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• toxic forming rock such as sandstone. Sandstone obtained <br />from the access road excavation will be utilized if it meets <br />gradation criteria as presented below. <br />Sieve Size Percent Passing <br />24 inch 100 <br />18 inch 80-100 <br />12 inch 40-60 <br />9 inch 20-40 <br />6 inch 10-25 <br />3 inch 0-15 <br />The perimeter collection channels to be extended as the pile <br />advances will follow the existing ground surface grade which <br />ranges from 5 to 15 percent. <br />Initially, a temporary collection channel will be constructed <br />above (south) of the refuse pile limit at bench 1 (elevation <br />6710 feet) to provide sufficient working area. The channel <br />will have a side slope of 4H:1V on the north side and 2H:1V <br />on the south side and have an east-west slope of one percent <br />minimum. This channel will collect runoff from the pile and <br />undisturbed area north of the permanent diversion channel. <br />It is planned to convert this initial temporary collection <br />channel into a longitudinal rock underdrain when the pile <br />advances. <br />U <br />- g <br />