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0 <br />Q <br />Z <br />0 <br />N <br />V <br />O <br />N <br />4 FOOT LAYER OF NON-TOXIC, NON-COMBUSTIBLE <br />MATERIAL AND TOPSOIL <br />DAYLIGHT DRAIN, PROVIDE <br />POSITIVE DRAINAGE ON <br />BENCH (2 PERCENT MIN.) <br />TO EAST DRAIN. <br />BENCH 3 <br />DRAIN SHOULD BE CONSTRUCTED BY EXCAVATING <br />INTO THE COAL REFUSE AND PLACING MIRAFI 140 <br />OR EQUIVALENT FILTER FABRIC, APPROXIMATELY <br />1 F00T OF 1/2 TO 1 1/2 INCH CLEAN, WASHED GRAVEL <br />AND ANOTHER LAYER OF FILTER FABRIC PRIOR <br />TO RE-ESTABLISHING COVER. EXCAVATION AND DRAIN <br />LAYER SHOULD EXTEND LATERALLY ABOUT 2 TO 3 <br />FEET BEYOND THE OUTLINE OF THE SLUMP. <br />NOT-TO-SCALE <br />COAL REFUSE <br /> <br />.r~ <br />