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2 <br />New Horizon TR 78 Sediment Pond 016 Review <br />Rule 4.05.6 Sediment Ponds and Rule 4.05.9 Impoundments <br />Pond 016 is designed and constructed to meet the revised postmining drainage requirements for the approved <br />modeled postmining topography delineated watersheds. Please note the following DRMS concerns regarding <br />permit text. <br />It appears to DRMS that pages 2-5 of Attachment 2.05.3(3)-29 (as per TR70) no longer reside in the permit <br />document. DRMS notes the above referenced pages provide important design and engineering information <br />including site specific hydrologic parameters on the construction and capacity of pond 16. <br />1. DRMS suggests that specific portions of the above cited discussion remain part of the permit. Please <br />submit revised pages to that effect. <br />2. As in the text for TR70, regarding Attachment 2.05.3(3)-x please maintain references to site specific <br />hydrologic parameters, (curve numbers, etc) by referencing the section and page number in the permit <br />document where these tables reside. <br />DRMS understands that during construction things may change. <br />3. Should any portion of the above referenced discussion have changed during construction of the pond <br />relative to the design parameters proposed in TR 70 please advise DRMS and provide appropriate <br />revised pages, and in addition, please bring the changes to DRMS's attention. <br />Permit Section 2.05.3(3) Mine Facilities <br />DBMS notes that the NPDES permit references were removed from the above mentioned section of <br />the permit. <br />4. Please clarify with DRMS why the NPDES permit was removed from the permit. <br />5. If CDPHE provided documentation on making this permit inactive please provide this <br />correspondence to DRMS. <br />New Horizon Technical Revision TR78 Prepared by: R. Reilley <br />Date: March 2017 <br />