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0 <br />• CONSTRUCTION RECOMMENDATIONS <br />We recommend the portal areas be reclaimed by placing and compacting the <br />excavated material using conventional earthmoving operations. We recommend <br />compaction to at least 90 percent of standard Proctor maximum dry density. The <br />moisture content of the material is not considered critical, sufficient moisture should <br />be available to achieve compaction. It would be preferable to place the backfill <br />material at or below optimum moisture content to reduce settlement and increase the <br />strength of the compacted material. The material can be compacted using wheel- <br />rolling with heavy equipment orself-propelled compactors. Depending upon the type <br />of equipment utilized, we believe compaction should be applied to layers on the <br />order of 8 to 12 inches in thickness. As material is placed and compacted against the <br />back cut slope, small benches on the order of 1 to 2 feet should be cut into the back <br />slope to key the fill into the native soils and bedrock. <br />• LIMITATIONS <br />The analyses and conclusions presented in this report are for the conditions <br />described in the report. Variations in conditions are always possible. We believe this <br />study was performed using methods and procedures consistent with other <br />professionals practicing geotechnical engineering in this area at this time. No other <br />warranty, express or implied, is made. <br />It has been our pleasure to serve you on this project. If we can clarify our <br />opinions or be of further service in discussing the contents of this report, please call. <br />• <br />(See following page for additional signatures) <br />9 <br />LORENCITO COAL COMPANY, LLC <br />CTL/T 25,863 <br />