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0 O ~ ~ IG\ o O O J iii iiiiiiiiiiiii iii For J. A. Kiger May 1, 1995 WEST PIT EXCESS SPOIL FILL CONSTRUCTION UPDATE AND CERTIFICATION REVISED MAY 1, 1995 On March 30, 1995, I inspected the area in which the West Pit Excess Spoil Fill is being constructed. The purpose of this inspection was to observe the on-going construction of the surface rock drain that borders the 3:1 Excess Fill Slope, inspect the fill for areas of water seepage or surface drainage, inspect the final grade slopes between the 7050 and the 7150 elevation of the Excess Fill Slope, and to satisfy the requirements of CDMG Rule 4.09.1(lla). During the inspection it was observed that the surface rock drain bordering the Excess Spoil Fill 3:1 slope had been completed from the 7025 elevation to the 7050 elevation, the Excess Spoil Fill had been final sloped from the 7050 elevation to the 7100 elevation, and that construction of the two percent ditch that runs across the face of the fill at the 7050 elevation was nearly complete. At the toe of the fill approximately 6 gallons per minute of water was running from underneath the fill. This water is a combination of the surface drain and fill underdrain. It was impossible to tell individually the amount coming from either source. I am a mining engineer, registered in the State of Colorado, and experienced in the construction of rock and earthen projects for the purposes of mining activities. To the best of my knowledge, based on my professional expertise the West Pit Excess Spoil Fill has thus far been constructed in conformance with the prudent state-of-the-art methodology for earth and rock fill construction, as specified in pages Ia-2 through Ia-4, Exhibit 19Ib, and other applicable requirements of the approved permit documents, a portion of CDMG Permit C-81-019. tephen R. Hinkemeye4~ do Registered P.E. 25436 ~'~ R.~ I l r~ /,