Illinois Tree Line USA Currently serving 7.2 million Illinois citizens or 65% of the state’s population through the TREE CITY USA PROGRAM Welcome to the DNR TREE CITY USA website.
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Specifications for
Trenching and Tunneling for the |
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Tree Diameter (a)
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Distance of Tunnel
from Face of Tree Trunk - Each Side (b)
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Recommended Depth of
Tunnel or Trench
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5 - 9"
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6'
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2-1/2'
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10 - 14"
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10'
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3'
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15 - 19"
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12'
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3-1/2'
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20" or more
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15'
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4'
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A Note to Citizens: |