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<br />• an approximate depth of 20 inches along the channel bottom and <br />sideslopes. In order to stabilize the riprap, appropriate bedding <br />material will be placed and spread to a depth of four (4) to six (6) <br />inches prior to riprap placement. <br />Design details and channel characteristics for each channel section are <br />illustrated by Figure 2. Design Detail - Permanent Diversion fl. <br />REFUSE COLLECTION DITCHES <br />The refuse collection ditches are located around the perimeter of the <br />refuse disposal area as shown on Figure 1, Refuse Disposal Area Drainage <br />Plan. For design purposes, three (3) main refuse collection ditches <br />have been delineated: <br /> - Mest Refuse Collection Ditch <br /> - North Refuse Collection Ditch <br />• - South Refuse Collection Ditch <br />All ditches are designed to safely pass the 100-year. 24-hour storm <br />event providing 0.3 feet of freeboard. Peak flows calculated by SEDCAD+ <br />for each channel are shown on Figure 3, Design Detail - Refuse <br />Collection Ditches. <br />Mest Refuse Collection Ditch <br />The west collection ditch extends along the western boundary of the <br />refuse disposal area between the toe of the refuse pile and Permanent <br />Diversion /1 as shown on Figure 4, Disposal Area - West Boundary Section <br />A-A'. The west collection ditch collects all surface drainage flowing <br />off the west edge of the pile and routes it to the northwest corner of <br />the pile where it flows into the north refuse collection ditch. <br /> The west refuse collection ditch is divided into three (3) sections as <br /> <br />• shown on Figure 1, Refuse Disposal Area Drainage Plan. Each section has <br />-10- <br />