ISA Municipal Specialist case studies
ISA Municipal Specialist · Put your knowledge to work in context.
The ISA Municipal Specialist credential is a specialty certification for arborists and urban foresters whose work is shaped by public ownership: street trees, park trees, right-of-way plantings, and the political and budgetary machinery that surrounds them. It is aimed at people who already hold ISA Certified Arborist status and want to demonstrate competence in the municipal context specifically, where the technical work is entangled with ordinances, public money, elected officials, contractors, and residents who all feel entitled to an opinion about the trees in front of their houses. The ISA Municipal Specialist case studies are 5 cases and about 3,418 words.
1The Hardship Variance for a 34-Inch White Oak
Riverton's tree ordinance protects every tree 8 inches DBH or larger on private property and requires a removal permit, a 2:1 mitigation ratio (caliper inches planted per inch removed), and a variance only upon written findings of "unnecessary hardship." A developer proposes a 60-unit affordable housing project on 3.1 acres and applies to remove 14 protected trees, including a 34-inch white oak and three 20-inch maples. The site plan shows 58 of 60 units still fit if the oak and the access drive are reconfigured, at an estimated added cost of $190,000.
771 words, about 4 min2A 5,000-Tree Pledge Built on Two Incompatible Numbers
Fairview has a 2019 inventory of 12,400 public street trees recording species, DBH, and condition. It has no inventory of park, institutional, or private trees.
682 words, about 3 min3Eighteen High-Risk Trees and a $42,000 Budget
Lakeside manages 6,800 park and street trees. A Level 2 risk assessment of 420 trees in 12 high-use parks identified 18 trees rated high risk.
679 words, about 3 min4Fill Eighteen Inches Deep Inside a Heritage Oak's Root Zone
During a routine inspection of a 4.2-acre commercial site, you find that the required tree protection fencing around a 30-inch DBH bur oak - designated a heritage tree - has been removed. About 2,000 square feet of fill, roughly 18 inches deep, has been placed within 12 feet of the trunk, and a tracked excavator is parked on the fill.
565 words, about 3 min5A Late Delivery of Nonconforming Nursery Stock
A city contracts for 400 balled-and-burlapped trees for fall planting at 285 each, with a two-year 80% survival warranty. The specification requires 2.0–2.5 inch caliper, root flare visible at grade, no girdling roots, stock grown within 150 miles, and delivery between October 15 and November 1.
721 words, about 4 min