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<br />TOPSOIL STOCKPILE # 2 <br />Topsoil Stockpile 112 will be used to store any future topsoil <br />to be stripped from the site. A plan view of the stockpile <br />is shown on Map 1112. <br />The contours shown for the stockpile on Exhibit A are for maximum storage, <br />which has been determined from the cross-sections using the average end <br />area method. Maximum storage capacity is approximately 15,000 cubic yards. <br />Depending upon how much topsoil is available from the refuse area, this <br />capacity may never be reached. <br />Average depth of the stockpile is 12 feet, although it exceeds 20 feet in <br />the area where the original drainage channel is located. <br />The following measures will be taken to properly handle disturbed and un- <br />disturbed drainage and to minimize erosion: <br />(1) Sideslopes of the stockpile will not exceed 4.OH:1.OV <br />(2) Hay will be used to minimize erasion of the stockpile surface <br />(3) Sediment collection ditches of approximately one foot in depth <br />will be installed to collect runoff on either side of the <br />stockpile. These ditches will lead to a sediment sump to be <br />excavated at the toe of the stockpile, similar to the one for <br />the existing stockpile. <br />(4) A diversion ditch will be installed around the entire stock- <br />pile, as shown on Exhibit M . The existing diversion above the <br />substation will be partially relocated as shown on the exhibit <br />and berms will be installed to protect the integrity of the <br />diversion between the topsoil stockpile and the substation pad <br />area. The diversion ditch will be approximately 1.2 feet deep <br />with 2.OH:1.OV sides lopes. <br />C <br />457 <br />