Charles Schalk (Former Employee)
Science and Products
Filter Total Items: 23
Nutrients, organic compounds, and mercury in the Meduxnekeag River watershed, Maine, 2003
In 2003, the U.S. Geological Survey, in cooperation with the Houlton Band of Maliseet Indians, sampled streambed sediments and surface water of the Meduxnekeag River watershed in northeastern Maine under various hydrologic conditions for nutrients, hydrophobic organic compounds, and mercury. Nutrients were sampled to address concerns related to summer algal blooms, and organic compounds and mercur
Authors
Charles W. Schalk, Lan Tornes
Hydrogeology, ground-water use, and ground-water levels in the Mill Creek Valley near Evendale, Ohio
Withdrawals of ground water in the central Mill Creek Valley near Evendale, Ohio, caused water-level declines of more than 100 feet by the 1950s. Since the 1950s, management practices have changed to reduce the withdrawals of ground water, and recovery of water levels in long-term monitoring wells in the valley has been documented. Changing conditions such as these prompted a survey of water use,
Authors
Charles Schalk, Thomas Schumann
Descriptions of selected digital spatial data for former Air Force Plant 36, Evendale, Ohio
No abstract available.
Authors
Charles W. Schalk
Identification of potential wetlands in training areas on Ravenna Army Ammunition Plant, Ohio, and guidelines for their management
Potential wetlands in training areas on Ravenna Army Ammunition Plant, Ohio, were mapped by use of geographic information system (GIS) data layers and field inspection. The GIS data layers were compiled from existing sources and interpretation of aerial photography. Data layers used in the GIS analysis were wetland-plant communities, hydric soils, National Wetlands Inventory designated areas, and
Authors
C. W. Schalk, J.S. Tertuliani, R.A. Darner
Descriptions of selected digital spatial data for Ravenna Army Ammunition Plant, Ohio
Digital spatial data of Ravenna Army Ammunition Plant (RVAAP), in northeastern Ohio, were compiled or generated from existing maps for U.S. Army Industrial Operations Command. The data are in the Ohio north state-plane coordinate system (North American Datum of 1983) in an ARC/INFO geographic information system format. The data comprise 15 layers, which include boundaries, topography, and natural
Authors
C. W. Schalk, R.A. Darner
Analysis of the sensitivity of soils to the leaching of agricultural pesticides in Ohio
Pesticides have not been found frequently in the ground waters of Ohio even though large amounts of agricultural pesticides are applied to fields in Ohio every year. State regulators, including representatives from Ohio Environmental Protection Agency and Departments of Agriculture, Health, and Natural Resources, are striving to limit the presence of pesticides in ground water at a minimum. A prop
Authors
C. W. Schalk
Estimation of the recharge areas contributing water to the South Well Field, Columbus, Ohio
The city of Columbus, Ohio, operates four radial collector wells, designed to yield 42 Mgal/d (million gallons per day), in southern Franklin County, Ohio, as part of their municipal supply of water. The collector wells are adjacent to, and designed to induce infiltration from, Big Walnut Creek and Scioto River. A previously constructed, three-dimensional, steady-state and transient ground-water-f
Authors
C. W. Schalk
Results of the basewide monitoring program at Wright-Patterson Air Force Base, Ohio, 1993-1994
No abstract available.
Authors
C. W. Schalk, W. L. Cunningham
Evaluation of ground-water flow by particle tracking, Wright-Patterson Air Force Base, Ohio
The U.S. Geological Survey (USGS) and Wright-Patterson Air Force Base (WPAFB) began a Basewide Monitoring Program (BMP) in 1992. The purpose of the BMP was to establish a long-term ground-water and surface- water sampling network in order to (1) characterize current ground-water and surface-water quality; (2) describe water-quality changes as water enters, flows across, and exits Base boundaries;
Authors
W. L. Cunningham, R. A. Sheets, C. W. Schalk
Hydrogeology, simulated ground-water flow, and ground-water quality, Wright-Patterson Air Force Base, Ohio
Ground water is the primary source of water in the Wright-Patterson Air Force Base area. The aquifer consists of glacial sands and gravels that fill a buried bedrock-valley system. Consolidated rocks in the area consist of poorly permeable Ordovician shale of the Richmondian stage, in the upland areas, the Brassfield Limestone of Silurian age. The valleys are filled with glacial sediments of Wisco
Authors
D. H. Dumouchelle, C. W. Schalk, G.L. Rowe, J.T. De Roche
Ground-water levels and flow in the vicinity of Wright-Patterson Air Force Base, Ohio, October-December 1987
No abstract available.
