2016-08-10_PERMIT FILE - P2016021 (2)

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2.6.3. Surface and Ground Water Erosion Prevention and Stormwater Control [43 CRF 3809.401 (b) (2) (til)]; Exploration operations will be managed to ensure that controls and prevention measures are in place to minimize soil erosion. Equipment will not be operated when ground conditions are such that excessive resource damage or increased sediment transport will occur. BMPs for sediment control shall be employed during construction, operation, and reclamation to minimize sediment transport from disturbed areas. Sediment control structures may include, but are not limited to, fabric and/or certified weed free straw bale filter fences, siltation or filter berms, mud sumps, and down gradient drainage channels. Sediment traps (sumps) will be used to manage drill cuttings and prevent release of sediment. Certified weed -free straw bales and silt fences may be placed in drainages to capture sediment. Drainage structures will be constructed or installed where necessary to prevent or minimize erosion and sedimentation. Drainage structures may include, but are not limited to, waterbars, borrow ditches, contour furrows, and culverts. Drill site cut banks will be constructed with the appropriate slope to minimize erosion and visual effects. Disturbed areas will be broadcast -seeded with an approved seed mix to minimize erosion after construction. Drilling Effluent Management [43 CRF 3809.401 (b) (3) (1)]; Drilling fluid products used during drilling and abandonment operations will meet Colorado Revised Statues material specifications as defined in the Colorado Mined Lands Reclamation Act (CMLRA) Title 34, Article 32, Section 11.E Drilling fluids will be contained and deposited in sumps to ensure environmental protection. If water is decanted from the sumps, drilling fluids and solids will be allowed to settle prior to decanting. Sumps for drill water, fluids, and cuttings will be excavated within the limit of the drill site using a backhoe or similar equipment. Anticipated sump dimensions will be about 8 feet by 8 feet by 4 feet deep, sufficient to hold up to 2,000 gallons of fluids. One end of each sump will be sloped to provide egress for animals. No significant water is expected to be produced from the drill holes due to the elevated, ridgeline locations of the drill collars. Sumps will be backfilled after completion of drilling. If mud tanks are cleaned at the site, the contents will be contained in the sump and covered with backfilled soil materials. No drill site will be located closer than 100 feet from a lake shore or a flowing stream. No drill effluent will be released directly into any lake or active stream course. Drill Hole Abandonment [43 CRF 3809.401 (b) (3) (1)]; Drill holes will be plugged in accordance with Colorado State and administering agency standards. Material specifications will be consistent with the definitions in CRS 3¢� 113for grouting material.