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Mr. Elliott R. Russell <br /> January 4, 2018 <br /> Page 5 <br /> well, located up-gradient of the back-filled pit and within the permit boundary to be <br /> controlled by either the Operator or the mine site landowner. This location will also <br /> more accurately monitor the effects of groundwater mounding. <br /> A new well will be installed as shown in revised Appendices E and H. <br /> 24. Within the Groundwater Monitoring Plan (Appendix H), the Operator states wells will <br /> be initially monitored on a monthly basis until the completion of the slurry wall <br /> construction then quarterly for the life of mine. Please define the completion of the <br /> slurry wall construction.Additionally, the Division believes monthly monitoring should <br /> occur for at least one year after the completion of the slurry wall to help define the <br /> groundwater regime and understand immediate mounding effects. Please revise the plan <br /> accordingly. <br /> Construction of the slurry wall should begin within 60 days of DRMS approval of TR-4. <br /> The construction should take of the order of 120 days. A 90-day leak test will be <br /> conducted with approval expected in 30 days, and construction will be considered <br /> complete at that time. The revised Appendix H is attached. <br /> 25.In response to Adequacy Review Item #12, the Operator included the Table I Cost <br /> Estimate to construct the slurry wall. Within Table I Cost Estimate, the costs associated <br /> with the five tasks under "Work Items by Fremont Paving"were not provided. Please <br /> provide the cost estimate to complete each of these work item tasks. <br /> A revised Table 1 is attached. <br /> We believe this response properly addresses the adequacy items. Please call if you have any <br /> questions or comments. <br /> Sincerely, <br /> DEERE&AULT CONSULTANTS, INC. <br /> Don W. Deere, P.E. <br /> Principal <br /> DWD:sp <br /> Attachments <br /> Q.\0212 Stonewall Spnngs\0212 010 Southwest Reservoir Slurry Wall\DRMS Comment And Response\September 2017 ResponsesUanuary 2018 Response\Adequacy Review Response To <br /> Comments TR-04 M-20000-041.Ltr.Docx <br />