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Section 10 – Environmental Controls at Work Site

No signs, ropes, cables, or any other items shall be attached to a protected tree,

except those cables recommended by a Certified Arborist for limb support.

No vehicles, construction equipment, temporary or mobile buildings, supplies,

materials, or facilities shall be driven, parked, stockpiled, or located within the

dripline of protected trees.

Unauthorized grade cuts or fills are not permitted within the dripline of protected

trees. Cuts or fills necessary beyond the dripline but near the protected trees shall

be contoured to drain away from the protected tree’s dripline.

No utility line trenching will be permitted within the driplines of protected trees. If it is

necessary to install underground utilities within the dripline of a protected tree, the

utility line shall be either bored or drilled to avoid damaging roots. If the Agency

determines boring or drilling is inappropriate, the utility line trench may be hand dug

under the direct supervision of a Certified Arborist to avoid damaging roots.

Roots approved by a Certified Arborist to be severed or that fall within the structural

section of the facility to be constructed, including building foundations or wall

footings, shall be pruned cleanly and covered with moist earth as soon as possible.

If, due to the construction, the roots must be unearthed for more than two (2) hours,

they must be kept moist and covered with wet burlap or an approved equal until they

are covered by moist earth. Supporting structural buttress roots that provide stability

to the tree or keep it from toppling shall be protected in place. The Contractor shall

hand-dig in the dripline of protected trees to prevent root cutting and mangling.

Roots one inch (1”) or greater in diameter encountered within the tree’s dripline shall

not be cut without the Agency’s approval, and shall be kept moist, as approved by

the Agency, and covered with earth within forty-eight (48) hours.

Where required by the Agency, a piped aeration system and/or a post and grade

beam foundation shall be installed beneath that portion of the paving, foundation, or

concrete slab that encroaches into the dripline of a protected tree. The piped

aeration system shall be installed under the direct supervision of a Certified Arborist.

Only drought resistant plant species, tolerant of the natural and semi-arid

environment of the native oak understory, shall be planted within the driplines of

No sprinkler systems that will irrigate or require trenching within the dripline of a

native oak tree will be permitted. An above ground drip irrigation system, which

allows for controlled application rates, may be installed to irrigate native or semi-arid

plants within the dripline of a native oak tree.

All protected trees within the Work area that require pruning for construction clearance shall

be pruned prior to commencement of construction. Native oak trees that require pruning of

branches larger than two inches (2”) in diameter shall be pruned by a Certified Arborist.