Authors
Charles W. Schalk
Science and Products
Filter Total Items: 23
Nutrients, organic compounds, and mercury in the Meduxnekeag River watershed, Maine, 2003
In 2003, the U.S. Geological Survey, in cooperation with the Houlton Band of Maliseet Indians, sampled streambed sediments and surface water of the Meduxnekeag River watershed in northeastern Maine under various hydrologic conditions for nutrients, hydrophobic organic compounds, and mercury. Nutrients were sampled to address concerns related to summer algal blooms, and organic compounds and mercur
Authors
Charles W. Schalk, Lan Tornes
Hydrogeology, ground-water use, and ground-water levels in the Mill Creek Valley near Evendale, Ohio
Withdrawals of ground water in the central Mill Creek Valley near Evendale, Ohio, caused water-level declines of more than 100 feet by the 1950s. Since the 1950s, management practices have changed to reduce the withdrawals of ground water, and recovery of water levels in long-term monitoring wells in the valley has been documented. Changing conditions such as these prompted a survey of water use,
Authors
Charles Schalk, Thomas Schumann
Descriptions of selected digital spatial data for former Air Force Plant 36, Evendale, Ohio
No abstract available.
Authors
Charles W. Schalk
Identification of potential wetlands in training areas on Ravenna Army Ammunition Plant, Ohio, and guidelines for their management
Potential wetlands in training areas on Ravenna Army Ammunition Plant, Ohio, were mapped by use of geographic information system (GIS) data layers and field inspection. The GIS data layers were compiled from existing sources and interpretation of aerial photography. Data layers used in the GIS analysis were wetland-plant communities, hydric soils, National Wetlands Inventory designated areas, and
Authors
C. W. Schalk, J.S. Tertuliani, R.A. Darner
Descriptions of selected digital spatial data for Ravenna Army Ammunition Plant, Ohio
Digital spatial data of Ravenna Army Ammunition Plant (RVAAP), in northeastern Ohio, were compiled or generated from existing maps for U.S. Army Industrial Operations Command. The data are in the Ohio north state-plane coordinate system (North American Datum of 1983) in an ARC/INFO geographic information system format. The data comprise 15 layers, which include boundaries, topography, and natural
Authors
C. W. Schalk, R.A. Darner
Analysis of the sensitivity of soils to the leaching of agricultural pesticides in Ohio
Pesticides have not been found frequently in the ground waters of Ohio even though large amounts of agricultural pesticides are applied to fields in Ohio every year. State regulators, including representatives from Ohio Environmental Protection Agency and Departments of Agriculture, Health, and Natural Resources, are striving to limit the presence of pesticides in ground water at a minimum. A prop
Authors
C. W. Schalk
Estimation of the recharge areas contributing water to the South Well Field, Columbus, Ohio
The city of Columbus, Ohio, operates four radial collector wells, designed to yield 42 Mgal/d (million gallons per day), in southern Franklin County, Ohio, as part of their municipal supply of water. The collector wells are adjacent to, and designed to induce infiltration from, Big Walnut Creek and Scioto River. A previously constructed, three-dimensional, steady-state and transient ground-water-f
Authors
C. W. Schalk
Results of the basewide monitoring program at Wright-Patterson Air Force Base, Ohio, 1993-1994
No abstract available.
Authors
C. W. Schalk, W. L. Cunningham
Evaluation of ground-water flow by particle tracking, Wright-Patterson Air Force Base, Ohio
The U.S. Geological Survey (USGS) and Wright-Patterson Air Force Base (WPAFB) began a Basewide Monitoring Program (BMP) in 1992. The purpose of the BMP was to establish a long-term ground-water and surface- water sampling network in order to (1) characterize current ground-water and surface-water quality; (2) describe water-quality changes as water enters, flows across, and exits Base boundaries;
Authors
W. L. Cunningham, R. A. Sheets, C. W. Schalk
Hydrogeology, simulated ground-water flow, and ground-water quality, Wright-Patterson Air Force Base, Ohio
Ground water is the primary source of water in the Wright-Patterson Air Force Base area. The aquifer consists of glacial sands and gravels that fill a buried bedrock-valley system. Consolidated rocks in the area consist of poorly permeable Ordovician shale of the Richmondian stage, in the upland areas, the Brassfield Limestone of Silurian age. The valleys are filled with glacial sediments of Wisco
Authors
D. H. Dumouchelle, C. W. Schalk, G.L. Rowe, J.T. De Roche
Ground-water levels and flow in the vicinity of Wright-Patterson Air Force Base, Ohio, October-December 1987
No abstract available.
Authors
Charles W. Schalk