Item 3 - Exhibit 06 - Consulting Arborist ReportASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 / drtree@sbcglobal.net
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture
Walter Levison 2017 All Rights Reserved
Assessment of Nineteen (19) Protected and Non-Protected Size Trees
at and adjacent to
400 Carlton Avenue
Los Gatos, California
Prepared for:
Mr. Sean Mullin, Associate Planner
Town of Los Gatos Community Development Department
110 E. Main Street
Los Gatos, CA 95030
Field Visit:
Walter Levison, Contract Town Arborist (CTA)
2/10/2017
Report by CTA
Version: 2/23/2017
EXHIBIT 6
ASCA Registered Consulting Arborist #401 / ISA Tree Risk Assessment Qualified / ISA Certified Arborist #WC-3172 cell (415) 203-0990 / drtree@sbcglobal.net
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture
Walter Levison 2017 All Rights Reserved
Table of Contents
1.0 Summary __________________________________________________________________________ 3
2.0 Assignment & Background ___________________________________________________________ 7
3.0 Tree Location & Protection Fence Map ________________________________________________ 8
4.0 Town of Los Gatos – What Trees are Protected? ________________________________________ 10
5.0 Recommendations _________________________________________________________________ 11
6.0 Tree Protection and Maintenance Directions per Town Code ______________________________ 17
7.0 Tree Replacement Standards – Los Gatos Town Code ___________________________________ 21
8.0 Author’s Qualifications _____________________________________________________________ 23
9.0 Assumptions and Limiting Conditions _________________________________________________ 24
10.0 Certification ______________________________________________________________________ 25
11.0 Digital Images ____________________________________________________________________ 25
12.0 Tree Data Table ___________________________________________________________________ 28
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture
Walter Levison 2017 All Rights Reserved
1.0 Summary
a.Matrix style overview of protected-size trees (non-exempt species, 4-inches diameter at 4.5 feet above grade). Below, the CTA has outlined expected
impacts to each tree, along with suggestions for adjustments to the plan set (if applicable) that will optimize tree survival over the long term. Removal
trees, if any, are noted as such in the matrix.
The CTA calculated the appraised value of each tree, which can be used as a tool for determining the proper security bond amount to have the applicant
post with the Town as a hedge against site plan-related tree damages (if applicable). Appraised values can also be used to determine damage fees if trees
are determined during or after construction to have been damaged such that mitigation is required.
Mitigation replacement rate and size is noted for each tree in the case that removal or damage to trees occurs.
Note: Only trees within relatively close proximity of proposed work as outlined in the applicant’s set of plan sheets (e.g. trunks located between zero and
20 linear feet of proposed work) are included in this initial tree study.
Table 1.0(a) (REFER TO THE CTA’S TREE MAP MARKUP WHEN REVIEWING THIS MATRIX)
Line
Number
Tree
Tag
Number
Common Name
Large
Protected
Tree
(LPT)?
Appraised
Value
Site plan changes or restrictions required to
reduce impacts to “less than significant”
Replacement
Rate Per
Canopy Lost
Replacement
Size Tree
1 1 European olive
(non-
protected
size tree)
n/a n/a n/a
2 2 European olive $1,230. (To be removed per plan). 3 24” box
3 3 (non-protected
size tree) n/a n/a
(non-
protected
size tree)
n/a
4 4 (non-protected
size tree) n/a n/a
(non-
protected
size tree)
n/a
5 5 European olive $2,830.
Keep chain link RPZ fencing erected as far as
possible Eastward offset from trunk. Irrigate
weekly.
3 24” box
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture
Walter Levison 2017 All Rights Reserved
Line
Number
Tree
Tag
Number
Common Name
Large
Protected
Tree
(LPT)?
Appraised
Value
Site plan changes or restrictions required to
reduce impacts to “less than significant”
Replacement
Rate Per
Canopy Lost
Replacement
Size Tree
6 6 European olive $3,010.
Keep chain link RPZ fencing erected as far as
possible Eastward offset from trunk. Irrigate
weekly.
3 24” box
7 7 European olive $1,270. Fence per CTA’s tree map in report. Irrigate
weekly. 3 24” box
8 8 (non-protected
size tree) n/a n/a
(non-
protected
size tree)
n/a
9 9 (non-protected
size tree) n/a n/a
(non-
protected
size tree)
n/a
10 10 (non-protected
size tree) n/a n/a
(non-
protected
size tree)
n/a
11 11 European olive $800. (To be removed per plan). 3 24” box
12 12 European olive $1,990.
Limit depth of cut for new walkway base
section excavation to max. 4 to 6 inches below
existing soil grade. Maintain irrigation weekly.
3 24” box
13 13 (non-protected
size tree) n/a n/a
(non-
protected
size tree)
n/a
14 14 Sweetgum
(Street Tree) $2,130.
Limit depth of cut for new sidewalk surfacing to
depth of existing older baserock. Work with a
project arborist to avoid severing roots
measuring 1-inch diameter or larger, within 10
feet of this tree, when replacing baserock and
sidewalk surfacing.
3 24” box
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture
Walter Levison 2017 All Rights Reserved
Line
Number
Tree
Tag
Number
Common Name
Large
Protected
Tree
(LPT)?
