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APPENDIX 12 REVENUE MINE — MINE WATER HANDLING SYSTEM <br />A) Introduction <br />It is planned that the mine water historically emanating from the mine portal will be handled by first <br />channeling the water into a valve box near the portal, from which the water can go in any amount to a <br />combination of four pipes: <br />Pipes 1 and 2: These are 8" Diameter DR -11 HDPE pipes which will run at an approximate slope of 1% to <br />the east and west of the portal as shown on Map G -10. The pipes will have X" holes spaced every 6 <br />inches along the pipe, which will be buried a minimum of 2 feet from the surface. These pipes will allow <br />the mine water to enter existing waste rock in the mine surface area, where the water will enter the <br />groundwater and will not have a surface flow into Sneffels Creek. Groundwater is monitored and tested <br />from the 3 monitoring wells that are installed near Sneffels Creek, as shown on Maps C -2, C -3 and C-4. <br />Also, surface water is monitored in Sneffels Creek immediately upstream and downstream of the mine <br />permit area. <br />Pipes 3 and 4: These are 8" Diameter DR -8 HDPE pipe which have no perforations and will lead to a <br />leach field constructed specifically to remove zinc from the mine water. <br />The purpose of these pipes is to allow a greater amount of zinc to precipitate out from the mine water. <br />B) Leach Field Design <br />The leach field area may be lined with a 45 mil EPDM liner that is covered on both sides with Y -inch <br />thick felt fabric to prevent puncturing. This layering system may or may not be installed depending upon <br />need. If installed, this layering system will be placed on the sides of the area to a maximum slope of <br />1.51-I:1V and along the bottom of the leach field to contain the water within the leach field and prevent <br />infiltration of the mine water into the ground. The lined area will be approximately 31,360 square feet <br />in area. See the cross sections on Map G -10. <br />As shown on the middle illustration on Map G -10, the leach field consists of the main 8 "HDPE pipes <br />entering a valve box where the water can be directed to 2 perforated 8" diameter DR -11 HDPE pipes <br />which will be buried approximately 3 -5 feet. These delivery pipes will have Y" holes spaced every 6 <br />inches along the pipe, which will allow the mine water to percolate though waste rock that has been <br />1 <br />