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INTRODUCTION <br />The Snowmass Coal Company has commissioned Gibbs & Hill, Inc., <br />to coordinate and focus the efforts of several consultants into <br />designing and engineering an environmentally acceptable coal-waste <br />impoundment system at the North Thompson Creek Mines in Pitkin <br />County, Colorado. This final report dwells on several geochemical <br />aspects of the proposed disposal and impoundment facility. <br />The purpose of this combined field and laboratory investi- <br />gation was to obtain and develop geochemical data to complement <br />hydrologic and geotechnical studies of the impoundment site, and <br />in so doing, to assist in the final design engineering of the <br />disposal and impoundment facility. Groundwater samples were <br />retrieved from the site and were analyzed to establish present <br />day baseline water quality. Samples of coal-waste were examined <br />in laboratory leaching tests in order to identify and quantify the <br />trace elements that are likely to be mobilized from the wasted <br />material. Finally, several samples of local soil and clay were <br />evaluated for their capacity to mitigate trace element away from <br />the impoundment area. <br /> <br />2 <br />