not cl3ear what you are searching for--why would there be legislation?
the arborist has the same responsibilities in all work--be reasonable, prudent, and compliant with industry standards.
below is from
View attachment 181613 the attached, which might look familiar.
A disclaimer is a useful tool because it limits liability by describing the limitations faced by consultants and other contractors. Item 10 below is adapted from the disclaimer in the Guide for Plant Appraisal:
“10. Unless expressed otherwise: 1) information contained in this report covers only those items that were examined and reflects the condition of those items at the time of inspection; and 2) the inspection is limited to visual examination of accessible items without climbing, dissection, excavation, probing, or coring. There is no warranty or guarantee, expressed or implied, that problems or deficiencies of the plants or property in question may not arise in the future.”
When cabling was proposed for a cracked sweetgum tree in another municipality, the Public Works Director asked if the contractor would provide a guarantee. While it is common sense that trees cannot be guaranteed against failure, it seemed reasonable to guarantee what could be controlled. Item 11 is that contractor’s guarantee, which was also attached to the disclaimer with the Thoburn Oak report:
11. “The materials and workmanship involved in the cabling system are guaranteed to be free of substantial defects. The Extra High Strength (EHS) cable shall comply with ASTM A475, Standard Specification for Zinc-Coated Steel Wire Strand, so it resists corrosion and can last 30 years or more. The fasteners shall be manufactured of stainless steel to resist corrosion. The design and installation of the system is guaranteed to comply with the ANSI A300 (Part 3) -2006 Standard Practices for Supplemental Support Systems and the 2007 edition of the ISA Best Management Practices for Tree Support. The tree and the support system should be inspected every year.” (For most trees, calling for inspection every three or five years may be more appropriate. )