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2. Water Information, Rights and Augmentation <br />Water used in the mine will come from underground sumps which collect water infiltration from cracks <br />in the marble and surrounding rock in the roof of the mine. This water is used for dust control and <br />marble cutting underground. Peak use of water is 30 gpm, which is primarily recycled into the <br />underground sumps. All of the water that leaves the mine comes out in the 50 mesh size mud from the <br />marble cutting or the drainage pipe extending from the south portal. This material is left to dry near the <br />South Portal as shown on Map C -2. Previously, the water from the dewatering was collected in a sump <br />and pumped to a 6" pipe located on the surface leading to Yule Creek, where the discharge was sampled <br />as part of the NPDES permit. This system was maintained for the post 2010 operation. As of 2013, all <br />mine water is recycled back into the mine and there is no mine water discharge from the site. As <br />described in the Sediment Control Plan, 10 sumps will provide water detention and each of these sumps <br />will be a new outfall in the revised NPDES permit. Therefore, there will be 10 total outfalls in this <br />permit. <br />Since all the water used in the operation has entered the mine from groundwater cracks, no surface water <br />consumptive use exists. All water placed with the cutting mud on the mud drying area is either <br />evaporated or recycled back in the mine. <br />3. Hydrologic Impacts and Sediment Control Plan <br />The marble mined at this quarry is basically calcium carbonate, which is a basic material, and will in no <br />way produce acid runoff. The marble could actually improve the quality of natural runoff. The biggest <br />potential negative impact from the operation is the disposal of fine material in the dump areas, which <br />could make their way down to the drainage below and result in higher suspended sediment loads in a <br />very clear stream (Yule Creek). <br />For this reason, the sediment control system has been completely redesigned for the 2010 Amendment to <br />address the fines issue and detention of runoff for all mine site disturbances. Since there is no room on <br />the site for a large sediment detention structure, the Yule Quarry mine area has been divided into ten <br />drainage basins that will each direct run -off towards a sump. The calculations for the total run -off in <br />Yule Quarry January 2014 23 <br />