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H~ Coal Company <br />3333 Quebec St., Suite 8800 <br />' Denver, Colorado 80207 <br />Bishop Associates, Inc. have prepared this program that describes <br />engineering services to evaluate the potential of Alluvial Valley Floors (AVF) <br />in Hayden Gulch and Dry Creek, near your A~ mine. Our investigation will be <br />reconnaissance in nature, and we propose to use available data from the mine <br />application, public agencies, and unpublished data from W. R. Grace's files, <br />and other sources as much as possible. Information that will need to be <br />collected during the study will include site specific vegetation data, obser- <br />vations of geology and streamflow and actual water rights locations. These <br />data collected along with available data from existing sources will be analyzed <br />to determine if there are AVF's in Hayden Gulch and Dry Creek, and if so, what <br />are the relative impacts on the AVF's as a result of mining. <br />Our scope of work for this study is presented below: <br />A. SCOPE OF WORK <br />1. Bishop Associates will assimilate all available informa- <br />tion on the mine and surrounding areas, including data <br />from the mine permit application; analysis of both black <br />and white and infrared aerial photographs; soils informa- <br />• tion from published Soil Conservation Service maps of the <br />county; geologic and surface water data from the State and <br />the U. S. Geological Surveys; and ground water data from <br />the U. S. Geological Surveys, Water Resource Division. <br />These data will be analyzed to better determine the need <br />for additional data. <br />2. A site visit to both areas will be completed to identify <br />the presence or absence of: <br />- alluvial materials in the valleys; <br />- evidence of perrenial ground water systems; <br />- vegetation requiring permanent sources of water; <br />- irrigation structures or other evidence that water <br />has been placed on the lands; <br />- salt build up in the soils; <br />- perrenial surface water supplies. <br />3. During the site visit Bishop Associates will map alluvial <br />deposits in both valleys. The mapped alluvial deposits <br />will be checked with Soil Conservation Survey maps, and <br />• aerial photographs, and test hole data on file with W. R. <br />Grace s Co. The alluvial boundaries will be located on <br />base maps provided by W. R. Grace. <br />