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To: Jared Ebert <br /> Date: January 2, 2018 <br /> Page 30 <br /> h. The material properties for each of the soil materials used in the stability analysis <br /> were based on field testing. No laboratory soil parameter were conducted by <br /> Telesto. <br /> i. Material properties for the weathered and competent claystone bedrock were not <br /> deemed necessary and were not conducted by Telesto. <br /> Response 51 <br /> The above information is correct with the following clarifications: <br /> c. The clay loam was observed to be up to six feet in thickness, but is commonly <br /> within the range of two to five feet thick. The maximum thickness of the sand <br /> and gravel within the borings referenced for this geotechnical report is 24 ft. This <br /> change has been made within the Exhibit S report. <br /> e. To be clear, the 50-foot offset from a permanent man-made structure is measured <br /> from the edge of the structure to the crest of the highwall. <br /> h. Telesto did utilize laboratory soil tests, including grain-size distribution, dry <br /> density, moisture content, and Atterberg Limits test results from samples procured <br /> from the borings advanced on-site. This characterization, combined with standard <br /> penetration testing during drilling, allowed establishment of conservative strength <br /> parameters for the materials. However, no shear or triaxial tests were deemed <br /> necessary. The Geotechnical Stability Analysis report has been updated as <br /> necessary to clarify this issue. <br /> The revised Geotechnical Stability Analysis is resubmitted as Attachment 7 for DRMS <br /> review. <br /> Comment 52 <br /> The Applicant states a minimum fifty (50) foot offset will be maintained at all times <br /> between the highwall crest and the structure to be safeguarded, however the stability <br /> analysis were modeled with a thirty (30)foot offset from the crest of the Little Cache La <br /> Poudre Ditch and from the base of the Platte River Power Authority Power Pole to the <br /> highwall crest. Please explain this discrepancy between the proposed minimum offset <br /> distance and the stability analysis offset used in the models. <br /> Response 52 <br /> The 50-foot offset is the minimum distance to be maintained between the highwall crest <br /> and permanent man-made structures during mining. This distance is not proposed to be <br /> changed. The modeling done for a point 30 feet from the structures to be safeguarded <br /> assumes that the highwall crest is 50 feet from the structure to be safeguarded and simply <br /> Response to DBMS comments T E L E S T <br />