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The term "arboricultural operations" is vague and open to interpretation.
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Not really, read the first three points in the Z133:
AMERICAN NATIONAL STANDARD FOR ARBORICULTURAL OPERATIONS: SAFETY REQUIREMENTS
1 GENERAL
1.1. Scope This standard contains arboriculture* safety requirements for pruning, repairing, maintaining, and removing trees; cutting brush; and for using equipment in such operations. Terms specific to the safe practice of arboriculture appear in boldface type at first use and are defined in Annex A, the glossary.
1.2 Purpose The purpose of this standard is to provide safety criteria for arborists and other workers engaged in arboricultural operations. It is intended as a guide to federal, state, and local authorities in drafting their regulations and may be adopted in whole or in part.
1.3 Application
This standard is intended to apply to all employers engaged in the business, trade, or performance of arboriculture; this includes tree pruning, repairing, maintaining, removal, brush cutting, or pest and soil management who hire one or more persons to perform such work. This standard serves as a reference for safety requirements for those engaged in pruning, repairing, maintaining, or removing trees, cutting brush, or performing pest and soil management. This standard may require situational modifications in response to personnel emergencies and is not intended to limit the options available to emergency responders.
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That seems pretty clear.
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Really? Tree work entails so much more than,
pruning, repairing, maintaining, and removing trees; cutting brush; and for using equipment in such operations.
So any other tasks, like raking or shrub pruning could be considered exempt. What about stump grinding? Is that considered tree removal? If so it should say so.
I wear my PPE all the time, but honestly the entire Z is full of loop holes, which are subject to individual interpretation. The standards are gray, not black and white. The entire Z is written that way. People know this and interpret the standards to fit their particular needs for the particular task at hand.