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sedimentation ponds. The coal refuse storage area is surrounded by refuse <br />collection ditches which route runoff from the coal refuse pile to <br />Sedimentation Pond No. 4. Six (6) culverts are utilized in the mine area, <br />and three (3) in the loadout area. <br />Designs for all the above mentioned ponds, diversions, ditches and <br />culverts as well as all other drainage and sediment control structures <br />utilized in the Southfield mine and loadout areas have been approved, and <br />the structures have been constructed and currently exist. Post <br />construction pond certifications for Ponds 1, 2, 3, 4, 5 and L2 are <br />contained in Appendix A, Post Construction Pond Certifications. No <br />additional ponds, diversions, ditches or other structures are proposed. <br />The original design methodology, assumptions, parameters and calculations <br />for the loadout structures are submitted as approved, and are based upon <br />applicable regulations at the time of approval. All mine area structures <br />have been revised since their initial approval, hence, the revised <br />methodology, parameters and calculations are submitted. <br />The mine area ponds, diversions, ditches, culverts and associated <br />structures are located on the Drainage and Sediment Control Map, (Map 20). <br />The loadout area ponds, ditches and associated structures are located on <br />the Loadout Area Surface and Groundwater Hydrology Map (Map 13). Design <br />drawings for all structures are also contained in the permit and are <br />referenced as appropriate in this exhibit. <br />There are three (3) Small Area Exemptions located within the Southfield <br />mine area. These areas are exempt from full scale drainage and sediment <br />control requirements. The three (3) areas are shown on the Drainage and <br />Sediment Control Map, (Map 20), and are listed below: <br />o Roadside Topsoil Stockpile <br /> <br />2 R Revised - December, 1991 <br />