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Memo to Wally Erickson 3 <br />Wildcat CN -01 Access Road Geotechnical Adequacy Review <br />August 22, 2011 <br />File No. M- 1981 -185 <br />No Access Road plan or construction may be implemented without Division review and <br />approval. The Applicant must commit to submitting the new geotechnical investigation <br />information, with the revised road design if required, for Division review and approval <br />through either the Technical Revision or Amendment process prior to commencing access <br />road reconstruction activities. <br />7. In the Pre - Construction Activities section of the Work Plan the Applicant proposes to drill 6 <br />test boring and excavate 4 test pits at the approximate location shown in Attachment 6.5 -3 <br />Figure 5. Figure 5 in Attachment 6.5.3 — Geotechnical Reconnaissance Mine Access Road is a <br />photograph of the lower portion of the retaining wall and does not indicate the locations of <br />the proposed test boring and pits. Please explain this discrepancy and provide a location map <br />for the proposed borings and pits. <br />8. In the Pre - Construction Activities section of the Work Plan the Applicant states they will <br />perform an engineering and geologic evaluation for the stability of cut slopes in rock and <br />colluviums areas. The Applicant has not proposed test boring in these areas. Please explain <br />how the engineering and geologic evaluation will be completed without additional <br />information. <br />9. Please provide the proposed carrying load for the reconstructed access road and provide <br />justification in accordance with La Plata County requirements. <br />10. In the Construction Summary and Scheduling section of the Work Plan the Applicant states <br />material from the inside road cuts will be removed using a dozer. Will blasting be required to <br />remove the bedrock in the inside cut sections of the road? If so, please provide a blasting plan <br />for Division review. <br />11. In the Construction Summary and Scheduling section of the Work Plan the Applicant states to <br />stabilize the previously constructed out slope, material from the top of the fill to an area <br />approximately 20 feet (Attachment A — Sheet C3.10) from the base of the fill will be <br />sequentially removed in 10 foot or less benches to form the final slope grade. Please clarify <br />the following items pertaining to this statement: <br />a. Attachment A — Sheet 3.10 does not illustrate the out slope fill material removal <br />method. Please provide cross - sections and conceptual drawings to depict the <br />proposed fill material removal process and retaining structure construction. <br />b. Please confirm all previously placed fill material will be removed and the excavation <br />will continue until bedrock is exposed to provide a subgrade for fill placement, as <br />indicated in the Retaining Structures section of the Work Plan. <br />