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Susan Burgmaier -3- May 2,2013 <br />As shown in the table, both the Topsoil and the Coverfill material fall into the "Good" suitability <br />criteria, or "Fair" in the case of Texture Class. So while the properties of the two materials are <br />not numerically equal, according the established criteria for topsoil suitability, they are <br />considered equal. <br />5. DRMS: Given the deficiency in the available topsoil to be salvaged in the Gob Pile #2 <br />expansion area, the depth of coverfill and topsoil replacement will need to be revised in the <br />Reclamation section of Volume IX of the permit. Please update the topsoil replacement <br />discussion in the reclamation plan section beginning on page 14 of Volume IX Also, please <br />update the material balance worksheet submitted in Appendix A of Volume IX. <br />BOW -2: Please see revised Volume IX pages 14 -19 Appendix A. In addition, DRMS requested <br />after the completion of TR -76 that Bowie add a figure to correspond to the detailed design <br />information shown on page 4, so please see new page 4i. Page 7 was updated to incorporate <br />more up to date information including referencing the topsoil variance approved with TR -76. <br />The salvage volume shown on Appendix A was left the same, with a note added to indicate <br />values calculated are estimated. The reclamation volumes are calculated to match the volumes <br />actually in place at the topsoil stockpiles. <br />1998 Revegetation <br />I <br />Guide for Colorado <br />Suitability Criteria* <br />PH Topsoil <br />pH Coverfill I <br />"Good" <br />Average <br />7.54 <br />8.30 I <br />i <br />6.0 -8.4 <br />i <br />Suitability Criteria* <br />EC Topsoil <br />EC Coverfill <br />"Good" <br />Average <br />0.91 <br />2.17 I <br />i <br />0 -4 <br />i <br />I <br />Suitability Criteria* <br />Texture Topsoil <br />Texture Coverfill I <br />Average <br />Silty -Clay -Loam <br />Clay -Loam i <br />"Fair" <br />i <br />I <br />Suitability Criteria* <br />SAR Topsoil <br />SAR Coverfill i <br />"Good" <br />Average <br />4.83 <br />2.36 I <br /><6.0 <br />------------------------------------1------------------ <br />i <br />* Suitability Criteria taken from "Native Plant Revegetation Guide for Colorado" <br />As shown in the table, both the Topsoil and the Coverfill material fall into the "Good" suitability <br />criteria, or "Fair" in the case of Texture Class. So while the properties of the two materials are <br />not numerically equal, according the established criteria for topsoil suitability, they are <br />considered equal. <br />5. DRMS: Given the deficiency in the available topsoil to be salvaged in the Gob Pile #2 <br />expansion area, the depth of coverfill and topsoil replacement will need to be revised in the <br />Reclamation section of Volume IX of the permit. Please update the topsoil replacement <br />discussion in the reclamation plan section beginning on page 14 of Volume IX Also, please <br />update the material balance worksheet submitted in Appendix A of Volume IX. <br />BOW -2: Please see revised Volume IX pages 14 -19 Appendix A. In addition, DRMS requested <br />after the completion of TR -76 that Bowie add a figure to correspond to the detailed design <br />information shown on page 4, so please see new page 4i. Page 7 was updated to incorporate <br />more up to date information including referencing the topsoil variance approved with TR -76. <br />The salvage volume shown on Appendix A was left the same, with a note added to indicate <br />values calculated are estimated. The reclamation volumes are calculated to match the volumes <br />actually in place at the topsoil stockpiles. <br />