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applicable State and Federal water quality standards for receiving streams, and <br />also due to the fact that no mixing of surface drainage from these areas with a <br />discharge from underground workings will occur. The small areas to be exempted <br />are listed in Section IV.J.5 of the application. Sedimentation demonstrations for <br />the SAE's are provided in Illustration 44, Volume 12, and the locations are shown <br />on Map 147 (4.05.2(3)(b)(i)). <br />B. Stream Channel Diversions <br />The Division approved the diversion of an ephemeral stream draining at least <br />one square mile. Scullion Gulch has been diverted with a large diameter pipe <br />culvert such that it passes beneath the D Portal facilitates area. The decision <br />to approve this diversion was based on a finding that the proposed diversion <br />meets the requirements of 4.05.18 and 4.05.4, applicable local, State, and <br />Federal statutes and regulations, and that the diversion is designed to <br />safeguard the public safety and to minimize adverse impacts to the <br />hydrologic balance (4.05.4(1) and (4)). <br />C. Sedimentation Ponds <br />Sediment ponds are discussed under Section IV.J.1 Volume IV of the permit <br />application. <br />The applicant uses sedimentation ponds in all disturbed drainages to control the <br />increased sediment loads within the ephemeral drainages on the mine site. All <br />sediment ponds are designed to contain or treat the 10 -year, 24 -hour event and <br />safely pass the 25 -year, 24 -hour event, at a minimum. <br />An alluvial well field near the confluence of Scullion Gulch and the White River <br />was originally developed to supply water for mine operations. The 1984 <br />completion of Kenney Reservoir east of Rangely, Colorado inundated much of the <br />alluvial well field. Because the alluvial surface is almost completely submerged <br />by the reservoir, recharge to the alluvium is now instantaneous. Due to <br />inundation of the well field by the reservoir, and due to high salinity of the <br />alluvial well water, the operator pumps water directly from the White River into <br />an adjacent lagoon formed by the Kenney Reservoir. Approval to pump directly <br />from the raw water lagoon to the raw water system was affirmed in Permit <br />Renewal No. 2 in 1994. Only one alluvial well, Qal -5, located at the mouth of <br />Scullion Gulch, remains in use as a monitoring well. <br />The raw water lagoon is a semi -in situ impoundment that collects water from the <br />White River. The Division approved (MR -55) the construction of a dike that <br />separates Scullion Gulch drainage from the lagoon area. The location of the dike <br />and its access road are shown on Map 90 of the PAP. <br />D. Surface and Ground Water Monitoring <br />30 <br />