RETAINING WALL DESIGN
TO PROMOTE HEALTHY TREE GROWTH

Just like any other living thing, trees need to eat and breathe. This is accomplished through the root system. Contrary to popular belief, a tree's root structure extends out well past the dripline of the canopy, sometimes two to five times that distance. Eighty-five percent of a tree's roots are concentrated in the top eighteen inches of soil, where they can obtain air, food, and water most easily. Maintaining this root environment is critical to preserving existing trees.

HOMEOWNER CONSTRUCTION TECHNIQUES - Locate and map the tree root areas to be preserved and carefully fence these areas off to prohibit all construction activity. The slightest compaction of tree roots by vehicles and machinery can cause irreparable harm to trees. Avoid paving over tree roots where possible. If necessary, apply a vapor barrier over the ground before placing pavement in order to prevent harmful chemicals contained in the paving materials from leaching through to the roots. Install PVC pipe under paved surfaces and beneath retaining walls for aeration of roots. Locate construction parking, equipment storage, and concrete washout areas away and downhill from tree root areas. Stockpile topsoil away from root zone areas and redistribute after construction to provide a good growing medium for trees and other plant material. When locating utilities, use a 'Vibratory Knife,' or auger, to clean cut through root zones. Avoid using trenchers or backhoes. This will prevent excessive and irreparable damage to feeder roots. Prune, fertilize and mulch trees in areas where they will receive stress due to construction. This will make it easier for them to return to a vigorous, healthy condition.

Adherence to the procedures will greatly reduce the possibility of harm to trees on your lot due to construction. Members of the VJW Limited Development Team will be available to answer any questions and provide additional information and suggestions as you develop your homesite.