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4 <br />I. Introduction <br />The Department of Agricultural and Chemical Engineering, Colorado <br />State University, agreed by contract with the Adolph Coors Company of <br />I Golden, Colorado to make a preliminary study of the water resources in <br />the vicinity of a possible coal strip mine site located in sections 25, <br />26,,35 and 36 (approximately), T3N, R64W, Weld County, Colorado. <br />{ ~ The objective of this study was to evaluate the water resources at <br />the potential strip coal mine site relative to the following concerns: <br />a. quantity of existing water resources, <br />b. Quality of existing water resources, <br />c. Potential impacts of mining on quantity of water, <br />( d. Potential impacts of mining on quality of water. <br />• e. Quantity and quality of mine inflow. <br />To achieve this objective 2l wells were drilled in the study area <br />to provide a means for identifying aquifers, measuring piezometric sur- <br />face .elevations, measuring the transmissivity and storage coefficients <br />and collecting water samples from each aquifer. The report contains a <br />summary of the data collection procedures, analyses of the data and the <br />conclusions derived in the course of this investigation. <br />II. General Description of Hydrology and Geology <br />A. Climate <br />The climate of the study area is characterized by low relative <br />humidity, cold winters and modestly hot summers. The mean annual temper- __ <br />ature as recorded at Greeley and Fort Lupton is about 48°F. From 1952 <br />• to 1976 the average annual precipitation ranged from 12.08 inches at <br />Fort Lupton to 12.28 inches at Greeley. The maximum monthly precipitation <br />normally occurs during May; the minimum. normally occurs during January <br />