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Preliminary Arborist Report <br />536 St. John Street, Pleasanton <br />June 20, 2016 <br />Page 4 <br />Photo 3 (above) — Both <br />of the Modesto ash <br />street trees ( #51 <br />pictured) had been <br />pruned for overhead <br />utilities. <br />Photo 4 (left) — Black <br />locust #52 had been <br />approximately 80% <br />girdled. Five dead trees <br />near #52 had been <br />completely girdled. <br />Suitability for Preservation <br />Before evaluating the impacts that will occur during development, it is important to <br />consider the quality of the tree resource itself, and the potential for individual trees to <br />function well over an extended length of time. Trees that are preserved on development <br />sites must be carefully selected to provide greater assurance they survive development <br />impacts, adapt to a new environment, and perform well in the landscape. <br />Our goal is to identify trees that have the potential for long -term health, structural stability <br />and longevity. Evaluation of suitability for preservation considers several factors: <br />• Tree health <br />Healthy, vigorous trees are better able to tolerate impacts such as root injury, <br />demolition of existing structures, changes in soil grade and moisture, and soil <br />compaction than are non - vigorous trees. For instance English walnut #43 is <br />dead and should be removed regardless of construction plans. <br />