Appraised
Value
Site plan changes or restrictions required to
reduce impacts to “less than significant”
Replacement
Rate Per
Canopy Lost
Replacement
Size Tree
15 15
Sweetgum
(Street Tree)
(Possible
removal tree
based on current
condition rating of
‘very poor’)
$770.
Limit depth of cut for new sidewalk surfacing to
depth of existing older baserock. Work with a
project arborist to avoid severing roots
measuring 1-inch diameter or larger, within 10
feet of this tree, when replacing baserock and
sidewalk surfacing.
3 24” box
16 16 Sweetgum
(Street Tree) $1,160.
Limit depth of cut for new sidewalk surfacing to
depth of existing older baserock. Work with a
project arborist to avoid severing roots
measuring 1-inch diameter or larger, within 10
feet of this tree, when replacing baserock and
sidewalk surfacing.
3 24” box
17 17 Sweetgum
(Street Tree) $1,320.
Limit depth of cut for proposed new driveway
apron to depth of existing older baserock
and/or existing surfacing materials. Work with a
project arborist to avoid severing roots
measuring 1-inch diameter or larger, within 10
feet of this tree, when replacing baserock and
sidewalk surfacing.
3 24” box
18 18 Sweetgum
(Street Tree) $3,360.
Limit depth of cut for new sidewalk surfacing to
depth of existing older baserock. Work with a
project arborist to avoid severing roots
measuring 1-inch diameter or larger, within 10
feet of this tree, when replacing baserock and
sidewalk surfacing.
3 24” box
19 19 Deodar cedar $5,700.
Limit depth of scarification of existing asphalt
parking lot to depth of surface asphalt only.
Work with a project arborist if woody roots
measuring 1 inch diameter or greater are
encountered and require severing during
scarification work within approximately 30 to 40
feet of this tree.
4 24” box
2017 Town of Los Gatos In-lieu fee equivalent = $250 per each required 24” box mitigation tree planting not installed on the site.
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
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Summary of tree disposition and tree issues, based on the grading and drainage plan sheet dated 1/17/2017 by Hanna-Brunetti Civil
of Gilroy, California:
•REMOVALS (APPLICANT): Applicant proposes removal of trees #1, 2, 3, 4, 8, 10, and 11.
Only removal trees #2 and #11 are considered protected trees. The other five (5) removal trees are of non-protected size.
•REMOVALS (CTA): The CTA suggests removing street tree #15 due to very poor overall condition rating.
•IMPACTED TREES: The CTA expects the following protected-size survey trees to be impacted by proposed work:
o West Side of Building: Olive specimens #5, 6, and 7 need to be fenced off as far as possible from trunks, and irrigated regularly, to avoid
loss of vigor during proposed new building footprint work.
o North Walkway: Olive #12 may be damaged by proposed new walkway cuts running in an East-West orientation, unless base rock excavation
depth is restricted to only a few inches beneath existing soil surface grade in the area just South of the trunk of this tree.
o Sidewalk Carleton Avenue: Proposed sidewalk work along Carleton Avenue may cause significant root loss and damage to sweetgum street
trees #14, 15, and 16. It is suggested that this demolition and renovation work be restricted to only surface material replacement, with no
adulteration of the older baserock beneath the surface materials, within 10 feet of these trees.
o Driveway Aprons: New driveway apron work at the Carlton entrance and the Jo Drive entrance may cause significant root loss to sweetgum
street trees #17 and #18 if depth of cut is not restricted. It is suggested that new apron work cut depths be restricted to the depth of existing
base rock and/or existing surface materials.
o Sidewalk Jo Drive: Although not shown on the proposed plans, sidewalk heave near sweetgum #18 on Jo Drive may require removal and
replacement of slabs in that vicinity. This work would necessarily have a severe negative impact on the tree, unless work is limited to
replacement of the slab only. Use of rubber pavers may be a solution to this problem, as rubber can deform as roots continue to expand
upward. See recommendations section for images of rubber slabs used as sidewalk surfacing near mature trees.
o Parking Lot Scarification: The plans call for scarification and replacement of the existing asphalt parking lot area North of cedar #19. The CTA
measured woody root extension damage to the asphalt running radially North of the tree as far as 40 to 50 feet radius. This means that the
proposed scarification area may contain relatively large diameter woody roots connected to cedar #19. If scarification is limited to removal of
the surface materials only, this is fine. If the scarification will include removal of base rock, then there is a high possibility that woody roots will
be damaged or destroyed, which could result in loss of water uptake ability by cedar #19, and loss of vigor (decline in overall condition). The
project team will need to work with a project arborist to determine a feasible course of action which allows for parking lot renovation to occur,
without causing significant damage to tree #19.
o Irrigation Laterals to Sidewalk Plantings: Any irrigation pipe laterals proposed to cut through the sidewalks along Jo Drive and Carleton
Avenue to connect water supply to the proposed new sidewalk planting areas will need to be routed to at least 10 feet offset from the trunks
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
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of all street trees being retained. For pipe installations within 10 feet of a street tree, a compromise will need to be reached between the
contractors and the project arborist whereby piping is routed just under grade, etc. to avoid severe root damage or root loss to the trees.
•LANDSCAPE REPLACEMENT PLANTINGS VS. REMOVALS: The current proposed plan shows replacement tree installations totaling six (6) trees.
Per the Town’s canopy replacement standards as shown above in Table 1.0(a), removal of the two (2) protected-size olives at this site will require at
least six (6) replacement trees of minimum 24” box size. The CTA suggests that the proposed landscape plans be verified as meeting this requirement.
