Pacific Southwest, Region 9: Superfund
Serving Arizona, California, Hawaii, Nevada, the Pacific Islands, and Tribal Nations
Fairchild Semiconductor Corp. (South San Jose Plant)
EPA #: CAD097012298
County: Santa Clara
City: San Jose
Congressional District: 16
Other Names: Fairchild Camera and Instrument Corporation Schlumberger Technology Corporation
EPA is currently evaluating the potential for vapor intrusion in buildings overlying the shallow groundwater contamination area. On December 3, 2013, EPA sent a letter to the State of California's Regional Water Quality Control Board providing guidelines for vapor intrusion sampling and evaluation at this and 10 other South Bay State-lead sites.
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Description and History
NPL Listing History
NPL Status: Final
Proposed Date: 10/15/84
Final Date: 10/04/89
The 22-acre Fairchild Semiconductor Corp. facility (former South San Jose Plant or Site) is located west of Highway 101 about nine miles southeast of downtown San Jose near the intersection of Monterey Highway and Highway 85. The Site is located in a light industrial and commercial area. The plant was constructed between 1975 and 1977 and used for electronics and semiconductor fabrication from 1977 to 1983. Solvents containing volatile organic compounds (VOCs; primarily 1,1,1-TCA) were used at the Site. Other chemicals, such as acids, were also used and stored at the Site. The Site was vacant from 1983 until it was redeveloped and reoccupied in 2000. Fairchild’s parent company, Schlumberger Technology Corporation (STC), sold Fairchild to National Semiconductor Corporation in 1987 and sold the Site property to a commercial developer in 1990. The Site was redeveloped to retail shopping (commercial) by parties other than STC in 2000. STC has remained the responsible party for Site cleanup.
Initial investigations were conducted in November/December 1981 and determined that compounds of concern (COCs) were in soil and groundwater at the Site. The investigation identified a single source: a 5,940-gallon underground waste storage tank. The COCs included 1,1,2-trichloro-1,2,2-trifluoroethane (Freon 113), 1,1,1-TCA, acetone, isopropyl alcohol, tetrachloroethene, xylenes, and 1,1-DCE, which is a degradation product of 1,1,1-TCA.
In 1981, samples from Great Oaks Water Company drinking water supply well GO-13, located down-gradient from the Site, contained 1,1,1-TCA. 1,1,1-TCA was one of the COCs detected in soil and groundwater near the underground tank at the Site. Well GO-13 was taken out of service in December 1981 and used for remediation until it was sealed in October 1986.
Remedial action at the Site began in 1982 with the removal of the underground waste storage tank and associated piping. Additional facilities that were removed in 1982 included an acid waste tank, concrete holding vault, concrete slab beneath the former waste solvent tank, and a temporary waste solvent tank. After removal of the underground waste storage tank in 1982, about 3,400 cubic yards of soil were excavated from the vicinity of the tank to a total depth of 52 feet below grade. Groundwater extraction at the Site was also initiated in 1982 to control migration of COCs.
In 1986, Fairchild constructed a slurry cut-off wall around the Site to a maximum depth of 148 feet to create a physical barrier to prevent off-property migration. Groundwater extraction and treatment (GWET) continued inside and down-gradient from the slurry wall enclosure until 1998 and 1991, respectively. Soil excavation and construction of the slurry wall were complete and the GWET system and groundwater monitoring program were implemented by the time the Final Site Cleanup Requirements Order (SCR) was adopted in 1989.
As indicated above, groundwater remediation began at the Site in 1982. Fairchild identified and closed all supply wells in the area that were impacted by COCs. With concurrence from the Regional Water Board, Fairchild suspended groundwater extraction and treatment in July 1998 after demonstrating that asymptotic VOC concentrations and other conditions had been reached. During operation of the GWET system between 1982 and 1998, a total of 93,285 pounds of VOCs were removed from groundwater.
A soil vapor extraction and treatment (SVET) system was operated at the Site in 1989 and 1990 to treat and remove COCs in air pores located in soil above groundwater. The SVET was removed in 1995 with Regional Water Board approval when Fairchild demonstrated that soil cleanup standards established in the SCR had been achieved. A total of 15,906 pounds of VOCs were removed by SVET.
In total, approximately 147,000 pounds of VOCs were removed from the Site through soil excavation, groundwater extraction, and soil vapor extraction. In 1998, the Regional Board approved suspension of active remediation at the Site. Fairchild has continued monitoring of on-Site and off-Site groundwater and of the slurry cut-off wall since 1998 and provided annual reports to the Regional Water Board.
