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All mines on project land that are not already well caved or sealed by earth vill be sealed for safety. Although it is possible that these mines could develop acid drainge problems due to their inundation, it is not anticipated that such problems will be significantly adverse to the extent that corrective action is re'luired. It will only be a:!'ter flood storage and release that vater will seep from the mines, possibly carrying acid pollutants. Small mines and prospects should not cause any significant problems since they have short shafts which makes their contribution extremely small. Their workings are lower in elevation than their portals vhich forces water to drain out only through considerable earth material. This would most likely improve the chemical nature of the mine vater. The larger mines should be considered separately. The Williamston Brothers mine on the vest end of Mt, Carbon has a dDvnward inclined shaft, so drainage water will have to seep through considerable material on its way to a lover elevation. The Mt. Carbon mine on the right bank and the Wilson mine on the left bank present the only significant chance for mine water to seep into the valley. This seepage could be either through caved shafts and portals or through the coal seams themselves which intersect and underlie the valley at a near vertical attitude. However, little problem is anticipated from this seepage since the coal in this area is reportedly low in sulfur and the water seeping from the mines vill have to seep through earth material of some type. However, the possibility of acid mine water drainage cannot be entirely ignored. Therefore, any mine water drainage which occurs will be monitored during the life of the project. Any problem which arises will be corrected at that time. Although mines are knovn to exist in Bear Creek basin above the project area, water quality data that is available for lower Bear Creek does not indicate the presence of any current or past mining activity. Therefore, it is predicted that water 'luality in Bear Creek and the proposed lake will not be degraded because of future mining activity. 4. Water Quality - Several factors contributing to potential water 'luality problems in Bear Creek vould be removed upon project implementation. These include, but are not necessarily limited to, the package sevage treatment plant serving the trailer court in the proposed reservoir area, the two livestock pens on lower Turkey Creek, the cattle and horses that graze throughout what is to become the project area, and the numerous private homes and farmsteads in the area. Based on this and other factors discussed below, it is anticipated that total coliform bacteria in the impoundment will not exceed the 2400 per 100 milliliters limit set for water contact recreation bJ ~he State of Colorado. The impounded water in Bear Creek Lake vould also be sui table for non-contact recreation. Projected dissolved oxYgen levels, ?lus stocking and intensive management, would serve as a base for initiating a good cold-water fishery. 9