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South fan. <br />Sediment Pond 4: Sediment Pond 4 is designed and constructed to treat the runoff from a 10-year/24 <br />hour storm event and safely pass the runoff from a 25-year/24-hour storm event as required by the <br />Rules. Pond 4 receives the runoff from the refuse pile, the borrow area, the topsoil stockpile and the <br />subsoil stockpile. With the approval of Technical Revision 34 (approved on 28 October 2002), EFCI <br />changed the primary spillway design to be self-dewatering. The Division reviewed the engineering <br />designs and SEDCAD models and determined that the revised spillway design criteria had been met. <br />EFCI submitted engineer certified as-built drawings for Pond 4 as required by the Rules. <br />Sediment Pond 5: Sediment Pond 5 is designed and constructed to treat the runoff from a 10-year/24 <br />hour storm event and safely pass the runoff from a 25-year/24-hour storm event as required by the <br />Rules. Pond 5 receives the runoff from the portal and facilities areas, the coal stockpile area, the Pond <br />1, Pond 2 and "bone yard" areas, the regraded Pond 3 area and some undisturbed runoff. With the <br />approval of Technical Revision 34 (approved on 28 October 2002), EFCI changed the primary spillway <br />design to be aself-dewatering. The Division reviewed the engineering designs and SEDCAD models <br />and determined that the revised spillway design criteria had been met. EFCI has submitted engineer <br />certified as-built drawings for Pond 5 as required by the Rules. <br />The Division finds that Pond 4 and Pond 5 have been designed, sized and constructed in compliance <br />with the approved plan and Rule 4.05.6. <br />Roadside Ditches and Culverts: The Southfield Mine road ditches run along the haul road between <br />the refuse pile and Pond 5, and along County Road 92 to Pond 5. There are two culverts that run under <br />the respective roads. The road ditches and culverts have been designed to safely carry the flow from a <br />25-year/24-hour storm event. Prior to their construction and/or modification, the Division reviewed all <br />engineering designs and SEDCAD demonstrations and determined that they were designed and <br />constructed as required by the Rules. <br />The Division finds that the roadside ditches and culverts have been designed and constructed in <br />compliance with the Rules and that they will function as designed. <br />Southfield Mine Permit No. C-1981-014 <br />SL-2 Findings 29 25 April 2003 <br />