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0 o v v ( O iiiiiuiiiiiiiiiiii For J. A. Kiger October 7, 1994 WEST PIT EXCESS SPOIL FILL CONSTRUCTION UPDATE AND CERTIFICATION During the quarter beginning July 1, 1994 and ending October 1, 1994, I inspected the area in which the West Pit Excess Spoil Fill is being constructed. The purpose of these inspections was to observe the on-going construction of the rock drain, inspect the area from which the clay material was removed, inspect the fill for areas of water seepage or surface drainage, inspect the toe filter layer and to satisfy the requirements of CDMG Rule 4.09.1(lla). During the inspections it was observed that all the clay materials have been removed from the bottom of the drainage area between stations 0-30 to 20+50 of the West Pit Excess Spoil Fill, the rock drain had been successfully completed from stations 0-30 to 9+00 of the West Pit Excess Spoil Fill and the toe filter layer is complete from stations 0-30 to 2+00. Two small slide areas were discovered, one above the elevation of the rock drain in the area of stations 1+50 to 2+50 and the other at the elevation of clay removal in the area of stations 2+50 to 4+00. During the quarter several other notable events have occurred in the Excess Spoil Fill Area. The following dates reference the major events that have occurred during the quarter. July 6, 1994 -begin removing clays from the rock drain area of the West Pit Excess Fill July 11, 1994 - begin excavation of the buttress fill at the toe of the West Pit Excess Fill July 13, 1994 - finish excavation of the buttress fill at the toe of the West Pit Excess Fill July 14, 1994 - begin backfill and compaction of the buttress fill at the toe of the West Pit Excess Fill July 15, 1994 - complete backfill and compaction of the buttress fill at the toe of the West Pit Excess Fill August 10, 1994 - begin placing rocks in the west Pit Excess Fill Area at station 3+50 and push them to Station 0-30, 30 feet beyond the toe of the fill