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Dames & Moore <br />• Flatiron Companies <br />Map 17, 1982 <br />Page 11 <br />POST-MINING TOPOGRAPHY <br />Current plans indicate that the East Dump contours will be very similar <br />to the natural contours in the region and specifically similar to the more <br />gently sloping terrain of the area surrounding the dump site. The maximum <br />post-mining slope will be 1 vertical to 5 horizontal with most slopes being <br />flatter. There will be no depressions or drainage impoundments in the fill <br />area. The general land form of the East Dump will be that of a rounded mound <br />some 200 yards northeast of where a natural rounded mound stood before mining. <br />ERCESS SPOIL <br />We understand that Flatiron's current calculations indicate a balance <br />between excavation, East Dump construction and mine baclcfilling. As more <br />• specific data are gathered on actual swell factors and volume of coal mined, <br />final contours of both the East Dump and the backfilled mine area will be <br />appropriately adjusted. <br />SITZII9ARY OF IMPACTS <br />In summary, the hydrologic impacts of the East Dump will consist of a <br />small reduction in runoff and a minor increase in ground-water recharge <br />compared with conditions which existed prior to dump placement. The presence <br />of the East Dump is expected to have negligible impact upon surface water or <br />ground-water flow volume or quality outside the property limits. <br />The geotechnical impacts of the East Dump will be negligible. The fill <br />procedures are producing fill densities and strengths such that stability <br />will be satisfactory. Excess spoil material will be used in construction of <br />the East (Jump. Post mining topography will be very similar to premising <br />• topography. <br />