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eh <br />ESPEY, HUSTON & ASSOCIATES, INC. <br />u <br />The outslopes of the embankment will be shaped to three horizontal to <br />one vertical (see Fig. 13.3.7). Those sections of the slope which will not support <br />vegetation naturally will be covered with topsoil to allow vegetation. (30 CFR <br />817.162(d)(13)). <br />13.4.1.5 Sediment Pond Collector Ditches <br />Sediment Pond collector ditches will be constructed prior to removal of <br />any topsoil from the refuse disposal area. These ditches will be cut to a minimum <br />depth of three feet with side slopes of three horizontal to one vertical. Excavated <br />material will be placed on the low side and compacted by several passes of the <br />dozer. Material not required to raise the low side to the minimum depth will be <br />used for roadway embankment construction, if suitable, or placed in the disposal <br />area and handled as refuse. The minimum slope of the flowline of the sediment pond <br />collector ditches is 1%. Those parts of the banks of these ditches that will not <br />• support vegetation will be coveted with topsoil to allow vegetation. These ditches <br />need to be constructed in a sequence that allows the entire refuse area and soil <br />stockpile area to be drained as soon as any azea comes into service. As the topsail <br />stripping operation proceeds ahead of waste placement the collector ditches will be <br />extended accordingly. Similarly, as the topsoil storage proceeds uphill the collector <br />ditches associated with it will be extended. Three culverts consisting of two <br />parallel 24-inch CSP pipes will be placed as shown on Fig. 13.1.4 to allow access to <br />the topsoil stockpile and disposal azeas (see detail, Fig. 13.3.5). <br />13.4.2 Placement of the Waste <br />The waste material will be brought to the site from the mine in end <br />dump haulers. If less than 2 0% by volume of the waste does not meet the <br />requirements of 30 CFR 715.15 (d) and 817.74 then the material will be placed in <br />large lifts and not compacted. If the volume of non-eligible material exceeds 20% <br />then it will be placed in lifts not to exceed three feet compacted thickness and <br />• <br />13-15 <br />