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) In Region I, on all state lands and on
all other public lands, the slope stability standards in this section apply
within 100 feet of an ordinary high water mark of an anadromous or high value
resident fish water body, or a water body 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.
(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.
Notes
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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