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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
Filter Total Items: 6158
The groundwater geochemistry of waste disposal facilities The groundwater geochemistry of waste disposal facilities
No abstract available.
Authors
P.L. Bjerg, H.-J. Albrechtsen, P. Kjeldsen, T. Christensen, Isabelle M. Cozzarelli
Mass balance approach to interpreting weathering reactions in watershed systems Mass balance approach to interpreting weathering reactions in watershed systems
No abstract available.
Authors
O.P. Bricker, Blair F. Jones, C.J. Bowser
Occurrence of arsenic in ground water of the Middle Rio Grande Basin, central New Mexico Occurrence of arsenic in ground water of the Middle Rio Grande Basin, central New Mexico
Chemical data from more than 400 ground-water sites in the Middle Rio Grande Basin of central New Mexico indicate that arsenic concentrations exceed the U.S. Environmental Protection Agency drinking-water standard of 10 micrograms per liter across broad areas of the Santa Fe Group aquifer system, which is currently the almost exclusive source of drinking-water supply for residents of the...
Authors
L.N. Plummer
How fast does water flow in an unsaturated macropore? Evidence from field and lab experiments How fast does water flow in an unsaturated macropore? Evidence from field and lab experiments
A wide range of available field and lab evidence can lead to useful generalizations about the speed of macropore flow, which often dominates the transport of water and contaminants. In 36 published field tests, the values of maximum transport speed in macropores and other preferential channels vary surprisingly little. The available tests vary widely in type of medium, including...
Authors
John R. Nimmo
Microbial degradation of atmospheric halocarbons Microbial degradation of atmospheric halocarbons
Halocarbons are present in the atmosphere at parts-per-trillion (ppt) mixing ratios and are represented by such substances as chlorofluorocarbons (CFCs), hydrochlolofluorocarbons (HCFCs), hydrofluorocarbons (HFCs), and methyl halides like methyl bromide (MeBr) and their further substituted halomethane analogues (e. g., dibromomethane, bromoform). Many Halocarbons have only an...
Authors
Ronald S. Oremland
Volatile fuel hydrocarbons and MTBE in the environment Volatile fuel hydrocarbons and MTBE in the environment
No abstract available.
Authors
Isabelle M. Cozzarelli, A. L. Baehr
LC/MS analyses of cationic surfactants: Methods and applications LC/MS analyses of cationic surfactants: Methods and applications
No abstract available.
Authors
I. Ferrer, H.F. Schroeder, Edward T. Furlong
Pliocene to Holocene Lakes in the Western Great Basin, USA: New perspectives on paleoclimate, landscape dynamics, tectonics, and paleodistribution of aquatic species Pliocene to Holocene Lakes in the Western Great Basin, USA: New perspectives on paleoclimate, landscape dynamics, tectonics, and paleodistribution of aquatic species
No abstract available.
Authors
Marith C. Reheis, Joanna L. Redwine, K. Adams, S. Stine, K. Parker, R. Negrini, R. M. Burke, G. Kurth, John McGeehin, James B. Paces, F. Phillips, Andrei M. Sarna-Wojcicki, J. Smoot
Geochemistry of active and passive treatment processes used to treat mine drainage Geochemistry of active and passive treatment processes used to treat mine drainage
No abstract available.
Authors
Katherine Walton-Day
Geothermal arsenic Geothermal arsenic
No abstract available.
Authors
John G. Webster, D. Kirk Nordstrom
Tracers in groundwater: Use of microorganisms and microspheres Tracers in groundwater: Use of microorganisms and microspheres
No abstract available.
Authors
Ronald W. Harvey, Hauke Harms
Geochemical processes controlling transport of arsenic in groundwater: A review of adsorption Geochemical processes controlling transport of arsenic in groundwater: A review of adsorption
Adsorption is the predominate mechanism controlling transport of arsenic in many ground water systems. Hydrous oxides of iron, aluminum, and manganese, and clay minerals are commonly associated with aquifer solids and have been shown to be significant adsorbents of arsenic. The extent of arsenic adsorption is influenced by the chemistry of the aqueous phase including pH, arsenic...
Authors
Kenneth G. Stollenwerk