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Mountain View on the Move

Firms to pay $3 million for groundwater cleanup in MV

The U.S. Environmental Protection Agency reached a settlement with CTS Printex Inc. and ADN Corp. to complete the remaining groundwater contamination cleanup at the CTS Printex Superfund Site in Mountain View.

The companies will spend a total of approximately $2 million on a system to monitor and treat low levels of contaminated groundwater that remain on the site. They will monitor the property to ensure that vapor intrusion – a process where subsurface contaminants volatize and enter the air of overlying buildings – does not impact residents of current or future buildings on the site.

The settlement also provides reimbursement of $850,000 to the EPA for costs of the cleanup activities.

“Our goal is to protect the people living and working in this community from the harmful effects of vapor intrusion,” said

Jared Blumenthal, the EPA’s regional administrator for the Pacific Southwest. “This settlement requires the final cleanup of the groundwater, eliminating the potential for contaminants to enter homes and buildings.”

CTS Printex and its corporate predecessor Printex Corp. operated a circuit-board manufacturing facility on a portion of the site between 1970 and 1985. Those operations involved the use of various industrial solvents, including trichloroethylene (TCE), which contaminated soils and groundwater on and off the property. ADN owned the property where the manufacturing facility was located.

A groundwater cleanup system operated for nearly 10 years under the initial cleanup plan, treating more than 100 million gallons of groundwater to reduce the size of the TCE groundwater plume. In 2011, the EPA amended the cleanup plan for both groundwater and vapor intrusion. The current remedy restricts groundwater use and requires a building permit review process for new developments to prevent future exposures to site contaminants.

In addition, the groundwater remedy incorporates bioremediation and monitored natural attenuation to meet the cleanup standards. The vapor intrusion remedy requires maintenance of current control systems as well as the installation of potential future controls, depending on future land uses.

CTS Printex is one of 23 Superfund sites in Santa Clara County the EPA is currently working on. The EPA has cooperated with its state and local partners to address groundwater contaminated by historical releases of chlorinated solvents, primarily TCE, throughout the county and expanded vapor intrusion evaluations and mitigation in residential and commercial buildings.

For more information, visit epa.gov/oswer/vaporintrusion or epa.gov/superfund/sites/npl/nar1126.htm.

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