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Probable Hydrologic Consequences Surface Water The Roadside and Cameo Hines are located in the Colorado River with the river dividing the permit area into east and vest pottions. Tributaries in the per- mit area are Colorado River, Coal, Jerry, Cottonwood, and Rapid Creeks and an unnamed drainage that crosses the northern portion of the permit area. Cot- tonwood Creek is intermittent during most years, but does floe continuously during vet years. Rapid Creek is perennial but as with Cottonwood Creek is also artificially controlled. In addition, reservoirs at the headwater of Cottonwood and Rapid Creeks, artificially increase the duration of floes and when eater is released. Coal Creek, Jerry Creek and the unnamed drainage are all ephemeral streams. Coal Creek is [he only stream to pass through the dis- turbed area near the Cameo Mine. The only other surface eater body vi thin ehe peffiit area is the O.S. Goverment Eiighline Canal. The canal carries Colorado River eater from the vest side of Debeque Capon, with syphons running under [he channels of Coal Creek and Jerry Creek. A11 surface runoff from disturbed areas will be routed through one of several sediment ponds. There are three collection ditches and four diversion ditches to control runoff. All waters discharged from their permit area will even- tually enter the Colorado River drainage. All pond and ditch designs were checked using Soil Conservation Service "Peak Flows" methods. All the ponds are designed to contain the runoff from a 10-year 24-hour runoff event and three years sediment accumulation, as determined by [be universal soil loss equation. The surface water monitoring plan includes monitoring sedimentation pond dis- charge points during discharge, mine devatering discharge points quarterly, points on the Colorado River above and below the mine site quarterly, and con- tinuous monitoring the of floe in Rapid Creek. Hine water discharge points will be sampled in accordance with the National Pollutant Discharge Elimina- tion System (NPDES). The company submitted information on the quantity of water is Rapid Creek be- low the confluence with Cottonwood Creek and will continue to monitor the flows below these confluences. The covered overland conveyor system, part of which crosses the river, sad a part of the disturbed area at the loadout facility are vi thin 100 feet of the Colorado River. The consequeoces of this are discussed later. During and after mining, the eater quantity and quality from the stream section within 100 feat of the surface coal mining operations will not be adversely af- fected. All runoff from the disturbed area will be treated in a sediment con- trol facility then released. ?ollocring complacion of mining, the disturbed areas will be reclaimed and eater quality and quac[ity should return to natu- ral conditions. The reclamation plan :rill call for reestablishment of rips= rian vegetation. The seeded mix for this area will be detemined following the collection of vegetation data. -5-