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-5- Sediment Control - CCMC The disturbance of land at mines exposes bare soil and overburden which is highly susceptible to erosion. Erosion, intern, causes an unnatural sediment Zoad on receiving streams. Sediment is harmful to the environment in many ways. Zt can carry suspended pollutants, destroy aquatic habitats, alter the floodplain, z-educe stream channel capacity, pose a treatment or maintence problem for downstream treatment plants and irrigators. To reduce this mining related impact the operator will treat all disturbed drainage before it leaves the permit boundary. The treatment scheme is termed the sediment control system. This control system consists of collection ditches which route disturbed runoff into settling, or sediment ponds. while in the ponds, sediment in the water settles to the bottom and clearer water is decanted from the pond. Mined Land Reclamation Division Rule 9.05 contains specific design and performance standards that apply to the sediment control system. The application has been reviewed in relation to this rule. Design calculations and narrative can be found in Volume I, Section 2.05, page 13-25, Section 9.05, page 9, and Section V of the response document. No exemptions from sediment control or effluent quality limitations were requested or granted. The operator was however, granted a variance from two design requirements. Normally, ponds are required to be dewatered automatically. The Division granted a variance from this requirement since all ponds will be incised below ground level. Manual dewa tez-i ng devices are the only practical method in this case. Another variance was granted from the requirement of submitting detailed pond dimensions. This was granted since the ponds were incised and will need to be field built to accommodate natural land features. However, to ensure that the pond will 6e built to the propor size the Division imposes the following stipulation: