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<br />' It is not anticipated that any wastes other than normal residential <br />' types wastes will be disposed of in the landfill. <br />The disposal of appliances, wire and other metal objects Bind the <br />disposal of trees, timber, shrubs, and other miscellaneous items <br />t will not be permitted at this landfill site. <br />Estimated Life of the Site. As shown in Table 2, the average annual <br />volume requirements or t e Silverton/San Juan County Lanclfill are <br />relatively small, just over 1 acre-foot per year. Based on this <br />table, we have estimated that Trench 1 with a length of 4i0 feet <br />' will furnish a volume of 2.85 acre feet and will be adequate for <br />approximately 3 years. Trench 2 would provide an additional 550 <br />feet of trench with potential capacity of 3,33 acre feet, or space <br />for the next 3 years. We estimate the entire site, used F~roperly <br />' and fully exploited as shown in the Ultimate Development Flan will <br />be serviceable as a landfill until 1990. <br />Availability of Cover Material. Normally the trench method of <br />operation provides an excess of soil material that has to be wasted <br />in the vicinity of the landfill site and no additional material has <br />' to be obtained. However in this instance, we are recommending <br />filling the tailings pond to the same elevation as the access road <br />and recognize that some additional cover material may be required. <br />It is proposed to obtain this material from the tailings r•ond <br />' operation that Standard Metals is conducting '~ mile southeast of <br />the site. The material would be coarse sand and would be placed <br />on top of the landfill as the final cover. <br />' Site Pre aration. There is no site preparation required concerning <br />c Baring an grubbing, salvage of timber, or salvage and stockpiling <br />' of topsoil. No topsoil exists and, a roadway has already been <br />constructed. <br />Site preparation will consist of the work necessary to the initial <br />t development plan and will include improving the access road to <br /> service Trench 1, constructing the back up and turn around area, <br /> and performing the excavation necessary for trench 1. No fencing <br />' is proposed for the site. <br /> Excavations. The trenches will be constructed as shown on the <br /> draw-ing Trench Construction Details. Trenches will have a depth <br />' of about 8 feet, 1 to 1 side slopes, and a bottom width of about <br /> 35 feet. Trenches will be constructed from north to south. and <br /> consecutively east to west as numbered, beginning adjacent to the <br />' access road berm and being parallel to the berm. <br /> Cells will be constructed across the bottom of the trench as shown <br /> in the drawing. It is impossible to estimate sizes of cel ls due <br />' to large variations regarding quantities of wastes deliver ed, and <br /> <br />-19- <br />