Note also that applicants can provide payment of $250 per each required new replacement tree that is not actually installed on site.
•LANDSCAPE & IRRIGATION PLANS:
The proposed irrigation pipe trenching plan was not available for review at the time of writing. However, a preliminary landscape plan sheet L-2.0
dated 1/17/2017 by David Fox, Landscape Architect, of Los Gatos, California, was available for the CTA’s review.
Per above on page 6, in the item titled “irrigation laterals to sidewalk plantings”, the CTA suggests that the laterals be kept to at least 10 feet offset
from the trunk of any existing tree being retained, and that any piping required to be installed within 10 feet of a tree being retained will need to be
specified as minimal burial to avoid causing severe tree root loss (depths of burial and piping types to be determined at a later date).
b.Security Bonding:
The new 2015 iteration of the Town tree ordinance section 29.10.1000 (c)3 includes wordage that requires that all trees being retained on a development
site need to be appraised for dollar value at the applicant’s expense prior to building or grading permits being issued by the Town. Part ‘f’ of this same tree
ordinance section states that the Town may condition a security bond prior to issuance of a permit, in the sum of $5,000 per each tree being preserved, or
$25,000, whichever is less. The ordinance does not contain wordage as to whether this includes neighbor-owned trees adjacent to construction.
Therefore, the CTA will assume that neighbor-owned trees are included as trees “required to be preserved” (if applicable).
Note that the total appraised value of trees being retained at this site per the CTA’s determination above in table 1.0(a) is approximately $19,000.
Therefore, if applicable, it would be reasonable, based on the actual appraised values of the ten (10) protected-size trees being retained at and adjacent to
this site, for the Town to condition the project approval upon posting of a security bond in the amount of approximately 50% X $19,000 = $9,500. This
would represent a reasonable fraction of the total value of protected-size trees being retained on site.
2.0 Assignment & Background
Walter Levison, Contract Town Arborist (CTA) was directed to tag and assess all Protected Size (4 inch diameter and greater) trees both on the property
proposed for site plan work and (in some cases) adjacent to the site plan area within 10 linear feet of property lines, when proposed work is to occur within
approximately 20 to 25 feet of the tree(s).
Note that “exception” trees not protected under the current Town tree ordinance (e.g. fruit and nut trees <18 inches diameter, and Tasmanian blue gum, red
gum, blackwood acacia, tulip tree, tree of heaven, palms (except Phoenix canariensis), and privet <24 inches diameter, etc.) were not tagged or assessed
by the CTA.
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
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At this site, the CTA included all trees that were within 10 to 15 feet of proposed work, which included street trees along Jo Drive and Carleton Avenue, and
one parking lot cedar near proposed scarification work South of the proposed new building footprint.
On “Hillside” properties (see Hillside map, next page), all eucalyptus species are considered exception trees, and are not protected by Town ordinance
provisions. The Gum Tree Lane project is within the “Hillside Area”.
“Large protected tree” (LPT) as noted in the tree table below in
this report m eans any oak (Quercus), California buckeye
(Aesculus californica), or Pacific madrone (Arbutus menziesii)
which has a 24 inch or greater diameter (75 inch circumference);
or any other species of tree with a 48 inch or greater diam eter (150
inch circumference). Trunk measurement in the case of a multiple
stem tree is the sum of all mainstem diameters.
The author tagged all trees in this study at 5 to 6 feet above grade
using large racetrack shaped tags numbering “1” through “38” as
noted on the tree map below in this report.
3.0 Tree Location & Protection Fence Map
The CTA marked up the applicant’s grading and drainage plan
sheet dated 1/17/2017 by Hanna-Brunetti of Gilroy, California.
The red dashed lines indicate the CTA’s suggested chain link root
protection fence alignment (initial rough), based on available
remnant root zone areas that are protectable (assuming the scope
of site plan work will occur as currently proposed).
Note that the red dashed lines are shown as root zone protection
fence routing around both non-protected size trees and protected size trees being retained.
The project team can choose to ignore protection for non-protected size olives #9 & #13 at their discretion.
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
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Walter Levison 2017 All Rights Reserved
4.0 Town of Los Gatos – What Trees are Protected?
Per the most recent (2015) iteration of the Town of Los Gatos tree ordinance (Town Code Chapter 29 – Zoning Regulations, Article 1), the following
regulations apply to all trees within the Town’s jurisdiction (wordage adjusted):
1.All trees with at least a single mainstem measuring four (4) inches diameter or greater at 4.5 feet above grade are considered “Protected Trees” when
removal relates to any development review.
2.12 inch diameter (18 inch multistem total) trees on developed residential property not currently subject to development review.
3.8 inch diameter (8 inch multistem total) blue oak (Quercus douglasii), black oak (Quercus kellogii), California buckeye (Aesculus californica), and
Pacific madrone (Arbutus menziesii) on developed residential lots not currently subject to development review.
4.8 inch diameter (8 inch multistem total) trees on developed residential property not currently subject to development review, on lots in the designated
Hillside Area per the official Town map.
5.All trees with a single mainstem or sum of multiple mainstems totaling 48 inches diameter or greater at 4.5 feet above grade are considered “Large
Protected Trees” (LPT).
