SR 06:242 - Laserfiche WebLink

Preliminary Tree Report, 3459 Foothill Rd. Pleasanton April 2. 2004 I HortScience, Inc, Page 3 I There were many impressive native trees on the site. Oaks #1, 5, 9. 10, 15, 27 are examples of beautiful, healthy trees greater than 30" in diameter that line the existing drive west of Old Foothill Rd (Fig. 1). Visually the most impressive tree on the site was tree #86. This 72" California sycamore stands alone in an open meadow with excellent form and structure. It is a unique specimen within the region (Fig, 2). I I I Fig. 1 (above): Tree #15, a large and healthy Heritage coast live oak growing at the edge of a small stream. Fig. 2 (right): Tree # 86 is a magnificent specimen of a Western sycamore, I Unfortunately there are also several mature oaks in poor condition. Structural failure due to decay was evident in seven of the large valley oaks (#16, 17. 90, 91, 93, 123, 126) (Fig. 3). The largest tree on the site, a 79" valley oak (tree #90). had a large cavity and extensive decay as a result of the failure of a major portion of the crown (Fig, 4). Trees with significant amounts of decay and structural failure were rated in poor condition. They are likely to fail again, and could cause injury or damage to people or property within their fall zone, I I Fig. 3: Valley oak #17, although attractive in form, is structurally unstable because of extensive decay in the trunk. Fig. 4: Tree #90, a 79" valley oak, is the largest diameter tree on the site. The large cavity and extensive decay (arrow) make it inappropriate for preservation where people or property could be harmed,