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• was selected as the boundary of the basin. This stratigraphic base of <br />the general area is the contact of the Williams Fork and the Iles <br />Formations. <br />The Twentymile Park basin is of sufficient depth and areal extent to <br />include one or more watersheds containing perennial streams and ground <br />water systems, thereaby allowing assessment of the probable <br />cummulative impacts on the quantity and quality of surface and ground <br />water systems in the Twentymile Park Basin. <br />The general area, with respect to surface water, is approximately <br />coincident with the general area defined by the ground water basin and <br />includes two watersheds containing perennial streams: the watershed <br />of Fish Creek and the watershed of lower Trout Creek. The size of the <br />general area was carefully chosen to be large enough to provide an <br />adequate assessment of the impacts created by the mining activities <br />described in this permit application and small enough to eliminate <br />• "masking" or confounding effects <br />specifically, the Edna Mine on Tr <br />upstream of the confluence of Fish <br />area, adjacent area and proposed <br />surface water and ground water are <br />Park Hydrology. <br />from other existing mining areas, <br />w t Creek approximately seven miles <br />Creek and Trout Creek. The general <br />permit area with respect to both <br />all delineated on Map 3, Twentymile <br />(2) The use of approved modeling techniques may be included as part' <br />of the permit application, but the same surface and ground water <br />information may be required for each site as when models are not used. <br />RESPONSE: <br />All information required by Rule 2.04.5 (1)(b) for permit approval <br />accompanies this permit application. This information is presented <br />under Rues 2.04.b and 2.04.1. Detai]ed data and information have <br />been gathered, compiled and analyzed for all lands within the proposed <br />permit area, the adjacent area and the general area, The geologic and <br /> <br />2.04-12 <br />