6.All oak species (Quercus spp.), California buckeye (Aesculus californica), and Pacific madrone (Arbutus menziesii) with one or more mainstems
totaling 24 inches diameter or more at 4.5 feet above grade are considered “Large Protected Trees” (LPT).
7.Section 29.10.0965. Prohibitions: A permit is required to prune, trim, cut off, or perform any work, on a single occasion or cumulatively, over a three-
year period, affecting 25% or more of any Protected Tree (including below ground root system).
8.Section 29.10.0965. Prohibitions: A permit is required to prune, trim, or cut any branch or root greater than four (4) inches in diameter of a Large
Protected Tree.
9.Section 29.10.0965. Prohibitions: A permit is required to conduct severe pruning on any protected tree. Severe pruning is defined in section
29.10.0955 as “topping or removal of foliage or significant scaffold limbs or large diameter branches so as to cause permanent damage and/or
disfigurement of a tree, and/or which does not meet specific pruning goals and objectives as set forth in the current version of the International Society
of Arboriculture Best Management Practices-Tree Pruning and ANSI A300-Part 1 Tree, Shrub, and Other Woody Plant Management-Standard
Practices, (Pruning).”
10. Exceptions:
Severe Pruning Exception in Town Code section 29.10.1010(3) “…..except for pollarding of fruitless mulberry (Morus alba) or other species approved
by the Town Arborist….”.
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
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Protected Tree Exceptions:
a.Edible fruit or nut bearing trees less than 18 inches diameter (multistem total or single stem)
b.Acacia melanoxylon (blackwood acacia) less than 24 inches (multistem total or single stem)
c.Liriodendron tulipifera (tulip tree) less than 24 inches (multistem total or single stem)
d.Ailanthus altissima (tree of heaven) less than 24 inches (multistem total or single stem)
e.Eucalyptus globulus (Tasmanian blue gum) less than 24 inches (multistem total or single stem)
f.Eucalyptus camaldulensis (River red gum) less than 24 inches (multistem total or single stem)
g.Other eucalyptus species (E. spp.) not noted above, less than 24 inches (multistem total or single stem)
(REMOVAL O.K. ONLY AT HILLSIDE AREA LOCATIONS PER OFFICIAL TOWN MAP):
www.losgatosca.gov/documentcenter/view/176
h.All palm species (except Phoenix canariensis) less than 24 inches (multistem total or single stem)
i.Ligustrum lucidum (glossy privet) less than 24 inches (multistem total or single stem)
Note that per the exception in part ‘a’ above, fruiting olive trees with stems totaling less than 18 inches are considered non-protected.
5.0 Recommendations
1.Project Arborist (“PA”):
Initial Signoff
It is suggested that a third party ASCA registered consulting arborist or ISA Certified Arborist with good experience with tree protection during
construction be retained by the applicant, to provide pre-project verification that tree protection and maintenance measures outlined in this section of
the arborist report are adhered to. Periodic (e.g. m onthly) inspections and summary reporting, if required as a project condition of approval, are
suggested in order to verif y contractor compliance with tree protection throughout the site plan project. This person will be referred to as the project
arborist (“PA”). The PA should monitor soil moisture within the root protection zones of trees being retained, using a Lincoln soil moisture probe/meter
or equivalent. If required, inspection reports shall be sent to Mr. Sean Mullin, Associate Planner, at smullin@losgatosca.gov
Sample wordage for a condition of approval regarding monitoring of tree protection and tree condition:
“The required protective fencing shall remain in place until final landscaping and inspection of the project. Project arborist approval must be obtained
and documented in a monthly site activity report sent to the Town. A mandatory Monthly Tree Activity Report shall be sent at least once monthly to the
Town planner associated with this project (smullin@losgatosca.gov ) beginning with the initial tree protection verification approval letter”.
The PA should work with the project team on critical areas where tree roots may be damaged or destroyed as a result of new driveway,
walkway, sidewalk, and parking lot work near trees #12, 14, (15 if retained), 16, 17, 18, and #19.
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
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2.Project Team Actions or Clarifications Requested:
i.Tree Removal In-Lieu Fees: (Per the Town tree canopy replacement standard matrix).
The CTA suggests that the project team install a total of at least six (6) on-site 24” box size tree plantings as required by the Town canopy
replacement guidelines.
ii.Tree Removal Permitting:
Removal of protected-size trees #2 and #11 per the site plan shall not occur until the applicant is granted an official Town tree removal permit.
iii.Security Bond:
It is suggested that Town Staff condition this project on
receiving security bond monetary funds from the
applicant in the minimum amount of 50% of the value of
protected-size trees being retained on site, which is
approximately $9,500, as a hedge against potential
decline or death of one or more of the survey trees to
remain in close proximity to the proposed site plan
project. Staff may choose to increase the fee to an
amount above and beyond this minimum recommended
fee.
iv.Plan Adjustments:
a. Street Tree Removal: It is suggested that street tree
#15 be removed due to very poor overall condition. It
is further suggested that the Town waive the
removal fee for this tree.
b.Sidewalk Displacement at Jo Drive: It is suggested
that the team retain a project arborist to work with
the team in replacing the sidewalk just East of tree
#18 where the root system of this sweetgum is
causing vertical displacement of the slabs.
One solution may be to use a vertically-deformable
The current proposed olive plantings and redbud plantings are acceptable as replacement species, as long as the plantings are all of 24" box
size. However, the CTA suggests that species larger than redbud be used as replacements, to replace lost large tree canopy value at parity.
