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Tree Report. December 7, 2020. <br />Hidden Canyon (Lester property). Ponderosa Homes. <br />Coast live oak was the most frequently <br />occurring species with 91 trees. Coast live <br />oak was the dominant tree in the site's <br />native woodlands (Photo 1 ). Trees ranged <br />in development from young to mature. <br />Approximately 33% of coast live oaks had <br />2 or more trunks that arose low on the <br />trunk. Trunk diameters ranged from 6" to <br />33". The largest oaks were #3 and 42 with <br />diameters of 33". Tree #141 had trunks of <br />29" and 27". <br />Photo 1. Looking SW. at mature coast <br />live oak #3. <br />HortScience I Bartlett Consulting <br />Page 3 <br />Condition of coast live oaks varied widely. Twenty-two (22) trees were in poor condition, <br />found almost exclusively along Dublin Canyon Road near Canyon Meadows Drive. <br />Trees in this location were below energized power lines and had been topped to provide <br />clearance. Thirty-nine (39) trees were in fair condition while another 39 were good. Eight <br />(8) coast live oaks (#3, 15, 33, 34, 46, 64, 110, 135) were in excellent condition. The <br />factor most associated with varying condition was overall form and structure, often <br />associated with crowding. Of the trees in excellent condition #3 was 33" and mature in <br />development while the others were semi-mature in development. <br />Fifty-four (54) Calif. bays were also <br />present, associated with oak woodland. <br />Bays were concentrated in the area south <br />of the residences and along Dublin Canyon <br />Road. Trunk diameter ranged from 6" to <br />65". Bay #107 was 65" and in poor <br />condition while #171 had trunks of 38", 24", <br />22", 19", and 15" and was in fair condition. <br />Most bays had more than one trunk <br />originating near the ground, often due to <br />sprouting from a removed or failed tree. <br />Condition of bays varied from poor (15 <br />trees) to fair (30 trees) to good (#16, 35, <br />41, 105, 113, 137, 162, 195). Bay#126 <br />was 7" in diameter and in excellent <br />condition. Factors affecting condition of <br />Calif. bays included presence of overhead <br />power lines, poor form and structure and <br />the presence of decay (on mature trees). <br />Photo 2. Calif. bay #107 was 65" in <br />diameter but in poor condition. <br />Fourteen (14) tree of heaven were present, concentrated near the proposed East Bay <br />Regional Park District parking area. Trees were generally mature in development with <br />trunk diameters that ranged from 7" to 24" (tree #158). Tree condition ranged from poor <br />(6 trees) to fair (6) to good (#157, 163).