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• hydrologic information included in this application was derived from <br />exploratory drilling; field investigations; geologic mapping; <br />monitoring and testing of numerous wells, piezometers and stream <br />gaging stations; and monitoring of climatological stations. <br />With respect to hydrology, modeling techniques were used to derive <br />specific baseline parameters of water quantity and quality, and in <br />determining the probable hydrologic consequences of surface mining <br />activities. Modeling techniques were adapted from the OSM handbook <br />publication, Coal Mining and Reclamation Operations, Part 1, the <br />Determination of the Probable Hydrologic Consequences, May 1980. The <br />specific modeling techniques that were used are explained in deatil <br />under 2.04.7 and 2.05.6(3). <br />(3) Permit applications may comply with the requirements of 2.04.5 <br />(1), 2.04.6(1)(a), 2.04.6(2)(a) and 2.04.7 by providing accurate <br />descriptive and predictive information relating to geology, water quality <br />• and quantity for the area to be affected over the estimated life of the <br />operation based upon extrapolation by an expert in the field from <br />documented data on the geology water quality and quantity of similar areas, <br />provided that the data used by the expert is included within the permit <br />application, the expert opinion is approved by the Division and all such <br />data are made available to the public for review and comment. <br />RESPONSE: <br />The descriptive and predictive information provided in this <br />application are based on site-specific data. No extrapolation of data <br />from other areas has been performed. The information provided has <br />been analyzed and interpreted by experts in the field. <br />Rule 2.04.6 - Geology Description <br />(1) Surface mining <br />r~ <br />2.04-13 <br />