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04 ATTACHMENT 6
City of Pleasanton
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CITY CLERK
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AGENDA PACKETS
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2021
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081721
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04 ATTACHMENT 6
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8/12/2021 4:19:24 PM
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CITY CLERK
CITY CLERK - TYPE
AGENDA REPORT
DOCUMENT DATE
8/17/2021
DESTRUCT DATE
15Y
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04
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35570 Palomares Rd. <br />Castro Valley CA 94552 <br />PHONE: (510) 538-6000 <br />FAX: (510) 538-6001 <br />E-MAIL: tyoung@dryadllc.com <br />WEB SITE: www.dryadllc.com <br />Dryad, LLC <br />September 15, 2020 <br />Torrey Young, Dryad, LLC <br />19053-20078 Resurrection Greek Orthodox Church <br />Site: Dublin Canyon Rd., north of Laurel Creek Dr. <br />Page 16 of 20 <br /> <br />ii. As it is not possible to determine from which trees the roots originate, handle all encountered <br />roots by following the TPG as closely as possible. <br />iii. Limited, miscellaneous excavation (outside of the primary trench): <br />a. When roots are encountered over 1” in diameter, prune cleanly and cover with an absorbent <br />material and keep the material and adjacent soil moist until backfilled (refer to TPG). <br />C. Install protective fencing, surrounding each/all trees to be retained, as described below and in the <br />TPG. <br />i. Fencing shall be 6’ chain-link with posts embedded directly into the soil. <br />ii. Trees with overlapping canopies can be grouped for fencing purposes. <br />D. Mulch: Install organic mulch to a settled depth of 4-6 inches within the protective fencing and <br />throughout the dripline areas surrounding all trees to be retained wherever excavation will not occur. <br />E. Tree Protection Zone (TPZ; fenced area): <br />i. Do not allow vehicles, equipment, pedestrian traffic, building materials, debris storage, or <br />disposal of phytotoxic materials inside of the fenced-off areas (TPZ). <br /> <br /> <br /> <br /> <br /> <br />GENERAL CONSTRUCTION SITE TREE PRESERVATION GUIDELINES8 <br />(Not site or entity-specific) <br /> <br />1. Tree Protection ZoneJ: <br />a. The Tree Protection Zone (TPZ) should consist of the largest possible area surrounding trees to be <br />preserved that can remain undisturbed. Ideally, an area of 1.5 times the longest dripline radius <br />(measured from the trunk). Alternatively, follow the TPZ guidelines as described in the most recent <br />version of current industry standards and best management practices publicationsK. The TPZ can be <br />continuous for trees with overlapping driplines. <br />b. Surround the TPZ with protective fencing. <br />i. Fencing should consist of chain link, at least 6 feet in height, surrounding the perimeter of the TPZ <br />designated distance or beyond. <br />ii. Anchor fence posts into the soil (i.e., do not use portable footings). <br />iii. Protective fencing should remain in place until all grading and construction is complete. <br />c. Do not allow vehicles, equipment, pedestrian traffic, building materials, debris storage, or disposal of <br />phytotoxicL materials inside of the fenced-off areas (TPZ). <br />2. MulchingM and irrigation: <br />a. Soil moisture: <br />i. Determine the status of soil moisture to a depth of 18-24” below grade within the dripline of all <br />(each) trees to be preserved, via tensiometer, granular matrix sensor or manual soil probing. <br />ii. Irrigate as/if necessary, via slow-application (drip) irrigation, to achieve approximately field capacityN <br />to a depth of 12-18”. <br />b. Mulch: Cover exposed soil within all TPZ's with an organic mulch to a settled depth of no less than 3-4 <br />inches. <br />3. Excavation, root pruning & repair: <br />a. Excavation and root pruning should be performed by a Tree Worker currently certified by the <br />International Society of Arboriculture (ISA). Excavation and root pruning should be directly supervised <br />by an arborist currently credentialed as at least one of the following: <br />i. Certified Arborist by the ISA, <br />ii. Board Certified Master Arborist by the ISA, <br />iii. Registered Consulting Arborist by the American Society of Consulting Arborists (ASCA). <br />b. Determine and mark (marking paint and stakes) the outside edge (towards trees) of required <br />excavation, and adjacent to/surrounding any excavations within an area 1.5 times the dripline radius of <br />trees to be preserved (or as large an area as feasible). <br /> <br />8 © Copyright Dryad, LLC, 2020
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