Publications
Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).
Filter Total Items: 3787
User's guide to revised method-of-characteristics solute-transport model (MOC--version 31)
The U.S. Geological Survey computer model to simulate two-dimensional solute transport and dispersion in ground water (Konikow and Bredehoeft, 1978; Goode and Konikow, 1989) has been modified to improve management of input and output data and to provide progressive run-time information. All opening and closing of files are now done automatically by the program. Names of input data files are entere
Authors
Leonard F. Konikow, G.E. Granato, G.Z. Hornberger
Concentrations of selected herbicides, two triazine netabolites, and nutrients in storm runoff from nine stream basins in the Midwestern United States, 1990-92
No abstract available.
Authors
Elisabeth A. Scribner, Donald A. Goolsby, E. Michael Thurman, Michael T. Meyer, Michael L. Pomes
San Francisco Bay/delta regional monitoring program plankton and water quality pilot study, 1993, in 1993 Annual Report, San Francisco Estuary Regional Monitoring Program for Trace Substances: San Francisco Estuary Institute
The pilot program described here is motivated by a fundamental principle of the Regional Monitoring Strategy, namely “...the development of data that will provide information on status and trends in the Estuary.” As pointed out in the Strategy, knowledge of status and trends serves two primary purposes: (1) to become aware of or anticipate deleterious conditions in the Estuary, and (2) to assess t
Authors
Alan D. Jassby, James E. Cloern, J. Caffrey, B. Cole, J. Rudek
Characterization of the hydrogeology and water quality at the Management Systems Evaluation Area near Princeton, Minnesota, 1991-92
The Management Systems Evaluation Area (MSEA) program is part of a multi-scale, inter-agency initiative to evaluate the effects of agricultural management systems on water quality in the midwest corn belt. The Minnesota MSEA project is one of five projects selected to represent the principal hydrogeologic settings and geographic diversity of prevailing management systems in the midwest corn belt.
Authors
G. N. Delin, M.K. Landon, J.A. Lamb, J. L. Anderson
Hydrology of, and water quality in, the open burning area and vicinity, Picatinny Arsenal, New Jersey, 1989-90
This report presents the results of a study to determine whether shallow ground water at Picatinny Arsenal Morris County, New Jersey, has been con- taminated as a result of operations at the open burning area, which is used for burning of waste explosives and materials contaminated with explosives. Results of previous investigations indicate that the soil in this area is contaminated with metals a
Authors
D. A. Storck
Contamination of shallow ground water in the area of building 95, Picatinny Arsenal, New Jersey, 1985-90
A zone of contaminated ground water at Picatinny Arsenal has resulted from the operation of a metal- plating facility in building 95 during 1960-81, and the wastewater-treatment system that is in and adjacent to the building. Thirty-two monitoring wells were installed in 1989 to supplement 12 previously installed wells. All wells were sampled in 1989 and 1990 for analysis of ground water for inorg
Authors
B. P. Sargent, D. A. Storck
Secondary minerals and acid mine-water chemistry
No abstract available.
Authors
Charles N. Alpers, D.W Blowes, D. Kirk Nordstrom, J.L. Jambor
Degradation of trifluoroacetate in oxic and anoxic sediments
THE deleterious effect of chlorofluorocarbons on stratospheric ozone has led to international cooperation to end their use. The search for acceptable alternatives has focused on hydrofluorocarbons (HFCs) or hydrochlorofluorocarbons (HCFCs) which are attractive because they have relatively short atmospheric residence times. HFCs and HCFCs are attacked by tropospheric hydroxyl radicals, leading to t
Authors
P.T. Visscher, C.W. Culbertson, R.S. Oremland
Specific yield as determined by type-curve analysis of aquifer-test data
The commonly used analytical solution developed by Neuman for a homogeneous, water-table aquifer assumes that the drainage of pores in the zone above the water table due to lowering of the water table occurs instantaneously. Noninstantaneous drainage of pores in the unsaturated zone accounts for the finding that both type-curve analysis and volume-balance calculations yield values of specific yiel
Authors
Allen F. Moench
Ionic strength and DOC determinations from various freshwater sources to the San Francisco Bay
An exact estimation of dissolved organic carbon (DOC) within the salinity gradient of zinc and copper metals is significant in understanding the limit to which DOC could influence metal speciation. A low-temperature persulfate/oxygen/ultraviolet wet oxidation procedure was utilized for analyzing DOC samples adapted for ionic strength from major freshwater sources of the northern and southern regio
Authors
Y.R. Hunter, J.S. Kuwabara
The feasibility of recharge rate determinations using the steady-state centrifuge method
The establishment of steady unsaturated flow in a centrifuge permits accurate measurement of small values of hydraulic conductivity (K). This method can provide a recharge determination if it is applied to an unsaturated core sample from a depth at which gravity alone drives the flow. A K value determined at the in situ water content indicates the long-term average recharge rate at a point. Tests
Authors
J. R. Nimmo, David A. Stonestrom, K.C. Akstin
Occurrence and distribution of organochlorine compounds in sediment and livers of striped bass (Morone saxatilis) from the San Francisco Bay-Delta Estuary
A preliminary assessment was made in 1992 of chlorinated organic compounds in sediments and in livers of striped bass from the San Francisco Bay-Delta Estuary. Samples of sediment and striped bass livers contained DDT (ethane, 1,1,1-trichloro-2,2-bis (p-chlorophenyl)-) and its degradation products, DDD (ethane, 1,1-dichloro-2,2-bis(p-chlorophenyl)-) and DDE (ethylene, 1,1-dichloro-2,2-bis (p-chlor
Authors
W. E. Pereira, F. D. Hostettler, J.R. Cashman, R. S. Nishioka