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A. Water Quality Standards and Effluent Limitations -Rule 4.05.2 <br />I. Most disturbed area drainage passes through one often sediment ponds. Discharges from <br />these ponds are monitored (see page 4.05-15, Permit) to verify compliance with water quality <br />standazds and effluent limitations [Rules 4.05.2(1) and (2)]. There are no dischazges from <br />underground workings. <br />2. The Division has approved small azeas to be exempted from the use of sediment ponds due to <br />the limited size of azeas and due to the fact that ponds and treatment facilities aze not necessary <br />for the drainage [o meet the effluent limitations of Rule 4.05.2 and applicable State and Federal <br />water quality standards for receiving streams. These areas have also been exempted because no <br />mixing of surface drainage with a discharge from underground workings will occur. Exemptions <br />from use of sediment ponds have been approved for two topsoil stockpiles adjacent to the mine <br />access road and several topsoil stockpiles next to the Section 11 perimeter ditch. Documentation <br />of these exemptions is found in Minor Revision 15 to the Permit, approved on November 24, <br />1989. [Rule 4.05.2(3)(b)(I)] <br />B. Diversions and Conveyance of Overland Flow -Rule 4.05.3 <br />1. Colowyo collects all runoff from disturbed areas and conveys it to sediment ponds by means <br />of perimeter ditches. Al] such diversions within the permit area are designed and constructed in <br />accordance with Rule 4.05.3. Designs are discussed in Exhibit 7 of the Permit and diversion <br />locations are found on Maps 11 and 12 of the Permit [Rule 4.05.3(1)]. Road ditches are also <br />designed to convey ditch flows. Drainage ditches, etc,, internal to the pits and work azeas are not <br />designed or defined (within Permit language). <br />2. Channel lining structures, retention basins, and artificial channel roughness structures are used <br />to control erosion in drainage channels to be established during reclamation of mined areas. <br />These means are approved by the Division since they are necessary to control erosion. These <br />34 Revised October 30, 1997 <br />