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COLORADO <br />RAD <br />Division of Rectamatim <br />Mining and Safety <br />DCp4 aroer S of HatiarM 4 <br />Ms Miranda Kawcak <br />Seneca Property, LLC <br />29515 Routt County Road #27 <br />Oak Creek, CO 80467 <br />21 August 2020 <br />Re: Yoast Mine Permit C1994082 <br />DRMS Adequacy Review of Surety Release Request SLS <br />Dear Ms Kawcak: <br />The Division has completed its review of Yoast SL8 received by the Division on 8 June <br />2020. The Division's review comprised numerous rules with adequacy questions for Rule <br />3.03.1(3)b). <br />Rule 3.031(3)b): Release of Performance Bonds <br />DRMS August 2020 <br />For phase Il bond release sediment loading must be analyzed in order to demonstrate the <br />contribution of suspended solids to streamflow or runoff outside the permit boundary. DRMS is <br />unable to verify the contributions of suspended solids to streamflow or runoff as no TSS data <br />was included in the application. This information is generally submitted with the phase 11 <br />application. In previous phase 11 applications, DRMS has requested that this information be <br />provided. The Division requests the following information: <br />TSS data for ponds <br />2. An analysis using a predictive model, such as SEDCAD or RUSLE, comparing <br />suspended solids generated from pre mining lad or comparable adjacent areas to the bond <br />release area. <br />3. Any text and tables regarding a phase 11 sedimentology and hydrology and water quality <br />supporting information <br />4. TSS data for outfalls. <br />Two items require correction in the SI -8 application as follows: <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br />Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director <br />