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lltn, 9. _ 001) <br />Extent of K-Pit Buttress <br />U 1000 <br />?rJ <br />Scale (n) <br />534-21 Trapper Munn, 1534 21 2 Trapper K-Pit Sequence Owg Layout Fg 291 mwclsmvl (5 2920091 <br />figure 29. B-Block Spoils 1lovement <br />Pt!g ' 5 <br />i <br />L-Pt] Limits <br />During AAi's Fall 2008 site visits to the Ilorse Gulch there were no expressions of <br />surface water or near-surface oroundwater. The Subgrade was generally firm to hard, one soft <br />spot was observed in a depression caused by rainwater ponding along a scraper haul route. <br />Potential ponding features shall be eliminated either by cutting the da,?•nstream slope to promote <br />flow, or by tilling in the depression and then compacting it to the same degree as the surrounding <br />area. This method of channel enhancement may also be used to consolidate relatively close <br />indl\ ideal channels. <br />Care should be taken to minimize the Cut depth in order to maintain good drainage <br />throughout the entire length without being too deep at the exit of the drain. FiOure 30 shows the <br />area near the exit of' the drain. It is very likely that the trench will intersect the massive <br />sandstone laver. The deeper the trench is at this point, the longer the intercept with the sandstone <br />%vill be. This sandstone layer IS most likely the cause of the wet area in the base of I lorse Gulch. <br />The minimal flow of runoff is trapped by the impermeable sandstone. This area may require <br />Agapito Associates, Inc.