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RULE 2 PERMITS <br /> <br />Rule 2 Permits 2.04-22 Revision Date: 4/9/25 <br /> Revision No.: MR-261 <br />available in the Annual Reclamation and Hydrology Reports submitted to the CDRMS for the <br />period 1983 through the present. <br /> <br />Permit Area <br /> <br />Surface water in the mine area is limited to Streeter Gulch, East Taylor Gulch, East Taylor Pond, <br />West Pit Pond, Warehouse Pond and sediment sump, Work Area Pond, three evaporative sewage <br />ponds, Section 16 Pond, Prospect Pond, West Taylor Pond, and Section 28 Pond. Three additional <br />detention ponds are located at the Loadout Area. All ponds, with the exception of the <br />warehouse/sewage pond complex, are sedimentation ponds and respond only to runoff related <br />events. The ponds are designed to treat the 10-year, 24-hour precipitation event, or fully contain <br />the 100-year, 24-hour precipitation event. Additionally, water flowing off of the reclaimed lands <br />is retained by contour furrows, revegetated slopes and a number of small depressions/stock ponds. <br />A number of permanent drainage channels and temporary drainage channels will also be <br />incorporated into the final reclaimed landscape to route water efficiently to sediment ponds. Refer <br />to Map 12 and Map 12A and Exhibit 7 for the location and information about these various pond, <br />depressions and ditch structures. <br /> <br />Surface Water Quality <br /> <br />General Area <br /> <br />Surface water quantity in the general area is variable and inconsistent from drainage to drainage. <br />Drainages in the general area have not received the attention that the drainages adjacent to and <br />within the permit area have received because there is no hydrologic connection between these <br />areas. Flow estimates and water balance calculations for these areas have not been examined <br />because they will not be disturbed by the Colowyo Mine. <br /> <br />Permit Area <br /> <br />The drainages that have been the most intensively studied in and adjacent to the mine area include <br />Taylor Creek, Goodspring Creek and Wilson Creek. Continuous flow recorders have been <br />maintained on Taylor Creek and Wilson Creek by the USGS since 1974. A continuous recorder <br />was operated on Goodspring Creek from 1974 to 1978. The flow information resulting from these <br />gages is presented in Table 2.04.7-8. <br /> <br />These data reflect the highly variable nature of surface flows in the drainages. Taylor Creek, the <br />intermittent stream, had mean monthly flows of 0.0 cubic feet per second (cfs) for much of the <br />period of record. Mean flows greater than 0.0 cfs were extremely low and reached a peak of 2.80 <br />cfs in May 1980 reflecting the high snowmelt generated runoff. The maximum and minimum <br />monthly flows also included for Taylor Creek give a further insight into its dependence on <br />snowmelt and rainstorm runoff. This information supports the contention of very limited <br />groundwater seepage to sustain flows near the mining area. The maximum daily flow value of <br />18.00 cfs in February, 1980 was a result of high snowmelt runoff and rainfall on a melting <br />snowpack. Minimum flows of 0.0 cfs again reflect the highly sporadic nature and intermittency of <br />this stream.