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III. HYDROLOGIC BALANCE -RULE 4.05 <br />A. Water Ouality Standards and Effluent Limitations <br />Receiving stream standards for the Yampa River and its tributaries have been <br />set by the Colorado Department of Health in their publication, "Classification <br />and Numeric Standards for Upper Colorado River Basin and North Platte <br />River (Planning Region)". Dry Creek is within segment 12 of the Upper <br />Colorado River sub-basin and basin. Colorado Department of Health NPDES <br />(National Pollution and Discharge and Elimination System) limitations on <br />dischazge and the Division's standards for determining material damage to the <br />hydrologic balance ("Division Procedures for the Assessment of Material <br />Damage with Respect to Alluvial Valley Floors, the Cumulative Hydrologic <br />Impact Assessment and Subsidence at Coal Mines") are based in part on these <br />standards. <br />1. Most disturbed area drainage passes through one of two existing sediment <br />ponds (see SAE's described in # 2, below). Dischazges from these ponds <br />are monitored to verify compliance with water quality standazds and <br />effluent limitations (4.05.2(2)). <br />2. The Division has approved three small areas (SAE'S) to be exempted from <br />the use of sediment ponds due to the limited size of azeas and due to the <br />fact that ponds and treatment facilities aze not necessary for the drainage <br />to meet the effluent limitations of Rule 4.05.2 and applicable State and <br />Federal water quality standards for receiving streams. These areas have <br />also been exempted because no mixing of surface drainage with a <br />discharge from underground workings will occur. Exemptions from use <br />of sediment ponds have been approved for three topsoil stockpiles. <br />Documentation of these exemptions is found in Volume 12, Tab 12 of the <br />permit application (4.05.2(3)(b)(i)). <br />B. Diversions and Conveyance of Overland Flow <br />All diversions within the permit area aze designed and constructed in <br />accordance with Rule 4.05.3. Designs are discussed in the text and <br />diversion locations are displayed in Exhibit 12-1 and Exhibit 12-2 of <br />Volume 2, Tab 12 of the permit app]ication (4.05.3). <br />C. Stream Channel Diversions <br />1. No permanent stream channels aze proposed to be diverted. <br />16 <br />