Contaminants and Risks
- Soil and Sludges
COCs in soil and groundwater were discovered in 1981. The potential threat of direct contact with contaminated soil has been eliminated through initial actions. All private supply wells located in the area surrounding the site have been sealed or abandoned. The plume of groundwater containing COCs has been significantly reduced through extraction, treatment, and natural attenuation, and the potential health threat posed by ingesting groundwater contaminants continues to decrease. In 2009, the Regional Water Board and EPA evaluated the potential for COCs migrating through vapor intrusion (VI) into surface uses at the Site. The evaluation found no unacceptable risk of VI. At the request of the Regional Water Board and EPA, Fairchild re-evaluated the potential VI risks in 2014. Fairchild’s evaluation concluded that residual COCs in groundwater do not present a health risk to on-Site or off-Site buildings from VI. EPA and the Regional Water Board are currently reviewing Fairchild’s conclusions regarding the VI pathway.
Who is Involved
This site is being addressed through Federal, State, and potentially responsible parties' actions.
Initial Actions: Fairchild implemented several initial cleanup actions that have decreased the extent and magnitude of groundwater contamination in the area. In 1981, a leaking underground tank was removed. In 1982, approximately 3,400 cubic yards of contaminated soils were removed to a depth of 52 feet. Between 1982 and 1998, on- and off-Site groundwater extraction wells operated to control the migration of groundwater COCs and remove COC mass. Between 1982 and 1986, pre-existing supply wells that were potential pathways for COC migration to deeper groundwater were sealed. A slurry wall was built around the perimeter of the Site in 1986 to prevent off-Site migration of COCs.
Entire Site: Between 1982 and the issuance of the Final Site Cleanup Requirements Order (SCR) in 1989, the potentially responsible party had investigated the nature and extent of COCs at the Site, and commenced initial cleanup actions described above. The following cleanup remedies were selected in the SCR: treating on-Site soil using a vapor extraction process; continued pumping on-Site shallow groundwater and off-Site groundwater and treating it using air stripping and carbon adsorption, followed by on-Site reinjection of the treated groundwater; pumping deep groundwater from off-Site wells, followed by air stripping and discharging to surface water using storm drains, or reuse of the treated groundwater for road construction and irrigation; conducting laboratory and field studies to determine the effectiveness of biodegradation on on-Site chemicals; implementing deed restrictions to limit groundwater and land use; and monitoring groundwater. Groundwater monitoring and the deed restrictions remain active. The other cleanup remedies have ceased with Regional Water Board approval or are complete.
In response to a Unilateral Order from the State, Fairchild is taking action to contain and reduce the contaminated groundwater plume.
Cleanup Results to Date
Construction of all cleanup remedies has been complete since 1992. The removal and treatment of soil, the closure of private wells, the operation of the groundwater treatment system, and the installation of the slurry wall have reduced the potential for exposure to hazardous substances at the Site. Natural attenuation has also reduced concentrations of COCs in groundwater over time. Of the seven Site COCs, only 1,1-DCE (a degradation product of an original solvent used at the Site) was regularly detected above groundwater cleanup goals between 2009 and 2013. During this period, only one off-Site monitoring well was regularly above the cleanup goal of a hazard index of 0.25.
The fourth Five Year Review was completed in September 2009 and concluded that:
The remedy at the Site at 101 Bernal Road in San Jose, California is currently protective of human health and the environment. The groundwater plume has been reduced and contained. In the meantime, institutional controls are in place to prevent exposure. There is no exposure risk from vapor intrusion. To be protective in the long term, however, the Fourth Five Year Review required evaluation of alternative remedies or improvements to the existing system. That evaluation was prepared by Fairchild and submitted to the Regional Board and EPA in a Draft Focused Feasibility Study in June 2011. The fifth Five Year Review for the remedy at the Site will be released in 2014.
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.
Fairchild’s parent company, Schlumberger Technology Corporation (STC), sold Fairchild to National Semiconductor Corporation in 1987 but remains the responsible party for Site cleanup.
Documents and Reports
|12/01/13||South Bay Groundwater Sites - Vapor Intrusion Evaluations (Dec. 2013 Update)|
|03/20/89||Record of Decision|
|03/13/95||First Five Year Review Report|
|07/14/99||Second Five Year Review Report|
|09/30/04||Third Five Year Review Report|
|09/30/09||Fourth Five Year Review|
|10/11/13||Draft Groundwater Focused Feasibility Study|
|11/06/13||2013 Annual Status Report|
|12/03/13||EPA Region 9 Guidelines and Supplemental Information Needed for Vapor Intrusion|
Evaluations at the South Bay National Priorities List (NPL) Sites - Letter
|12/20/13||Requirement for Vapor Intrusion Evaluation and Screening Level Risk Assessment Report - Letter|
|01/31/14||Fifth Five Year Review Report|
Public Information Repositories
The public information repositories for the site are at the following locations:
Regional Water Quality Control Board,
San Francisco Bay Region
2101 Webster Street, Suite 500
Oakland, CA 94612
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
1515 Clay Street
Oakland, CA 94612
After Hours (Emergency Response)