Health Assessment for National Semiconductor Corporation, Santa Clara, Santa Clara County, California, Region 9. CERCLIS No. CAD041472986

摘要

The National Semiconductor Corporation site is on the National Priorities List. Underground storage tanks, sumps, and pipes are suspected to be the source of contaminated groundwater and subsurface soil. The environmental contamination on-site consists of tetrachloroethylene 1,1,1-trichloroethane, trichlorobenzene, benzene, methanol, and ethylbenzene and xylenes in subsurface soil; and trichloroethylene, 1,1,1-trichloroethane, xylene and acetone in groundwater. The environmental contamination off-site consists of 1,2-dichloroethylene in groundwater. The site is considered to be of potential public health concern because of the risk to human health caused by the possibility of exposure to hazardous substances via migration of contaminants from on-site subsurface soil and groundwater to off-site public water supply wells.