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• 1.2 Scope and Purpose <br />The primary study objective was to develop and apply a computer- <br />based model to evaluate ground-water, surface-water interactions <br />and selected water-quality characteristics under ambient baseline <br />(calibration) and mine-impacted (prediction) conditions in the <br />Twentymile Park area of Routt County, Colorado. As part of this <br />study, we have used available data and reports available in the <br />public domain and provided by Twentymile Coal Company (TCC). <br />These have included a review of existing published and unpublished <br />reports, data and information available from the U.S., Geological <br />Survey (USGS), Colorado Mined Land Reclamation Division (CMLRD), <br />TCC and corporate affiliates, other state and federal agencies and <br />our own files related to this part of the Yampa River basin. <br />Information in numerous reports indicated in the reference list <br />(Section 6.0) were considered into the study design and execution. <br />Due to the more current and quite areally extensive data base made <br />• available for this study, the resultant model development and <br />analyses represent an enhancement of previous modeling efforts in <br />the Trout Creek basin. <br />2.0 APPROACH <br />2.1 Data Sources and Period of Record <br />In general, data inputs to this modeling-analysis study were <br />obtained from the following Sources: <br />(1) Twentymile Coal Company (TCC)--in-house data on stream- <br />flows and water quality and available data on water <br />rights and the irrigated lands. <br />(2) U.S. Geological Survey (USGS)--published data on stream- <br />flows and water quality. <br />r ~ <br />~J <br />-2- <br />