Superfund Information Systems: Site Profile

Superfund Site:


Cleanup Activities

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The 56-acre former Fairchild Semiconductor Corp. (Mountain View) site is located in Mountain View, California. A facility on site manufactured semiconductors. The site is one of three Superfund National Priorities List (NPL) sites that are being cleaned up simultaneously. The other two Superfund sites are the Intel - Mountain View site and the Raytheon site. All three sites are located in the Middlefield-Ellis-Whisman (MEW) Study Area and are being addressed collectively as the MEW Site. Site investigations at several of these facilities during 1981 and 1982 revealed extensive soil and groundwater contamination, primarily volatile organic compounds (VOCs). Following immediate actions to protect human health and the environment, and construction of the site’s long-term remedy, operation and maintenance activities and monitoring are ongoing.

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What Has Been Done to Clean Up the Site?

The site is being addressed through federal and potentially responsible party (PRP) actions.

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What Is the Current Site Status?

Under EPA’s direction and oversight, the MEW Companies, including Fairchild Semiconductor Corp. and Schlumberger Technology Corp., implemented soil and groundwater cleanup programs that have included soil excavation and treatment, installation of four slurry walls, soil vapor extraction and treatment systems, and groundwater extraction and treatment systems. The soil cleanup by soil vapor extraction and excavation and aeration has been completed at all the former MEW facilities, including the former Fairchild facilities.

Groundwater cleanup will continue to operate for many decades in order to meet the trichloroethene (TCE) groundwater cleanup standard of 5 parts per billion. The MEW site groundwater remedy has removed over 76,000 pounds of contaminants, and has reduced contaminant concentrations throughout the multiple aquifer zones. The groundwater is not being used as a potable water supply, and there are no direct exposure pathways to the contaminated groundwater while groundwater cleanup continues.

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Emergency Response and Removal

Site cleanup has also included removal actions, or short-term cleanups, to address immediate threats to human health and the environment. Initial cleanup actions removed tanks from the site, removed and treated soil, sealed wells serving as potential conduits, and controlled groundwater movement by installing three slurry walls and 21 groundwater extraction wells.

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