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Pacific Southwest, Region 9: Superfund

Serving Arizona, California, Hawaii, Nevada, the Pacific Islands, and Tribal Nations

Motorola, Inc. (52nd Street Plant)

EPA #: AZD009004177

State: Arizona(AZ)

County: Maricopa

City: Phoenix

Congressional District: 01

Other Names: Motorola 52nd Street; Motorola, Inc. Discrete Semiconductor

Bulletin Board

Join EPA, ADEQ, the Arizona Department of Health Services, and the Arizona Cancer Registry for the next Motorola 52nd St. CIG meeting

Wednesday, May 13, 2015
5:45 - 8:45pm
Balsz School District Board Room
4825 E Roosevelt St, Phoenix, AZ


Description and History

NPL Listing History

NPL Status: Final

Proposed Date: 10/15/84

Final Date: 10/04/89

Deleted Date:

The Motorola, Inc. (52nd Street Plant) Superfund Site (Site) is a large area of contaminated groundwater extending from the former Motorola facility and other sources. The responsible parties have operated various soil gas and interim groundwater treatment systems since the early 90’s that have reduced contamination. In addition, vapor intrusion mitigation has been installed at 15 homes. EPA and Arizona Department of Environmental Quality (ADEQ) are working to develop final cleanup actions over the next few years.

The Site is located in Phoenix, Arizona, generally between 52nd Street on the east, Palm Lane on the north, 7th Avenue on the west, and Buckeye Road on the south. Because of the size of the site, it has been divided into three areas called Operable Units (OUs) in order to better manage the cleanup efforts (click here to see Site Map).

ADEQ is the lead agency for activities in OU1 and OU2 with the exception of the vapor intrusion/indoor air investigation in OU1 and OU2. EPA is the lead agency for OU 3.

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Contaminants and Risks

Contaminated Media
  • Groundwater
  • Air
  • Soil and Sludges

EPA and ADEQ identify Contaminants of Concern (COCs) during the RI/FS process that help drive cleanup decisions at a site. At the Motorola 52nd Site, past studies have identified Volatile Organic Compounds (VOCs) as the COCs that are currently driving cleanup. Under the classification of VOC, Trichloroethene (TCE) and Tetrachloroethene (PCE) are the two specific contaminants of concern. EPA and ADEQ are currently gathering information across all OUs and may be adding COCs.

Various measures have been put into place to reduce groundwater migration and contamination, and to prevent soil exposure. EPA has also been studying the possibility for soil vapor from contaminated groundwater to migrate into buildings and impact indoor air. In OU1, Freescale Semiconductor, Inc. (Freescale, an independent company spun off from Motorola in 2004), has sampled 115 residences, 4 schools and 7 commercial buildings with EPA oversight. Freescale also installed sub-slab depressurization systems at 15 homes and apartment units and successfully reduced TCE concentrations to below 2ug/m3 in those homes/buildings.

In the Phoenix area, drinking water is provided primarily though surface water (95%) and limited groundwater (5%) from areas located outside of the the Motorola 52nd Street Superfund Site.

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Who is Involved

This site is being addressed through Federal, State, and potentially responsible parties' actions.

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Investigation and Cleanup Activities

In the past, chemicals were spilled/leaked at the former Motorola plant at 52nd Street and McDowell Road, the Honeywell facility at 34th Street and Air Lane, and potentially at other facilities in the area. These chemicals seeped downward through the ground and mixed with the groundwater and formed a wide spread groundwater plume toward the west. Freescale and Honeywell (the Companies) have been working to investigate and cleanup the contamination. ADEQ and EPA closely monitor all work performed by the Companies at this site.

The Site was proposed for the National Priorities List (NPL) in October 1984 and placed on the final NPL in November 1989 to investigate the presence of soil and groundwater contamination by chlorinated solvents (more information on Site contaminants can be found below).

Initial Actions

1st Interim Remedy 1988

In 1988, prior to final listing, ADEQ and USEPA approved a groundwater recovery and treatment system as an interim remedy known as OU1. In 1989, ADEQ and Motorola entered into a consent order requiring Motorola to design and implement groundwater and soil remedies. The full-scale treatment system was constructed in 1992 and designed to restrict contaminant migration at the Crosscut Canal along 46th Street, and to reduce the levels of contamination at the Motorola facility. Since 1992, Motorola/Freescale has been operating and maintaining the system under ADEQ oversight.

