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<br />//~ Kennecott <br />~ . Energy ~__ <br />Coloa-goCoelconr~onyt~P. `~: <br />FOR: Jim Kiger <br />West Pit Fill Infection Certification <br />July 16, 1998 <br />On June 30, 1998, I inspected the area in which the West Pit Excess Spoil Fill <br />is being constructed. The purpose of this inspection was to observe the <br />surface rock drain that borders the 3:1 Excess Fill Slope, inspect the areas <br />dumped to final grade on the 7200, 7250 and 7275 dump areas; inspect the re- <br />vegetation on the fill surface and to inspect the fill for areas of water <br />seepage or surface drainage; inspect the surface rock drain on the east side <br />of the fill, inspect the final grade slopes below the 7300 elevation of the <br />Excess Fill Slope, and to satisfy the requirements of CNIDG.. Rule 4.09.1(lla). <br />During the inspection it was observed that the condition of the fill was <br />good, no seeps or springs were noted. The collection ditches at the 6950, <br />7050 and 7150 elevations all were in relatively good shape. The collection <br />ditch on the 7250 elevation has been completed on the East half of the fill, <br />however, the west half of the fill at that elevation has not yet been <br />completed. At the toe of the fill 1-2 gallons per minute was running from <br />underneath the fill, 1 gallon per minute from under the toe of hillside drain, <br />3-4 gallons per minute of water was running from the west hillside drain and <br />no runoff was observed in the surface drain. <br />I am a mining engineer, registered in the State of Colorado, and <br />experienced in the construction of rock and earthen projects for the purposes <br />of mining activities. <br />To the best of my knowledge, based on my professional expertise the West <br />Pit Excess Spoil Fill has thus far been constructed in conformance with the <br />prudent state-of-the-art methodology for earth and rock fill construction, as <br />specified in pages Ia-2 through Ia-4, Exhibit 19Ib, and other applicable <br />requirements of the approved permit documents, a portion of ChIDG. Permit C-81- <br />019. -........... <br />•s~ .Stephen R. Hinkemfyer <br />25436c~~sao Registered P.E. 25436 <br />iiiiiiiiiiiiiiuiii <br />Memorandum <br />Date <br />