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David L. Bobby, Registered ConsultingArhorisr"' July 8, 2013 <br /> 5.0 REVIEW OF POTENTIAL IMPACTS <br /> My review of Sheet SP.1 reveals that by implementation of the proposed design, tree #11 <br /> will require removal, and #9 and 10 would be severely impacted. <br /> Tree #11 is a small, non-heritage tulip tree that has a dying top (nearly half of the tree), <br /> and its removal is appropriate regardless of the proposed project. <br /> Trees #9 and 10 are coast redwoods and considered "heritage trees," #9 for its trunk <br /> diameter and height, and #10 only for its height. The proposed drive aisle for the future <br /> car wash would excavate into their root zones, and potentially within only a few feet of the <br /> trunks when considering overexcavation to form and pour the new drive. If this impact <br /> was to occur. the trees would become exposed to premature decline and possible uprooting <br /> (due to the loss of numerous buttress roots serving to anchor the trees into the ground). <br /> Should #9 and/or 10 be retained with a reasonable degree of assurance for their survival <br /> and stability, I recommend the drive aisle is setback by at least nine feet from the base of <br /> their trunks, and overexcavation beyond the proposed drive aisle edge is reduced to 12 <br /> inches. Any additional distance from the trunks would only decrease the risk of potential <br /> impacts. <br /> Additional measures are presented in Section 6.0 of this report, and should be carefully <br /> followed to achieve adequate protection of trees to be retained. <br /> 3192 Santa Rita Road, Pleasanton Page 4 of 10 <br /> Mr.Joe Nguyen, .4S1 Consulting <br />