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
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type of slab, such as rubber slab designed for sidewalks, as the new surfacing for this area. See the sample image above right showing a
recent project on which the CTA worked in Palo Alto where rubber paver material was cut to retrofit a buckled walkway near mature large
trees. This material is considered more appropriate than concrete for areas over existing lateral tree root growth, as the rubber can deflect
upward to account for future tree root expansion. Also, the rubber can be reset as necessary to relevel, without having to demolish the
material.
Work with the project arborist to design a solution that minimizes root loss to tree #18.
c.Walkway near olive #12: Restrict all new walkway base section excavation cut depths to a maximum 4 inches below existing soil surface
grade. Raise the new walkway finish elevation as necessary in order to comply with this restriction. Feather out the raised walkway edges
as necessary to reduce trip hazard. See recommendation #9 below for a spec image of a tree-friendly type walkway that requires only
minimal base section excavation.
d.Sidewalk Work at Carleton Avenue: Do not cut below the bottom elevation of the existing older sidewalk slabs on Carleton Avenue, when
working within 10 linear feet of street trees #14, (15 if retained), 16, 17.
Work with the project arborist to find solutions to minimize root loss and root damages to the trees.
e.Apron Work: Limit apron replacement cut depths to the bottom elevations of existing slabs when working within 10 linear feet of street
trees #17 and #18.
f.Parking Lot Scarification: Limit scarification cut depths to surface asphalt removal only, when working within 30 or 40 feet of cedar #19.
If base rock needs to be removed or otherwise modified, then contact the project arborist to work with the project team to minimize root
loss and root damage.
g. Irrigation Laterals Vs. Street Trees: Keep all proposed irrigation pipe laterals to at least 10 linear feet from the trunk edges of street trees
being retained.
For installation of irrigation piping to feed proposed new sidewalk planting areas within 10 feet of trees, use a “no dig” solution such as
hiding black UV resistant poly tubing in groove cuts between sidewalk slabs, etc., as a tree root friendly alternative to standard trenching
and burial.
v.Temporary Construction Period Irrigation: All tree specimens being retained shall be heavily irrigated on a once-weekly basis. Use any means
available to provide irrigation water to trees (see below in this section for details).
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
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3.Trunk Buffer Wrap Type III Protection:
Prior to demolition commencement, install a trunk buffer around the lowermost 8 to 10 feet of the trunks of all
protected trees being retained (trees #5, 6, 7, 12, 14, (15 if retained), 16, 17, 18, 19).
Wrap approximately 10 to 15 wraps of orange plastic snow fencing around the trunk between grade and 8 feet
above grade to create a padding at least 1 to 2 inches thickness.
Stand 2x4 wood boards upright, side by side, around the entire circumference of the trunk. Affix using duct tape
(do not use wires or ropes). See spec image above right.
4.Chain Link Fencing Type I and/or Type II Protection with Silt Fencing Addition:
Erect five-foot tall chain link fence on seven-foot long, two-inch diameter iron tube posts pounded 24 inches into
the ground (see sample image at right).
Pre-demolition fence: Per the red dashed lines on the tree map mark-up in the CTA’s arborist report
(routes may be subject to change, depending on the finalized alignments of work items).
This fencing must be erected prior to any heavy machinery traffic or construction material arrival on site.
The protective fencing must not be temporarily moved during construction . No materials, tools,
excavated soil, liquids, substances, etc. are to be placed or dumped, even temporarily, inside
the root protection zone or “RPZ”.
No storage, staging, work, or other activities will be allowed inside the RPZ except with
PA monitoring.
Optional for fencing material: Use chain link fencing panels set on moveable concrete block
footings. Wire the fence panels to iron layout stakes pounded into the ground at the ends of
each fence panel to keep the fence route stabilized and in its correct position. Do not wire the
fence panels to the trunks of the trees.
5.Signage: The RPZ fencing shall have one sign affixed with UV-stabilized zip ties to the chain
link at eye level for every 20-linear feet of fencing, minimum 8”X11” size each, plastic
laminated, with wordage that includes the Town Code section that refers to tree fence
protection requirements (wordage can be adjusted):
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TREE PROTECTION ZONE FENCE
ZONA DE PROTECCION PARA ARBOLES
-NO ENTRE SIN PERMISO-
-LLAME EL ARBOLISTA-
REMOVAL OF THIS FENCE IS
SUBJECT TO PENALTY ACCORDING TO
LOS GATOS TOWN CODE 29.10.1025
PROJECT ARBORIST:
TELEFONO CELL: EMAIL:
6. Irrigation Temporary During Construction:
Apply temporary irrigation to certain specified trees being retained, at a frequency and duration
or total output to be specified by the project arborist (PA).
Method of water delivery can be soaker hose, emitter line, garden hose trickle, water truck, tow-
behind water tank with spray apparatus, etc.
Initial suggestion by the CTA is 1x/week heavy irrigation of all trees being retained, at a rate
of 50 gallons per week per each tree (or “to be determined”), applied throughout the
entire fenced-off root protection zone areas.
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7.Demolition of Existing Walkways and Parking Lot Surfaces / Special Notes:
a.If woody tree roots measuring 1 inch diameter or larger are found to be coursing through
the older base rock beneath the existing older concrete sidewalks to be demolished at this
site, then work with the project arborist (PA) to determine a solution which allows for
demolition to occur while also minimizing olive tree root loss and root damage (i.e. near
protected-size olive trees #6, 7, 12, etc.).
