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Kathy Welt <br />March 27, 2012 <br />Page 3 <br />seepage area) was installed in a shallow trench along the upslope (south) edge of the drainage blanket <br />adjacent to the bedrock face. This pipe was sloped downward to the east until it reached the 12" <br />HDPE (solid wall) coming down from the upper interceptor trench further east. These pipes then <br />extended parallel to each other down the hillside to discharge into the main sediment outlet ditch as <br />shown in Figure F -4. <br />Construction Observation <br />Representatives from Barr and a subconsultant (Rock Logic Consulting) were present on a part -time <br />basis to observe the removal of material and the construction of the design elements described above <br />as the work progressed. Nuclear moisture- density testing was performed by Lambert & Associates <br />periodically during construction activities. <br />It is Barr's opinion that the construction activities and quality control measures performed as part of <br />the project are in general accordance with the recommendations provided by Barr to West Elk Mine <br />personnel. <br />Surface Stabilization and Slope Monitoring <br />Final stabilization of graded surfaces and ditches through establishment of vegetation and placement <br />of riprap will be completed in the spring of 2012. Slope monitoring will be conducted in the vicinity <br />of the haul road slide area through placement of survey mirrors and by conducting at least monthly <br />field observations, particularly during the spring thaw and early summer when soils are typically <br />more saturated. Additional monitoring or corrective action will be conducted if slope movement is <br />observed in the future. <br />Please contact us with any questions. <br />Sincerely, <br />Paul T. Swenson, P.E. <br />Vice President <br />Attachment <br />P:AMplsA06 CO \26 \06261003 Haul Road Slide RepairAWorkFiles\Report \MCC Slump Repair Letter 2012- 03- 27.docx <br />