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• Hydrology <br />o A Storm Water Prevention Plan (SWPP) and permit is required by the State of <br />Colorado, Water quality Control Commission for the.proposed NOI actions. The <br />surface area disturbed by exploration operations, and final land reclamation <br />planning will be consistent with the approved SWPP. <br />o Exploration operations will be terminated during times when ruts on access roads <br />exceed 4" in depth, as determined by the authorizing officer. <br />o For all newly disturbed areas, including, pads, pits and access roads, site specific <br />locations shall be selected to minimize soil cut and fill volumes. Additionally, <br />these sites will be located to avoid encroachment or interception of drainage <br />channels (any defined channel having a bottom width of 2 feet wide or greater), <br />where possible. <br />o On all road crossings of defined drainage channels, any needed cut and fills or <br />other channel modification will be at the minimum necessary to provide safe <br />access across the channel. All channel modifications will be fully reclaimed and <br />stabilized during final reclamation. <br />o All equipment and vehicles will be confined to the approved access roads. <br />o Any cleared trees will be stockpiled for use during reclamation. <br />o Cross drains (dips, waterbars, etc) will be constructed on all access roads. Cross <br />drain design and spacing will be in accordance with the following guidelines. <br />Road Surface <br />Slo e % Cross Drain <br />Spacing ft.) <br />2 200 <br />2-4 100 <br />4-5 75 <br />>5 50 <br />a. Cross drains should be located above breaks in vertical profile from <br />shallow to steep grades to prevent the shallow grade surface drainage <br />from gaining velocity and erosive power on the steep grade. <br />b. Whenever possible cross drains should be located to release water on <br />convex slopes or other stable areas that will disperse water rather than <br />channeling it. <br />c. Cross drains should be constructed with an outslope grade of 3 to 5 <br />percent or equal to the existing out-slope grade.