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A. Water Quality Standards and Effluent Limitations <br /> Receiving stream standards for the Yampa River and its tributaries have been set by the <br /> Colorado Department of Health in their publication, "Classification and Numeric <br /> Standards for Upper Colorado River Basin and North Platte River Planning Region)". <br /> Dry Creek is within segment 12 of the Upper Colorado River sub -basin and basin. <br /> Colorado Department of Health NPDES (National Pollution and Discharge and <br /> Elimination System)limitations on discharge and the Division's standards for <br /> determining material damage to the hydrologic balance (" Division Procedures for the <br /> Assessment of Material Damage with Respect to Alluvial Valley Floors, the Cumulative <br /> Hydrologic Impact Assessment and Subsidence at Coal Mines") are based in part on <br /> these standards. <br /> 1. Most disturbed area drainage passes through one of two existing sediment ponds (a <br /> small amount of disturbed area drainage passes through SAE's, described in #2 <br /> below). Discharges from these ponds are monitored to verify compliance with water <br /> quality standards and effluent limitations (4.05. 2(2)). <br /> 2. The Division has approved sixteen small areas ( SAE's)to be exempted from the use <br /> of sediment ponds due to the limited size of areas and due to the fact that ponds and <br /> treatment facilities are not necessary for the drainage to meet the effluent limitations <br /> of Rule 4. 05. 2 and applicable State and Federal water quality standards for receiving <br /> streams. These areas have also been exempted because no mixing of surface drainage <br /> with a discharge from underground workings will occur. Three small area exemptions <br /> are permitted for the three topsoil stockpiles (TS -1, a portion of TS -2, and TS -3) <br /> associated with the loadout and six topsoil stockpiles (A, C, D, E, F, and G) and one <br /> temporary waste stockpile (TWS) associated with the TAHR outside the sediment <br /> control system. The remaining SAES consist of the rail loop, drainage from an <br /> electrical substation located at the office trailer location, the office/parking lot/leach <br /> field, two areas designated as " areas 1 and 2" on Exhibit 12- 2, and H -G shallow <br /> well and associated pipeline corridor. Documentation of these exemptions is found in <br /> Volume 12, Tab 12 of the PAP (4.05. 2(3)(b)(i)). <br /> B. Diversions and Conveyance of Overland Flow <br /> 1. All diversions within the permit area are designed and constructed in accordance <br /> with Rule 4.05. 3. Designs are discussed in the text and diversion locations are <br /> displayed in Exhibit 12- 1 and Exhibit 12- 2 of Volume 2, Tab 12 of the PAP <br /> (4.05.3). <br /> C. Stream Channel Diversions <br /> 1. No stream channels are proposed to be permanently diverted. <br /> D. Sedimentation Ponds <br /> 17 <br />