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C. Stream Channel Diversions <br />The Division does not propose to approve the diversion of an ephemera] <br />stream draining at least one (1) square mile, an intermittent or a perennial <br />stream (4.05.4(1) and (4)). <br />2. Channel lining structures, retention basins, and artificial channel <br />roughness structures aze proposed for use to control erosion. These means <br />were approved by the Division, since they are necessary to control <br />erosion, they are stable and will require infrequent maintenance <br />(4.05.4(2)(a)). <br />D. Sediment Ponds <br />The Division approved altemative design criteria or specifications for use <br />in sediment pond design and/or construction. The gob pile pond (Pond D) <br />has an embankment with slopes steeper than typical requirements. Bowie <br />Resources, Limited provided the required geotechnical stability analyses <br />to justify the implementation of steeper embankment slopes. Sediment <br />pond design details aze presented in Section 2.05 and Volume III, Exhibit <br />8 of the permit application document (4.05.6(] 1)). <br />E. Acid-forming and Toxic-forming Spoil <br />Based upon information provided by BRL, the Division does not <br />anticipate that any acid-forming or toxic-forming spoil will be <br />encountered during the operation of the Bowie No. 2 Mine (4.05.8(3)). <br />F. Impoundments <br />The applicant has not proposed the use of altemative design criteria and <br />specifications for impoundment design and construction (4.05.9). <br />G. Surface and Groundwater Monitoring <br />The applicant will conduct monitoring of surface and ground waters in a <br />manner approved by the Division. The surface and ground water <br />monitoring plan is specified in Section 2.05.6(3)(b)(iv) of the Bowie Nn. 2 <br />Mine permit application (4.05.13(1)). BRL monitors surface water quantity <br />and quality in perennial streams, irrigation ditches, ephemeral drainages, <br />and several springs, both upstream and downstream from the azeas <br />affected by mining. Ground water levels and quality aze monitored in the <br />D-2 coal seam and the North Fork alluvium. Monitoring and reporting of <br />mine inflows was added [o the hydrology monitoring plan with the <br />approval of Permit Revision No. 2. <br />27 <br />