Notes
Slide Show
Outline
1

Tree Ordinance Amendments
Public Hearing
Thursday, December 1, 2005
2
Reduction in required mitigation
[35-523(f)]
  • Current mitigation ratios encourage preservation of large trees
  • Mitigation fees are essential for restoring health of our urban forest and funding tree planting
  • Recommendation: Denial




3
Random Grid Method [35-523(e)]


  • Only 6% of the land area (black squares) is sampled for heritage trees.
4
The odds are against this tree

  • Odds are 16 to 1 against a heritage tree being counted by the random grid survey. It is likely old heritage trees like this will not beat the odds.
5
Random Grid Method
  • Heritage tree removal is not sampled; there is no measurement of what is destroyed
  • Method is grossly inaccurate
  • Accuracy has never been tested.
  • What other cities use it for land development?


6
Uncertainty in Heritage Tree Count
95% Confidence
7
Random Grid Tree Stand Delineation Alternative [35-523(e)]
  • Recommendation: Denial
8
Invasive Exotic Species [35-523(d)(3)]
  • Recommendation: Approval contingent on the following changes:
9
Elimination of Root Protection Zone in Parking Lots [35-523(j)]
  • A “blank check” amendment; there is no written specification for the “alternative construction” methods
  • There is no limit on the use of the “alternative”
  • “There is no scientific evidence that these treatments improve conditions for tree growth”
    Trees and Development, A Technical Guide to Preservation of Trees During Land Development, 1998, International Society of Arboriculture
  • Recommendation: Denial
10
Reduced standards for athletic fields
35-523(e)(10)
  • Recommendation: Approval