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May 29, 2009 <br />Page 28 <br />durable rock spoil is placed in single or multiple lifts such that the underdrain <br />system is constructed simultaneously with excess spoil placement by natural <br />segregation of dumped materials, photographs shall be taken of the underdrain <br />as the underdrain system is being formed. The color photographs accompanying <br />each certified report shall be taken in adequate size and number with enough <br />terrain or other physical features of the site shown to provide a relative scale to <br />the photographs and to specifically and clearly identify the site. <br />Any conditions noted that would warrant modifications to the design will be documented <br />and analyzed in a timely fashion. <br />Once the Horse Gulch fill is completed and contoured to the design grade there will be no <br />need to channel storm runoff away from the fill. The final design elevation extends above the <br />historic drainages thus directing storm water away from the Horse Gulch fill. The only erosion <br />protection required will be contour ditches on the face of the fill and lining the contact between <br />the downstream face of the fill and the natural ground. The contour ditches will collect sheet <br />flow on the face of the fill and direct it to the rock lined ditches at the limits of the fill. During <br />the placement of the fill, temporary contour ditches and silt control measures may need to be <br />constructed to maintain storm water runoff quality and prevent erosion; recommendation for <br />these structures will be made based on field conditions. <br />5.0 REFERENCES <br />Agapito Associates, Inc. (2008), "Cost Estimate for Performing Analyses of Multiple <br />Geotechnical Tasks" submitted to Trapper Mining, Inc., June 26. <br />Agapito Associate, Inc. (2006), "Trapper Mining Inc.-Rock Mechanics Core Testing Results," <br />prepared for Trapper Mining, Inc., February 6. <br />Douglass, Peter M. and Michael J. Bailey, (1983), "Evaluation of Surface Coal Mine Spoil Pile <br />Failures," Third International Conference on Stability in Surface Mining, Volume 3. <br />Capstone Enterprises West, LLC (2008) "Geologic Review and Soils Engineering Report <br />Trapper Coal Craig, Colorado" Prepared for Agapito Associates, Inc., June 4, 2008. <br />Colorado Division of Minerals and Geology (1980), "Regulations of the Colorado Mined Land <br />Reclamation Board for Coal Mining," effective August 30, page 305, Section 4.09.1. <br />Itasca Consulting Group (2005), "Fast Lagrangian Analysis of Continua in 3 Dimensions, <br />FLAC31) Version 3.0, User's Guide," Minneapolis, Minnesota. <br />Trapper Mining, Inc. (2005), (No Name), AutoCAD file of borehole contours for each major <br />stratigraphic layer, [Borehole-contours.dwg]. <br />Agapito Associates, Inc.