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slurry. Historically this slurry has been placed on designated pile sites to dry out. This area is the Mud <br />Drying Dump on Map C-2. Other dumps can also be seen on Map C-2, and contain some combination of <br />marble fines or marble blocks. The sediment sumps proposed in this plan will trap and contain all of the <br />water from a 10-year event on site. Each sump will provide sufficient detention time to ensure that <br />sediment drops out of the contained water within 48 hours due to the granular nature of the material at <br />the bottom of the sumps. CSQ's experience on site has been that most water contained within a sump <br />infiltrates into the underlying soil and rock. However, each sediment sump is designed with a water <br />discharge emergency spillway to allow for water to leave the sump once sediment has dropped out or to <br />allow discharge of waters up to the 100 year event. Although no discharges are expected for any event <br />up to 10 year frequency, any discharges will be regulated under a Colorado Department of Public Health <br />and Environment (CDPHE) discharge permit. <br />The mine roads have been used in the past to store fine waste from the marble cutting. All mine road <br />runoff will be collected by the ditches and sumps, as shown on Map C-2. The roads will be graded to the <br />inside ditches at a grade no milder than I%. <br />Yule Quarry April 10 18