Method of analysis and quality-assurance practices for determination of pesticides in water by solid-phase extraction and capillary-column gas chromatography/mass spectrometry at the U.S. Geological Survey California District Organic Chemistry Laboratory, 1996-99
Kathryn L. Crepeau, Lucian M. Baker, Kathryn Kuivila
2000, Open-File Report 2000-229
A method of analysis and quality-assurance practices were developed to study the fate and transport of pesticides in the San Francisco Bay-Estuary by the U.S. Geological Survey. Water samples were filtered to remove suspended-particulate matter and pumped through C-8 solid-phase extraction cartridges to extract the pesticides. The cartridges were dried...
Probability models for estimation of number and costs of landslides
Robert A. Crovelli
2000, Open-File Report 2000-249
Preliminary method for anticipating the occurrence of precipitation-induced landslides in Seattle, Washington
Alan F. Chleborad
2000, Open-File Report 2000-469
Analysis of precipitation data associated with historical landslide events in Seattle has resulted in the identification of precipitation thresholds for the initiation of landslides. Also, an air-temperature index for multiple landslide events is identified, and in conjunction with the precipitation thresholds, is used to develop a method for anticipating the...
3-D spherical models of mantle convection with floating continents
V.P. Trubitsyn, V.V. Rykov
2000, Open-File Report 2000-218
Pesticides in surface water measured at select sites in the Sacramento River basin, California, 1996-1998
Joseph L. Domagalski
2000, Water-Resources Investigations Report 2000-4203
Pesticides were measured in one urban stream, one agricultural stream, one site on the Sacramento River, and one large flood control channel over a period of 18 months during 1996-1998. All sites were located within the Sacramento River Basin of California. Measurements were made on 83 pesticides or pesticide transformation...
Probability of detecting atrazine/desethyl-atrazine and elevated concentrations of nitrate plus nitrate as nitrogen in ground water in the Idaho part of the western Snake River Plain
Mary M. Donato
2000, Water-Resources Investigations Report 2000-4163
As ground water continues to provide an ever-growing proportion of Idaho?s drinking water, concerns about the quality of that resource are increasing. Pesticides (most commonly, atrazine/desethyl-atrazine, hereafter referred to as atrazine) and nitrite plus nitrate as nitrogen (hereafter referred to as nitrate) have been detected in many aquifers in the...
Measurement of ridge-spreading movements (Sackungen) at Bald Eagle Mountain, Lake County, Colorado, II: Continuation of the 1975-1989 measurements using a Global Positioning System in 1997 and 1999
David J. Varnes, J. A. Coe, J. W. Godt, W. Z. Savage, J. E. Savage
2000, Open-File Report 2000-205
Measurements of ridge-spreading movements at Bald Eagle Mountain in north-central Colorado were reported in USGS Open-File Report 90-543 for the years 1975-1989. Measurements were renewed in 1997 and 1999 using the Global Positioning System (GPS). Movements are generally away from a ridge-top graben and appear to be concentrated along 3...
Quality-assurance results for routine water analyses in U.S. Geological Survey laboratories, water year 1998
Amy S. Ludtke, Mark T. Woodworth, Philip S. Marsh
2000, Water-Resources Investigations Report 2000-4176
The U.S. Geological Survey operates a quality-assurance program based on the analyses of reference samples for two laboratories: the National Water Quality Laboratory and the Quality of Water Service Unit. Reference samples that contain selected inorganic, nutrient, and low-level constituents are prepared and submitted to the laboratory as disguised routine...
Concentrations of selected trace elements in fish tissue and streambed sediment in the Clark Fork-Pend Oreille and Spokane River basins, Washington, Idaho, and Montana, 1998
Terry R. Maret, K. D. Skinner
2000, Water-Resources Investigations Report 2000-4159
Fish tissue and bed sediment samples were collected from 16 stream sites in the Northern Rockies Intermontane Basins study area in 1998 as part of the U.S. Geological Survey National Water-Quality Assessment Program. Bed sediment samples were analyzed for 45 trace elements, and fish livers and sportfish fillets were analyzed...
Estimation and comparison of potential runoff-contributing areas in Kansas using topographic, soil, and land-use information
Kyle E. Juracek
2000, Water-Resources Investigations Report 2000-4177
Digital topographic, soil, and land-use information was used to estimate potential runoff-contributing areas in Kansas. The results were used to compare 91 selected subbasins representing slope, soil, land-use, and runoff variability across the State. Potential runoff-contributing areas were estimated collectively for the processes of infiltration-excess and saturation-excess overland flow using...
Seismic-hazard maps for Hawaii
Fred W. Klein, A.D. Frankel, C.S. Mueller, R. L. Wesson, P. G. Okubo
2000, IMAP 2724
Probabilistic seismic hazard maps were prepared for Hawaii portraying peak horizontal ground acceleration and horizontal spectral response acceleration for 0.2, 0.3, and 1.0 second periods with probabilities of exceedance of 10% in 50 years and 2% in 50 years. This particular data set...
Characterization and simulation of ground-water flow in the Kansas River Valley at Fort Riley, Kansas, 1990-98
Nathan C. Myers
2000, Water-Resources Investigations Report 2000-4096
Hydrologic data and a ground-water flow model were used to characterize ground-water flow in the Kansas River alluvial aquifer at Fort Riley in northeast Kansas. The ground-water flow model was developed as a tool to project ground-water flow and potential contaminant-transport paths in the alluvial aquifer on the basis of...
