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Climatologic, soil-water, ground-water, geologic, surface-water, and water-quality data were collected at five sites at a surface coal mine in northwestern Colorado. The data were collected to help describe the hydrogeology and geochemistry of an area that is being surface mined for coal. The study area was at the Seneca II Coal Mine. The Lennox coal and the Wadge coal are the major seams being mined. Confined aquifers in bedrock and unconfined aquifers in reclaimed spoil are present in the area. Springs are present at the toe of the reclaimed spoil slope. Climatologic data were collected at two sites. Air temperature, relative humidity, solar radiation, windspeed, and wind duration were collected at one site. Precipitation was measured at three rain gages. Snow-course data were collected at three sites. Soil-water content and soil dry density were measured. Eighteen wells in the confined aquifer and seven in the unconfined aquifer were installed at the study area. Geophysical and geologic logs were recorded for selected cored boreholes. Water levels were measured at the wells. Porosity, grain density, and permeability of selected core were estimated. Mineral composition also was determined. Ground-water samples were collected for water-quality analysis. Spring discharge and water quality were measured for two springs. Water quantity and quality were measured for two lysimeters.

Climatologic, soil-water, ground-water, geologic, surface-water, and water-quality data for a surface coal mine in northwestern Colorado