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<br />2. The Division proposes to grant a small azea exemption from use of <br />sediment ponds due to the limited size of the area and because ponds <br />and treatment facilities are not necessary for the drainage to meet the <br />effluent limitations of Rule 4.05.2 and applicable State and Federal <br />water quality standards for receiving streams and because no mixing of <br />surface drainage with a discharge from underground workings will <br />occur. The small area to be exempted is the topsoil stockpile next to <br />the sediment pond. This pile is luxuriantly vegetated and was judged <br />to have a cover greater than the surrounding undisturbed azea. <br />(4.05.2(3)(b)(i)). <br />3. This mine does not discharge water from the portal; therefore, an <br />exemption from use of sediment ponds for drainage from underground <br />mine workings is not necessary for the drainage to meet effluent <br />limitations of Rule 4.05.2 and applicable State and Federal water <br />quality standazds for receiving streams. No specific approvals aze <br />required in this section. This mine is in compliance with this section. <br />(4.05.2(3)(b)(ii)). <br />4. At this operation, a manual lime feeder is not necessary since this <br />mine has never discharged. Water has never been noted to be <br />discharging from the pond nor has acidic or acid forming materials <br />been found at the mine. No specific approvals are required in this <br />section. This mine is in compliance with this section. (4.05.2(8)(a)). <br />C. Diversions and Conveyance of Overland Flow <br />1. No asphalt, concrete, or other armoring used as a lining will be used <br />in a permanent diversion. (4.05.3(2)). <br />2. No diversion is proposed to be constructed on an existing landslide. <br />(4.05.3(4)). <br />D. Stream Channel Diversions <br />1. No diversions are proposed of an ephemeral stream draining at least <br />one square mile, nor diversion of an intermittent or perennial stream <br />are proposed. (4.05.4(1) and (4)) <br />2. Channel lining structures and artificial channel roughness structures <br />are proposed for use to control erosion. These means are proposed to <br />be approved by the Division since they are necessary to control <br />O.C. Mine No.2 Findings 23 May 15, 1992 <br />