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II. Hydrologic Balance -Rule 4.05 A. Water Quality Standazds and Effluent Limitations The Division granted small area exemptions from the use of sediment ponds due to the limited size of the areas and due to the fact that ponds and treatment facilities are not necessary for the drainage to meet the effluent limitations of Rule 4.05.2 and applicable State and Federal water quality standazds for receiving streams. Also, no mixing of surface drainage with a discharge from underground workings would occur. The small azeas exempted are as follows: a. The south end of the railroad tracks from the permit boundary north to the hopper. This azea has been previously approved for Phase I, Phase II, and Phase III bond release. b. The small azea north of Tipple Pond No. 4. c. Those areas of West Ridge, Center Ridge and the Moffat Area where mining progressed to the ridge line and the pits were daylighted. d. The former Trout Creek water pump pad, located west of the Moffat pond. Drainage from this azea was passed through a rock filter and fabric fence prior to leaving the permit area [Rule 4.05.2(3)(b)(i)](all reclaimed). Small area exemptions in the Tipple Area aze depicted on Exhibit 4.6-21 of the PAP. West Ridge exemptions are on Exhibit 4.6-17, Center Ridge on Exhibit 4.6-23, and Exhibit 4.6.2 depicts exemptions for the Moffat Area and Trout Creek pump pad. B. Sedimentation Ponds The Division previously approved permanent retention of the Moffat, Center Ridge, and West Ridge ponds, based on the following: a. The quality of the impounded water was suitable on a permanent basis for its intended use, and dischazge from the impoundments met applicable State and Federal water quality standazds [Rule 4.05.9(13)(a)]. The intended uses of water in the Moffat, Center Ridge, and West Ridge impoundments were recreation, fish and C-1980-001 Permit Renewal 5 Findings Page 21 of 33 Pages