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Pacific Southwest, Region 9: Superfund

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

CTS Printex Inc.

EPA #: CAD009212838

State: California(CA)

County: Santa Clara

City: Mountain View

Congressional District: 14

Other Names:

Bulletin Board

On 10/13/17, this website will no longer be updated. Site information will be migrated to the new web page at: http://www.epa.gov/superfund/ctsprintex .
EPA appreciates your patience through this transition. If you have questions, please contact EPA staff listed below.


Description and History

NPL Listing History

NPL Status: Final

Proposed Date: 06/24/88

Final Date: 02/21/90

Deleted Date:

The CTS Printex Superfund Site comprises a number of properties and is situated in the northwest corner of the Santa Clara Valley between the south end of San Francisco Bay and the Santa Cruz Mountains in the City of Mountain View, California. CTS Printex operated a printed circuit board manufacturing facility within a 5-acre portion of the area bounded by Plymouth, Colony, and Sierra Vista Streets from 1970 to early 1985. Metals and degreasing compounds (e.g., organic solvents) were discharged to soil and groundwater during CTS Printex’s manufacturing operations. Investigation and remediation, including soil excavation and groundwater extraction, were undertaken by CTS Corporation and Nearon Enterprises between 1985 and 1996.

The down gradient portion of the Site bounded by Plymouth Street and Sierra Vista Avenue still requires additional monitoring, investigation, and potentially remediation for volatile organic compounds (VOCs) in groundwater; however, residual concentrations of VOCs in groundwater have been decreasing and are anticipated to continue to decrease over time. For the up gradient portion of the Site, (Gables End, 1901-1950 Cambridge Drive, 841-862 Avery Drive, 1900-1929 Aberdeen Lane, 851-863 Donovan Way, 1901-1941 Newbury Drive) a risk management plan was developed, a restrictive covenant was recorded, and mitigation measures (e.g., vapor barriers and sub-slab ventilation systems) were implemented to address potential VOC concerns through the vapor intrusion pathway.

EPA amended the Record of Decision in September 2011. In 2014, EPA entered into a Consent Decree with CTS Corporation and ADN to implement the updated clean up.

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Contaminants and Risks

Contaminated Media
  • Groundwater
  • Soil and Sludges

On-property soils containing chlorinated VOCs have been remediated to concentrations meeting residential cleanup levels. Site-wide groundwater contains low levels of VOCs. The groundwater is not currently used as a source of drinking water.

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Who is Involved

EPA and CTS Printex are addressing VOCs, including trichloroethylene (TCE), in groundwater. Prior to 2006, the State of California was the lead regulatory agency for cleaning up the Site.

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Investigation and Cleanup Activities

Cleanup Ongoing

Cleanup of soil and groundwater was performed to remove residual sources of contamination on the former manufacturing area of the Site; however, low levels of VOCs remain in groundwater. EPA completed its fourth Five-Year Review for the site in September 2015.

Groundwater extraction and remediation has been completed on the original manufacturing portion of the Site. Monitoring of groundwater in this area will continue until VOC concentrations reach cleanup levels (e.g., drinking water standards). Sub-slab ventilation systems and vapor barriers have been installed beneath the new residential development to prevent the potential migration of VOC vapors from the underlying groundwater into the residences. In 2010-11, EPA assessed the vapor intrusion pathway and investigated off-property areas of the Site and proposed a new plan to remediate groundwater and address any vapor intrusion risk, if identified.

CTS Printex Corporation is planning to currently working on a Remedial Design Investigation to better characterize groundwater contamination before implementing the a Remedial Design and Remedial Action to address remaining groundwater contamination. The remedial design construction is expected to start in 2018.

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Cleanup Results to Date

Soil cleanup has been completed and the groundwater cleanup is ongoing. Concentrations of VOCs in groundwater are continuing to decrease over time. Vapor intrusion mitigation measures have been installed beneath the new residential development at the Site.

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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.

The named PRPs for this Site include:
CTS Corporation
Nearon Enterprises

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Community Involvement

Public Meetings: EPA held a community meeting in June 2011 to discuss the Proposed Plan to change the existing remedy at the CTS Printex Site.

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Public Information Repositories

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

City of Mountain View Public Library
585 Franklin St.
Mountain View, CA 94041
(650) 903-6337

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
Grace Ma
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
PRP Contact
Elie Haddad
Community Contact
Other Contacts
After Hours (Emergency Response)
(800) 424-8802

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