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//~ Kennecott <br />~ .Energy _,J ._ Memorandum <br />CofowyoCoalConrpalyL.P ' <br />FOR: Steve Hinkemeyer <br />West Pit Fill Inspection Certification <br />October 7, 1999 <br />On September 23,1999, I inspected the area designated as the West Pit Excess Spoil Fill. The purpose of <br />this inspection was to determine if there were any hazards to the stability of the Excess Spoil Fill. [ <br />inspected the Surface Rock Drain bordering the 3:1 slope on the East and North Sides, the 3:1 slope itself , <br />the vegetative efforts on the fill surface, and the contour ditches which run across the fill. This inspection <br />meets the requirements of CMDG Rule 4.09.1 (lla). <br />During the inspection the surface rock drain seemed stable and no springs or seeps were noted except at <br />the toe of the slope where the designed Under Drain surfaces into the West Pit Pond. The collection <br />ditches at the approximate elevations of 6950 and 7150 were stable and functioning as designed. The re- <br />established 7050 contour ditch was vegetated and functioning as expected. During the Quarter <br />approximately 1,200,000 LCY of material was placed in the excess spoil fill. This material was placed on <br />the 7375, 7425, and 7450 dumps and included approximately 50,000 LCY of reclamation grade backfill <br />on the outslopes. Final grading, topsoiling and seeding is still requved to finalize these dumps however <br />some topsoiling and grading had been completed prior to my inspection. <br />During the quarter the West Pit Excess Spoil Fill expansion, as submitted to the CDMG, was used for <br />dump room. This expansion was constructed as designed and took approximately 500,000 LCY to fiB <br />expansion. <br />As noted above the Under Drain was running approximately 5 gpm, in addition a small seep <Igpm was <br />examined from the designed West Hillside Drain. No other conditions were noted that may present a <br />hazard to the West Pit Excess Spoil Fill. <br />I am a Mining Engineer, registered in the State of Colorado, and am experienced in the construction of <br />rock or earthen fills for the purpose of mining activities. <br />To the best of my knowledge, based on my professional expertise, the West Pit Excess Spoil Fill appears <br />stable and constructed according to pages Ia-2 through Ia11, Exhibit 19Ib, and other applicable <br />requvements of Permit C-81-019 as submitted to the Colorado Division of Minerals and Geology. <br />Brian ith Briggs RF S, <br />Colorado Registered Profession Engineer # 31956 ~~OTii~~.F~ <br />File: d:\miscl\dmglwpins299.wpd <br />11956 <br />~ 1.99 <br />