Health Assessment for Sulphur Bank Mercury Mine, Clearlake, Lake County, California, Region 9. CERCLIS No. CAD980893275.

摘要

The Sulphur Bank Mercury Mine Site is located on the eastern shore of the Oaks Arm of Clearlake, in the City of Clearlake, Lake County, California. The site is on the Environmental Protection Agency's National Priorities List (NPL). This site was mined for sulphur beginning in 1865, and later for mercury. The most extensive surface mining occurred between 1922-1947 and 1955-1957; during these two periods mining waste containing mercury was dumped directly into Clearlake and along the shoreline. The Clearlake surface waters are an important area resource for recreational purposes such as fishing and boating. The human exposure pathway of greatest concern is the consumption of contaminated fish. The state has issued a health advisory regarding consumption of fish from Clearlake. Potential on-site exposure routes include ingestion, inhalation, and dermal contact with contaminated soil and surface water. Potential off-site exposure routes include ingestion and dermal contact with surface water and groundwater; most of the mercury in the lake is contained in bottom sediment and along the shore of Oaks Arm. Based on available information reviewed, the Agency for Toxic Substances and Disease Registry has concluded that this site is a public health hazard.