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grade changes will be permitted which would cause water to drain to within twice the <br /> longest radius of the dripline of any tree OR which divert natural drainage patterns from the <br /> trees. The trees' normal source of water needs to be preserved or replaced if removed. <br /> S. Only minimal paving will be permitted within the TPZ. When it is absolutely <br /> necessary,porous materials will be used and aeration and water permeability will be <br /> evaluated and ameliorated. In the case of the entrance road through the forest, special <br /> procedures will be written to address this unique situation. Wood decking is permitted, and <br /> actually encouraged within the TPZ(to reduce compaction caused by pedestrians), <br /> however the supporting concrete piers must be at least 10 feet away from the trunk in every <br /> direction. <br /> 9. Roots of less than 1 inch in diameter may be cut but damaged roots will be traced <br /> back and cleanly cut behind any split,cracked or damaged area. <br /> 10. Roots over 1 inch in diameter may not be cut without onsite approval of an <br /> arborist/consultant. Depending upon the type of improvement being proposed, bridging <br /> techniques or a specific design may need to be employed to protect the root and the tree. <br /> 11. Landscaping within the TPZ will consist of drought resistant plant species <br /> compatible with the water requirements of the trees. The best treatment under oaks is <br /> native annuals and oak leaf litter. No shrubs, vines, or large herbaceous materials will be <br /> planted within six feet of the trunk of any tree 6 inches or greater in diameter. Naturally <br /> occurring annual and perennial species, as well as planting of native perennial grasses will <br /> be permitted within the TPZ. <br /> 12. No permanent, underground artificial irrigation system will be allowed within the <br /> TPZ. Temporary, surface irrigation lines will be permitted for plant establishment in the <br /> first two years. <br /> 13. Trees will be pruned only for reasons of human safety, tree health and esthetics <br /> after consultation by a certified arborist. Construction personnel will not prune trees. <br /> Pruning must follow ISA pruning standards. (see Appendix). Unhealthy trees may be <br /> Buckeye Ranch Resource Plan (November, 1993) <br /> 255 <br />