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~/ <br />Appendix 13-12.1-F <br />Pond 012 and Pond 012A Two-Pond System Design <br />Introduction <br />This appendix presents the Pond 012 and Pond 012A Two-Pond System <br />Design. The design incorporates the existing, and approved, Pond 012A <br />design configuration (see Appendix 13-12.1-C; starting on page 13-12.1- <br />45) and the existing, and approved, Pond 012 as-built configuration <br />(see Attachment 13-12A). This design has been prepared to show the <br />minimum storage capacity needed in Pond 012 to meet the regulatory <br />requirements of Rules 4.05.2, 4.05.6 and 4.05.9 of the Regulations of <br />the Colorado Mined Land Reclamation Board for Coal Mining. <br />Sediment storage capacity for the 10-year, 24-hour storm event was <br />maximized by increasing the number of storage years in the <br />sedimentology subroutine until the effluent settleable solids <br />concentration in the pond discharge exceeded the water quality criteria <br />(0.5 milliliters per liter [ml/1]), or the model results indicated the <br />difference between the calculated top of sediment storage and the <br />principal spillway invert elevation was within, or near, the range <br />recommended by Warner et al (1998). The sediment storage capacity for <br />the 25-year, 24-hour event was a user input value that was equal to the <br />elevation calculated in the 10-year, 24-hour demonstration. <br /> <br />TR-37 13-12.1-150 Revised 08/08 <br />