Laserfiche WebLink
,: Q ~ ~ <br />v <br />Q O <br />MEMORANDUM <br />For J. A. Kiger January 9, 1995 <br />WEST PIT EXCESS SPOIL FILL CONSTRIICTION IIPDATE AND CERTIFICATION <br />During the quarter beginning October 1, 1994 and ending <br />December 31, 1994, I inspected the area`in which the West Pit <br />Excess Spoil Fill is being constructed. The purpose of these <br />inspections was to observe the on-going construction and the <br />completion of the rock underdrain; inspect the area in which a <br />small spoil slide was removed, seepage discovered, a rock drain <br />established with a filter layer and later filled back in; inspect <br />the on-going construction of the rock surface drain; inspect the <br />areas currently being dumped complete by the truck/shovel fleet and <br />final sloped using dozers; inspect the fill for areas of water <br />seepage or surface drainage and to satisfy the requirements of CDMG <br />Rule 4.09.1(lla). <br />During the inspections it was observed that the slide <br />previously reported near stations 1+50 to 2+50 was excavated, <br />seepage discovered, a rock drain with a filter rock layer was built <br />to drain the seepage and the area filled back in; the Excess Spoil <br />Fill Area was dumped in and sloped from the 6859 elevation (toe <br />elevation) to the 7050 contour elevation; the two percent, 25 foot <br />wide catch bench ditch at the 6950 elevation was complete; the <br />surface rock drain down the three-to-one slope was complete from <br />the 6859 elevation (toe elevation) to the 7025 elevation, During <br />the quarter several other notable events have occurred in the <br />Excess Spoil Fill Area. The following dates reference the major <br />events that have occurred during the quarter. <br />October 5, 1994 - finish excavating and draining the <br />slide area between stations 1+50 and <br />2+50 of the West Pit Excess Fill Area <br />underdrain <br />November 10, 1994 - begin construction of the three-to- <br />one surface drain beginning at the toe <br />of the fill and working upward in <br />elevation along the north east side of <br />the three-to-one West Pit Excess Fill <br />Area face. <br />December 2, 1994 - finish West Pit Excess Fill Area <br />rock underdrain from stations 1+50 to <br />2+50 <br />