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San Francisco Bay, California is considered a mercury-impaired watershed. Elevated concentrations of mercury are found in water and sediment as well as fish and estuarine birds. Sources of mercury to the watershed since 1845 include sediment-associated mercury from mercury mining, mercury losses from gold amalgamation activities in mines of the Sierra Nevada, aerial deposition of mercury from global and regional emissions to air, and the direct discharge of mercury to Bay waters associated with the urbanization and industrialization of the estuary. We assessed historical trends in mercury bioaccumulation by measuring mercury concentrations in feathers of the endangered California Ridgway’s rail (formerly California...
San Francisco Bay, California is considered a mercury-impaired watershed. Elevated concentrations of mercury are found in water and sediment as well as fish and estuarine birds. Sources of mercury to the watershed since 1845 include sediment-associated mercury from mercury mining, mercury losses from gold amalgamation activities in mines of the Sierra Nevada, aerial deposition of mercury from global and regional emissions to air, and the direct discharge of mercury to Bay waters associated with the urbanization and industrialization of the estuary. We assessed historical trends in mercury bioaccumulation by measuring mercury concentrations in feathers of the endangered California Ridgway’s rail (formerly California...
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Licensing database extracts from the FCC for AM; FM; antenna structure registrations; cellular towers; commercial, private, and broadcast land mobile towers; paging service towers; microwave towers; analog and digital television broadcast locations; and aggregate cell service call sign areas. Â These data were extracted from the FCC database on 06/14/2012 and clipped to the ARkStorm study area extent on 08/07/2013.
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Boundaries of historical and prescribed burns in the ARkStorm study area. Â GeoMAC Historical fire perimeters (2000-2012) for the ARkStorm study Area. Â CALFIRE prescribed burns in the ARkStorm study area (1900-2011).


    map background search result map search result map Historical Fire Perimeters in the ARkStorm Study Area FCC Licensing Database Extracts for the ARkStorm Study Area Extent Historical methyl mercury in San Francisco Bay Historical methyl mercury in San Francisco Bay Historical Fire Perimeters in the ARkStorm Study Area FCC Licensing Database Extracts for the ARkStorm Study Area Extent Historical methyl mercury in San Francisco Bay Historical methyl mercury in San Francisco Bay