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• 5nowmass Coal Company proposes additional mining under North Thompson <br /> Creek. This mining will consist of development entries. These areas <br />will be protected from subsidence by insuring that sufficient coal is <br />left in place to prevent subsidence. <br />Middle Thompson Creek <br />Middle Thompson Creek lies along the southern boundary of the No. 1 Mine <br />permit area. Middle Thompson Creek is a snow-melt stream. It is depen- <br />dent on the winter snow pack for much of its annual flow. Runoff from <br />storms also contributes to stream flow and accounts for peak flows dur- <br />ing the summer and fall months. A detailed description of the surface <br />hydrology is presented in the hydrology sections of this permit appllca- <br />tion (Sections 3.4.2.1 and 3.6.1.2). <br />Snowmass Coal Company proposes mining adJacent to Middle Thompson Creek. <br />The proposed mining consists of bleeder entries. These entries will be <br />designed to remain stable. These areas will be protected against subsi- <br />dence by insuring that sufficient coal is left to place to prevent sub- <br />sidence. <br />Sandstone Aquifers <br />The maJor aquifers 1n the permit and adJacent area are the Upper Send- <br />stone~ the Middle Sandstone and the Rollins Sandstone. A detailed des- <br />• cription of the ground water hydrology to the permit and adJacent area <br /> is presented to Section 3.6.1 of the permit application. <br />10 <br />