USGS

Summary and Synthesis of Mercury Studies in the Cache Creek Watershed, California, 2000-01

By Joseph L. Domagalski, Darell G. Slotton, Charles N. Alpers, Thomas H. Suchanek, Ronald Churchill, Nicolas Bloom, Shaun M. Ayers, and John Clinkenbeard


U.S. GEOLOGICAL SURVEY

Water–Resources Investigations Report 03-4335
Sacramento, California 2004
Prepared in cooperation with the
California Bay-Delta Authority




Complete accessible text of report (1,895 KB PDF)
Front cover for report (1,242 KB PDF)

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This report summarizes the principal findings of the Cache Creek, California, components of a project funded by the CALFED Bay-Delta Program entitled "An Assessment of Ecological and Human Health Impacts of Mercury in the Bay-Delta Watershed." A companion report summarizes the key findings of other components of the project based in the San Francisco Bay and the Delta of the Sacramento and San Joaquin Rivers. These summary documents present the more important findings of the various studies in a format intended for a wide audience. For more in-depth, scientific presentation and discussion of the research, a series of detailed technical reports of the integrated mercury studies is available at the following website: < http://loer.tamug.tamu.edu/calfed/ >.


The overall study was a scientific cooperation and collaboration among several federal and state agencies and universities and one commercial laboratory. These agencies included the U.S. Geological survey (USGS), the U.S. Fish and Wildlife Service, the California Department of Fish and Game, the California Central Valley Regional Water Quality Control Board, the California Geological Survey, the University of California Davis, the San Jose State University Foundation, and Frontier Geosciences, Inc.

 

Contents

Introduction

Environmental Setting

Statement of the Problem

Mine-Site Studies

Mercury-Speciation Studies

Mercury-Loading Studies

Studies of Mercury Bioaccumulation Into and Through the Aquatic Food Chain in the Cache Creek Watershed

Relations Between Mercury in Fish and Mercury in Water

Links Between Water and Mercury Bioaccumulation

Links to Large-Fish Mercury

Conceptual Model of Mercury Cycling and Transport in the Cache Creek Watershed

Working Hypotheses

References Cited


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Water Resources of California



U.S. Department of the Interior, U.S. Geological Survey
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