101 BERNAL ROAD
The 22-acre Fairchild Semiconductor Corp. (Fairchild) 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. From 1979 until 1987, Fairchild was a wholly owned subsidiary of Schlumberger Technology Corporation (STC). STC sold Fairchild to National Semiconductor Corporation in 1987, but retained the Site. STC sold the Site to a commercial developer in 1990. The Site was redeveloped as a retail shopping center (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 of COCs. 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 providing annual reports to the Regional Water Board.
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