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' In early 1987 the slope south of the shop xae regraded and seeded, <br />in accordance with the Drainage and Grading Plan (April 10, 1985 <br />submittal). Almost immediately, the east end of the slope, which was <br />somewhat steeper than actually desired, began to slump. The slumping <br />has slowed considerably and seems to be showing some degree of <br />stabilization. Hoxever, the slope slumping and other related aspects <br />means this area x111 need to have corrective action applied. <br />SLOPE STABILITY AND SLUhIPING: The slope stability problem is present <br />on only a part of the east end of the slope south of the shop. The <br />precise cause of the instability is still unclear. The remainder of the <br />slope is stable and has shown no evidence of cracking or slumping. <br />It is known that water tends to seep from the base of the hillside <br />in this area and this saturates the limestone waste. Once saturated the <br />material tends to flow and ooze. This movement undoubtedly alters the <br />support of the material uphill and slumping occurs. <br />The source of the water is not known, but probably it is seepage <br />derived from the bench the shop rests on. Old photographs of the area <br />do not show a vegetation which is unusually rich at this location. If <br />the growth was more lush, it would clearly indicate a groundwater <br />seepage at this location. It appears, at this time, the water is <br />derived from seepage along the interface between the original eteeplp <br />sloping surface and the limestone waste resting on top of it. If the <br />source of the water is removed bq draining the shop bench area more <br />completely, then greater stability should be achieved. <br />It appears the slope above the seepage area is somewhat steeper <br />than was originally planned. By reducing this slope, the opportunity <br />for slumping would be reduced, even if some seepage still occurred. <br /> <br />Page 2 of 6 Pikeview TR N0.6 July 1987 <br />