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SEDIMENT CONTROL <br />Two sedimentation ponds are located at the Hayden Gulch Loadout, the Truck Loop <br />Pond (Outfall OOlA) which treats runoff from the "truck dump loop", including a <br />portion of the 2,000,000 ton per year operation coal stockpile, and the Rail <br />Loop Pond (OUtfall 002A) which treats runoff from the railcar unloading area, a <br />portion of the coal stockpile, the conveyors and the truck loadout area. The <br />contributing watershed areas, site drainage Control and pond locations are <br />shown on Exhibit 12-2, Surface Water Control Plan Map. The pond <br />configurations, including storage-area curves are presented in Exhibit 12-3, <br />Truck Loop Pondl Existing Condition, and Exhibit 12-4, Rail Loop Pond2 Existing <br />Condition. <br />Pond Design and As-Built Certification <br /> These ponds were designed, permitted and constructed in 1960 by the Loadout <br /> facilities previous owner/operator, H-G Coal Company, as part of Permit C-80- <br /> 003. Designs for the ponds were originally included in the H-G Coal Company <br /> permit package. At that time, H-G Coal Company demonstrated that the ponds <br /> were in compliance with Colorado Mine Land Reclamation Board (CMLRB) Rule <br /> 4.05.6 and Rule 4.05.9. <br /> Truck Loop Pond <br />As noted above, the Truck Loop Pond was constructed by the facilities previous <br />owner, H-G Coal Company. The pond waa constructed as a dugout or sump <br />configuration. A certification report, dated April 1986, stating the pond was <br />constructed in accordance with initial design and applicable CDMG regulations <br />is presented in Appendix 12-1A, Pond Certifications. <br />There have been several minor modifications to the Truck Loop Pond since <br />initial construction was completed. In February 1990, H-G Coal Company <br />submitted a Technical Revision application to modify the outlet structure. A <br />24-inch CMP drop inlet riser pipe was installed as the principal spillway, and <br />a 12-inch CMP straight pipe was installed as the emergency spillway. An as- <br />built certification of the 24-inch drop inlet structure was submitted to CMLRD <br />in a letter report dated February 5, 1991. A copy of the 1991 certification is <br />presented in Appendix 12-1A. <br /> A certification report and as-built drawing certifying that the outlet <br />• modification was <br />4.05 <br />6(3)(d) was constructed <br />submitted to as designed and that it met the requirements of <br />Colorado Division of Minerals and Geology (CDMG) <br /> . <br /> TR-06 12-1.1 Aevis ed OS/OS <br />