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35570 Palomares Rd. Castro Valley CA 94552 PHONE: (510) 538-6000 FAX: (510) 538-6001 E-MAIL: tyoung@dryadllc.com WEB SITE: www.dryadllc.com Dryad, LLC September 15, 2020 Torrey Young, Dryad, LLC 19053-20078 Resurrection Greek Orthodox Church Site: Dublin Canyon Rd., north of Laurel Creek Dr. Page 16 of 20 ii. As it is not possible to determine from which trees the roots originate, handle all encountered roots by following the TPG as closely as possible. iii. Limited, miscellaneous excavation (outside of the primary trench): a. When roots are encountered over 1” in diameter, prune cleanly and cover with an absorbent material and keep the material and adjacent soil moist until backfilled (refer to TPG). C. Install protective fencing, surrounding each/all trees to be retained, as described below and in the TPG. i. Fencing shall be 6’ chain-link with posts embedded directly into the soil. ii. Trees with overlapping canopies can be grouped for fencing purposes. D. Mulch: Install organic mulch to a settled depth of 4-6 inches within the protective fencing and throughout the dripline areas surrounding all trees to be retained wherever excavation will not occur. E. Tree Protection Zone (TPZ; fenced area): i. Do not allow vehicles, equipment, pedestrian traffic, building materials, debris storage, or disposal of phytotoxic materials inside of the fenced-off areas (TPZ).    GENERAL CONSTRUCTION SITE TREE PRESERVATION GUIDELINES8 (Not site or entity-specific) 1. Tree Protection ZoneJ: a. The Tree Protection Zone (TPZ) should consist of the largest possible area surrounding trees to be preserved that can remain undisturbed. Ideally, an area of 1.5 times the longest dripline radius (measured from the trunk). Alternatively, follow the TPZ guidelines as described in the most recent version of current industry standards and best management practices publicationsK. The TPZ can be continuous for trees with overlapping driplines. b. Surround the TPZ with protective fencing. i. Fencing should consist of chain link, at least 6 feet in height, surrounding the perimeter of the TPZ designated distance or beyond. ii. Anchor fence posts into the soil (i.e., do not use portable footings). iii. Protective fencing should remain in place until all grading and construction is complete. c. Do not allow vehicles, equipment, pedestrian traffic, building materials, debris storage, or disposal of phytotoxicL materials inside of the fenced-off areas (TPZ). 2. MulchingM and irrigation: a. Soil moisture: i. Determine the status of soil moisture to a depth of 18-24” below grade within the dripline of all (each) trees to be preserved, via tensiometer, granular matrix sensor or manual soil probing. ii. Irrigate as/if necessary, via slow-application (drip) irrigation, to achieve approximately field capacityN to a depth of 12-18”. b. Mulch: Cover exposed soil within all TPZ's with an organic mulch to a settled depth of no less than 3-4 inches. 3. Excavation, root pruning & repair: a. Excavation and root pruning should be performed by a Tree Worker currently certified by the International Society of Arboriculture (ISA). Excavation and root pruning should be directly supervised by an arborist currently credentialed as at least one of the following: i. Certified Arborist by the ISA, ii. Board Certified Master Arborist by the ISA, iii. Registered Consulting Arborist by the American Society of Consulting Arborists (ASCA). b. Determine and mark (marking paint and stakes) the outside edge (towards trees) of required excavation, and adjacent to/surrounding any excavations within an area 1.5 times the dripline radius of trees to be preserved (or as large an area as feasible). 8 © Copyright Dryad, LLC, 2020