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RULE 2 PERMITS <br />state, and it is replaced in an unconsolidated condition. While it is impossible for the mining and <br />reclamation operation to reconstruct the stabilizing affects of these drainages in bedrock, it is possible and <br />desirable to recreate the stabilizing affects of the rock protection. This method has been elected to armor <br />and stabilize the permanent stream channels constructed or to be constructed at the Colowyo Mine site. A <br />summary of these channels is presented below, and the location of the areas to receive rock riprap <br />protection are shown on Map 12- Hydrology, South. <br />TIRO+i-.+i- <br />Southwest Tributary to Streeter <br />South East Tributary to <br />Streeter <br />Streeter Gulch <br />Gulch A <br />Section 11 Ditch <br />Prospect <br />Final East Pit <br />Section 16 Fill <br />South Connection <br />West Pit <br />Taylor Tributary <br />West Pit Fill <br />Permanent Drainage Channels <br />Total <br />Length of Drainag e Channels - Feet <br />Unprotected Rock Protected Total <br />0 3,200 3,200 <br />2,500 4,000 6,500 <br />5,700 13,000 18,700 <br />0 7,500 7,500 <br />0 1,000 1,000 <br />1,400 2,200 3,600 <br />1,200 4,600 5,800 <br />0 900 900 <br />0 1,200 1,200 <br />2,700 14,300 17,000 <br />2,500 11,500 14,000 <br />1,300 5,000 6,300 <br />17,300 68,400 85,700 <br />This rock riprap protection in the channels on steep slopes will pass the intermittent low flows normally <br />found in the area and approximate the original cascading flows while protecting the channel during the <br />infrequent high flows the design event is likely to produce. Given time, vegetation will encroach portions <br />of these channels, debris will accumulate and the stream will again reach a state of dynamic equilibrium. <br />Calculation for rock riprap sizing and gradation are found in Exhibit 7. <br />Rule 2 Permits 2.04.7-37 Revision Date: 6/23/08 <br />Revision No.: MR-91