If possible, all base rock base course beneath the demolished surfacing should be allowed
to remain in-situ, to avoid damaging or destroying existing woody lateral roots.
Immediately move the chain link RPZ fence panels or chain link mesh fence runs over the
demolition areas after surface materials are demolished, to protect base rock areas that
may contain woody roots.
Irrigate immediately (same day) to thoroughly saturate the uppermost 24 inches of the soil
profile, to prevent root desiccation.
8.Root Pruning:
All root pruning shall be performed only by, or under direct supervision of an ISA-Certified
Arborist
If woody roots measuring greater than 1-inch in diameter are encountered within 10-feet of
any tree being retained during site work (30 to 40 feet from cedar #19), contractors shall
alert the project arborist, and shall proceed to sever roots at right angles to the direction of root
growth using sharp hand tools such as professional grade loppers, hand shears, chain saw,
A/C sawzall, or other tools only under his/her direct supervision. See spec images at right.
Note that a Sawzall blade indicating use for “bimetal” or “demolition” is typically not a good
choice for this work. Instead, opt for a relatively large-toothed blade that indicates use for
“pruning” or “wood” (see images at right).
Sever each root at a right angle to the root growth direction.
Woody roots shall not be shattered or broken in any way as a result of site activities. Shattered or broken areas shall be hand dug back into clear
healthy root tissue and re-severed at right angles to root growth direction under the direct supervision of the project arborist (PA). Immediately (same
day) backfill over roots and heavily irrigate (same day) after backfill to saturate the uppermost 24 inches of the soil profile.
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9. Walkway Sample Spec / “Minimal Dig”:
At right is a sample image of a minimal-dig type tree root-friendly
walkway which uses only a 4 inch depth of cut for both the
baserock base section and the header board burial. A similar spec
could be utilized for the proposed new walkways near trees #9 and
#12 at this site.
10. Water Spray:
Spray off foliage of all trees within 30 feet of construction activity
using a very high power garden hose or a pressure washer system
set on low pressure to wash both the upper and lower surfaces of
foliage. This helps keep the gas portals (stomata) unclogged for
better gas exchange which is crucial for normal tree function (see
image at right in which a fire hose system was used to wash
approximately 50 redwood tree specimens in Sunnyvale during a one-year demolition period).
Spray should be applied approximately twice yearly, or when ambient airborne dust concentration is
unusually high.
6.0 Tree Protection and Maintenance Directions per Town Code
The following is excerpted directly from the 2015 iteration of the Town of Los Gatos tree ordinance sections which
provide specific tree protection directions and limitations on root pruning and above-ground pruning:
Sec. 29.10.1000. New property development.
(a) A tree survey shall be conducted prior to submittal of any developm ent application proposing the removal
of or impact to one or more protected trees. The developm ent application shall include a Tree Survey Plan and
Tree Preservation Report based on this survey. The tree survey inventory num bers shall correspond to a numbered
metal tag placed on each tree on site during the tree survey. The tree survey plan shall be prepared by a certified or
consulting arborist, and shall include the following information: (1) Location of all existing trees on the property as described in section 29.10.0995; (2) Identify all trees that could potentially be affected by the project (directly or indirectly- immediately or
in long term), such as upslope grading or compaction outside of the dripline; (3) Notation of all trees classified as protected trees; (4) In addition, for trees four (4) inches in diam eter or larger, the plan shall specify the precise location of the trunk and crown spread, and the
species, size (diam eter, height, crown spread) and condition of the tree.
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(b) The tree survey plan shall be reviewed by the Town’s consulting arborist who shall, after making a field visit to the property, indicate in writing or as
shown on approved plans, which trees are recommended for preservation (based on a retention rating of high/moderate/low) using, as a m inimum, the
Standards of Review set forth in section 29.10.0990. This plan shall be m ade part of the staff report to the Town reviewing body upon its consideration of the
application for new property developm ent; (c) When development im pacts are within the dripline of or will affect any protected tree, the applicant shall provide a tree preservation report prepared
by a certified or consulting arborist. The report, based on the findings of the tree survey plan and other relevant information, shall be used to determine the
health and structure of existing trees, the effects of the proposed developm ent and vegetation removal upon the trees, recommendations for specific
precautions necessary for their preservation during all phases of development (demolition, grading, during construction, landscapin g); and shall also
indicate which trees are proposed for removal. The tree preservation report shall stipulate a required tree protection zone (TPZ) for trees to be
retained, including street trees, protected trees and trees whose canopies are hanging over the project site from adjacent properties. The TPZ shall be
fenced as specified in section 29.10.1005: (1) The final approved tree preservation report shall be included in the building permit set of developm ent plans and printed on a sheet titled:
Tree Preservation Instructions (Sheet T-1). Sheet T-1 shall be referenced on all relevant sheets (civil, demolition, utility, landscape,
irrigation) where tree im pacts from improvements may be shown to occur; (2) The Town reviewing body through its site and design plan review shall endeavor to protect all trees recomm ended for preservation by the
Town’s consulting arborist. The Town reviewing body may determine if any of the trees recommended for preservation should be removed, if
based upon the evidence subm itted the reviewing body determines that due to special site grading or other unusual characteristics
associated with the property, the preservation of the tree(s) would significantly preclude feasible developm ent of the property as described in
section 29.10.0990; (3) Approval of final site or landscape plans by the appropriate Town reviewing body shall comply with the following requirem ents and conditions of
approval: a. The applicant shall, within ninety (90) days of final approval or prior to issuance of a grading or building permit, whichever occurs
first, secure an appraisal of the condition and value of all trees included in the tree report affected by the developm ent that are required to
remain within the development using the Tree Value Standard methodology as set forth in this Chapter. The appraisal of each tree shall
recognize the location of the tree in the proposed development. The appraisal shall be performed in accordance with the current edition of
the Guide for Plant Appraisal published by the Council of Tree and Landscape Appraisers (CTLA) and the Species and Group Classification
Guide published by the W estern Chapter of the International Society of Arboriculture. The appraisal shall be performed at the applicant's
expense, and the appraisal shall be subject to the Director's approval.
