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LG Everist <br /> February 5, 2019 <br /> Page 2 of 2 <br /> states that the working faces within the stages will be mined to a"near vertical"configuration <br /> prior to installation of the liner/backfill. Assuming an average depth of 35 feet,to achieve a 3:1 <br /> (H:V) lined, final slope for the interior of the reservoirs will require approximately 136,111 cubic <br /> yards of material to be placed and compacted per 1000 feet of perimeter distance. Will the <br /> required volume of material be available on-site? <br /> Please provide DRMS with a conceptual schematic for the configuration and installation of the <br /> clay liner, and a total perimeter distance around each mining stage to be reclaimed as lined water <br /> storage(Stages 2-5). This will allow DRMS to more accurately calculate the bond required to <br /> seal the reservoirs to SEO standards and to re-slope the interior of the reservoir areas to no <br /> steeper than 3:1. If you have recent rates for this work that you wish DRMS to use,please <br /> provide adequate documentation for those rates. <br /> Please submit responses to these items to the Division in advance of the TR decision date of <br /> March 4,2019. If there are still outstanding deficiencies and the permittee has not requested <br /> additional time, in writing,the Division must issue a surety increase based on the information <br /> already provided. <br /> If you have any questions,please contact me at(303) 866-3567 x8140. <br /> Sincerely, <br /> Eric Scott <br /> Environmental Protection Specialist <br />