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Page 4067, results 101651 - 101675

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Thickness of the Mississippi River Valley confining unit, eastern Arkansas
Gerard Gonthier, Gary L. Mahon
1993, Water-Resources Investigations Report 92-4121
Concern arose in the late 1980s over the vulnerability of the Mississippi Valley alluvial aquifer to contamination from potential surface sources related to pesticide or fertilizer use, industrial activity, landfills, or livestock operations. In 1990 a study was begun to locate areas in Arkansas where the groundwater flow system is...
Quality assurance plan for the collection and processing of sediment data by the U.S. Geological Survey, Water Resources Division
J. M. Knott, G.D. Glysson, B.A. Malo, L.J. Schroeder
1993, Open-File Report 92-499
The U.S. Geological Survey sediment data quality assurance plan identifies and explains required quality assurance and suggested quality control practices. The approach is to subdivide the process for obtaining sediment data into 3 parts: (1) field, (2) office, and (3) laboratory operations. The report also summarizes recommended goals for each...
Stratigraphy of the late Proterozoic Murdama Group, Saudi Arabia
Robert C. Greene
1993, Bulletin 1976
The Murdama group is in the upper part of the sequence of Proterozoic layered rocks in the Precambrian shield of Saudi Arabia. It consists of clastic sedimentary rocks and small amounts of limestone and volcanic rocks. The Murdama crops out in the eastern part of the exposed part of the...
Methods for collecting algal samples as part of the National Water-Quality Assessment Program
Stephen D. Porter, Thomas F. Cuffney, Martin E. Gurtz, Michael R. Meador
1993, Open-File Report 93-409
Benthic algae (periphyton) and phytoplankton communities are characterized in the U.S. Geological Survey's National Water-Quality Assessment Program as part of an integrated physical, chemical, and biological assessment of the Nation's water quality. This multidisciplinary approach provides multiple lines of evidence for evaluating water-quality status and trends, and for refining an...
Escherichia coli and fecal-coliform bacteria as indicators of recreational water quality
D.S. Francy, Donna N. Myers, K.D. Metzker
1993, Water-Resources Investigations Report 93-4083
In 1986, the U.S. Environmental Protection Agency (USEPA) recommended that Escherichia coli (E. coli) be used in place of fecal-coliform bacteria in State recreational water-quality standards as an indicator of fecal contamination. This announcement followed an epidemiological study in which E. coli concentration was shown to be a better predictor...
Water quality of the Upper West Branch Susquehanna River and tributary streams between Curwensville and Renovo, Pennsylvania, May and July 1984
R.A. Hainly, J. L. Barker
1993, Water-Resources Investigations Report 90-4011
The soils and rocks of the Upper West Branch Susquehanna River basin, from its headwaters downstream for 150 miles, are laden with pyritic materials that have the potential to produce acid mine drainage. The effects of mine drainage are severe, particularly in the reach between Curwensville and Renovo where present...