2011-12-20_REVISION - P2008018 (2)

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Road Surface Slope % Cross Drain Spacing (ft.) 2 200 2 -4 100 4 -5 75 >5 50 to avoid encroachment or interception of drainage channels (any defined channel having a bottom width of 2 feet wide or greater), where possible. o On all road crossings of defined drainage channels, any needed cut and fills or other channel modification will be at the minimum necessary to provide safe access across the channel. All cut and fills below the average high water line along stream channels require notification to the Army Corps of Engineers. All channel modifications will be fully reclaimed and stabilized during final reclamation. o All equipment and vehicles will be confined to existing access roads. o Any cleared trees will be stockpiled for use during reclamation. o Cross drains (dips, waterbars, etc) will be installed on newly constructed access roads. Cross drain design and spacing will be in accordance with the following guidelines. a. Cross drains should be located above breaks in vertical profile from shallow to steep grades to prevent the shallow grade surface drainage from gaining velocity and erosive power on the steep grade. b. Whenever possible cross drains should be located to release water on convex slopes or other stable areas that will disperse water rather than channeling it. c. Cross drains should be constructed with an outslope grade of 3 to 5 percent or equal to the existing out -slope grade. o BLM concurs with the bonding recommendations of the Colorado Division of Reclamation, Mining and Safety (CDRMS). Operations may begin when the bond is filed with CDRMS and a copy of the bond is submitted to this Office. Your Mining Notice is complete, the operation will not cause unnecessary or undue degradation to the public lands and it contains all the information required by BLM surface management regulations at 43 CFR 3809.301. Your notice remains in effect for 2 years from the date of this letter, unless extended under 43 CFR 3809.333 or unless you notify BLM beforehand that operations have ceased and reclamation is complete. BLM will conduct an inspection to verify whether reclamation has been completed before recommending bond release to the Colorado Division Reclamation Mining and Safety (CDRMS). On or before the expiration date, the Field Manager must be given written notice if you intend to continue operations under the terms of the existing Notice for an additional two (2) years.