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Mercury Assessment of the Merced River Ranch
The Merced River Ranch Mercury Assessment was undertaken as a component of the larger Merced River Corridor Restoration Plan ‐ Phase IV Project (CALFED ERP‐02‐P12‐D), which is intended to evaluate strategies for channel and floodplain restoration within the context of the contemporary flow regime. As part of the restoration design development for the Merced River Ranch (MRR), the study assessed the occurrence of mercury in gold dredger tailings above, within, and below the site along the Merced River. In accordance with the study plan (Stillwater Sciences 2004a),tailings, sediment, water and biota were sampled to better characterize the potential risks of mercury mobilization resulting from re‐use and removal of the tailings for floodplain and in‐channel restoration projects.
The goals of the study were to: determine the occurrence and distribution of mercury at the MRR; to determine the risk of mercury mobilization and uptake into the aquatic food web; and to assess the potential feasibility of processing the dredger tailings at the MRR by selectively removing mercury‐laden size fractions through dry sorting and washing.
mercury, assessment, restoration plan, dredger tailings, river sediment, water quality, bioindicator organisms, methylmercury, aquatic insect bioindicators, aquatic invertebrates, floodpplain, gravel augumentation
Stillwater Sciences. 2004. Mercury Assessment of the Merced River Ranch. Stillwater Sciences, Berkeley, California
September 30, 2004 10:00 PM
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Stillwater Sciences 2855 Telegraph Avenue, Suite 400 Berkeley, California 94705
Merced River Ranch, Highway 59,
Merced River, Lake McClure, Merced Falls Dam
Merced County