Nitrate source indicators in ground water of the Scimitar Subdivision, Peters Creek area, Anchorage, Alaska
Bronwen Wang, Pat M. Strelakos, Brett Jokela
2000, Water-Resources Investigations Report 2000-4137
A combination of aqueous chemistry, isotopic measurement, and in situ tracers were used to study the possible nitrate sources, the factors contributing to the spatial distribution of nitrate, and possible septic system influence in the ground water in the Scimitar Subdivision, Municipality of Anchorage, Alaska. Two water types were distinguished...
Altitude and configuration of the potentiometric surface in Warwick and East Nantmeal townships, Chester County, Pennsylvania, July through December 1998
Cynthia J. Rowland
2000, Open-File Report 99-458
No abstract available...
Potentiometric surface of the upper Floridan Aquifer, west-central Florida, May 2000
A. D. Duerr
2000, Open-File Report 2001-20
Bedrock geologic map of the Hubbard Brook experimental forest, Grafton County, New Hampshire
W.C. Burton, G. J. Walsh, T. R. Armstrong
2000, Open-File Report 2000-45-A
No abstract available....
Seafloor characterization offshore of the New York-New Jersey metropolitan area using sidescan-sonar
William C. Schwab, J. F. Denny, Bradford Butman, W. W. Danforth, D.S. Foster, B.A. Swift, L. L. Lotto, M. A. Allison, E.R. Thieler
2000, Open-File Report 2000-295
No abstract available....
Physical characteristics of stream subbasins in the Sauk River basin, central Minnesota
Christopher A. Sanocki, Brian C. Fischer
2000, Open-File Report 2000-233
Data that describe the physical characteristics of stream subbasins upstream from selected sites on streams in the Sauk River Basin, located in central Minnesota, are presented in this report. The physical characteristics are the drainage area of the subbasin, the percentage area of the subbasin covered only by lakes, the...
Evaluation of a Method of Estimating Low-Flow Frequencies from Base-Flow Measurements at Indiana Streams
John Thomas Wilson
2000, Water-Resources Investigations Report 2000–4063
A mathematical technique of estimating low-flow frequencies from base-flow measurements was evaluated by using data for streams in Indiana. Low-flow frequencies at low-flow partial-record stations were estimated by relating base-flow measurements to concurrent daily flows at nearby streamflow-gaging stations (index stations) for which low-flow- frequency curves had been developed. A...
Contaminants and drinking-water sources in 2001; recent findings of the U. S. Geological Survey
G. G. Patterson, M. J. Focazio
2000, Open-File Report 2000-510
As the Nation's principal earth-science agency, the U.S. Geological Survey (USGS) studies numerous issues related to contamination of drinking-water sources. The work includes monitoring to determine the spatial and temporal distribution of contaminants; research to determine sources, transport, transformations, and fate of contaminants, and assessments of vulnerability. Much of the...
Computer-model analysis of ground-water flow and simulated effects of contaminant remediation at Naval Weapons Industrial Reserve Plant, Dallas, Texas
Rene A. Barker, Christopher L. Braun
2000, Water-Resources Investigations Report 2000-4197
In June 1993, the Department of the Navy, Southern Division Naval Facilities Engineering Command (SOUTHDIV), began a Resource Conservation and Recovery Act (RCRA) Facility Investigation (RFI) of the Naval Weapons Industrial Reserve Plant (NWIRP) in north-central Texas. The RFI has found trichloroethene, dichloroethene, vinyl chloride, as well as chromium, lead,...
Measurement of hydraulic properties of the B-C interbed and their influence on contaminant transport in the unsaturated zone at the Idaho National Engineering and Environmental Laboratory, Idaho
K. S. Perkins, J. R. Nimmo
2000, Water-Resources Investigations Report 2000-4073
No abstract available....
Subsurface structure and seismic velocities as determined from high-resolution seismic imaging in the Victorville, California area: Implications for water resources and earthquake hazards
R. D. Catchings, B. F. Cox, M. R. Goldman, G. Gandhok, M. J. Rymer, J.R. Dingler, Peter Martin, A. Christensen, Elba Horta
2000, Open-File Report 2000-123
No abstract available....
Techniques for estimating magnitude and frequency of peak flows for Pennsylvania streams
Marla H. Stuckey, Lloyd A. Reed
2000, Water-Resources Investigations Report 2000-4189
Regression equations for estimating the magnitude and frequency of floods on ungaged streams in Pennsylvania with drainage areas less that 2,000 square miles were developed on the basis of peak-flow data collected at 313 streamflow-gaging stations. All streamflow-gaging stations used in the development of the equations had 10 or more...
Ground-water resources of Tinian, Commonwealth of the Northern Mariana Islands
Stephen B. Gingerich, Daniel S. Yeatts
2000, Water-Resources Investigations Report 2000-4068
Tinian, which lies in the western Pacific Ocean at latitude 15°N and longitude 145°W (fig. 1), is the second largest island (39.2 mi2) in the Commonwealth of the Northern Mariana Islands (CNMI). Fresh ground water is obtained from shallow wells that tap the surface of a freshwater lends found in...
