Containing arsenic-enriched groundwater tracing lead isotopic compositions of common arsenical pesticides in a coastal Maine watershed
Robert A. Ayuso, Nora K. Foley, Glipin R. Robinson Jr., A.S. Colvin, G. Lipfert, A.S. Reeve
2006, Conference Paper, Association for Environmental Health and Sciences - 21st Annual International Conference on Contaminated Soils, Sediments and Water
Arsenical pesticides and herbicides were extensively used on apple, blueberry, and potato crops in New England during the first half of the twentieth century. Lead arsenate was the most heavily used arsenical pesticide until it was officially banned. Lead arsenate, calcium arsenate, and sodium arsenate have similar Pb isotope compositions:...
Updated streamflow reconstructions for the Upper Colorado River Basin
Connie A. Woodhouse, Stephen T. Gray, David M. Meko
2006, Water Resources Research (42)
Updated proxy reconstructions of water year (October–September) streamflow for four key gauges in the Upper Colorado River Basin were generated using an expanded tree ring network and longer calibration records than in previous efforts. Reconstructed gauges include the Green River at Green River, Utah; Colorado near Cisco, Utah; San Juan...
Mass balance assessment for mercury in Lake Champlain
N. Gao, N.G. Armatas, J. B. Shanley, N.C. Kamman, E. K. Miller, G.J. Keeler, T. Scherbatskoy, T.M. Holsen, T. Young, L. McIlroy, S. Drake, Bill Olsen, C. Cady
2006, Environmental Science & Technology (40) 82-89
A mass balance model for mercury in Lake Champlain was developed in an effort to understand the sources, inventories, concentrations, and effects of mercury (Hg) contamination in the lake ecosystem. To construct the mass balance model, air, water, and sediment were sampled as a part of this project and other...
Geologic, hydrologic, and geochemical interpretations of mineral deposits as analogs for understanding transport of environmental contaminants
R. B. Wanty, B. R. Berger
2006, Journal of Geochemical Exploration (88) 162-165
Base- and precious-metal mineral deposits comprise anomalous concentrations of metals and associated elements, which may be useful subjects for study as analogs for migration of environmental contaminants. In the geologic past, hydrothermal mineral deposits formed at the intersection of favorable geologic, hydrologic and geochemical gradients. In the present, weathering of...
Seasonal growth and mortality of juveniles of Lampsilis fasciola (Bivalvia: Unionidae) released to a fish hatchery raceway
Shane D. Hanlon, Richard J. Neves
2006, American Malacological Bulletin (21) 45-49
Recent efforts to restore remnant or extirpated populations of freshwater mussels have focused on artificial propagation as an effective and practical conservation strategy. Although artificially cultured juveniles have been produced and released to the wild at various times of the year, no study has investigated the best time of year...
Mixing of shallow and deep groundwater as indicated by the chemistry and age of karstic springs
D. J. Toth, B. G. Katz
2006, Hydrogeology Journal (14) 827-847
Large karstic springs in east-central Florida, USA were studied using multi-tracer and geochemical modeling techniques to better understand groundwater flow paths and mixing of shallow and deep groundwater. Spring water types included Ca-HCO3 (six), Na-Cl (four), and mixed (one). The evolution of water chemistry for Ca-HCO3 spring waters was modeled...
Unravelling the structural control of mississippi valley-type deposits and prospects in carbonate sequences of the Western Canada Sedimentary Basin
D. Pana
2006, Bulletin of the Geological Survey of Canada 255-304
Re-examination of selected MVT outcrops and cores in the Interior Plains and Rocky Moun-tains of Alberta, corroborated with previous paragenetic, isotopic and structural data, suggests Laramide structural channelling of dolomitizing and mineralizing fluids into strained carbonate rocks. At Pine Point, extensional faults underlying the trends of MVT ore bodies and...
A cool eastern Pacific Ocean at the close of the Last Interglacial complex
D.R. Muhs, K. R. Simmons, G. L. Kennedy, K.R. Ludwig, L.T. Groves
2006, Conference Paper, Quaternary Science Reviews
New high-precision thermal ionization mass-spectrometric (TIMS) U-series ages of solitary corals (Balanophyllia elegans) from several marine terrace localities along the California and southern Oregon coasts date to the ???80,000 yr BP high stand of sea, correlative with marine isotope substage 5a, late in the last interglacial complex. Ages of multiple...
