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Preliminary Arborist Report 536 St. John Street, Pleasanton June 20, 2016 Page 8 Preliminary Tree Preservation Guidelines The following recommendations will help reduce impacts to trees from development and maintain and improve their health and vitality through the clearing, grading and construction phases. Design recommendations 1. Project plans affecting the trees shall be reviewed by the Consulting Arborist with regard to tree impacts. These include, but are not limited to, demolition plans, site plans, improvement plans, utility and drainage plans, grading plans and landscape and irrigation plans. 2. A Tree Protection Zone shall be established around each tree to be preserved. Modesto ash #51 has a Tree Protection Zone of a circle with a radius of 10 feet. No grading, excavation, construction or storage of materials shall occur within that zone without approval of the Consulting Arborist. 3. Include trees to be preserved and Tree Protection Zones (TPZs) on all construction plans. 4. No underground services including utilities, sub - drains, water or sewer shall be placed in the Tree Protection Zone. 5. Irrigation systems must be designed so that no trenching will occur within the Tree Protection Zone. 6. As trees withdraw water from the soil, expansive soils may shrink within the root area. Therefore, foundations, footings and pavements on expansive soils near trees should be designed to withstand differential displacement. 7. Ensure adequate but not excessive water is supplied to trees; in most cases occasional irrigation will be required. Avoid directing runoff toward trees. Pre - construction treatments and recommendations 1. Tree(s) to be removed that have branches extending into the canopy of tree(s) to remain must be removed by a qualified arborist and not by construction contractors. The qualified arborist shall remove the tree in a manner that causes no damage to the tree(s) and understory to remain. Tree stumps shall be ground 12" below ground surface. 2. All tree work shall comply with the Migratory Bird Treaty Act as well as California Fish and Wildlife code 3503 & 3503.5 to not disturb nesting birds. Tree pruning and removal should be scheduled outside of the breeding season to avoid scheduling delays. Breeding bird surveys should be conducted prior to tree work. Qualified biologists should be involved in establishing work buffers for active nests. 3. Prune trees to be preserved to clean the crown of dead branches 1" and larger in diameter, raise canopies as needed for construction activities. All pruning shall be done by a State of California Licensed Tree Contractor (C61/D49). All pruning shall be done by Certified Arborist or Certified Tree Worker in accordance with the Best Management Practices for Pruning (international Society of Arboriculture, 2002) and adhere to the most recent editions of the American National Standard for Tree Care Operations (Z133.1) and Pruning (A300). The Consulting Arborist will provide pruning specifications prior to site demolition. Branches extending into the work area that can remain following demolition shall be tied back and protected from damage.