|
Arborist Report—Gudaitis Residence, Pleasanton Page 9
<br /> January 19, 2021
<br /> Tree Preservation Guidelines
<br /> The goal of tree preservation is not merely tree survival during development but maintenance of
<br /> tree health and beauty for many years. Trees retained on sites that are either subject to extensive
<br /> injury during construction or are inadequately maintained become a liability rather than an asset.
<br /> The response of individual trees will depend on the amount of excavation and grading, the care
<br /> with which demolition is undertaken, and the construction methods. Coordinating any construction
<br /> activity inside the TREE PROTECTION ZONE can minimize these impacts.
<br /> The following recommendations will help reduce impacts to the remaining trees from development
<br /> and maintain and improve their health and vitality through the clearing, grading and construction
<br /> phases.
<br /> Tree Protection Zone
<br /> 1. A TREE PROTECTION ZONE shall be the dripline of each tree, or the combined dripline of a
<br /> group of trees.
<br /> a. Fence all trees to be retained to completely enclose the TREE PROTECTION ZONE prior to
<br /> demolition, grubbing or grading. Fences shall be 6 ft. chain link or equivalent as approved
<br /> by the City.
<br /> b. Fences must be installed prior to beginning demolition and must remain until construction
<br /> is complete.
<br /> c. No grading, excavation, construction or storage or dumping of materials shall occur within
<br /> the TREE PROTECTION ZONE.
<br /> d. No underground services including utilities, sub-drains, water or sewer shall be placed in
<br /> the TREE PROTECTION ZONE.
<br /> Design recommendations
<br /> 1. All plans affecting trees shall be reviewed by the Consulting Arborist with regard to tree
<br /> impacts. These include, but are not limited to, demolition plans, grading plans, drainage plans,
<br /> utility plans, and landscape and irrigation plans.
<br /> 2. TREE PROTECTION ZONE shall be the dripline (or combined driplines)of each tree. No grading,
<br /> excavation, construction or storage of materials shall occur within that zone. No underground
<br /> services including utilities, sub-drains, water or sewer shall be placed in the TREE PROTECTION
<br /> ZONE.
<br /> 3. Irrigation systems must be designed so that no trenching severs roots larger than 1" in
<br /> diameter will occur within the TREE PROTECTION ZONE.
<br /> 4. Consider the vertical clearance requirements near trees during design. Avoid designs that
<br /> would require pruning more than 20%of a tree's canopy.
<br /> 5. Tree Preservation Guidelines prepared by the Consulting Arborist, which include
<br /> specifications for tree protection during demolition and construction, should be included on all
<br /> plans.
<br /> 6. Any herbicides placed under paving materials must be safe for use around trees and labeled
<br /> for that use.
<br /> 7. Do not lime the subsoil within 50' of any tree. Lime is toxic to tree roots.
<br /> 8. As trees withdraw water from the soil, expansive soils may shrink within the root area.
<br /> Therefore, foundations, footings and pavements on expansive soils near trees should be
<br /> designed to withstand differential displacement.
<br /> 9. Ensure adequate but not excessive water is supplied to trees; in most cases occasional
<br /> irrigation will be required.Avoid directing runoff toward trees
<br /> Hort-Science Bartlett Consulting; Divisions of The F.A. Bartlett Tree Expert Company
<br /> demolition and grading, I recommend monitoring of impacts during construction. The
<br /> Project Arborist may recommend removal based on the observations in the field so that it
<br /> does not become a safety hazard.
<br /> Ho+i.Science Bartlett Consulting.Divisions of The F.A. Bartlett Tree Expert Company
<br /> 11
<br /> t .. ,.$ , ,...",,,t1:,. -4, ' '?r!'• '. .#e di •uj' 1; 0:11 11
<br /> tr... za. cli• ,.,... . 126* e:t4,104.,- z FM ,::2.510 6.K.44ve ..r• „n•et.' .r---3 7-
<br /> A.
<br /> L.0 16.o6• •
<br /> "- ,...iaraf--LEL. I i-LI.ZliCe ottD•14' '.:01$01"-
<br /> •* fl
<br /> "Z S A f 3 . OMOM4 44
<br /> CD
<br /> . .
<br /> i
<br /> Ser
<br /> . V
<br /> •C 4- . ... .
<br /> 41,*-ni t 1101 1444 t ts k t rii -' .c:;.0 PAR C E i 7 ; _1
<br /> 4..'•
<br /> PARCEL P.1
<br /> I Cr.510 ...
<br /> k W4 ill
<br /> •f:
<br /> y Its
<br /> PM
<br /> Ii; 1
<br /> rA RiIi_ E3 1j 1. ..),, -"TT.)"NI ;:.'.f7.•![....? o , 1 i.1 .. .. 5
<br /> t V Vi
<br /> • )
<br /> RECOrIDERS MEMO ---.}
<br /> LENBILITY FOR NICPORt,ING MD
<br /> CPPY1')G tifh•APSFACrOry Pi .1 POHTION
<br /> nt 71.IC I 1-.. t III. 1,1 ll' ,, ..• ",-,-,...•... ft
<br />
|