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Tree Report. December 7, 2020. HortScience I Bartlett Consulting
<br />Page 6 Hidden Canyon (Lester property). Ponderosa Homes.
<br />• Species invasiveness
<br />Species which spread across a site and displace desired vegetation are not
<br />always appropriate for retention. This is particularly true when indigenous
<br />species are displaced. The California Invasive Plant Inventory Database
<br />(www.cal-i pc.org) lists species identified as having being invasive. Pleasanton is
<br />part of the Central West Floristic Province. Species identified as invasive that
<br />were present at Hidden Canyon include tree of heaven and Mexican fan palm.
<br />Tree condition (health and structure) is the starting point for assessing suitability for
<br />preservation. In addition, suitability for preservation considers species response to
<br />impacts and invasiveness.
<br />Each tree was rated for suitability for preservation based upon its age, health, structural
<br />condition and ability to safely coexist within a development environment (Table 2).
<br />Table 2. Tree suitability for preservation. Hidden Canyon. Pleasanton CA.
<br />High
<br />Moderate
<br />Low
<br />Trees in good condition that have the potential for longevity at the
<br />site. Twelve (12) trees were rated as having high suitability for
<br />preservation: coast live oak #3, 15, 33, 34, 46, 64, 110, 135; valley
<br />oak #108, bigleaf maple #114, Calif. #126, and Calif. incense cedar
<br />#85.
<br />Trees in fair health and/or possessing structural defects that may be
<br />abated with treatment. Trees in this category require more intense
<br />management and monitoring, and may have shorter life-spans than
<br />those in the "high" category. Eighty-one (81) trees were rated as
<br />having moderate suitability for preservation including: 50 coast live
<br />oak, 9 Calif. bay, bigleaf maple #29, 133, 166, 168; Calif. black
<br />walnut #11, 13, 24; elderberry #47, 49, 81; valley oak #53, 54; apple
<br />#70, 75; English walnut #77, euonymus #71, loquat #76, Monterey
<br />cypress #80, Monterey pine #72, silk tree #69, apricot #73, black
<br />locust #87 and blue gum #56.
<br />Trees in poor health or possessing significant defects in structure
<br />that cannot be abated with treatment. These trees can be expected
<br />to decline regardless of management. The species or individual tree
<br />may possess either characteristics that are undesirable in landscape
<br />settings or be unsuited for use areas. One hundred fifteen (115)
<br />trees were rated as having low suitability for preservation including :
<br />44 Calif. bay, 34 coast live oak, 14 tree of heaven, bigleaf maple
<br />#86, 136, 164, 167, 169, 176; Calif. black walnut #58, 59, 60, 61;
<br />blue gum #39, 40; Calif. buckeye #197, 203; elderberry #82, 83;
<br />apple #84, Calif. incense cedar #7 4, fig #78, Mexican fan palm #55,
<br />Scots pine #79, valley oak #18, and willow #65.
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