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' The solution to the instability problem involves three steps. The <br />first step is removal of the offending water source. Naturally, the <br />shop area cannot be closed, backfilled and reclaimed.. However, the <br />drainage in this area can be altered to allow more rapid drainage. Some <br />seepage will still occur even with rapid drainage, but if extensive and <br />prolonged ponding on the bench can be eliminated, the amount of seepage <br />will be reduced. <br />The second step will reduce the grade of the slope. This will <br />require regrading, preferably during a dry time of the year (September <br />or October), by cutting back into the shop bench another 15 to 20 feet. <br />This will reduce the opportunity for the slope to slump when moisture <br />levels are high. <br />The third step will excavate a portion of the area where the <br />seepage is occurring. This must be done after regrading the upper <br />portions of the slope. The material excavated can then be replaced with <br />a more porous material. In effect, this will produce a kind of French <br />drain. This will remove much of the water which saturates the area and <br />initiates a flow of material which, in turn, removes the support for the <br />upper slope. <br />The combination of these three actions should result in a greatly <br />increased stability of the slope, reduction in seepage, and greater <br />opportunity for long term revegetation to become established. <br />DRAINAGE VOLUME FROM SAOP AREA: On the map ie shown an arrow in the <br />vicinity of the shop which indicates that approximately 11 cfs (5 year <br />event) of water flows from the shop area down the side of the shop elope <br />area. Actually this. volume is considerably more than 11 cfs because <br />much of the water flowing from the processing plant area, rather than <br />going down the drainage to the settling ponds, flows to and ponds on the <br />Page 3 of 6 Pikeview TR N0.6 July 1987 <br />