2007-07-30_GENERAL DOCUMENTS - C1981041

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i Canail used for dust suppression on surface roads. P Quantities ofwater consumed at the mine are reported annually in the Annual Hydrologic Report. Quantities consumed during active operations in water year 1992 were as follows: ~ Gallons Used Lo Nation Used Domestic Water 1,397,000 2,150,000 Mine Water 3,350,000 3,150,000 750,000 Highline Canal 1,170,000 Surface Facilities Preparation Plant Mining Preparation Plant Uni~erground Roads Surface Roads The operator has shown appropriate documentation of right for water consumption. Domestic water is supplied by Palisade Domestic Water. I Since cessation of mine and wash plant operations in 1999, water consumption has declined dramatically, and is now limited to surface dusi; suppression associated with reclamation operations (or loadout operations if the loadout is re-activated). All sediment ponds in the permit azea are designed to retain less than ten acre-feet of water;. The largest designed pond is Pond 6, with a maximum capacity of 3.95 acre-feet. This pond has a primary spillway with a gated valve which allows for dewatering of the pond as soon as the discharge can meet a Ffluent limits. Any water that may be detained in the sediment ponds is not put to any beneficial use. The sewage treatment lagoons are designed to treat 0.24 acre-feet withitp a two-week period. No water rights' are required for the sediment ponds or the sewage lagoons. Water depletion projections were updated to reflect current and anticipated future conditions in association with PR-3, in 2007. Annual depletion of 22.1 acre feet was projected, and is described in amended Tab 16, Section 2:0516(1) ofthe permit application. Surface Water Oualiri Possible hydrologic impacts on quality of surface water due to the Roadside and Cameo Mines include impacts to: Colorado River water due to mine water discharge, and 2. Runoff from surface disturbance. As discussed in Section ILA. ofthis document, the operator,previously submitted areport to thei Colorado Department of Health (CDOH) addressing the feasibility of treatment approaches to reduce salt contribution to the Colorado River. Based on review of the report? CDOH determined that no action was required df the operator to reduce salt contributions to the river and the operator has been exempted from specific numeric limitations or construction of new treatment facilities. Quarterly total dissolved solids monitoring is still required. Permit Revision No. 3 j Permit No. C-1981-041 July 30, 2007 i Page 30