator.

Fact Sheet

Site Map

Registry Report

Investigation Summary Report

CAB Meeting Agendas and Minutes

Groundwater Remediation System Operation and Maintenance Manual