CONTENTS
- Abstract
- Introduction
- Background
- Purpose and Scope
- Previous Investigations
- Acknowledgments
- Description of Study Area
- Location and Climate
- Hydrologic Setting
- Contaminant Criteria
- Study Approach and Methods
- Results
- Field Blanks
- Humboldt River and Drains
- Surface Water
- Streamflow
- Specific Conductance
- pH and Temperature
- Dissolved Oxygen
- Sodium
- Chloride
- Dissolved solids
- Nutrients
- Nitrogen
- Ammonia
- Total Phosphorus
- Trace Elements
- Arsenic
- Boron
- Mercury
- Molybdenum
- Selenium
- Uranium
- Hydrogen and Oxygen Isotopes
- Constituent Loading
- Bottom Sediment
- Arsenic
- Cadmium
- Chromium
- Copper
- Mercury
- Nickel
- Selenium
- Upper Humboldt Lake Wetland
- Surface Water
- Bottom Sediment
- Summary
- References Cited
- Appendix
- Compiled water quality data for U.S. Geological Survey samples from the lower Humboldt River
system, 1998-2000
- Compiled bottom-sediment quality data for U.S. Geological Survey samples from the lower Humboldt
River system, 1998-2000
ILLUSTRATIONS
1-3. Map showing:
- Location of the Humboldt River Basin
- Site locations in the Humboldt River Basin for collection of streamflow and surface-water and
bottom-sediment quality samples, 1998-2000
- Site locations in the lower Humboldt River Basin downstream from Lovelock for the collection of
streamflow and surface-water and bottom-sediment quality samples
- Schematic diagram showing the flow system, stream-gaging stations, and various water uses within
the study area
5-7. Graphs showing:
- Median monthly discharge in Army Drain during "pump-on" and "pump-off" periods, June 1999-
September 2000
- Estimated median monthly discharge values for the unnamed drain, June 1999-September 2000
- Estimated monthly volumes in Army Drain and the contribution from the unnamed drain, June 1999-
September 2000
8-14. Graphs showing concentrations in surface water samples collected from the lower Humboldt River,
selected drains, and Upper Humboldt Lake; May 1998-July 2000:
- Sodium
- Chloride
- Dissolved solids
- Arsenic
- Boron
- Molybdenum
- Selenium
- Graph showing stable isotopes of hydrogen and oxygen in surface-water samples collected from the
lower Humboldt River, selected drains, and Upper Humboldt Lake; May 1998 through July 2000
- Graph showing estimated cumulative permitted mine-dewatering discharges to the surface waters of the
Humboldt River and tributaries from June 1998 through September 1999
17-23. Graphs showing concentrations in sediment samples collected from the lower Humboldt River, selected
drains, and Upper Humboldt Lake; August 1998, August 1999, and April and July 2000:
- Arsenic
- Cadmium
- Chromium
- Copper
- Mercury
- Nickel
- Selenium
TABLES
- Selected sites for the collection of water and bottom-sediment samples in the lower Humboldt River Basin,
1998-2000
- Drainage areas and long-term annual mean discharge, for selected U.S. Geological Survey gaging stations,
Humboldt River Basin
- Selected effect concentrations and U.S. Environmental Protection Agency and Nevada Division of
Environmental Protection water-quality criteria for inorganic substances
- Summary of Canadian Interim Freshwater Sediment-Quality Guidelines for the protection of aquatic life
(Canadian Council of Ministers of the Environment, 1999), Department of the Interior (1998) and
consensus-based sediment-effect concentrations
- National Water Quality Laboratory and field reporting limits for constituents in water and bottom-
sediment samples collected in 1998 through 2000
- Constituent concentrations in field blanks during water sampling of the Humboldt River and selected
drains, June 1998 through September 1999
- Minimum, median, and maximum discharge in the lower Humboldt River and selected drains, June 1998
through September 1999
- Minimum, median, and maximum specific conductance values in samples collected from the lower
Humboldt River and selected drains, June 1998 through September 1999
9-17. Minimum, median, and maximum concentrations in samples collected from lower Humboldt River and
selected drain waters, June 1998 through September 1999:
- Dissolved oxygen
- Sodium
- Chloride
- Dissolved solids
- Total nitrogen
- Un-ionized ammonia
- Total phosphorus
- Arsenic
- Boron
- Total- and methyl-mercury concentrations in samples collected from the lower Humboldt River and
selected drains, August 1999
19-21. Minimum, median, and maximum concentration in samples collected from the lower Humboldt River and
selected drains, June 1998 through September 1999:
- Molybdenum
- Selenium
- Uranium
- Minimum, maximum, and median instantaneous discharges and calculated instantaneous loads of selected
constituents at sampling sites along the lower Humboldt River and selected drains, June 1998 through
September 1999
- Summary of concentrations of selected constituents found in filtered surface waters collected from Upper
Humboldt Lake: May 1998, August 1999, and April and July 2000
- Summary of constituents in surface water collected during this study that exceeded ecological criteria in
the lower Humboldt River system
- Summary of constituents in sediments collected during this study at concentrations exceeding Canadian
Interim Freshwater Sediment-Quality Guidelines in the lower Humboldt River system
- Summary of constituents in sediments collected during this study at concentrations exceeding
probable-effect levels in the lower Humboldt River system
CONVERSION FACTORS, VERTICAL DATUM AND ABBREVIATED WATER QUALITY UNITS
|
Multiply |
|
By |
To obtain |
|
acre |
|
4,047 |
square meter (m2) |
acre-foot (acre-ft) |
|
1,233 |
cubic meter (m3) |
acre-foot per day (acre-ft/d) |
|
0.001233 |
cubic hectometer per day (hm3/d) |
acre-foot per month (acre-ft/mo) |
|
0.001233 |
cubic hectometer per month (hm3/mo) |
acre-foot per year (acre-ft/yr) |
|
0.001233 |
cubic hectometer per year (hm3/yr) |
cubic foot per second (ft3/s) |
|
0.02832 |
cubic meter per second (m3/s) |
foot (ft) |
|
0.3048 |
meter |
inch (in.) |
|
25.4 |
millimeter |
mile (mi) |
|
1.609 |
kilometer |
square mile (mi2) |
|
2.590 |
square kilometer |
tons per day (tons/day) |
|
907.2 |
kilograms per day (kg/day) |
|
Temperature: Degrees Celsius (°C) can be converted to degrees Fahrenheit (°F) by using the formula °F = [1.8(°C)]+32. Degrees Fahrenheit can be converted to degrees Celsius by using the formula °C = 0.556(°F-32).
Sea level: In this report, "sea level" refers to the National Geodetic Vertical Datum of 1929 (NGVD of 1929, formerly called "Sea-Level Datum of 1929"), which is derived from a general adjustment of the first-order leveling networks of the United States and Canada.
Abbreviated Water Quality Units:
g |
(gram) |
mm |
(millimeter) |
g/min |
(gram per minute) |
mg/kg |
(milligram per kilogram) |
L |
(liter) |
mg/L |
(milligram per liter) |
µg/g |
(microgram per gram ng/g) |
ng/g |
(nanogram per gram) |
µg/L |
(microgram per liter) |
ng/L |
(nanogram per liter) |
µS/cm |
(microsiemens per centimeter at 25° C) |
pCi/L |
(picocurie per liter) |
|