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-z- <br />. All volumes in Table 1 were calculated by a block model method. <br />Attached for your review is Colowyo's computer generated block model and printout <br />of vo-~umetrics. . <br />You will note from Figure 3 that a bentonite mix was incorporated into <br />construction in certain locations. Bentonite was 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 dewatering <br />device to ensure a tight seal along the face where water v+ould likely 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 yell beyond the <br />required minimum of 90b. The face of the outs7ope of the dam was rip rapped to <br />prevent any potential flood water erosion by Geod Spring Creek. <br />The access road into the pond oras 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 />A P:,nd, p'. ease call at ;our convenience. <br />• Sincerely, <br />COLO'.~Y~O COAL COM?AtiY <br />`tom `-~ <br />Ed Moyer <br />Geologist/Reclamation Specialist <br />ETM;'yml <br />Enclosures <br />cc: R.G. Atkinson <br />J.A. Kiger <br />Central Files <br />r'1 <br />U <br />