5_Exhibits A-C - Laserfiche WebLink

Updated Arborist Report HortScience I Bartlett Consulting Sarvana Chilla, 3987 Stanley Page 5 Each tree was rated for suitability for preservation based upon its age, health, structural condition and ability to safely coexist within a development environment(see Tree Assessment in Exhibits and Table 2). We consider trees with high suitability for preservation to be the best candidates for preservation. We do not recommend retention of trees with poor suitability for preservation in areas where people or property will be present. Retention of trees with moderate suitability for preservation depends upon the intensity of proposed site changes. Table 2. Tree suitability for preservation 3987 Stanley, Pleasanton, CA Common Name Suitability for Preservation Total Low Moderate High California black walnut - 1 - 1 Crape Myrtle 1 - - 1 Glossy privet - 1 - 1 Italian alder - 1 - 1 Lemon - - 1 1 Plum 3 - - 3 Sweetgum - - 1 1 Valley oak - - 2 2 Windmill palm - - 8 8 Total 4 3 12 19 Evaluation of Impacts In evaluating the potential impact to trees, I reviewed the Site Plans prepared by Ken McCoy dated September 15, 2018, Utility, Drainage and Grading Plans by Ken McCoy dated September 2017 were included. The proposed project would construct three new buildings, adjoining sidewalks and a driveway along the eastern portion of the property. Surveyed tree trunk locations were included on Topography Plan prepared by Pacific Land Surveys dated November 2016. Using the proposed plans, potential impacts from construction were estimated for each tree. The most significant impact to the trees would occur as a result of the construction of building pads. Trees#2-7 are within the construction envelope of building#1. Trees#8 and 9 are within the construction envelope of building#2. These trees would not likely survive and I recommend removal. The only tree impacted by the construction of new buildings that qualifies as a Heritage Tree was plum tree#6. Tree#1 was off-site in front of the house and 2' east of the driveway. The canopy extended over the property by 3' and the new driveway would be within the dripline of the tree. The driveway is to be installed 5'from the tree. The excavation for the new driveway may involve additional impacts imposed on the tree roots and the canopy. Tree#18 was located on the eastern property line. The canopy extended over the property by 31' and the new driveway would be within the dripline of the tree. The excavation for the new driveway will involve significant impacts imposed on the tree roots as well as the canopy of the tree. This tree qualifies as a Heritage Tree. The latest plans indicated that a gravel driveway is not always appropriate for retention. This is particularly true when indigenous species are displaced. The California Invasive Plant Inventory Database (http://www.cal-ipc.org/paf/) lists species identified as being invasive. Pleasanton is part of the Central West Floristic Province. There were no species on this site found on the invasive plant inventory list.