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• 4.6.1 Hydroloey The surface and ground water hydrology are discussed in the following sections. Available surface and ground water information has been compiled and summarized by SMI in Appendix 1, Volume II of this document. A brief discussion of their report is included below along with a summary of information derived from monitoring and other site specific investigations. 4.6.1.1 Surface Water Locally, active surface water channels essentially do not exist throughout most of the diatreme-based District, and, therefore, do not exist in the areas proposed to be mined. Due to the high permeability of the diatreme and the lowering of the grotmd water table by the underground drainage tunnels, precipitation rapidly infiltrates and surface water flows are only rarely observed. • Those flows are not continuous in [he downstream direction, but may become more continuous after the granodiorite is encountered. Only during significant snowmelt or after heavy rainstorms is flow observed in the otherwise dry washes. The stream flow that does occur is seldom continuous along the channel. The flow usually infiltrates into the upper, and shallow, ground water system within the stream colluvial and alluvial sediments. Surface flow may appear again some distance downstream. Sections of the stream channel remain dry even during these precipitation events. Regionally, surface water flows from the Cresson Project azea are tributary to the Upper Arkansas River basin. On the north side, surface water would flow into Grassy Creek, a tributary to Beaver Creek. On the south side, surface water would flow into Theresa Gulch and Bateman Creek which are tributaries to Wilson Creek, which flows into Fourmile Creek. On the west side, surface water would flow into Poverty Gulch, Squaw Gulch, and Arequa Gulch, • all tributaries to Cripple Creek, which also flows into Fourmile Creek. Drawing 22