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} <br />• Renewable Resource Lands <br />Alluvial Valley Floor <br />The alluvial valley floors (AYFs) mapped in the permit end'ad~acent <br />areas are discussed in detail in Section 5.2.1 of this permit applica- <br />tion. Since the AVFs will not be undermined and are outside the area of <br />Influence from underground mining operations, they will be addressed in <br />no further detail in this subsidence section. <br />North Thompson Creek <br />North Thompson Creek lies along the northern boundary of the No. 1 Mine <br />• permit area and along the southern edge of the No. 3 Mine permit area. <br />North Thompson Creek is a snow-melt stream. It 1s dependent on the win- <br />ter snow pack for much of its annual flow. Runoff from storms also con- <br />tributes to stream flow and accounts for peak flow during the summer and <br />fall months. A detailed description of the surface hydrology 1n the <br />mine site area 1s presented in the hydrology sections of the permit ap- <br />plication (Sections 3.4.2.1 and 3.6.1.2). <br />North Thompson Creek 1s presently undermined by the main slopes and de- <br />velopment entries 1n the No. 1 Mine. The main slopes and development <br />entries provide access to the first longwall panel, Panel 1-1. Sufflcl- <br />ent coal has been left in place in these areas to prevent subsidence. <br /> <br />9 <br />