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~ ~ °° o Q Q O MEMORANDUM For J. A. Kiger May 1, 1995 WEST PIT EXCESS SPOIL FILL CONSTRVCTION UPDATE AND CERTIFICATION REVISED MAY 1, 1995 During the quarter beginning January 1, 1995 and ending March 31, 1995, I inspected the area in which the West Pit Excess Spoil Fill is being constructed. The purpose of these inspections was to observe the area in which a small spoil slide was removed, seepage discovered, a rock drain established with a filter Iayer and later filled back in; inspect the on-going construction of the rock surface drain; inspect the areas currently being dumped complete by the truck/shovel fleet and final sloped using dozers; inspect the fill for areas of water seepage or surface drainage and to satisfy the requirements of CDMG Rule 4.09.1(lla) During the inspections it was observed that the Excess Spoil Fill Area was dumped in and sloped from the 7050 elevation to the 7100 contour elevation; the two percent, 25 foot wide catch bench ditch at the 7050 elevation was nearly complete; the surface rock drain down the three-to-one slope was complete from the 7025 elevation to the 7050 elevation, and the truck dump had advanced to the point that the 7150 contour was nearly dumped in. 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. January 3, 1995 - begin construction of the three-to- one surface drain beginning at the toe of the fill and working upward in elevation along the north east side of the three-to-one West Pit Excess Fill Area face. March 30, 1995 - quarterly inspection of the West Pit Excess Spoil Fill On January 3, 1995 the construction of the surface rock drain that runs along the north east edge of the Excess Spoil Fill had advanced to the 7050 elevation. (see photographs 69 through 71)