Laserfiche WebLink
RULE 4 PERFORMANCE STANDARDS <br /> Should toxic forming or acid forming water discharges be encountered,the opening exhibiting the <br /> discharge will be backfilled within 72 hours of completion. <br /> Colowyo will backfill each highwall miner entrance hole within 30 days following coal extraction. <br /> All highwall miner entrance holes will be further buried by pit backfill during the normal backfill <br /> sequence for the pits to remain in compliance with Rules 4.05.1 and 4.05.2. Ground water <br /> hydrologic regimes will be re-established in the backfilled pits with no anticipated detrimental <br /> effects from the highwall miner holes. <br /> 4.23.9 Division shall prohibit Auger(Highwall Mining) Mining <br /> There is no probable reason to prohibit the highwall mining in light of no anticipated adverse <br /> impacts to water quality, fill stability, pit backfilling, increased resource recovery, and highwall <br /> mining is designed for zero subsidence to prevent disturbance or damage to powerlines,buildings, <br /> or other surface facilities. <br /> 4.23.10 Backfill and Grading Requirements <br /> Highwall mining will be conducted in accordance with the backfilling and grading requirements <br /> of 4.14. <br /> 4.23.11 Highwall Shall be Eliminated <br /> Highwall mining is proposed to occur in areas previously mined with adequate material on hand <br /> to backfill the pits with proper static safety factors for stability to the approved postmining <br /> topography thereby eliminating all highwalls. Any minimal spoil material generated by the <br /> highwall mining operation will be buried at depth in the pit backfill. All coal seams mined will be <br /> adequately covered by pit backfilling in conformance with the permitted PMT and reclamation <br /> plan. No remnant highwalls will be left at conclusion of the reclamation activities and no spoil <br /> material will be place on any outslopes. <br /> 4.24 Operations in Alluvial Valley Floors <br /> The field investigation described in Section 2.04.7 and 2.06.8 resulted in no identification of <br /> alluvial valley floors in the general area,which would be adversely affected by mining operations. <br /> Therefore, no special performance standards for operations in the alluvial valley floors are <br /> applicable to this mining permit application and no protection or remedial measures are proposed <br /> for compliance to this Section. <br /> 4.25 Operations on Prime Farmlands <br /> Since a negative determination of prime farmland was arrived at using the eligibility requirements <br /> established for prime farmland under Section 2.04.12, these performance standards do not apply <br /> to the permit application. <br /> Rule 4 Performance Standards 4-89 Revision Date: 11/18/19 <br /> Revision No.: MR-211 <br />