Tyco Electronics Facility - Proposed Remedies for Soil and Groundwater

Tyco Electronics Facility - Proposed Remedies for Soil and Groundwater

DTSC is approving the remedies for the on-site soil and groundwater contamination at the Tyco Electronics Corporation (Tyco) located at 300 Constitution Drive in Menlo Park, CA. The remedies are described in the Draft Corrective Measures Study and Implementation Plan for the Tyco facility dated June 2006, and Draft Land Use Covenant Implementation and Enforcement Plan: - Installing five new groundwater monitoring wells and abandon one well, according to all appropriate local and state standards including but not limited to the County of San Mateo, California State Department of Water Resources, and the Regional Water Quality Control Board. - Entering a land-use covenant for the entire site with special restrictions for the 11,437 sq. ft. engineered cap area, and conducting annual inspection of the site to ensure the land use remains unchanged. - Conducting periodic groundwater monitoring. Groundwater monitoring will include annual measurements of water level (gauge for depth) to conform flow direction and gradient, and field chemistry testing, including pH, conductivity, salinity, and oxidation-reduction potential. Any field test deviation result that is greater than 50% of the previous sampling event will trigger one round of groundwater analytical sampling and laboratory analysis at that well to determine if the chemical (VOCs and PCBs) concentrations have significantly changed. The new five wells will be sampled and analyzed for VOCs and PCBs annually for the first five years. Then the groundwater will be sampled and analyzed for VOCs and PCBs at a frequency of every 5 years for 20 years from a net work of 45 wells. Out of the 45 wells, 16 wells will be monitored for PCBs for an additional 30 years.

Menlo Park

San Mateo