703Tree Wells, Tree Walls, and Root Protection

703.1 General Description

This work includes protecting the root systems of selected trees and shrubs with retaining walls, tree wells, and porous material.

703.1.01 Definitions

General Provisions 101 through 150.

703.1.02 Related References

A. Standard Specifications Section 607—Rubble Masonry Section 834—Masonry Materials Section 842—Clay Pipe Section 893—Miscellaneous Planting Material B. Referenced Documents General Provisions 101 through 150.

703.1.03 Submittals

General Provisions 101 through 150.

703.2 Materials

Use materials that meet the requirements of the following specifications: Material Section Mortar and Grout 834 Masonry Stone 834 Clay Underdrain Pipe 842.2 Clay Drain Tile 842.2 Porous Material 893.2.05 Tree Paint 893.2.06

703.2.01 Delivery, Storage, and Handling

General Provisions 101 through 150.

703.3 Construction Requirements

703.3.01 Personnel

General Provisions 101 through 150.

703.3.02 Equipment

General Provisions 101 through 150.

703.3.03 Preparation

General Provisions 101 through 150.

703.3.04 Fabrication

General Provisions 101 through 150.

703.3.05 Construction

A. Excavating and Filling Foundations Avoid unnecessarily injuring root systems when excavating for tree wells and tree walls. Excavate and fill foundations to these requirements: • To the elevations shown on the plans or as directed • To the full widths and lengths of footings shown on the plans Where the soil under tree wells or tree walls is unstable, backfill the foundation area with broken stone, coarse gravel, or other approved material and firmly tamp it. Ensure that foundations firmly and uniformly support masonry. B. Constructing Masonry Build the tree wells and tree walls from rubble masonry according to Plan details. Use rubble masonry according to Section 607. C. Providing Drainage Provide adequate well drainage using weep holes, pipe drains, drain tile, or porous material as shown on the plans. D. Protecting Tree Roots Where tree root protection is required, spread porous material loosely to the extent and depths indicated on the Plans, or as directed by the Engineer. Before spreading porous material, clean the tree root protection area of vegetation. Before backfilling over a tree or plant that will be preserved, place porous material above its roots. E. Damaging Plants Avoid cutting roots or damaging trees and shrubs while building tree wells and tree walls and placing the porous material to protect the roots. When making necessary cuts, use sharp tools and cut cleanly according to the best horticultural practices. Immediately cover with tree paint, all scarred or cut surfaces 1 in. (25 mm) or more in diameter.

703.3.06 Quality Acceptance

General Provisions 101 through 150.

703.3.07 Contractor Warranty and Maintenance

General Provisions 101 through 150.

703.4 Measurement

A. Tree Well and Tree Wall Tree well and tree wall masonry completed and accepted is measured for payment in cubic yards (meters). B. Porous Material Porous material for tree root protection, placed and accepted, is measured for payment in cubic yards (meters) as measured loose in the vehicle at the point of dumping. C. Drain Pipe or Tile Drain pipe or drain tile is measured for payment in linear feet (meters) along the center of each line, lateral, or riser from ends-to-center or center-to-center of junctions and fittings. D. Excavation, Paint, and Replacement or Disposal of Material No measurement or payment is made for excavation, tree paint, replacement of unsuitable material, or disposal of surplus material. These are considered a part of the Pay Item to which each pertains.

703.4.01 Limits

General Provisions 101 through 150.

703.5 Payment

Rubble masonry for tree wells and walls and porous material for tree root protection will be paid for at the Contract Unit Price per cubic yards (meters). Clay drain pipe or drain tile will be paid for by the linear foot (meter). Payment will be made under: Item No. 703 Rubble masonry for tree wells and walls Per cubic yard (meter) Item No. 703 Porous material for tree root protection Per cubic foot (meter) Item No. 703 Drain pipe_____ in. (mm) Per linear foot (meter) Item No. 703 Drain tile_____ in. (mm) Per linear foot (meter)

703.5.01 Adjustments

General Provisions 101 through 150.