609Tree Wells and Tree Walls

609.01 Description

This work shall consist of constructing wells and walls to protect the root system of trees, shrubs, or other woody plants at the locations shown on the Plans or as designated by the Engineer. Tree wells and Tree walls shall conform to the details shown in the Standard Drawings or as otherwise shown in the Plans.

609.02 Materials

609.03 Procedures

The Contractor shall perform excavation incidental to and necessary for constructing tree wells and tree walls in a manner that will not damage the root system of the tree. Ends and damaged sections of roots shall be cleanly cut. Roots with a diameter of more than 3 inches shall not be cut. Before any earthen fill that will exceed 12 inches in thickness is spread over the feeding root system of trees or shrubs to be protected by tree wells, an aeration layer of coarse gravel or stone, ranging from 1/2 to 5 inches in size, shall be spread over the entire area to a depth of at least 6 inches or at the rate of 3 inches for every 12 inches of earthen fill where such fills will be more than 2 feet in depth. The layer of aggregate shall be capped with sufficient fine screenings to choke the top of the porous fill. Aggregate shall not be placed inside the tree well.

609.04 Measurement and Payment

Tree wells and tree walls will be measured in cubic yards of masonry and will be paid for at the contract unit price per cubic yard for the standard specified. This price shall include excavating, and furnishing and installing stone, masonry block or block faced brick, drain pipe, geotextile fabric and backfill, including aggregate. Payment will be made under: —————————————————————————— Pay Item Pay Unit—————————————————————————— Tree well (Standard) Cubic yard Tree wall (Standard) Cubic yard—————————————————————————— 609.04