Pacific Southwest, Region 9: Superfund
Serving Arizona, California, Hawaii, Nevada, the Pacific Islands, and Tribal Nations
CTS Printex Inc.
EPA #: CAD009212838
County: Santa Clara
City: Mountain View
Congressional District: 14
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.
On this page
Description and History
NPL Listing History
NPL Status: Final
Proposed Date: 06/24/88
Final Date: 02/21/90
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 5½-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.
Contaminants and Risks
- 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.
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.
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.
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 e xpected to start in 2018 .
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.
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:
Documents and Reports
|Original Compilation & Suppl #1|
|Remedial AR, Update #2|
|06/01/11||EPA Seeks Public Comments on Proposed Plan to Amend 1991 Cleanup Plan|
|09/01/15||Groundwater Investigation and Sampling|
|06/28/91||Record of Decision|
|09/30/11||Record of Decision Amendment- CTS Printex & Appendix|
|09/30/11||Record of Decision Amendment - Appendices|
|09/30/11||Record of Decision Amendment - CTS Printex|
|09/30/05||Second Five Year Review|
|09/07/10||Third Five Year Review|
|05/01/11||Final Focused Feasibility Study - Part I - Vapor Intrusion|
|05/01/11||Final Focused Feasibility Study - Part II - Groundwater|
|05/01/11||Final Supplemental Remedial Investigations|
|09/22/15||Fourth Five year Review|
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.
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
EPA Site Manager
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Community Involvement Coordinator
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Public Information Center
After Hours (Emergency Response)