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• The west and north refuse collection ditches are not affected by the <br />refuse pile expansion, however their designs are contained in this <br />exhibit. <br />The watershed draining to Sediment Pond No. 4 was not significantly <br />affected by the refuse pile expansion. Hydrology and sedimentology <br />calculations were completed which verified that the pond's capacity is <br />adequate to contain the required surface runoff and sediment volume. <br />The pond's outlet structures were also determined to be adequate. <br />The methodology utilized to complete this exhibit is explained in detail <br />in the Methodology Section of this report. Drawings showing structure <br />locations and design details are also contained within this report and <br />supersede all previous maps and detail drawings referencing the subject <br />structures. Hydrology calculations and hydraulic design calculations <br />are contained in Appendix A, Hydrology Calculations, and the section <br />• titled, Diversion and Collection Ditch Hydraulic Design Calculations, of <br />this report, respectively. <br />• <br />-3R- Revised - February, 1990 <br />