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-2- <br />All volumes in Table 1 were calculated by a block model method. <br />Attached far your review is Colo++yo's computer generated block model and printout <br />of vo~urnetrics. <br />You will note from Figure 3 that a bentonite mix was incorporated into <br />construction in certain locations. bentonite eras added to the bottom of the key <br />cut due to intercepting wet and soft conditions at the bottom. Bentonite was <br />added along the inside face of the dam up to the elevation of the devratering <br />device to ensure a tight s=a1 along the face where vrater would li'r.ely occupy <br />volume on a frequent basis. <br />At the request of the Division, several compaction tests were run. <br />The results of the tests indicated the structure was compacted well beyond the <br />required minimum of 90X. The face of the outslope of the dam was rip rapped to <br />prevent any potential flood water erosion by Good Spring Creek. <br />The access road into the pond was constructed with gravel laid do~,an in <br />one 0.5 foot lift. "The construction traffic beat the gravel into the ground to <br />approximately ground level. In the event Good Spring Creek rises out of its <br />bank, the access road into Gulch A Pond will not impound sheet flow produced by <br />Good Spring Creek. <br />If you have any questions, or require additional information for Gulch <br />~ P,nd, please call at ;our convenience. <br />• Sincerely, <br />COLO/WYO COAL COM?A;JY <br />y <br />Ed Moyer <br />Geologist/~acizmation Specialist <br />E yml <br />E osures <br />c.. R.G. Atkinson <br />J.A. Kiger <br />Central Files <br />n <br />U <br />