Initial Actions

2nd Interim Remedy 1994

In 1994, ADEQ and USEPA selected a second interim remedy near 20th and Washington Streets designed to contain and treat the groundwater contamination in the OU2 area. ADEQ signed a Consent Decree with Motorola for the remedial design of OU2 in 1996. The design was completed and approved in December 1999. USEPA signed the Explanation of Significant Differences to the OU2 Record of Decision (ROD) in September 1999 to describe the changes in water treatment technology and end-use of the treated water. USEPA issued a Unilateral Admistrative Order to Freescale and Honeywell in November 1998 for the construction of the OU2 treatment system and operation and maintenance of the system for two years.

This Order was amended in December 2003 to provide for long-term operation and maintenance of the system by the Companies. The OU2 treatment system construction began in March 2000 and was completed in October 2001.

The OU2 treatment system became fully operational in December 2001. The Companies are responsible for the operation of this system under ADEQ and EPA oversight. Also in OU2, Honeywell, has been conducting an investigation of soil and groundwater contamination at its facility. ADEQ and Honeywell entered into an administrative order on consent (AOC) in September 1999 to conduct a remedial investigation (RI) at the 34th St. Facility. The AOC required Honeywell to investigate its potential source areas and to define the full extent of its contamination at and emanating from the 34th St. Facility. Honeywell completed this RI in 2008 and completed a baseline Human Health Risk Assessment in 2012.

Site Studies

2012 Human Health Risk Assessment – OU2

As part of the human health risk assessment, a workplan for an indoor air vapor intrusion investigation at the Honeywell 34th street facility began in 2011. Honeywell discovered a jet fuel plume at their facility that was mingling with the larger VOC plume. They installed a Biologically- enhanced Soil Vapor Extraction (BSVE) system to address the jet fuel plume in 2009 managed by the ADEQ Leaking Underground Storage Tank (LUST) Action under a corrective action plan. As of the first quarter of 2012 the BSVE system has removed in excess of 4,000,000 pounds of petroleum hydrocarbons and recently, removal rates have averaged over 5000 pounds per day indicating that the BSVE system is performing very well.

Cleanup Ongoing

Third Operable Unit

In 1997, USEPA and ADEQ established a third OU study area to address groundwater contamination downgradient of OU2. USEPA entered into an AOC with Honeywell and Arizona Public Service Company to perform the remedial investigation/feasibility study (RI/FS) for the OU3 Study Area in late 2009. The Remedial Investigation began in 2010.

Status: Source Investigations and Soil Gas Sampling near Soil Vapor Monitoring Well – 1 (SVMW-1) are planned in 2014. This investigation will help complete the groundwater investigation and, ultimately, the RI/FS with a target completion of summer 2015.

Cleanup Ongoing

Recent and Upcoming Activities in OU 1 and OU2

The OU1 and OU2 treatment plants have been effective in containing the plume and reducing concentrations of contaminants in most areas. However, the 2011 Five Year Review of the remedies concluded that there were several issues that needed to be addressed in order to get to a final remedy.

One major issue is addressing an ongoing source of contamination—dense non-aqueous phase liquid (DNAPL) that has seeped into fissures in bedrock—and the other is to complete the evaluation of the vapor intrusion pathway in OU1 and OU2.

In 2009, a Bedrock Pilot Study was initiated in order to evaluate the effectiveness of extracting DNAPL from bedrock using wells. The data from this study is still under review, and a conclusion as to how to proceed will be reviewed as more data is received.

In 2011, EPA entered into an agreement with Freescale to investigate the soil gas to indoor air pathway in OU1. Soil gas samples were taken first and analyzed for TCE and PCE. Because concentrations of TCE were above health-based screening levels, from 2011 to 2014 EPA followed up with subslab and indoor air sampling of homes, apartment buildings, and commercial buildings in the suspected area. Under EPA oversight, Freescale sampled 115 residences, 4 schools and 7 commercial buildings. Fifteen (15) mitigation systems were installed and are routinely monitored. Although 4 locations refused mitigation, all remaining homes now have levels below current health-based screening levels.

An investigation into whether vapor intrusion is occurring in OU2 is scheduled for 2014, following similar protocol as what was used in OU1.


OU1 – To assist in the bedrock study and help further identify groundwater and soil vapor conditions, additional groundwater and soil vapor monitoring wells were installed in late August 2013 through Fall 2013. Ongoing monitoring of the homes and apartment units equipped with indoor air mitigation systems will continue through 2016 when the frequency of monitoring will be evaluated based on the data gathered.

OU2 – In summer 2013, ADEQ will negotiate and sign a Statement of Work (SOW) and Administrative Order on Consent. This action will allow investigations on the RI to begin, as well as additional investigations on the potential for Vapor Intrusion.

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Cleanup Results to Date

The interim actions undertaken by Motorola and Honeywell have made the site safer while additional cleanup activities are being planned.

