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RULE 4 PERFORMANCE STANDARDS <br />This plan remains essentially unchanged except for the following changes: <br />6900 North Well - Streeter Fill -_During the summer of 1984, the shallow 6900 north <br />well collapsed. It was later determined that since this. well monitored only a small <br />perched zone within the fill, reestablishment of the well would not be necessary. <br />Refer to the 1984 Annual Report for additional details. <br />2. 6900 South Well - Streeter Fill - It was noted on March 21, 1986 that this piezometer <br />well had also collapsed. This well was reestablished in the fall of 1986. For further <br />details concerning this well, refer to the 1986 Annual Report. <br />3. New Upper Good Spring Creek Surface Water Monitoring Site This site replaced the <br />Upper Good Spring Site to allow for mine expansion. Monitoring shall utilize any <br />equipment, structures, devices or methods necessary to measure and sample <br />accurately the quality and quantity of surface water. Refer to Map IOB for site <br />location. <br />These commitments have satisfied the requirements of Stipulation 1 in the Findings <br />document. <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, <br />W6900N, W6700 and two collapsed piezometer wells), Section 16 Fill well, and the West Pit <br />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 <br />obtains all or part of a supply of water for domestic, agricultural, industrial or other legitimate <br />use from an underground or surface source where the water supply has been affected by the <br />mining operation. <br />Colowyo does not anticipate that any water supply or water right of any owner of interest will be <br />affected by the mining operation. Detailed information on the Colowyo augmentation plan is set <br />forth in the 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 />Rule 4 Performance Standards 4-23 Revision Date: 4/2/18 <br />Revision No.: RN -07 <br />