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<br />• Geoloav <br />The geologic report for the site indicates "the site is underlain by rocks of the <br />Upper Cretaceous and Paleocene Raton Formation and Paleocene Poison Canyon <br />Formation." These formations consist of interbedded sandstone, shale, siltstone, and <br />coal units. <br />The spoil derived from the surface mine will be from the Raton Formation. The <br />sequence removed is estimated to be composed of 75 to 90 percent shale and 10 to 25 <br />percent sandstone. The average dip of the coal seams in the surface mine area is 1.5 <br />to 1.7 degrees to the southeast, towards the axis of a syncline located roughly through <br />Lorencito Canyon. <br />Seeps have been mapped on the site, primarily near major drainages. One small <br />seep was identified during our investigation below Fill 9 (Fig. 1). The seep is below the <br />proposed fill and sedimentation embankment location and should not affect stability. <br />~.` No other seeps were observed in or near potential fill areas. <br />Large landslides or block movements were not identified in the geological <br />assessment. Localized failures were not observed in areas of concern in our <br />investigation. <br />Toooaraohy <br />Topographic conditions in the disposal areas range from mild slopes of less than <br />10 percent, to relatively steep slopes on the order of 50 percent. Average slopes along <br />the flow line of drainages within excess spoil fill areas range from about 14 to 18 <br />percent. The valley-like shape of most disposal areas will provide confinement of the <br />fills, enhancing stability. We believe the disposal areas are located in generally <br />favorable topographic conditions to achieve stability. <br />• LORENCI70 COAL COMPANY, LLC <br />LORENCITO SURFACE MINE • PHASE I 5 <br />CTLR 3Z, 611 <br />