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Barr Engineering Company <br />4700 West 77th Street • Minneapolis, MN 55435-4803 <br />Phone: 952-832-2600 • Fax: 952-832-2601 • www.barr.COM An EEO Employer <br />SARR <br />Minneapolis, MN • Hibbing, MN • Duluth, MN • Ann Arbor, MI • Jefferson City, MO <br />Memorandum <br />To: Chris Nyikos and Kathy Welt <br />From: Paul Swenson, Jed Greenwood, Brad Dunn <br />Subject: Proposed Geotechnical Investigation in East RPE Area <br />Date: May 5, 2009 <br />Project: East RPE Area <br />Mountain Coal Company (MCC) plans to drill approximately eight boreholes with two <br />optional locations within or near the preliminary footprint of a proposed East RPE area. <br />Figure I (attached) shows proposed locations of the boreholes. The geotechnical <br />investigation plan is divided into five groups consisting of: <br />String Borehole Approx. Elevation Fftl <br />First Group B 1, B 10 (Optional) 6,190 <br />Second Group B2 6,320 <br />Third Group B3, B4 6,380 <br />Fourth Group B5, B6 6,570 <br />Fifth Group B7, B8, B9 (Optional) 6,800 <br />The expected stratigraphy below the preliminary footprint of the proposed East RPE area <br />and general borehole information is as follows: <br />Thin layer of topsoil, with alluvial deposits at the bottom of the draw from <br />seasonal runoff being concentrated in this area. Sand, gravel and sizable boulders <br />are expected along the bottom of the draw. <br />• 10 to 30 feet of colluvium underneath organic soils and alluvial deposits. <br />Borehole logs and field mapping will confirm this. <br />• Interbedded sandstone, siltstone, and shale of the Upper Coal Member of the <br />Mesaverde Formation underlying the colluvium. The corehole logs will confirm <br />the thickness and limited stratigraphy. <br />H:\ENV PERMITTING\REVISIONS-MINOR\MR-354\East_RPE_Area_Boring Memo VI.doc