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May 4,2017 d� Torrey Young.Dryad,LLC 17022-20093 M.I.P.Renovations-Horne fmprovernent Pros Site:3552 Yellowstone Ct.Pleasanton.CA GENERAL CONSTRUCTION SITE TREE PRESERVATION GUIDEUNES (not site or entity-specific) 1. Tree Protection Zonec: 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 resent version of current industry standards and best management practices publications". The TPZ can be continuous for trees with overlapping dripfines. 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 phytotoxic'materials inside of the fenced-off areas(TPZ). 2. Mulching'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 slaw-appticalion(drip)irrigation,to achieve approximately field capacity" to a depth of 12-18'. b. Mulch: Cover exposed soil within aft TPZ's with an organic mulch to a settled depth of no less than 3-4 inches. 3. Excavation, root pruning&repair: a. 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 at large an area as feasible). b. Excavate a trench approximately 6-17 beyond the area to be disturbed(towards tree),or where roots have been damaged,to a depth of at least 18", by hand excavation`or with specialized hydraulicM or pneumatic"equipment. i. Wherever possible,relocate excavations or tunnel beneath encountered roots>1"in diameter. ii. Cut encountered roots cleanly with hand pruners or power saw. Avoid tearing,dislodging of bark (or epidermis)or otherwise disturbing that portion of the root(s)to remain. iii. Immediately back-fill with soil to cover,and moisten. iv. if backfilling cannot be completed immediately.cover exposed roots with several layers of untreated burlap(or other similar absorbent material)or sand, mulch or soil and keep moist until permanent backfilling can be completed. v. Excavation and root pruning should be performed by a Tree Worker currently certified by the International Society of Arboriculture(ISA). vi. Excavation and root pruning should be directly supervised by an arborist currently credentialed as at least one of the following: (1) Certified Arborist by the ISA, (2) Board Certified Master Arborist by the ISA, (3) Registered Consulting Arborist by the American Society of Consulting Arborists(ASCA) c. Future excavations within the TPZ: i. If possible,relocate any future excavations(irrigation, landscape features,etc.)outside the TPZ and perimeter of previously pruned roots. ii. If encroachment is required within the TPZ, endeavor to avoid pruning roots by tunneling beneath. 4. If relocation or tunneling is not possible, handle arj required root pruning as previously described. Tree care and maintenance work: (pruning,cabling/bracing , root pruning, etc.) a. Tree pruning: i. Avoid pruning that removes green foliage or live wood immediately before, during or within 1-2 years after construction. ii. Prune to remove large deadwood only(cleaning pruning),or the minimum required for clearance purposes,in accordance with current pruning standards". 35570 Patomares Rd. PONE, (510)538-5000 +. ; 4 LLC Castro Valley CA 94552 Fax (510}5386001 r� d E-MA I. tyoun9 dryadUc.com Page 10 of 13 WEB 5t7E www.dryadUc..com