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To: Jared Ebert <br />Date: February 14, 2018 <br />Page 19 <br />Division would incur to pump down the pit. Please see the Division's estimate for <br />details. <br />Please let the Division know if you have any addition questions or if you concur with the <br />estimate for the Phase 1 area. Also please address the following issue: <br />a. Based on the Appendix 6 document, the source of material used to construct the <br />clay liner is overburden material andfines. Please demonstrate that this material <br />when compacted will be adequate to act as the proposed impermeable clay liner. <br />If not,please provide a plan and a cost to obtain the required clay liner material. <br />Response 46b <br />LRM concurs with the cost estimate for the Phase 1 area. <br />LRM is in the process of conducting compaction and permeability tests with the fine <br />material from the Knox Pit site. The results are expected on February 16 and will be <br />provided to your office on February 20, 2018. <br />RULE 6.5 GEOTECHNICAL STABILITY EXHIBIT <br />Comment <br />The Division has reviewed the Geotechnical Stability Analysis included in Exhibit 6.5 of <br />the Knox Pit 112c permit application and the stability analysis models received on <br />January 3, 2018 in response to the Division's adequacy letter. The Division verified the <br />Applicant's stability analysis models using Clover Technology's Galena v7.1 (Galena) <br />slope stability software. <br />The Division accepts the stability analysis models for the proposed critical slope cross- <br />section and mining offsets combinations at the Knox Pit. The Applicant must contact the <br />Division immediately and re-evaluate the stability analysis if groundwater is intercepted <br />shallower than expected and/or the soils differ from the expected soil types. The <br />Applicant must understand any transgression of the sloping criteria and mining offsets <br />will be considered a violation of the permit, if approved and issued by the Division. <br />Response <br />LRM will contact the Division immediately and re-evaluate the stability analysis if groundwater <br />is intercepted shallower than expected and/or the soils differ from the expected soil types. LRM <br />understands any transgression of the sloping criteria and mining offsets will be considered a <br />violation of the permit,if approved and issued by the Division. <br />Response to DRMS Adequacy Review 3 comments T E L E S T O