b. The site or landscape plans shall indicate which trees are to be removed. However, the plans do not constitute approval to remove a
tree until a separate permit is granted. The property owner or applicant shall obtain a protected tree rem oval permit, as outlined in section
29.10.0980, for each tree to be removed to satisfy the purpose of this division. (d) Prior to acceptance of proposed developm ent or subdivision im provem ents, the developer shall submit to the Director a final tree preservation
report prepared by a certified or consulting arborist. This report shall consider all trees that were to remain within the developm ent. The report shall note
the trees' health in relation to the initially reported condition of the trees and shall note any changes in the trees' num bers or physical conditions. The
applicant will then be responsible for the loss of any tree not previously approved for removal. For protected trees, which were removed, the
developer shall pay a penalty in the am ount of the appraised value of such tree in addition to replacem ent requirem ents contained in section
29.10.0985 of this Code. The applicant shall remain responsible for the health and survival of all trees within the development for a period of five (5) years
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following acceptance of the public im provem ents of the development or certificate of occupancy.
(e) Prior to issuance of any demolition, grading or building perm it, the applicant or contractor shall submit to the Building Department a written
statem ent and photographs verifying that the required tree protection fence is installed around street trees and protected trees in accordance with the tree
preservation report.
(f) If required by the Director and conditioned as part of a discretionary approval, a security guarantee shall be provided to the Town. Prior to the
issuance of any permit allowing construction to begin, the applicant shall post cash, bond or other security satisfactory to the Director, in the penal
sum of five thousand dollars ($5,000.00) for each tree required to be preserved, or twenty-five thousand dollars ($25,000.00), whichever is less. The
cash, bond or other security shall be retained for a period of one (1) year following acceptance of the public im provements for the developm ent and shall
be forfeited in an am ount equal to five thousand dollars ($5,000.00) per tree as a civil penalty in the event that a tree or trees required to be preserved
are removed, destroyed or severely dam aged.
(g) An applicant with a proposed developm ent which requires underground utilities shall avoid the installation of said utilities within the dripline of
existing trees whenever possible. In the event that this is unavoidable, all trenching shall be done using directional boring, air-spade excavation or b y hand,
taking extreme caution to avoid damage to the root structure. Work within the dripline of existing trees shall be supervised at all times by a certified or
consulting arborist.
(h) It shall be a violation of this division for any property owner or agent of the owner to fail to comply with any developm ent approval condition
concerning preservation, protection, and maintenance of any protected tree.
(Ord. No. 2114, §§ I, II, 8-4-03)
Sec. 29.10.1005. Protection of trees during construction.
(a) Protective tree fencing shall specify the following:
(1) Size and materials. Six (6) foot high chain link fencing, m ounted on two-inch diam eter galvanized iron posts, shall be driven into the ground
to a depth of at least two (2) feet at no m ore than 10-foot spacing. For paving area that will not be demolished and when stipulated in a tree
preservation plan, posts may be supported by a concrete base.
(2) Area type to be fenced. Type I: Enclosure with chain link fencing of either the entire dripline area or at the tree protection zone (TPZ), when
specified by a certified or consulting arborist. Type II: Enclosure for street trees located in a planter strip: chain link fence around the entire
planter strip to the outer branches. Type III: Protection for a tree located in a sm all planter cutout only (such as downtown): orange plastic
fencing shall be wrapped around the trunk from the ground to the first branch with 2-inch wooden boards bound securely on the outside.
Caution shall be used to avoid dam aging any bark or branches.
(3) Duration of Type I, II, III fencing. Fencing shall be erected before demolition, grading or construction permits are issued and remain in
place until the work is completed. Contractor shall first obtain the approval of the project arborist on record prior to removing a tree protection
fence.
(4) Warning sign. Each tree fence shall have prominently displayed an 8.5 x 11-inch sign stating: "Warning—Tree Protection Zone-this fence shall
not be removed and is subject to penalty according to Town Code 29.10.1025".
(b) All persons, shall comply with the following precautions:
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(1) Prior to the comm encement of construction, install the fence at the dripline, or tree protection zone (TPZ) when specified in an approved arborist
report, around any tree and/or vegetation to be retained which could be affected by the construction and prohibit any storage of construction
materials or other m aterials, equipm ent cleaning, or parking of vehicles within the TPZ. The dripline shall not be altered in any way so as to
increase the encroachment of the construction.
(2) Prohibit all construction activities within the TPZ, including but not limited to: excavation, grading, drainage and leveling within the dripline of
the tree unless approved by the Director.
