Geological and Geochemical Controls on the Chemical Evolution of Subsurface Water in Undisturbed and Surface-mined Landscapes in Western North Dakota.
Groenewold-GH; Koob-RD; McCarthy-G; Et Al
NTIS: PB/84-126952 :292 pages
Studies of several surface coal mining sites in western North Dakota resulted in the development of a hydrogeochemical model that accounts for the observed chemical characteristics of subsurface water in undisturbed settings. The near-surface several meters of the landscape is constantly subjected to alternate wetting-drying, a key mechanism in hydrogeochemical evolution. The purposes of this study were to refine the model, with particular emphasis on the sulfur cycle, and to determine the applicability of the model to postmining landscapes (spoils). It was concluded that the hydrogeochemical model is equally applicable to undisturbed and spoils landscapes and that the major species of concern in this region are sodium and sulfate.
CP; Final Contract Report;
NTIS Accession No.
North Dakota Geo. Survey