national semiconductor corp.

2900 SEMICONDUCTOR AVE

The National Semiconductor Corporation (National Semiconductor) manufactures electronic equipment at this 50-acre site. Underground storage tanks, sumps, and pipes are the suspected sources for contaminated groundwater and soil. Since 1982, National Semiconductor has closed its leaking tanks, instituted a groundwater pump and treat system, and removed contaminated soil from selected areas of the facility. The contaminants of concern are primarily chlorinated organic solvents, which, along with other nearby National Priority List (NPL) sites, have contaminated a common groundwater area. Although these nearby sites are listed separately on the NPL, the cleanup activities at some of the sites are being coordinated as part of an area-wide cleanup approach. Approximately 300,000 people live within 3 miles of the site and depend on groundwater as a source of drinking water.

Hazardous Ranking Score

36 / 100

A score of 28.5 or higher qualifies a site for the Superfund National Priority List.

Regional Contact

Region 9
Phone: (415) 947-4251

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Timeline

Discovery
Site Inspection
Preliminary Assessment
Final Listing On NPL
Removal

Contaminants & Health Effects

      Carcinogen
      Endocrine Disrupter
      Neurotoxic
      Sensitiser
      Reproductive Toxin
      Persistent, bioaccumulative and toxic
      VOC
      Mutagen

        Census

        White
        African American
        Asian
        American Indian and Alaska Native
        Native Hawaiian
        Other

        12,084

        People living
        within a 1 mile radius

        $81,667

        Average Income

        4,602

        Occupied homes

        Potentially Responsible Parties

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