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Potentially Responsible Parties

Potentially responsible parties (PRPs) refers to companies that are potentially responsible for generating, transporting, or disposing of the hazardous waste found at the site.

Potentially Responsible Parties
The Motorola 52nd Street facility was originally constructed in 1956 and was in operation until the third quarter of 1999. Freescale has agreed to implement the requirements of the OU1 ADEQ consent decree (CD), the EPA Administrative Order of Consent for investigating and remediating the vapor intrusion pathway in OU1, and the OU2 EPA Unilateral Administrative Order (UAO).

The Honeywell 34th Street facility was constructed in 1951 and continues to operate today. Historically, the Honeywell facility has operated under the names of AiResearch Manufacturing Company of Arizona, Garrett Turbine Engine Company, and AlliedSignal Aerospace Company. Located on approximately 188 acres and consisting of more than 130 buildings, Honeywell and its predecessors have conducted jet engine design, assembly, testing, and repair at the site.

In 1992 and 2003, USEPA conducted Potentially Responsible Party (PRP) searches which identified numerous PRPs for the Site. As of January 2012, USEPA and ADEQ have entered into enforcement agreements with:

  • Freescale
  • Honeywell
  • Arizona Public Service
  • the Salt River Project
  • Phoenix Newpapers
  • Baker Metals
  • Adobe Air/Arvin Meritor/Cooper Industries
  • Walker Power
  • Kachina Joray, ITT
  • Canon

Other potential sources are under investigation to determine whether they contributed to the groundwater contamination and are responsible for investigation and cleanup.

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Documents and Reports

Hide details for Administrative RecordsAdministrative Records
11/01/92Final Remedial Investigation Report, Motorola 52nd St.
11/01/92Motorola 52nd St. Baseline Risk Assessment
10/27/11Third 5 Year Review Report for OU1 and OU2
Explanation of Significant Differences to OU#2 Record of Decision Suppl #2 AR
Hide details for Community InvolvementCommunity Involvement
01/01/09Jan. 2009 Community Involvement Plan
09/17/09Meeting presentations
05/17/10Community meeting presentations
05/17/10End-use presentation
05/17/10Meeting handouts
05/18/10TASC Technical Assistance Needs Assessment for M52 community
06/01/10AZ Dept. of Public Health Presentation
06/16/10CIG Draft Meeting Minutes
06/16/10CIG Meeting Minutes
06/16/10Presentations at CIG meeting
06/16/10What is a Community Involvement Group Presentation
09/22/109-22-2010 CIG draft meeting minutes
09/22/10CIG Bedrock Study presentation
09/22/10CIG Vapor Intrusion investigation update
09/22/10End-use for treated water update
09/22/10OU3 Well Announcement flyer
09/22/10OU3 Well drilling notification
12/09/10Soil Gas Sampling Work Plan Community Meeting minutes
12/10/10Soil Gas Sampling Community meeting presentations
01/26/11CIG Presentations: Superfund Process and Soil Gas Sampling OU1
01/26/11Community Informational Group (CIG) Application
01/26/11Draft CIG Meeting minutes, 1-26-2011
01/26/11TASC Presentation
03/04/11CIG meeting announcement and agenda
03/07/11OU1 Remedial Investigation Well locations map
03/23/11CIG final meeting minutes
03/23/11CIG March 2011 meeting presentations
03/23/11CIG Posters
03/23/11OU3 Remedial Investigation Well location map
06/08/11Posters from June 8 community meeting
06/08/11Presentations from June 8 community meeting
06/22/11CIG draft meeting minutes
06/22/11CIG Meeting Minutes--draft
06/22/11CIG meeting presentations
09/09/11Soil gas sampling results for OU1
09/15/11CIG Invitation and agenda, Sept. 21
09/27/11Draft CIG meeting minutes
09/27/11September 2011 CIG presentations and posters
10/18/11CIG announcement
11/10/11CIG Meeting Presentations 11-10-2011
11/10/11Draft CIG Meeting Minutes
01/05/12CIG Meeting Invitation and Agenda
01/25/12CIG Draft Meeting Minutes
01/25/12CIG Presentations
02/15/12Vapor Intrusion Update Meeting, posters and presentations
04/25/12CIG Meeting Minutes
04/25/12CIG meeting presentations and handout
08/01/12CIG Indoor Air and Sub-Slab Sampling Presentation
08/01/12CIG Vapor Intrusion to Indoor Air Meeting Presentation
04/24/13April 13 CIG Meeting Presentations - ADHS Health Studies, EPA OU1 Update, Repository Update
07/01/13Invitation to the Community Informational Group (CIG) Meeting / Invitación a la reunión al Grupo Comunitario de Información (CIG).
01/29/14July 2013 CIG meeting minutes
03/11/14April 2013 CIG meeting minutes
05/08/14April 2014 EPA CIG Meeting Presentation
06/02/14Motorola 52nd St. Community Involvement Plan
10/30/14October 2014 Community Informational Group Meeting - Additional Presentations

