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weight and vibrations of heavy machinery, vehicle parking, and the <br />storage of fill and/or construction materials within the critical root <br />zones of trees. <br />/ <br />3. Changes in soil chemistry will adversely affect tree survival. The most <br />frequent occurrence is the change (decrease) in soil acidity by <br />concrete washout. The leakage or spillage of toxic materials such as <br />fuels or paints can be fatal for trees. <br />D. Trunk and crown disturbances are generally mechanical in nature and <br />are either caused directly by clearing and grading machinery, or indirectly by <br />debris being cleared and falling into trees marked for protection. <br />1 . Common forms of damage include stripped bark and cambium, split <br />trunks, and broken limbs. <br />2. Damage also occurs from the posting of signs such as building <br />permits, or survey markers on trees. <br />3. Indirect damage can be caused by the placement of bum holes or <br />debris fires loo close to trees. The possible range of damages includes <br />scorched tmnks with some cambial dieback, the loss of foliage due <br />to evaporative heat stress (leaf desiccation), and completely burned <br />tmnks and crowns.