Approval of Modifications to the Final Remedy at the Teledyne MEC Site


SCH Number
Lead Agency
Toxic Substances Control, Department of (Department of Toxic Substances Control)
Document Title
Approval of Modifications to the Final Remedy at the Teledyne MEC Site
Document Type
NOE - Notice of Exemption

Document Description
DTSC is modifying the final remedy for the Teledyne MEC Site to include injection of potassium permanganate into shallow groundwater.

Contact Information
Janet Naito
Department of Toxic Substances Control Northern California
Coastal Cleanup Operations Branch 700 Heinz Avenue, Suite 200
Berkeley, CA 94710

Phone : (510) 540-3833


Palo Alto
Santa Clara

Notice of Exemption

Exempt Status
Type, Section or Code
Section 15061(b)(3)
Reasons for Exemption
The project will not have a significant effect on the environment because: 1. The groundwater extraction and treatment system downgradient of the treatment area will continue to operate and control the groundwater plume from this Site. Based upon the adjacent Hewlett-Packard Building 15 Site pilot study results, the potassium permanganate (KMNO4) will be used up before reaching the nearest operating downgradient extraction well, located approximately 125 feet away. Therefore, it will not interfere with the continued operation of the remainder of the extraction system. 2. The project is completely in-situ and will not pose any threat to the local air quality. The treatment zone underlies asphalted roadways and landscaping within a commercial development and groundwater occurs approximately 20 to 45 feet bgs. No hazardous air releases were detected during the adjacent Hewlett-Packard Building 15 Site pilot test. 3. The site is fully developed for research and development uses. The closest residence is over 0.25 miles away from the Site. There are no endangered species, either plant or animal, on the Site or in the site vicinity. 4. Shallow groundwater is not used for drinking water at the Site or in the Site vicinity. Drinking water to this area and the nearby residential community is provided by Hetch Hetchy. Groundwater wells installed in the Barron Park neighborhood approximately 0.25 miles away are generally used for irrigation. 5. Temporary injection wells will be installed and abandoned under permit from the Santa Clara Valley Water District. 6. The purple KMNO4 solution is a strong oxidizing agent. It is not volatile or flammable. Pre-mixed 5% KMNO4 solution will be delivered to the treatment area and stored in secondarily contained 1,000 gallon containers to prevent spillage.
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