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6.0 SURFACE DRAINAGE CHANNELS <br />Surface drainage channels shall consist of 1) perimeter drainage <br />channels along the east and west toes of the refuse pile; 2) temporary collection <br />channels along the refuse pile benches; and 3) collection channels located <br />southeast and southwest of the refuse pile. The existing diversion channel <br />north of the refuse disposal plan will serve as a collection channel, whereas the <br />existing channel located along the base of the steep sloping face to the south <br />will serve as a temporary diversion ditch. As the refuse pile grows southwazd, <br />a second ditch shall be constructed south of the final refuse disposal plan to <br />serve as a permanent diversion channel. Hydrologic and hydraulic design <br />criteria for these channels are presented in Section 8.0 of this report. Initially, <br />the perimeter and temporary channels shall be constructed as shown in F4gure <br />2. All perimeter channels and the southeast and southwest collection channels <br />on the refuse pile will be riprapped with hard, durable, non-toxic forming rock <br />such as sandstone. Sandstone obtained from the access road construction will <br />be utilized if it meets gradation criteria as presented in Table 4. <br />14 <br />