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Chavers Mining Resource <br /> DRMS Permit No.M-2015-030 <br /> Amendment No.2(AM-02) <br /> March 2024 <br /> Page 10 <br /> (6)No drill or auger holes, adits, or shafts are associated with the mining operation. All <br /> monitoring wells will be properly abandoned prior to completing reclamation. <br /> (7) Contouring of the Site will result in maximum slope(s) that are compatible with <br /> surrounding conditions and selected land use. <br /> (8)The grade of the land will allow for use of farm machinery to traverse the Site. <br /> (9) This document, Amendment No. 2 (AM-02), serves as ASCI's notice of intent to <br /> backfill using clean,uncontaminated materials generated outside of the approved permit <br /> area in addition to materials generated within the permitted area. <br /> (a) The location of backfill sourced off-site will occur in the remaining±71 <br /> mineable acres. <br /> (b) The approximate maximum total volume of backfill material is estimated to <br /> be± 3.0 million cubic yards. <br /> (c) A signed affidavit certifying that the material is clean and inert, as defined by <br /> Rule 1.1(22) is provided as Attachment 1 of this document. <br /> (d) Backfill of material generated off-site will commence in 2022/2023 and end at <br /> the completion of Reclamation Phase 1. <br /> (e) The backfilled Site will result in a post-mining configuration that is <br /> compatible with the post-mining land use(i.e., rangeland)being requested for <br /> approval by this Amendment No. 2 (AM-02). <br /> (f) Backfill material will be pushed into the excavation and/or placed and spread <br /> in one(1) to two (2)-foot lifts using haul trucks,bulldozers, excavators, and/or <br /> loaders. Compaction will take place during the filling process, as haul trucks <br /> and heavy equipment traverse over the fill material. <br /> (10) All mined material not compatible for off-site use(e.g., fines) will be backfilled to <br /> prevent any release of unauthorized fine material to the surface drainage system. <br /> (11) No unauthorized release of pollutants to groundwater will occur from materials <br /> mined, handled, or used as backfill within the permit area. No toxic or acid producing <br /> materials are used in the mining process. <br /> 3.1.6 Water — General Requirements: ASCI will minimize disturbances to the prevailing <br /> hydrologic balance and water quality of systems (surface and groundwater)both during <br /> and after mining and reclamation phases. <br /> (1) Hydrology and Water Quality: ASCI will continue to comply with applicable <br /> Colorado water laws and regulations to ensure no injury occurs to existing water rights <br /> and maintain water quality standards of the Water Quality Control Commission <br /> (WQCC). ASCI will continue to maintain the appropriate permits and plans(e.g.,CDPS <br /> Discharge Permit and approved SWSPs) along with replacement water lease(s) <br />