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Pacific Southwest, Region 9: Superfund

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

Advanced Micro Devices, Inc.

EPA #: CAD048634059

State: California(CA)

County: Santa Clara

City: Sunnyvale

Congressional District: 14

Other Names: AMD 901 / 902 AMD - Thompson Place

Bulletin Board

EPA is currently evaluating the potential for vapor intrusion in buildings overlying the shallow groundwater contamination area. On December 3, 2013, EPA sent a letter to the State of California's Regional Water Quality Control Board providing guidelines for vapor intrusion sampling and evaluation at this and 10 other South Bay State-lead sites.

Description and History

NPL Listing History

NPL Status: Final

Proposed Date: 10/15/84

Final Date: 06/10/86

Deleted Date:

The Advanced Micro Devices, Inc. (AMD) site covers 6 acres in Sunnyvale, where the company manufactures electronic equipment. Contamination of the groundwater resulted from localized spills and leaking underground storage tanks and piping. Nearby facilities have contributed to the contaminated groundwater plume and are participating in the cleanup of this site. These facilities, Advanced Micro Devices (Building 915) and TRW Microwave Inc., are also sites on the NPL. A third site, Signetics, Inc., has been removed from the NPL, but the potentially responsible parties continue to assist in cleanup of the groundwater by order of the Regional Water Quality Control Board. Approximately 50,000 people live within three miles of the site, and about 300,000 people depend on nearby municipal groundwater wells as a source of drinking water. The closest residence is mile away. No private wells are used in the vicinity of the facility. The municipal wells, located about mile from the site, do not show signs of contamination.

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Contaminants and Risks

Contaminated Media
  • Groundwater
  • Soil and Sludges

Groundwater contains volatile organic compounds (VOCs) such as trichloroethylene (TCE) and Freon. Soils also are contaminated with VOCs. People who come in direct contact with or accidentally ingest contaminated groundwater or soil may be at risk.

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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

Initial Actions

Immediate Actions: Following the removal of two acid neutralization tanks, AMD established a groundwater extraction and treatment system. AMD is continuing to participate with Signetics and TRW in extracting and treating contaminated groundwater with air stripping technology followed by carbon adsorption.

Cleanup Ongoing

Entire Site: Under State supervision, AMD completed an investigation determining the nature and extent of contamination on the site. The EPA selected the cleanup remedy in late 1991. The remedy calls for excavating contaminated soil followed by off-site incineration, continuing the ongoing operation of the existing groundwater extraction and treatment system, and installing new wells at the leading edge of the off-site commingled plume. Incineration of the soil and well installation were completed in late 1992.

In 1984, the State issued a Cleanup and Abatement Order, requiring Advanced Micro Devices, Signetics, and TRW Microwave to develop a joint plan to prevent the further migration of contaminants. A new order was issued in April 1989, requiring an investigation with the neighboring TRW and Signetics sites. This order did not include AMD Building 915, which is an adjacent, but separate, NPL site.

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Cleanup Results to Date

Construction of all cleanup remedies is complete at the Advanced Micro Devices, Inc. site. The removal of underground tanks, contaminated soil, and ongoing operation of the groundwater treatment system is helping to keep the contaminant levels within acceptable limits and is preventing the further spread of contaminants.

The most recent Five Year Review was completed in September 2009 and concluded that:
The remedy at the Advanced Micro Devices, Inc. (AMD) Superfund site at 901/902 Thompson Place in Sunnyvale, California is currently protective of human health and the environment. Although the GWETS has been turned off, the ISB groundwater program, currently in passive mode, is continuing to make progress towards groundwater restoration. In the meantime, institutional controls are in place to prevent exposure to contaminated groundwater. There is no exposure risk from vapor intrusion. To be protective in the long-term, a strategy should be developed to assess the risk of future vapor intrusion if site occupancy changes. Additionally, the Record of Decision and final Site Cleanup Requirements will need to be amended to reflect the groundwater remedy change.

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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.

Online information about the PRPs for the site is not yet available.

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Community Involvement

Public Meetings:

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Public Information Repositories

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

Regional Water Quality Board
San Francisco Bay Region
2101 Webster Street, Suite 500
Oakland, CA 94612

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

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EPA Site Manager
Melanie Morash
US EPA Region 9
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Community Involvement Coordinator
Alejandro Diaz
US EPA Region 9
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Public Information Center
State Contact
Max Shahbazian
California Regional Water Quality Control Board
1515 Clay Street
Suite 1400
Oakland, CA 94612
PRP Contact
Community Contact
Other Contacts
After Hours (Emergency Response)
(800) 424-8802

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