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Coal Metbane DminaBe Project - Pane[t 76-24 Wet( E(k Mine • Page 3-8 Those disturbance areas not located in proximity to surface drainages would have minimal impact on surface water. Proposed mitigation measures including soil salvage, installation of drainage structures on roads, drainage control measures for drill pads, road maintenance, and reclamation of surface disturbance would generally be effective in preventing or limiting soil loss, erosion, and sedimentation. In addition, specific USFS requirements, as incorporated in the proposed Conditions of Approval, and applicable drainage and sediment control and surface water monitoring requirements of the CDMG Performance Standazds would help to assure prevention of surface water impacts. The potential exists for indirect surface water impacts due to the drilling and well completion activities, as well as during long-term operation and maintenance of the MDW's. Drill rigs and support vehicles would utilize and transport fuel to each drill pad, as well as drilling supplies including water and drilling circulation media. Accidents resulting in the rupture of Euel tanks or spillage of drilling supplies pose the greatest potential for impacts to soils and surface water quality through the release petroleum or chemicals. Proper transportation and handling practices and the use of staging area(s) should help to minimi>e the potential fox accidents. Since most equipment operations would occur in the drill pad areas, any minor spills would be contained by the mud pits and drainage control berms in these areas. As previously noted in Section 1.3.4, all drilling fluids and additives that would be used are either naturally occurring inorganic or organic materials or biodegradable compounds. Loss or spillage of these materials would not have any long-term adverse water quality effects. A total of 17 drill pads and 22 MDWs would be located in or adjacent to the WIZ. These locations are displayed on Map 1, Project Area Activities With Surface Stipulations. Table T3, Drill Pad Stipulation Effects Summary, and Table T4 Road Stipulation Effects Summary, list the affected drill pads and roads. Construction in areas adjacent to the WIZ would be reviewed on the ground by USFS personnel to determine whether or not the WIZ would be affected and if additional mitigation measures should be implemented. There are approximately 3.9 miles of existing roads that have segments that run pazallel to drainage courses within WIZ areas. These roads include portions of the Minnesota Creek, Dry Fork, Horse Gulch, West Flatiron, and Upper Deep Creek Roads. Alternatives 2, 3, and 4 include construction of approximately 1.1 miles of new road that would tun parallel to drainage courses in the WIZ. An exception to the lease stipulation is required for road construction in WIZ that is not a perpendiculaz crossing. 3.1.2.3 Alternative 1, No Action in the No-Action Alternative, road construction or reconstruction, drill pad construction, drilling, or surface methane drainage activities described in this project would not occur. Therefore, there would be no new surface disturbance or associated impacts to the geology, surface water, ground water, or riparian areas. Current MCC methane drainage activities for Panels 14 and 15 would be completed and associated disturbance aeeas reclaimed. Under this alternative approximately 5.2 miles of the existing Long Draw and West Flatiron roads would be reclaimed and obliterated. 3.1.2.4 Alternative 2, Sylvester Gulch/Long Draw Saddle Long-Term Access New road construction would result in a 30 foot wide disturbance area. Construction of roads on locations where roads historically existed would result in 15 feet disturbance width. Estimated surface disturbance for road construction in Alternative 2 would be 30.5 acres. Estimated surface disturbance For road decommissioning would be 52.4 acres. Estimated surface disturbance for construction and obliteration of 54 drill pads would be 37.8 acres. Although the conditions for project approval (Section 2.4.1) include mitigation measures to decrease impacts, this disturbance would result in soil movement, erosion, and reduction in productivity. Environmental A.rreument P.'®P/Mwy. Cr'G/I:.li ll../i I/~/0}EI VfFS l/I/OSA