The role of sandstone in the development of an Ozark karst system, south-central Missouri
R. C. Orndorff, D. J. Weary, R.W. Harrison
2006, Special Paper of the Geological Society of America 31-38
Cave, spring, and sinkhole development in the Ozarks of south-central Missouri is placed in a geologic framework through detailed geologic mapping. Geologic mapping shows that initial dissolution and inception of cave development is concentrated just beneath sandstone beds within Upper Cambrian and Lower Ordovician dolostone. Although rocks of the Ozarks...
Estimating recharge rates with analytic element models and parameter estimation
W. R. Dripps, R. J. Hunt, Marilyn P. Anderson
2006, Ground Water (44) 47-55
Quantifying the spatial and temporal distribution of recharge is usually a prerequisite for effective ground water flow modeling. In this study, an analytic element (AE) code (GFLOW) was used with a nonlinear parameter estimation code (UCODE) to quantify the spatial and temporal distribution of recharge using measured base flows as...
Contamination of ground water by PCE - A national perspective
M.J. Moran, G.C. Delzer
2006, Conference Paper, Ground Water Management - Petroleum Hydrocarbons and Organic Chemicals in Ground Water: Prevention, Assessment, and Remediation Conf
Perchloroethylene (PCE) has physical and chemical properties that make it likely to persist in groundwater if released to the environment. The US Geological Survey has collected or compiled data on the occurrence of PCE in groundwater from major aquifers around the US. These data represent the occurrence of PCE in...
Low-temperature MTBE biodegradation in aquifer sediments with a history of low, seasonal ground water temperatures
P. M. Bradley, J. E. Landmeyer
2006, Ground Water Monitoring and Remediation (26) 101-105
Sediments from two shallow, methyl tert‐butyl ether (MTBE)–contaminated aquifers, with mean ground water temperatures ∼10°C, demonstrated significant mineralization of [U‐14C] MTBE to 14CO2 at incubation temperatures as low as 4°C. These results indicate that microbial degradation can continue to contribute to the attenuation of MTBE in ground water under...
Effects of heavy metals on the litter consumption by the earthworm Lumbricus rubellus in field soils
P.H.F. Hobbelen, J.E. Koolhaas, C.A.M. van Gestel
2006, Pedobiologia (50) 51-60
Aim of this study was to determine effects of heavy metals on litter consumption by the earthworm Lumbricus rubellus in National Park the "Brabantsche Biesbosch", the Netherlands. Adult L. rubellus were collected from 12 polluted and from one unpolluted field site. Earthworms collected at the unpolluted site were kept in...
Land-use effects on erosion, sediment yields, and reservoir sedimentation: A case study in the Lago Loiza Basin, Puerto Rico
Allen C. Gellis, Richard M. T. Webb, S. C. McIntyre, William J. Wolfe
2006, Physical Geography (27) 39-69
Lago Loíza impounded in 1953 to supply San Juan, Puerto Rico, with drinking water; by 1994, it had lost 47% of its capacity. To characterize sedimentation in Lago Loíza, a study combining land-use history, hillslope erosion rates, and subbasin sediment yields was conducted. Sedimentation rates during the early part of...
Geophysical evaluation of the Success Dam foundation, Porterville, California
L. E. Hunter, M.H. Powers, S. Haines, T. Asch, B.L. Burton, D.C. Serafini
2006, Conference Paper, Association of State Dam Safety Officials - Dam Safety 2006, Proceedings from the 2006 Annual Conference
Success Dam is a zonedearth fill embankment located near Porterville, CA. Studies of Success Dam by the recent Dam Safety Assurance Program (DSAP) have demonstrated the potential for seismic instability and large deformation of the dam due to relatively low levels of earthquake shaking. The U.S. Army Corps of Engineers...
Controls on soil pore water solutes: An approach for distinguishing between biogenic and lithogenic processes
A. F. White, M. S. Schulz, D.V. Vivit, A.E. Blum, David A. Stonestrom
2006, Journal of Geochemical Exploration (88) 363-366
Spatial and temporal variations in pore water compositions are characterized for a deep regolith profile developed on a marine terrace chronosequence near Santa Cruz California. Variations are resolved in terms of the dominance of either a lithogenic process, i.e. chemical weathering, or a biogenic process, i.e. plant nutrient cycling. The concept of elemental fractionation is introduced describing...
