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Title 11 . Natural Resources
Chapter 95 . (No Regulations Filed)
Section 280. Slope stability standards

11 AAC 95.280. Slope stability standards

(a) The slope stability standards in this section apply to the following areas of private land in Region I:

(1) the area within 100 feet of an ordinary high water mark of a Type I-A, I-B, or I-C water body or to the break of the slope to that water body, whichever occurs first;

(2) the area within 50 feet of an ordinary high water mark of a Type I-D water body or to the break of the slope, whichever occurs first.

(b) On all state lands and on all other public lands, the slope stability standards in this section apply to the following area:

(1) in Region I, within 100 feet of an ordinary high water mark of an anadromous or high value resident fish water body, or a waterbody with a gradient of 12 percent or less that is tributary to an anadromous or high value resident fish water body, and within 50 feet of all other tributaries to anadromous and high value resident fish water bodies;

(2) in Region II, within 100 feet of an ordinary high water mark of an anadromous or high value resident fish water body.

(c) The break of a slope is the point where the slope extending up from the top of the stream bank changes to the lower angle slope of the adjacent upland. For purposes of measurement, the break of a slope is where the degree of slope is reduced by 20 percent or more when measured away from the stream.

(d) An operator shall adhere to the following standards when conducting timber harvest activity in an area identified in (a) and (b) of this section:

(1) avoid constructing a road that will undercut the toe of a slope that has a high risk of slope failure;

(2) within the riparian area of streams not subject to AS 41.17.116 (a)(3)(B) or 41.17.116(a)(4)(B), in the operator's discretion, leave low-value timber where prudent;

(3) achieve full or partial suspension in yarding operations;

(4) fall timber away from streams in V-notches;

(5) avoid sidecasting of displaced soil from road construction to the maximum extent feasible.

History: Eff. 6/10/93, Register 126; am 11/20/99, Register 152; am 6/24/2004, Register 170

Authority: AS 41.17.010

AS 41.17.055

AS 41.17.080

AS 41.17.115

AS 41.17.116

AS 41.17.118

AS 41.17.119


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Last modified 7/05/2006