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Figure 13
PROTECTING TREES DURING CONSTRUCTION
dripline
dripline
6’ min
Tree Save Area
Install a protec?ve fence to create a Tree Save Area. The Tree Save Area is defined
as the area within the drip line of a tree, or the area within a radius around the tree
trunk of 1 foot for every inch of DBH, whichever is greater.
o Use 5’ chain link or welded wire with stable metal stakes or posts spaced a
maximum of 10’ apart and not easily movable.
o If protec?ve fence cannot be installed at the dripline of a tree, then it should be
installed as far away from tree trunk as possible, ideally a minimum of six (6)
feet.
o Each fenced Tree Save Area shall include signs reading, “TREE SAVE AREA – KEEP
OUT”/”AREA DE AHORRO DE ARBOLES – ENTRADA PROHIBIDA”, in both English
and Spanish
Tie protec?ve 2x4s around trunk of tree with rope, not wire.
Avoid compac?on of the soil by keeping foot and vehicle traffic and storing of materials
away from the root zone and outside the Tree Save Area.
Take special care with backhoes and other machinery to minimize damage to roots,
trunk, limbs and overhead branches.
Figure 14
EXCAVATION and TUNNELING
WITHIN DRIPLINE
6’ min
dripline
dripline
ROOT PRUNING TUNNELING
AVOID SEVERING ROOTS
Excavate around tree roots or tunnel under the root zone. Trenching without proper
root pruning can severely damage roots.
Tunneling is preferred to root pruning, where possible.
Root pruning by or under the supervision of a cer?fied arborist must be done prior to
excava?on any ?me work encroaches on the cri?cal root zone.
o Excavate using an air spade, hydro excava?on or hand tools to expose roots.
o Cut roots cleanly, removing no more than 40% of roots
o Backfill and water immediately
o If hole must be le? open past end of day, cover roots with wet burlap
o Monitor tree health and supply adequate water and mulch.
Figure 15
GRADE CHANGE GUIDELINES
MAINTAIN EXISTING GRADE AROUND TREE
Protect trees by crea?ng terraces with retaining walls to maintain the original grade around the
root zone. Cu?ng or shaving roots or piling soil on top of roots to create a con?nuous new
grade will slowly kill the tree. Avoid drainage changes that could mean a tree gets too much
water or not enough.
If a grade change is needed within the cri?cal root zone, root pruning is required before
that grade change is made. See Figure 14.