Hide details for Fact SheetsFact Sheets
11/01/99Construction Of Groundwater Treatment System Planned (English & Spanish)
02/01/00Construction Plans for Motorola (52nd Street) Superfund Site Cleanup (English/Spanish)
02/01/00Planes de construcción para la depuración del sitio Superfund de Motorola en 52nd Street
01/01/01Environmental Bulletin (English & Spanish)
02/01/01Environmental Bulletin( English/Spanish)
09/01/01Comments Requested on Groundwater Study(43k)
10/01/01EPA to Install Monitoring Wells in the Operable Unit Three Study Area
10/01/01EPA to Install Monitoring Wells in the Operable Unit Three Study Area.(English/Spanish)
01/01/02Environmental Bulletin
Bolletín Ambiente (English/Spanish)
09/01/021) This is to update you on the U.S. Environmental Protection Agency’s
groundwater investigation activities in the Operable Unit Three Study Area and to request your input on the next phase of this work. (English/Spanish).
2) Proposed Monitoring Well Locations Map.
03/01/03Environmental Bulletin
Boletín Medio Ambeiental (English/Spanish)
03/01/04Clean Up is Working at Operable Unit 2
02/01/05EPA and ADEQ Identify More Potentially Responsible Parties and Initiate Facility Investigations (English & Spanish)
08/01/05Meeting Notice
12/01/05Meeting Notice
04/01/06Public Comment for 5-Year Review
07/06/06Meeting Notice
05/01/07May 2007 Site Update
11/01/08November 2008 Site Update (in English y en español)
07/09/09Community Event - July 22, 2009.
09/01/09Boron Fact Sheet
09/01/09Community meeting announcement
09/01/09OU3 Administrative Order of Consent Press release
10/21/09Open House - New System to Cleanup Fuel Realeases in Soil Groundwater ( (in English y en español)
11/23/09United States Environmental Protection Agency Signs Agreement with Honeywell International Inc. and Arizona Public Service Company
01/04/10Open house announcement Feb. 11, 2010
04/28/10Motorola 52nd St. Superfund Site Important Announcements
05/26/10Motorola 52nd St. Brief Overview/background
09/09/10CIG Meeting Announcement / Aviso de reunión del Grupo Informativo Comunitario
11/26/10Community Meeting - Soil Gas Sampling Work Plan
01/07/11CIG Meeting Announcement / Aviso de reunión del Grupo Informativo Comunitario (CIG)
05/19/11Community Meeting - Open House / Reunión Pública y Jornada de puertas abiertas
06/10/11CIG Meeting Announcement / Aviso de reunión del Grupo Informativo Comunitario (CIG)
10/25/11Community Informational Group Meeting Announcement / Aviso de reunión del Grupo Informativo Comunitario (CIG)
12/02/11Five-Year Review Completed / La Revisión de cada Cinco Años está Completada
01/10/12Community Informational Group Meeting Announcement / Aviso de reunión del Grupo Informativo Comunitario (CIG)
01/23/12Community Meeting - Open House / Reunión Pública y Jornada de puertas abiertas
04/03/12Community Informational Group Meeting Announcement / Aviso de reunión del Grupo Informativo Comunitario (CIG)
04/23/12Update on Vapor Intrusion to Indoor Air Investigation at the Motorola 52nd Street Superfund Site (English/Spanish/Somali)
06/27/12ADEQ/EPA Notice Upcoming Environmental Work at the Semiray Facility / Aviso de ADEQ/EPAPróximo Trabajo Medioambiental en las Instalaciones Semiray
08/01/12Community Informational Group Meeting Announcement / Aviso de reunión del Grupo Informativo Comunitario (CIG)
10/03/12Community Informational Group Meeting Announcement / Aviso de reunión del Grupo Informativo Comunitario (CIG)
01/08/13Community Informational Group Meeting Announcement / Aviso de reunión del Grupo Informativo Comunitario (CIG)
01/18/13Community Informational Group Meeting Announcement / Aviso de reunión del Grupo Informativo Comunitario (CIG)
04/24/13April 24th - Motorola CAG Meeting Invitation - Agenda
01/29/14Winter 2014 Soil Gas Sampling and Investigation Activities - English
01/29/14Winter 2014 Soil Gas Sampling and Investigation Activities - Spanish
03/19/14Community Informational Group Meeting Announcement / Aviso de reunión del Grupo Informativo Comunitario (CIG)
Hide details for Legal DocumentsLegal Documents
07/07/09OU2 Consent Decree, Appendices, and Response to comments
Hide details for MapsMaps
07/01/08Groundwater plume map
03/01/12OU3 Well locations
Hide details for Records of DecisionRecords of Decision
09/01/88OU1 Record of Decision
10/01/94OU2 Record of Decision
10/01/99Explanation of Significant Differences for OU2
Hide details for Technical DocumentsTechnical Documents
10/01/95OU1 Five Year Review
10/01/01OU1 Five Year Review
10/01/01OU2 Five Year Review
08/01/02Motorola 52nd Street Superfund Site, Phoenix, AZ
10/01/06OU2 Five Year Review
11/01/06OU1 5 year review 2006
08/31/10OU1 Administrative Order of Consent for Vapor Intrusion
09/08/10OU3 RI/FS AOC and SOW
09/22/10OU3 Remedial Investigation Work Plan
02/01/11End-Use Report for OU1 treated water
06/15/11OU1 Effectiveness Report and comments
09/09/11OU2 Effectiveness Report
09/16/11Joint Air Toxics Assessment Project Final Report
09/27/11OU2 Five Year Review Addendum
09/29/11Honeywell Human Health Risk Assessment, and ADEQ/EPA comments
11/01/11Subslab and Indoor Air work plan for OU1 vapor intrusion investigation
11/18/11EPA and ADEQ Comments to Honeywell HHRA Tech Memo
11/22/11Validated Indoor Air and Sub-Slab Data for July Sampling Event
01/20/12Tech Memo: Honeywell Phase 2 Vapor Intrusion Assessment
02/02/12October Sampling Event: OU1 Validated Indoor Air and Subslab data
05/17/12Indoor Air, Sub-Slab and Outdoor Air Sample Results for July 2011, October 2011 and February 2012
06/04/12M52 Soil Gas Sampling report FINAL 2012-06-04
04/24/13OU1 Indoor Air, Sub-slab, and Outdoor Air Sample Results

