Geochemistry of mercury and other constituents in subsurface sediment—Analyses from 2011 and 2012 coring campaigns, Cache Creek Settling Basin, Yolo County, California
Links
- Document: Report (56.3 MB pdf)
- Download citation as: RIS | Dublin Core
Abstract
Cache Creek Settling Basin was constructed in 1937 to trap sediment from Cache Creek before delivery to the Yolo Bypass, a flood conveyance for the Sacramento River system that is tributary to the Sacramento–San Joaquin Delta. Sediment management options being considered by stakeholders in the Cache Creek Settling Basin include sediment excavation; however, that could expose sediments containing elevated mercury concentrations from historical mercury mining in the watershed. In cooperation with the California Department of Water Resources, the U.S. Geological Survey undertook sediment coring campaigns in 2011–12 (1) to describe lateral and vertical distributions of mercury concentrations in deposits of sediment in the Cache Creek Settling Basin and (2) to improve constraint of estimates of the rate of sediment deposition in the basin.
Sediment cores were collected in the Cache Creek Settling Basin, Yolo County, California, during October 2011 at 10 locations and during August 2012 at 5 other locations. Total core depths ranged from approximately 4.6 to 13.7 meters (15 to 45 feet), with penetration to about 9.1 meters (30 feet) at most locations. Unsplit cores were logged for two geophysical parameters (gamma bulk density and magnetic susceptibility); then, selected cores were split lengthwise. One half of each core was then photographed and archived, and the other half was subsampled. Initial subsamples from the cores (20-centimeter composite samples from five predetermined depths in each profile) were analyzed for total mercury, methylmercury, total reduced sulfur, iron speciation, organic content (as the percentage of weight loss on ignition), and grain-size distribution. Detailed follow-up subsampling (3-centimeter intervals) was done at six locations along an east-west transect in the southern part of the Cache Creek Settling Basin and at one location in the northern part of the basin for analyses of total mercury; organic content; and cesium-137, which was used for dating. This report documents site characteristics; field and laboratory methods; and results of the analyses of each core section and subsample of these sediment cores, including associated quality-assurance and quality-control data.
Suggested Citation
Arias, M.R., Alpers, C.N., Marvin-DiPasquale, M.C., Fuller, C.C., Agee, J.L., Sneed, Michelle, Morita, A.Y., and Salas, A.J., 2017, Geochemistry of mercury and other constituents in subsurface sediment—Analyses from 2011 and 2012 coring campaigns, Cache Creek Settling Basin, Yolo County, California: U.S. Geological Survey Data Series 1061, 150 p., https://doi.org/10.3133/ds1061.
ISSN: 2327-638X (online)
Study Area
Table of Contents
- Acknowledgments
- Abstract
- Introduction
- The 2011 Deep Core Drilling Campaign
- The 2012 Deep Core Drilling Campaign
- Coring Methods and Equipment
- Calculation of Core Depths
- Determination of Land-Surface Elevations at Coring Locations
- Sediment-Core Processing
- Laboratory Analysis
- Coring Results
- Graphical Core Descriptions
- Laboratory Analysis Results
- Summary
- References
- Appendixes 1–2
Publication type | Report |
---|---|
Publication Subtype | USGS Numbered Series |
Title | Geochemistry of mercury and other constituents in subsurface sediment—Analyses from 2011 and 2012 coring campaigns, Cache Creek Settling Basin, Yolo County, California |
Series title | Data Series |
Series number | 1061 |
DOI | 10.3133/ds1061 |
Year Published | 2017 |
Language | English |
Publisher | U.S. Geological Survey |
Publisher location | Reston, VA |
Contributing office(s) | California Water Science Center |
Description | vi, 150 p. |
Country | United States |
State | California |
County | Yolo County |
Other Geospatial | Cache Creek Settling Basin |
Online Only (Y/N) | Y |
Google Analytic Metrics | Metrics page |