1. (1) Affected personnel must be notified of the potential failure zone of any tail tree, intermediate support tree and standing tree anchor.

   NOTE: The potential failure zone is that area which could be impacted by the failure of any part of a tail tree, intermediate support tree or standing tree anchor as the result of forces or loads imposed on the tree by guylines, running lines or skylines.

2. (2) The boundaries of the potential failure zone must be determined by a competent person.
3. (3) The boundaries of the potential failure zone must encompass the area into which the tree or parts of the tree could fall, slide or roll and all trees, logs, lines and material that could be impacted by the tree failure.

4. (4) Personnel must be in the clear of the turn and out of the potential failure zone of a standing tree skyline or running line anchor before lines are tensioned.

   NOTE: Personnel may be in the potential failure zone when minor positioning of the rigging is needed or to set chokers.

   NOTE: "Before lines are tensioned" means before:

   1. (a) Logs are moved or suspended.
   2. (b) The rigging or carriage is moved to the landing or returned to the brush.
   3. (c) Lines are tight-lined to clear up the road.
   4. (d) Any movement or tightening of the line(s) other than that needed for minor positioning of the rigging or carriage to set chokers.

5. (5) Personnel working around tail and intermediate support trees must be in the clear of the turn and out of the potential failure zone before lines are tensioned.

   NOTE: Personnel may be in the potential failure zone when minor positioning of the rigging is needed or to set chokers.

6. (6) If the potential failure zone cannot be determined, personnel must move at least 1 1/2 tree lengths from the base of tail and intermediate support trees, and in the clear before lines are tensioned.

7. (7) A competent person must instruct affected personnel in the safe work practices required for work activity in any potential failure zone. This instruction must identify the:

   1. (a) Boundaries of the potential failure zone
   2. (b) Potential for the boundaries of the failure zone to change when line pull and line angles change.
   3. (c) Limitations or restrictions for entering or working in the potential failure zone.

Statutory/Other Authority

ORS 654.025(2) & 656.726(4)

Statutes/Other Implemented

ORS 654.001 - 654.295

History

OSHA 5-2003, f. 6-2-03, cert. ef. 12-1-03