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Consensus reached between OSM (Office of Surface Mining) and Colorado Mined <br />Land Reclamation Division (CMLRD) was that Trapper Mine would have negligible <br />impact on alluvial systems. Appendix H of the permit provides two in depth studies <br />relating to AVPs and finds that mining activities will have negligible if any affect on <br />potential AVPs. <br />Section 4.8.1.2 of the permit discusses surface drainage during mining and haul <br />road culvert sizing and lists culverts. Culverts are sized to the 10 year 24 hour <br />event. Map sheets M51 comprises the drainage and sediment control plan for the <br />permit. <br />These sections adequately address Rule 2.05.6(3)(a)(i) and sections (b)(i) and <br />(b)(iii). <br />The permit describes the protocol for water quality sampling, analysis and <br />reporting, as well as seasonal information on water quality. <br />Surface water quality data resides in Appendix C. Tables 2.7-15 to 18a provide the <br />water quality and sampling analysis required by rule 2.04.7(2)(b)(ii). <br />Section 4.8.5.1 of the permit addresses surface water monitoring. Table 4.8-8 <br />provides operational surface water monitoring results from 1977 through 1980. <br />Tables 4.8-11 and 12 respectively present the monitoring schedule and the <br />parameters sampled. <br />Review of 2011, 2013 and 2014 AHR indicates that surface water monitoring fulfills <br />the monitoring program submitted under 2.05.6(3)(b)(iv) and approved by the <br />Division. <br />There is monthly sampling of Temp, flow, pH, Conductivity, TSS, Sedsol, TDS, Fe, <br />and Al for NPDES sample points 002 through 024 and site S-1 Flume Gulch and the <br />parameters below. <br />o Total dissolved solids or specific conductance corrected to 25° C <br />o Total suspended solids (mg/1) <br />o Acidity <br />o pH <br />o Total dissolved Iron, Manganese each in (mg/1) <br />Appendix P details the drainage reconstruction plan. Ditch flow rates were <br />determined through hydrologic modeling for the 10 year, 24 hour event and models <br />are available in Appendix Q. Section 4.8.1.3 of the permit discusses post mine <br />drainage stabilization. <br />Review of section 4 of the permit shows that the general requirements of <br />2.05.6(3)(a)(ii-iii), and (b) (i -v) are adequately addressed <br />Trapper Mid Term Review Prepared by: R. Reilley Page 5 <br />Date: June 2015 Document Location: M\\Coal\rar\MidTermReviews <br />