Presence and distribution of wastewater-derived pharmaceuticals in soil irrigated with reclaimed water
C.A. Kinney, E. T. Furlong, S.L. Werner, J.D. Cahill
2006, Environmental Toxicology and Chemistry (25) 317-326
Three sites in the Front Range of Colorado, USA, were monitored from May through September 2003 to assess the presence and distribution of pharmaceuticals in soil irrigated with reclaimed water derived from urban wastewater. Soil cores were collected monthly, and 19 pharmaceuticals, all of which were...
Resolving structural influences on water-retention properties of alluvial deposits
K.A. Winfield, J. R. Nimmo, J. A. Izbicki, P. M. Martin
2006, Vadose Zone Journal (5) 706-719
With the goal of improving property-transfer model (PTM) predictions of unsaturated hydraulic properties, we investigated the influence of sedimentary structure, defined as particle arrangement during deposition, on laboratory-measured water retention (water content vs. potential [θ(ψ)]) of 10 undisturbed core samples from alluvial deposits in the western Mojave Desert, California. The...
Effect of reduced winter precipitation and increased temperature on watershed solute flux, 1988-2002, Northern Michigan
R. Stottlemyer, D. Toczydlowski
2006, Biogeochemistry (77) 409-440
Since 1987 we have studied weekly change in winter (December-April) precipitation, snowpack, snowmelt, soil water, and stream water solute flux in a small (176-ha) Northern Michigan watershed vegetated by 65-85 year-old northern hardwoods. Our primary study objective was to quantify the effect of change in winter temperature and precipitation on...
Accumulation of contaminants in fish from wastewater treatment wetlands
L. B. Barber, S.H. Keefe, Ronald C. Antweiler, Howard E. Taylor, R.D. Wass
2006, Environmental Science & Technology (40) 603-611
Increasing demands on water resources in arid environments make reclamation and reuse of municipal wastewater an important component of the water budget. Treatment wetlands can be an integral part of the water-reuse cycle providing both water-quality enhancement and habitat functions. When used for habitat, the bioaccumulation potential...
Groundwater-surface water interaction in the riparian zone of an incised channel, Walnut Creek, Iowa
K. E. Schilling, Z. Li, Y.-K. Zhang
2006, Journal of Hydrology (327) 140-150
Riparian zones of many incised channels in agricultural regions are cropped to the channel edge leaving them unvegetated for large portions of the year. In this study we evaluated surface and groundwater interaction in the riparian zone of an incised stream during a spring high flow period using detailed stream...
Annual sediment flux estimates in a tidal strait using surrogate measurements
N. K. Ganju, D. H. Schoellhamer
2006, Estuarine, Coastal and Shelf Science (69) 165-178
Annual suspended-sediment flux estimates through Carquinez Strait (the seaward boundary of Suisun Bay, California) are provided based on surrogate measurements for advective, dispersive, and Stokes drift flux. The surrogates are landward watershed discharge, suspended-sediment concentration at one location in the Strait, and the longitudinal salinity gradient. The first two surrogates...
Application of environmental tracers to mixing, evolution, and nitrate contamination of ground water in Jeju Island, Korea
D.-C. Koh, Niel Plummer, Solomon D. Kip, E. Busenberg, Y.-J. Kim, H.-W. Chang
2006, Journal of Hydrology (327) 258-275
Tritium/helium-3 (3H/3He) and chlorofluorocarbons (CFCs) were investigated as environmental tracers in ground water from Jeju Island (Republic of Korea), a basaltic volcanic island. Ground-water mixing was evaluated by comparing 3H and CFC-12 concentrations with lumped-parameter dispersion models, which distinguished old water recharged before the 1950s...
Flow and form in rehabilitation of large-river ecosystems: an example from the Lower Missouri River
R. B. Jacobson, D.L. Galat
2006, Geomorphology (77) 249-269
On large, intensively engineered rivers like the Lower Missouri, the template of the physical habitat is determined by the nearly independent interaction of channel form and flow regime. We evaluated the interaction between flow and form by modeling four combinations of modern and historical channel form and modern and historical...
Gas-water-rock interactions in Frio Formation following CO2 injection: Implications for the storage of greenhouse gases in sedimentary basins
Yousif K. Kharaka, David R. Cole, Susan D. Hovorka, W.D. Gunter, Kevin G. Knauss, Barry M. Freifeild
2006, Geology (34) 577-580
To investigate the potential for the geologic storage of CO2 in saline sedimentary aquifers, 1600 t of CO2 were injected at 1500 m depth into a 24-m-thick sandstone section of the Frio Formation, a regional brine and oil reservoir in the U.S. Gulf Coast....
