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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 former Advanced Micro Devices, Inc. (AMD) 901-902 Thompson Place Superfund Site (AMD 901/902 Site), part of the “Triple Site” in Sunnyvale, covers 6 acres, where the company formerly manufactured electronic equipment. The AMD Site is part of the “Triple Site” and neighbors multiple other sites, including: the TRW Microwave Superfund Site (TRW Site), the AMD 915 DeGuine Drive Superfund Site (AMD 915 Site), the Philips Semiconductors Site (Philips Site; formerly Signetics Inc.), which includes the properties at 811 Arques Avenue, 440 North Wolfe Road, and facilities along Stewart Drive, and the Mohawk Laboratories Site. A groundwater plume composed of volatile organic compounds (VOCs), including trichloroethene (TCE), extends from these sites more than a mile north in Sunnyvale to past Highway 101.
The AMD 901/902 Site is listed on the National Priorities List (NPL). Together with three other operable units (OUs), the AMD 901/902 Site was covered by a 1991 Record of Decision (ROD) for the Triple Site. The four OUs for the Triple Site are as follows:


    (1) The AMD 901/902 Site OU;
    (2) The Philips Site OU;
    (3) The TRW Microwave Site OU; and
    (4) The Companies Offsite Operable Unit (OOU), a commingled plume of contaminants which originated from the other three operable units (and has contributions from other sites in the area).
    At the time of adoption of the 1991 ROD, the OOU was defined as a 100-acre area, downgradient and north of the Triple Site in an area bounded by the Sunnyvale East Drainage Channel on the west and Santa Paula Avenue on the east, and as the area inside a 5 micrograms per liter (g/L) isopleth for trichloroethene (TCE) in groundwater. Over 100 residences and at least 4 schools are present within the OOU.

    Groundwater beneath the AMD 901/902 Site is contaminated with volatile organic compounds (VOCs), including trichloroethene (TCE), which resulted from localized spills and leaking underground storage tanks and piping. The nearby sites listed above also contributed to the contaminated groundwater plume and are participating in the cleanup of the Triple Site. Two of these sites – the AMD 915 Site and the TRW Site – are also listed on the NPL.

    The closest residence is located approximately 1,200 feet north of the AMD 901/902 Site. Drinking water is not affected by the contamination. Drinking water in this area comes from the Hetch Hetchy Reservoir in the Sierra Nevada Mountains, and is tested regularly to ensure that it meets all applicable state and federal drinking water standards.

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    Contaminants and Risks

    Contaminated Media
    • Groundwater
    • Soil and Sludges

    VOC contamination was historically present in soil but has since been remediated to below regulatory criteria. Currently, groundwater contains various VOCs, however, institutional controls are in place to ensure that no one can ingest or come in direct contact with contaminated groundwater.


    A vapor intrusion investigation was conducted at the one on-site building, which indicates that vapor intrusion into the building is occurring (a process whereby vapors from the contaminated groundwater move upwards through the soil and enter the indoor air of nearby buildings), but not above health-protective screening levels. EPA is in the process of evaluating the results of the vapor intrusion investigation and determining the need for any additional action.

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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 Philips and Northrop Grumman (the Responsible Party or RP for the TRW Site), 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 at the AMD 901/902 Site. EPA selected a cleanup remedy in late 1991, which called 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 AMD 901/902 Site. The removal of underground tanks and 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 AMD 901/902 Site is currently protective of human health and the environment. Although the groundwater extraction system has been turned off, the in-situ bioremediation 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.


    A vapor intrusion investigation was conducted at the one on-site building, which indicates that vapor intrusion into the building is occurring (a process whereby vapors from the contaminated groundwater move upwards through the soil and enter the indoor air of nearby buildings), but not above health-protective screening levels. EPA is in the process of evaluating the results of the vapor intrusion investigation and determining the need for any additional action.

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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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    Contacts

    EPA Site Manager
    Melanie Morash
    415-972-3050
    Morash.Melanie@epamail.epa.gov
    US EPA Region 9
    Mail Code SFD
    75 Hawthorne Street
    San Francisco, CA 94105
    EPA Community Involvement Coordinator
    Alejandro Diaz
    415-972-3242
    1-800-231-3075
    Diaz.Alejandro@epamail.epa.gov
    US EPA Region 9
    Mail Code SFD
    75 Hawthorne Street
    San Francisco, CA 94105
    EPA Public Information Center
    415-947-8701
    r9.info@epa.gov
    State Contact
    PRP Contact
    Community Contact
    Other Contacts
    After Hours (Emergency Response)
    US EPA
    (800) 424-8802

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