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Community Involvement

Public Meetings: A new Community Information Group was formed in 2010 and meets regularly. The next meeting is scheduled for Wednesday, May 13, 2015, from 5:45-8:45pm (please arrive at 5:45pm if you are new to the Group and would like an introduction to the site). It will be at the Balsz Elementary School District Board Room, at 4825 E Roosevelt St, Phoenix, AZ 85008.

Please contact the Community Involvement Coordinator, Carlin Hafiz, at (213) 244-1814 if you or a local group would like to get more involved or would like to be added to the mailing list.

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Public Information Repositories

The public information repositories for the site are at the following locations:

Arizona Dept. of Environmental Quality,
Remedial Projects Unit
1110 W. Washington St.
Phoenix, AZ 85007-2935
(602) 771-4154

Phoenix Public Library,
Saguaro Branch
2802 North 46th Street
Phoenix, AZ
(602) 262-6801

Phoenix Public Library,
Central Branch
1221 N. Central Avenue
Phoenix, AZ 85004
(602) 262-4636

The most complete collection of documents is the official EPA site file, maintained at the following location:

Superfund Records Center

Mail Stop SFD-7C

95 Hawthorne Street, Room 403

San Francisco, CA 94105

(415) 820-4700

Enter main lobby of 75 Hawthorne street, go to 4th floor of South Wing Annex.

Additional Links

ADEQ's web site for the Motorola 52nd St. site: https://www.azdeq.gov/environ/waste/sps/Motorola_52nd_Street.html

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EPA Site Manager
Rachel Loftin
US EPA Region 9
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Community Involvement Coordinator
Carlin Hafiz
US EPA Region 9
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Public Information Center
(415) 947-8000 or toll-free (866) 372-9378
State Contact
Patrick Shinabery, OU1
Brian Stonebrink, OU2, Karin Harker, OU3
Wendy Flood, CIC
Patrick (602) 771-6801
Brian (602) 771-4197
Karin: (602) 771-0361
Wendy: (602) 771-4410
1110 W. Washington St.
Phoenix, AZ 85007-2935
PRP Contact
Jenn McCall
Troy Kennedy
(480) 814-4587
(973) 455-4279
Jenn McCall:
Troy Kennedy:
Community Contact
Our Community Involvement Plan contains a list of community contacts for this site. Please contact EPA or ADEQ for this information, or contact your local neighborhood association, group, or city councilman.
Other Contacts
After Hours (Emergency Response)
(800) 424-8802

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