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• reused during reclamation. Topsoil is defined as that material <br />having a significant organic content which will readily support <br />vegetation. <br />Once site preparation (clearing, grubbing and stripping) is <br />completed, the foundation area should be graded such that all <br />areas slope towards the location of the rock drain. A minimum of <br />0.5 percent slope should be maintained in all graded areas. <br />The rock drain is to be installed at the location and to the <br />limits shown on figure 1 and to the details shown on Figure 6, <br />following site preparation and grading. The rock used in the <br />drain should be hard, durable sandstone cobbles, or equivalent. <br />• The rock drain should also be wrapped in Typar 3401 filter cloth, <br />or equivalent with a minimum 2-foot overlap. The drain should <br />be installed in a trench excavated into the foundation soils as <br />shown on Figure 6 and constructed according to the following <br />recommended procedure. <br />s A 2-foot deep trench 10 foot wide at the top should be <br />excavated into the foundation soils. <br />~ The drain should slope continuously with a positive <br />gradient of at least 2 percent to avoid development of <br />flat or depressed areas where fines could settle and <br />plug the drain. <br />e The filter cloth should then be placed in the trench in <br />two sections with a 2-foot overlap in the bottom of the <br />trench with the cloth running length wise parallel to <br />the trench. <br />• The drain rock should be end dumped into the trench to <br />a minimum depth of 2-feet above the ground surface. <br />Rock should be end dumped in such a way as to minimize <br />grading of the rock. <br />11 <br />