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HORTICULTURE I ARBORICULTURE I URBAN ORESTRY September 12, 2015 Mr. TimQui2nn HORT SCIENCE Greenbrlar Homes Communities 43160 Osgood Road Fremont CA 94539 Subject: Tree age Lund Ranch II Dear Mr. Quinn: During review of the development application for the subject project, a question about the age of some of the trees arose. You provided a list of the trees(Table 1, page 2) for my review. You asked that I comment on this issue. The subject trees are located on a slope south of the old residence and southeast of the barn. Four species are present,of which valley oak(Quercus lobate)is native to the Pleasanton area. Calif. black walnut(Juglans hindsir)and black locust(Robinia pseudoacacia) can be considered naturalized in the area. Olive(Olea europaea) is planted as an omamental tree but was likely installed at Lund Ranch as a source of fruit and oil. The four species grow and mature at different rates. When compared to other trees at Lund Ranch, the olives in this area are about the same size as olives elsewhere on the site. Calif. black walnut, black locust and valley oak trees in this area, however, are smaller than other trees at the site. For example, near the residence are black locusts #105 and 106 which are much larger than trees#308 and 309. Similarly the majority of Calif. black walnuts and valley oaks at Lund are larger than the trees in this area. Some walnuts and oaks are twice as large. The size distribution suggests that the olives in this area were planted at the same time as the other olives on the site. The black walnuts, black locusts and valley oaks were not and may have seeded into the area after the olives were installed. Given my observations trees in this area, I believe the subject trees are less than 100 years old and perhaps as young as 60 or 70 years. Please feel free to contact me with any questions. I look forward to hearing from you. Sincerely, James R. Clark, Ph.D. Vice President HortSdence,Inc. I 325 Ray Street I Pleasanton,CA 94566 phone 925.484.0211 I fax 925.484.50961 www.hortscience.corn