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' //~ Kennecott <br />~ .Energy Memorandum <br />• ColowyoCoalCompanyL.P. ~; <br />FOR: Steve Hinkmeyer <br />West Pit Fill InsRection Certification <br />April 14, 1999 <br />On March 25, 1999, I inspected the area designated as the West Pit Excess Spoil Fill. The purpose of this <br />inspection was to determine if there were any hazazds to the stability of the Excess Spoi] Fill. I inspected <br />the Surface Rock Drain bordering the 3:1 slope on the East and North Sides, the 3:1 slope itself ,the <br />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 functioning as expected. During the Quarter approximately 800,000 <br />CY of material was placed in the excess spoil fill. This material was placed on the 7375, 7425, and 7450 <br />dumps which will later require reclamation grade backfill on the outslopes and final grading td a 3:1 <br />• slope. <br />As noted above the Under Drain was running approximately 5 gpm, in addition a small seep <lgpm 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 Ivlining 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 Ia-4, Exhibit 19Ib, and other applicable <br />requirements of Permit C-81-019 as submitted to the Colorado Division of Minerals and Geology. <br />an Keith Briggs <br />Colorado Registered Profession Engineer # 31956 <br />File: J:\m isCl\Jms.~. pins 199.wpJ <br />