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RULE 4 PERFORMANCE STANDARDS <br /> This plan remains essentially unchanged except for the following changes: <br /> 1. 6900 North Well - Streeter Fill -_During the summer of 1984, the shallow 6900 north well <br /> collapsed. It was later determined that since this well monitored only a small perched zone <br /> within the fill, reestablishment of the well would not be necessary. Refer to the 1984 Annual <br /> Report for additional details. <br /> 2. 6900 South Well - Streeter Fill -_It was noted on March 21, 1986 that this piezometer well <br /> had also collapsed. This well was reestablished in the fall of 1986. For further details <br /> concerning this well, refer to the 1986 Annual Report. <br /> 3. New Upper Good Spring Creek Surface Water Monitoring Site This site replaced the Upper <br /> Good Spring Site to allow for mine expansion. Monitoring shall utilize any equipment, <br /> structures, devices or methods necessary to measure and sample accurately the quality and <br /> quantity of surface water. Refer to Map l OB for site location. <br /> Colowyo will measure the quantity and quality of any discharges from the permit area in compliance <br /> with the NPDES Permit. <br /> 4.05.14 Transfer of Wells <br /> Colowyo does not plan to transfer any monitoring wells to water wells. <br /> The 13 permitted and bonded wells (11 monitoring and 2 potable) include TC-1, TC-3, North <br /> Goodspring Well, A-6 Well, A-3 Well, Gossard #1 Well, 5 Streeter Fill Wells (W6900S, W6900N, <br /> W6700 and two collapsed piezometer wells), Section 16 Fill well, and the West Pit Fill well. <br /> 4.05.15 Water Rights and Replacement <br /> Colowyo, if necessary, will replace the water supply of any owner of interest in real estate who obtains all <br /> or part of a supply of water for domestic, agricultural, industrial or other legitimate use from an <br /> underground or surface source where the water supply has been affected by the mining operation. <br /> Colowyo does not anticipate that any water supply or water right of any owner of interest will be affected <br /> by the mining operation. Detailed information on the Colowyo augmentation plan is set forth in the <br /> Hydrology Information Exhibit(Exhibit 7). <br /> 4.05.16 Discharge of Water into an Underground Mine <br /> No surface water will be diverted into any underground mine workings. <br /> 4.05.17 Post-mining and Rehabilitation of Sedimentation Ponds,Diversions,Impoundments,and <br /> Treatment Facilities <br /> No treatment facilities are planned. Approved permanent sedimentation ponds, stock ponds, and <br /> permanent diversions will be left in place. These structures will be maintained in an appropriate condition <br /> before the Permit area is abandoned by repairing any necessary portions, cleaning sediment and debris <br /> out,establishing appropriate vegetation and providing soil stabilization. <br /> Rule 4 Performance Standards 4-20 Revision Date: 5/11/18 <br /> Revision No.: MR-187 <br />