2019-02-15_PERMIT FILE - M2018060

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Applegate Group, Inc. Water Resource Advisors for the West February 15, 2019 Mr. Eric Scott Division of Reclamation,Mining and Safety 1313 Sherman Street Room 215 Denver,Colorado 80203 RE: Response to Preliminary Review of a 112 Construction Materials Reclamation Permit Application Package,Tollgate Pit,File No.M-2018-060 Dear Mr. Scott: Please see the responses below to the December 28, 2018 preliminary adequacy review of the Tollgate Pit 112 construction materials reclamation permit application(File No.M-2018-060).These responses follow the same order as outlined in the adequacy review. EXHIBIT C—Pre-mining and Mining Plan Map(s)of Affected Lands(Rule 6.4.3): In order to ensure that all underground utilities within 200 ft of the affected lands have been accounted for, an 811 engineer's request was put in on December 20, 2018. The mining plan map has been broken into two maps; Figure C-1 shows the adjacent property owners and Figure C-2 shows the mining plan and structures within 200 ft. See the two updated maps attached. EXHIBIT D—Mining Plan(Rule 6.4.4): The following is additional information regarding the original proposed methods of mining to be employed in each stage of the operation as related to any surface disturbance on the affected lands. The slurry wall will be constructed prior to the start of mining. The construction will take approximately two to three months and will be followed by a 90-day leak test,resulting in approximately six months total from the start of slurry wall construction until mining may begin. The approximate 6 to 12 inches of topsoil will be stripped off and stockpiled in the southern most portion of the stockpile area. The topsoil will be salvaged and maintained from all affected areas, including those to be utilized for stockpile and roadways,for final reclamation.Next,the overburden will be removed from the ground and stockpiled separately but next to the topsoil stockpile.Note that these two separate stockpiles will both be kept stabilized, so no excessive erosion occurs. The area will be mined with a maximum working slope of 3H:1 V around the entire perimeter of the mine boundary. Due to this, there will be no need for the entire perimeter to be re-sloped post mining during reclamation. EXHIBIT E—Reclamation Plan(Rule 6.4.5): Reclamation activities will take place in all affected areas,which includes access roads and stockpile areas. The amount of area to be topsoiled and seeded is conservative to include not only the shoreline area,but also the stockpile area,the crossing,and the armored inlet channel described in more detail below. www.applegategroup.com Denver • Glenwood Springs • Hotchkiss (303)452-661 l