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Page 4890, results 122226 - 122250

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Publication Extents

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Determination of pentachlorophenol in water and aquifer sediments by high-performance liquid chromatography
D.F. Goerlitz
1981, Open-File Report 82-124
Methods for the determination of pentachlorophenol (PCP) in water and aquifer sediments are presented. Reverse-phase high-performance liquid chromotography employing ion suppression and gradient elution is used. PCP can be determined directly in water at a lower limit of detection Of 0.2 micrograms per liter. For extracts of sediment, PCP can...
Time-of-travel studies for the Little Androscoggin River, Maine
William J. Nichols, Barry M. Reed, Fred W. Greenlaw
1981, Open-File Report 81-640
Time-of-travel studies were conducted at flow durations of 20, 80, and 95 percent on the Little Androscoggin River from South Paris to Auburn, Maine. The river is about 29.3 miles long, and drains an area of about 354 square miles at its mouth.Traveltimes were determined by tracing the movement of...
Petrogenetic modeling of a potential uranium source rock, Granite Mountains, Wyoming
J. S. Stuckless, A.T. Miesch
1981, Professional Paper 1225
Previous studies of the granite of Lankin Dome have led to the conclusion that this granite was a source for the sandstone-type uranium deposits in the basins that surround the Granite Mountains, Wyo. Q-mode factor analysis of 29 samples of this granite shows that five bulk compositions are required to...
The Nature and Use of Copper Reserve and Resource Data
Dennis P. Cox, Nancy A. Wright, George J. Coakley
1981, Professional Paper 907-F
Copper reserve, resource, and production data can be combined to produce disaggregated resource estimates and trends and, when combined with demand forecasts, can be used to predict future exploration and development requirements. Reserve estimates are subject to uncertainties due mainly to incomplete exploration and rapidly changing economic conditions. United States' reserve...
Effects of residential wastewater treatment systems on ground-water quality in west-central Jefferson County, Colorado
Dennis C. Hall, D. E. Hillier, Edward Nickum, W.G. Dorrance
1981, Open-File Report 81-73
The use of residential wastewater-treatment systems in Evergreen Meadows, Marshdale, and Herzman Mesa, Colo., has degraded ground-water quality to some extent in each community. Age of community; average lot size; slope of land surface; composition, permeability, and thickness of surficial material; density, size , and orientation of fractures; maintenance of...
Complete Bouguer map of the Medicine Lake quadrangle, California
Carol A. Finn
1981, Open-File Report 81-98
A mathematical technique, called kriging, was programmed for a computer to interpolate hydrologic data based on a network of measured values in west-central Kansas. The computer program generated estimated values at the center of each 1-mile section in the Western Kansas Groundwater Management District No. 1 and facilitated contouring of...
Birds of the St. Croix River valley: Minnesota and Wisconsin
Craig A. Faanes
1981, North American Fauna 73
The St. Croix River Valley encompasses nearly 11,550 km2 in east-central Minnesota and northwestern Wisconsin. A wide range of habitats are available for birds including upland oak, lowland deciduous, maple-basswood, lowland and upland coniferous forests, natural basin wetlands, and grasslands. Situated in the north-central region of the United States, the...
Bedded Precambrian iron deposits of the Tobacco Root Mountains, southwestern Montana
H. L. James
1981, Professional Paper 1187
Bedded deposits of iron-formation are minor components of the thoroughly metamorphosed and deformed Precambrian rocks that make up the core of the Tobacco Root Mountains. The rocks are Archean in age; they predate a major Precambrian orogeny that affected all of southwestern Montana about 2,750 m.y. ago. The principal bed...