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growing season. Although the use of erosion protection devices is not anticipated, if <br />deemed necessary by the operator at the time of excavation, silt fence and haybale <br />dams will be installed to prevent erosion. Backfilling and grading will be completed as <br />soon as feasible after the mining process is complete for each phase. <br />Maximum slopes and slope combinations will be compatible with the configuration of <br />surrounding conditions and selected land use. Mining will be done at a slope that is <br />stable but maximizes gravel extraction in the permit area. Reclaimed slopes in the <br />water storage reservoir will not be steeper than a 3:1 ratio. The upland area will be <br />reclaimed to grades consistent with pre-mining elevations. <br />The operator will backfill using fill material generated on-site, or imported inert fill <br />generated outside the permit area. If any inert off-site materials are used as backfill, a <br />notarized letter will be submitted to the Division as required by Section 3.1.5(9) of the <br />MLRB Construction Material Rules and Regulations. The applicant will supply such a <br />letter to the Division if, at the time of Reclamation, the applicant intends to use off-site <br />material as backfill. <br />It is not anticipated that mining will uncover any refuse oracid-forming or toxic <br />producing materials, however if any such materials are encountered the operator will <br />take precaution to handle the materials in a manner that will control unsightliness and <br />protect the drainage system. <br />Drill or auger holes that are part of the mining operation shall be plugged with non- <br />combustiblematerial, which shall prevent harmful or polluting drainage. Any test pits, <br />soils boring holes, or monitoring wells not located within the mine excavation limits will <br />be plugged as soon as it can be confirmed that they are no longer needed for the <br />operation. <br />Mined material to be disposed of within the affected area will be handled in such a <br />manner so as to prevent any unauthorized release of pollutants to the surface <br />drainage system. No unauthorized release of pollutants to groundwater shall occur <br />from any materials mined, handled or disposed of within the permit area. <br />Section 3. i.6 Water-General Requirements: The Operator will comply with <br />applicable Colorado water laws governing injury to existing water rights and with <br />applicable state and federal water quality and dredge and fill laws and regulations. <br />The applicant has installed monitoring wells on the adjacent site to establish baseline <br />conditions prior to mining and to enable groundwater monitoring during mining. The <br />operator will develop and comply with a stormwater management plan and will use <br />best management practices (BMPs) to ensure groundwater and surface water are <br />protected to the greatest possible extent. BMPs include schedules of activities; <br />prohibitions of practices, maintenance procedures and other management practices to <br />prevent or reduce the pollution in runoff from the site. <br />Hall-Irwin Corporation -Parker/Dersham Sand and Gravel Mine -MLRB 112 Permit Application <br />Exhibit E - 2 <br />