1. These are just examples of the mitigation measures and a format that can be presented in the Mitigation
section of the sharepoint site;
Mitigation -- leave areas:
To maintain root strength, evapotranspiration function, and canopy cover, leave
all trees within the area delineated as potentially unstable; to provide a wind
buffer to those trees within the leave area or to protect the slope break defining
the potentially unstable area, extend the leave area to include those trees that are
on or immediately adjacent to the boundary of the potentially unstable area
To protect the slope lip and to and anticipate probable failures, measure setback
distance from lip (slope break) by looking at crown width. To establish what
distance to move back from the slope break of an unstable area, find the apparent
angle of repose of stable ground of similar character and project that slope angle
back from the toe of the unstable slope or the head of a slide area.
To avoid increased infiltration, and to maintain evapotranspiration function, leave
all trees within the delineated recharge area within which both surface and
subsurface runoff are directed onto the potentially unstable area
Mitigation – yarding corridors:
To maintain root strength, evapotranspiration function, and canopy cover and to
minimize ground disturbance over the slope, limit the width of the corridors (<12 ft).
To maintain root strength, evapotranspiration function, and canopy cover and to
minimize ground disturbance, where corridors are needed within the RMZ, limit the
number and width of the corridors; where possible select corridor locations to be
coincident with natural openings.
S. Zurenko incomplete draft
Angle of repose of
stable ground
Project that angle in
order to establish the
width of the leave
area over the slope
break

2. These are just examples of the mitigation measures and a format that can be presented in the Mitigation
section of the sharepoint site;
Require that the contract administrator approve the location of all corridors.
Require that all felled trees remain on the slope to provide catchment for soil and rock
debris should a failure of the slope occur.
Mitigation – suspension
Require all logs be fully suspended over the slope and the slope lip; measures such as
cutting the logs to length, reducing the number of logs pulled each turn, or intermediate
support may be necessary to obtain optimum lift to be bucked such that the load on the
line.
Where full suspension cannot be achieved require that the branches be retained on all
felled tress such that when yarding up the corridor the weight of the trees is distributed
over the branches.
Mitigation – thinning, scattered leave trees, selective harvest:
Mitigation – design, construction, and maintenance of drainage systems:
Mitigation – ground disturbance:
Mitigation – directional and controlled felling
S. Zurenko incomplete draft