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12. North Clear Creek is within 300 feet of the toe of the WRL. As required by Rule 3.1.6(1), <br /> describe how the applicant will ensure that mining operations will not impact water <br /> quality in North Clear Creek. In addition, please specify if surface water monitoring is <br /> required under any of the other permits, licenses or approvals which will be sought for <br /> the proposed mining operation. <br /> A CDPHE CPDS discharge permit will be in place for the discharges from the site, including <br /> those present at the toe of the WRL. These discharge points will serve as water quality <br /> compliance points. Proper installation of the WRL as described in the permit exhibits will ensure <br /> that mining operations will not negatively impact water quality in North Clear Creek. See <br /> discharge points as shown on Appendix 1 maps and commit to a discharge permit in Exhibit M. <br /> 13. The applicant should explain why the SCS method was not used to estimate peak flows <br /> from the mining operation. (Only volumes are provided.) <br /> Please see the revised Exhibit G components; SCS calculations of peak flows for each basin <br /> are now included. <br /> 97. Please review and respond to the adequacy review letter provided by Zach Trujillo, <br /> DRMS (see enclosed letter, dated July 23, 2021). <br /> Questions posed by Zach Trujillo are shown in blue italics font with Young Ranch Resource <br /> responses shown in black text. Mr. Trujillo's questions are unnumbered; therefore, questions <br /> and responses are shown in bulleted form. <br /> • Please have YR provide additional discussion on why highwalls will not be eliminated <br /> entirely and approximately 10% of highwalls will remain after backfill and grading <br /> concludes. <br /> Approximately 10% of reclaimed faces will remain as cliff faces to preserve the current aesthetic <br /> and function of the site. Wildlife of the area sometimes prefer rocky ledges; therefore, they are <br /> included in the quarry reclamation plan. All WRL surfaces will be backfilled and reclaimed. <br /> Please refer to the response to the Division's questions 32, 35, and 37 of their Preliminary <br /> Adequacy Review. <br /> • Please have YR provide additional discussion on how they plan on grading the <br /> reclaimed pit slopes so that it is done in a manner to control erosion and siltation of the <br /> affected lands to satisfy Rule 3.1.5(3). <br /> Pit slopes will be backfilled and graded while the bench spanning safety and stormwater berm is <br /> still in place. This berm will be constructed to half-wheel height of the largest piece of heavy <br /> machinery that enters the area per MSHA regulations. Only during the last step of grading will <br /> this berm be incorporated into the reclaimed slope. Immediately following final grading and <br /> pending seasonal limitations, vegetation planting and seed distributing will occur. If a bench is <br /> fully reclaimed outside of vegetative planting and growing seasons, the active bench below with <br /> a complete and intact stormwater and safety berm will serve to control erosion from the graded <br /> bench above. It should be noted that only one 25-foot-tall bench would find itself in this position <br /> with all higher and earlier mined benches vegetated and stabilized. <br /> December 2021 33 Lewicki 81 Associates <br />