WATKINS-JOHNSON CO. (STEWART DIVISION PLANT)
SCOTTS VALLEY, CA
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The plant on the 3-acre Watkins-Johnson Company (Stewart Division) site in Scotts Valley, California, began to manufacture industrial furnaces and electrical parts in 1963. Contamination probably resulted from improper handling of hazardous waste generated during plant operations. Following construction of the remedy, operation and maintenance activities and monitoring are ongoing.
What Has Been Done to Clean Up the Site?
The site is being addressed through federal and PRP actions.
What Is the Current Site Status?
Construction of all remedies is complete. Pumping and treating contaminated groundwater has reduced the size of the plume and the threats posed to the nearby population. The soil vapor extraction and treatment system has reduced concentrations of volatile organic compounds (VOCs) in the soil so that they no longer present a threat to the groundwater.
Interim Actions: In response to a Cleanup and Abatement Order from the California Regional Water Quality Control Board, the potentially responsible party (PRP) began an interim program to pump and treat contaminated groundwater in 1986. Current groundwater monitoring data show that the extraction network has successfully stopped the migration of the VOC plume.
Entire Site: The selected long-term remedy includes installing a soil vapor extraction system, installing a groundwater extraction and treatment system, treating the extracted groundwater with granular activated carbon and discharging the treated groundwater into nearby Bean Creek, and monitoring the groundwater and soil. Construction of the treatment systems finished in late 1994. Groundwater cleanup will continue until groundwater meets established cleanup goals. Optimization of the groundwater remedy will help meet cleanup goals.