Model-calculated drawdown in layer 5 produced by pumping mine near tract C-a at 5 cubic feet per second.. 33. Model-calculated decrease in dissolved-solids concentrations in layer 2 produced by pumping mine near tract C-a at 5 cubic feet per second. ........ 3l+. Model-calculated change in di ssol ved-sol ids concentrations in layer 5 produced by pumping mine near tract C-a at 5 cubic feet per second. ........ 35-37. Graphs showing: 35. Change in model-calculated groundwater discharge and dissolved-solids concentrations in Yellow Creek valley produced by pumping mine near tract C-a at 5 cubic feet per second .

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The present report is the result of a 2-year investigation of the hydrology of Piceance Creek basin conducted by the U.S. Geological Survey in cooperation with the Colorado Department of Natural Resources. This project was one of four concurrent projects contracted in 1972 by the State of Colorado to investigate the possible effects of oil-shale development on the environment of the Piceance basin. Thome Ecological Institute was contracted to make an environmental inventory and impact study; Colorado State University was contracted to study revegetation and rehabilitation of disturbed land; and the Oil Shale Regional Planning Commission was contracted to study regional development and land-use planning. The combined results of these studies should provide the base data necessary to monitor and evaluate the environmental effects of future oil-shale development. To coordinate the activities of the four concurrent oil-shale studies, the Oil Shale Coordinating Committee was established. Within this framework, a Water Resources Steering Committee was formed to monitor the conduct and progress of the hydrologic investigations.

The present report is the result of a 2-year investigation of the hydrology of Piceance Creek basin conducted by the U.S. Geological Survey in cooperation with the Colorado Department of Natural Resources. This project was one of four concurrent projects contracted in 1972 by the State of Colorado to investigate the possible effects of oil-shale development on the environment of the Piceance basin. Thome Ecological Institute was contracted to make an environmental inventory and impact study; Colorado State University was contracted to study revegetation and rehabilitation of disturbed land; and the Oil Shale Regional Planning Commission was contracted to study regional development and land-use planning. The combined results of these studies should provide the base data necessary to monitor and evaluate the environmental effects of future oil-shale development. To coordinate the activities of the four concurrent oil-shale studies, the Oil Shale Coordinating Committee was established. Within this framework, a Water Resources Steering Committee was formed to monitor the conduct and progress of the hydrologic investigations.