REV99653 - Laserfiche WebLink

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Review Comments 1. Amended Map 77 indicates certain refuse area ditch segments which are currently in their permanent location and will be subject to permanent stabilization ditch designs. The mapping as presented does not provide sufficient precision to delineate the exact location and length of the existing permanent ditch segments. The currently existing permanent ditch segments on RP-2/3 and RP-4 should be narratively described with sufficient specificity so as to be clearly identifiable in the field, and the permanent control measures to be implemented in those specific segments should be described. 2. With respect to RP-5A, it is our understanding that the eastside and west side perimeter containment ditches as depicted on Map 77A, and as they exist in the field, are in their permanent location, and will be subject to permanent ditch stabilization requirements. Please let us know if this is not the case. 3. Page IV-24, at the top of the second paragraph, includes the statement that "WFU will maintain drainage and sediment control during the refuse pile construction and prior to final reclamation on an as needed basis." This statement should be revised to clarify that the operator will maintain drainage and sediment control structures so that they are stable and functional at all times, until final bond release is approved. 4. Also on Page IV-24, the third paragraph indicates that permanent diversion ditches will be designed to pass the runoff from a 100 year, 24 hour storm. The paragraph should be amended to clarify that interim or "in pit" refuse area perimeter ditches will also be sized in accordance with the referenced designs to pass the runoff from a 100 year, 24 hour storm. These ditches should be field checked to verify that capacities are in accordance with design specifications presented in Illustration 5 and Illustration 6A, of the permit application (including the required .3 feet of freeboard). 5. Page IV-24A depicts the typical rock check dam to be used for "in pit" ditch control. It is not apparent in this drawing whether the design would provide capacity above the dam to convey the design flow depth plus the required .3 feet of freeboard. Please revise the drawing or specify in the narrative the ditch capacity to be provided above the top of the dam. 6. Paragraph 5 of amended Page IV-25 references Map 81 and Map 95 as showing reclamation contours and final cross Sections of Refuse Areas 1 through 4. The reference appears to be erroneous or outdated. Map 81 final reclamation contours appears to have been replaced by Map 77, and reclamation cross sections are depicted on Map 83. Map 95 is a road plan and profile. This should be clarified.