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Gary Isaac <br />CAM-Colorado, LLC <br />August 29, 2008 Page 4 <br />2.04.5 General Description of Geology and Hydrology <br />8. Map 05 Surficial Geology and Geologic Hazards does not cover the entire permit area. <br />In accordance with 2.04.5, each application shall contain a description and map of all <br />lands within the proposed permit area, adjacent areas and the general area. Please update <br />Map 05 or prepare a separate map showing the geology of the entire permit area. <br />Rule 2.04.6 Geology Dcs?:.fiption <br />9. The Geology Map and the Geologic Cross-Section Maps 5 and 8, respectively should be <br />described in text and referenced under Section 2.04.6. Please add a discussion and <br />reference to these maps in Section 2.04.6. <br />10. In accordance with Rule 2.04.6(3) (a) (ii), please add the coal crop lines and the strike <br />and dip of the coal to be mined to Map 05 Surficial Geology and Geologic Hazards or to <br />another appropriate Geology Map. <br />11. On Map 8 Cross Section A-A' there is a cross section rock unit that is shaded in lighter <br />yellow that is not identified in the legend. Also there is no horizontal or vertical scale <br />provided and the total depth of the exploration holes is not given. Please add all of this <br />information to Map 8. <br />12. It would be helpful to include a generalized stratigraphic column of the project area <br />showing the geologic group and the formations above and below the coal seams to be <br />mined. Please add a generalized columnar section and reference it in the text under <br />Section 2.04.6. <br />13. An Engineering Geologic Evaluation Report (Volume III Tab 8) and a Preliminary <br />Geotechnical Study (Volume V) were prepared for the site by Vector Colorado, LLC and <br />these are referenced on page 2.04-14 under Section 2.04.6 Geology Description. Map 05 <br />Surficial Geology & Geologic Hazards should also be referenced and described in <br />Section 2.04.6. Map 05 specifically shows the unit train loadout and loop track area to be <br />in an "Area of Rapid or Accelerated Erosion". There is strong evidence in these areas for <br />rapid erosion and slope wash. In both the Engineering Geologic Evaluation and the <br />Preliminary Geotechnical Study it is stated by Vector that site-specific engineering <br />designs and mitigation measures will need to be developed. There are also "Potentially <br />Unstable Slopes" identified in the portal area and along portions of the access road and <br />conveyor. These are areas representing rockfall hazards and areas susceptible to <br />landsliding if existing conditions are modified through construction activities. For these <br />areas, rock slope stabilization and project oversight by an engineering firm qualified in <br />geotechnical engineering design is recommended.