ITEM 658 TREE ROOT AERATION
658.01 Description. This work consists of furnishing and placing the necessary aggregate and
tile for the protection and aeration of the roots of trees and shrubs. Use removed or excavated materials in the Work when the material conforms to the specifications; if not, then recycle or dispose of the material according to 105.16 and 105.17.
658.02 Materials. Furnish aggregate for tree root aeration and protection consisting of No. 4 or
467 limestone or gravel with a maximum sodium soundness loss of 15 percent. Furnish 4 inch (100 mm) pipe conforming to 611 Type E conduit. Furnish embankment conforming to Item 203.
658.03 Preparation. The feeding root area to be protected and aerated is the ground surface area
lying within the periphery of the tree or shrub not marked for removal. Prepare these areas by excavating all vegetation, wood, brush, and debris.
658.04 Aeration for Trees Not Welled. Where the earth fill is less than 12 inches (300 mm) and
more than 4 inches (100 mm) over the feeding root area, loosely spread an aggregate aeration course of one-half the height of fill, but not less than 3 inches (75 mm), over this area. At the tree tr unk, increase the thickness to the height of the fill and extend it outward from the tree trunk in collar form for a distance of 15 inches (0.4 m). Place a 2-inch (50 mm) layer of straw or hay over the aggregate.
658.05 Aeration with Tree Wells. Place an aeration course of aggregate while constructing the
tree wells and before any other filling. Do not place any aggregate inside the tree well (between the wall and the tree trunk). Place the aggregate over the entire feeding root area outside of t he tree wells to a total depth of 6 inches (150 mm) for each 12 inches (300 mm) of earth fill, or proportion thereof, but place a minimum depth of 6 inches (150 mm) regardless of depth of overlying fill. Place a 2 -inch (50 mm) layer of straw or hay over the aeration layer.
658.06 Earth Embankment. Perform excavation and embankment, as necessary, according to
Item 203.
658.07 Method of Measurement. The Department will measure Tree Root Aeration by the
number of cubic yards (cubic meters), measured in the carrier or truck according to 109, of the aggregate furnished, placed, completed, and accepted.
658.08 Basis of Payment. The Department will pay for embankment and excavation under Item
203 and the pipe under Item 611. The Department will pay for accepted quantities at the contract price as follows: Item Unit Description 658 Cubic Yard Tree Root Aeration (Cubic Meter)
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