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certifying that the material used for backfill is clean and inert in accordance with Rule <br />3.1.5(9) of the Construction Rules and Regulations. <br />All mine walls will be backfilled and re-graded with slopes above and 10 feet below the <br />post-mining water level not exceeding 3H:1 V. Slopes more than 10 feet below the post- <br />mining water level will not exceed 2H:1V. Final elevation of backfilled areas will be <br />determined by estimates of the local groundwater elevation. In general, the final elevation <br />of backfilled upland areas will be at least two feet above the average groundwater <br />elevation. Wetland areas will generally be backfilled to elevations ranging from 18-inches <br />above to a maximum of 6 feet below the average groundwater elevation. <br />Topsoil will be spread over the surface of all backfilled areas which are above post-mining <br />lake levels (except silt basin wetlands) to provide a growing medium for re-vegetation. <br />Scrapers will be used to place the backfilled overburden and topsoil. Using scrapers to <br />layer the lifts at a 3:1 slope ensures a stable configuration. <br />Disturbed areas associated with processing site, roads not necessary for future access <br />and conveyors will be scarified, covered with topsoil, and revegetated. Topsoil will be <br />replaced, where required, in reclaimed areas at a depth of approximately six to twelve <br />inches. <br />Reclamation quantities and costs are summarized in Exhibit L. <br />Water <br />Al is in compliance with all applicable Colorado water laws and regulations governing <br />injury to existing water rights, all applicable federal and Colorado water quality laws and <br />regulations and all applicable federal and Colorado dredge and fill requirements for the <br />existing operations at Riverview Resource. Current permits, Stormwater Management <br />Plan and Spill Prevention, Control and Countermeasures Plan will be amended as <br />necessary to address any changes relative to the amendment properties. Information <br />contained in Exhibit G addresses in detail the general and groundwater specific <br />requirements of Rules 3.1.6 and 3.1.7. <br />Wildlife <br />The proposed amendment areas are used for farming and livestock grazing and do not <br />contain significant wildlife habitat. There is significant habitat for many wildlife species <br />along the river corridor within the existing permit boundary, and as noted above, current <br />and future reclamation adjacent to the riparian corridor is enhancing this habitat. Phasing, <br />configuration and timing of mining and reclamation activities have been designed to limit <br />impacts to wildlife.within the mine site and along access roads to the mine site. <br />This reclamation plan is being designed to maximize the upland riparian habitats by <br />returning the mined areas to native upland habitats, native riparian habitats, and created <br />wetlands. Restoring these areas from upland cultivated fields to wetlands and native <br />wetland and riparian species will allow restoration of important floodplain functions. This <br />Riverview Resource <br />Amendment to Permit M1999098 112c <br />Page E3 of E6