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Section 816.71 (b) Continued. <br />• <br />regulatory authority. <br />Both fill structures have been designed by CTL/Thompson, Inc. a firm <br />of experienced consulting geotechnical and materials engineers. These <br />designs are based on sound engineering practice and have been certified <br />by Robert Thompson, a registered professional engineer. The <br />calculations and designs for the fill structures are detailed in <br />Exhibit 9, Excess Spoil. <br />(c) All vegetative and organic materials shall be removed from the disposal <br />area and the topsoil shall be removed, segreyated, and stored or replaced <br />under Sections 816.21-816.25. If approved by the regulatory authority, <br />organic material may be used as mulch or may be included in the topsoil to <br />control erosion, promote growth of vegetation, or increase the moisture <br />retention of the soil. <br />• Prior to depositing any fill on the disposal sites, woody plants will <br />be knocked over and removed from the site by bulldozing or will be <br />incorporated into the topsoil. This topsoil will be removed, <br />segregated, and stored or redistributed as explained in Sections <br />816.21-816.25 and according to the plan described in Section 780.18. <br />(d) Slope protection shall be provided to minimize surface erosion at the <br />site. Diversion design shall conform with the requirements of Section <br />816.43. All disturbed areas, including diversion ditches that are not <br />rip-rapped, shall be vegetated upon completion of construction. <br />Surface erosion will be minimized through the use of diversion ditches <br />which have been designed according to the specifications in Section <br />816.43. The locations of these diversions are shown on the Energy <br />Mines No. 1 and 2 Hydrology (Map 13), Eckman Park Hydrology (Map 14) <br />and Permit Renewal Map 9A, Hydrologic Features/Sediment Control. Their <br />design is set forth in Figure 32, <br />• <br />89-23 816-89 Revised 02/22/89 <br />