(3) Prohibit disposal or depositing of oil, gasoline, chemicals or other harmful m aterials within the dripline of or in drainage channels, swales or
areas that may lead to the dripline of a protected tree.
(4) Prohibit the attachment of wires, signs or ropes to any protected tree.
(5) Design utility services and irrigation lines to be located outside of the dripline when feasible.
(6) Retain the services of a certified or consulting arborist who shall serve as the project arborist for periodic m onitoring of the project site and the
health of those trees to be preserved. The project arborist shall be present whenever activities occur which may pose a potential threat to the
health of the trees to be preserved and shall document all site visits.
(7) The Director and project arborist shall be notified of any dam age that occurs to a protected tree during construction so that proper treatm ent may
be administered.
(Ord. No. 2114, §§ I, II, 8-4-03)
Sec. 29.10.1010. Pruning and maintenance.
All pruning shall be in accordance with the current version of the International Society of Arboriculture Best Managem ent Practices—Tree Pruning
and ANSI A300-Part 1 Tree, Shrub and Other Woody Plant Managem ent—Standard Practices, (Pruning) and any special conditions as determined by the
Director. For developm ents, which require a tree preservation report, a certified or consulting arborist shall be in reasonable charge of all activities involving
protected trees, including pruning, cabling and any other work if specified.
(1) Any public utility installing or maintaining any overhead wires or underground pipes or conduits in the vicinity of a protected tree shall obtain
permission from the Director before performing any work, including pruning, which may cause injury to a protected tree. (e.g. cable TV/fiber optic
trenching, gas, water, sewer trench, etc.).
(2) Pruning for clearance of utility lines and energized conductors shall be performed in compliance with the current version of the Am erican
National Standards Institute (ANSI) A300 (Part 1)- Pruning, Section 5.9 Utility Pruning. Using spikes or gaffs when pruning, except where no
other alternative is available, is prohibited.
(3) No person shall prune, trim, cut off, or perform any work, on a single occasion or cumulatively, over a three-year period, affecting twenty-five
percent or m ore of the crown of any protected tree without first obtaining a permit pursuant to this division except for pollarding of fruitless
mulberry trees (Morus alba) or other species approved by the Town Arborist. Applications for a pruning permit shall include photographs indicating
where pruning is proposed.
(4) No person shall remove any Heritage tree or large protected tree branch or root through pruning or other method greater than four (4) inches in
diameter (12.5” in circumference) without first obtaining a permit pursuant to this division.
(Ord. No. 2114, §§ I, II, 8-4-03)
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7.0 Tree Replacement Standards – Los Gatos Town Code
(Excerpted from Town Code 29.10.0985 and 29.10.0987)
(1) Two (2) or more replacement trees, of a species and size designated by the Director, shall be planted on the subject private property. Table 3-1
The Tree Canopy—Replacem ent Standard shall be used as a basis for this requirem ent. The person requesting the permit shall pay the cost
of purchasing and planting the replacem ent trees.
(2) If a tree or trees cannot be reasonably planted on the subject property, an in-lieu payment in an am ount set forth by the Town Council by
resolution shall be paid to the Town Tree Replacem ent Fund to: a. Add or replace trees on public property in the vicinity of the subject property; or b. Add or replace trees or landscaping on other Town property; or c. Support the T own’s urban forestry management program. (Ord. No. 2114, §§ I, II, 8-4-03)
Table 3-1 - Tree Canopy - Replacement Standard
Canopy Size of Removed Tree 1
(Staff is using 24” box size as
the Replacement Standard for
SFR Projects as of 2016) 2,4
Single Family
Residential
Replacement3,4
10 feet or less Two 24 inch box trees Two 15 gallon trees
More than 10 feet to 25 feet Three 24 inch box trees Three 15 gallon trees
More than 25 feet to 40 feet
Four 24 inch box
trees; or Two 36
inch box trees
Four 15 gallon trees
More than 40 feet to 55 feet
Six 24 inch box
trees; or Three
36 inch box
trees
Not Available
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Greater than 55 feet
Ten 24 inch box
trees; or Five 36
inch box trees
Not Available
Notes
1To measure an asymm etrical canopy of a tree, the widest m easurement shall be used to determ ine canopy size.
2Often, it is not possible to replace a single large, older tree with an equivalent tree(s). In this case, the tree may be replaced with a combination of
both the Tree Canopy Replacement Standard and in-lieu paym ent in an amount set forth by Town Council resolution paid to the Town Tree
Replacement Fund.
3Single Family Residential Replacement Option is available for developed single family residential lots under 10,000 square feet that are not
subject to the Town’s Hillside Development Standards and Guidelines. All 15-gallon trees must be planted on-site. Any in-lieu fees for single
family residential shall be based on 24” box tree rates as adopted by Town Council.
4Replacem ent Trees shall be approved by the Town Arborist and shall be of a species suited to the available planting location, proximity to structures,
overhead clearances, soil type, com patibility with surrounding canopy and other relevant factors. Replacem ent with native species shall be strongly
encouraged. Replacem ent requirements in the Hillsides shall comply with the Hillside Developm ent Standards and Guidelines Appendix A and
Section 29.10.0987 Special Provisions--Hillsides.
Sec. 29.10.0987. Special Provisions—Hillsides
The Town of Los Gatos recognizes its hillsides as an im portant natural resource and sensitive habitat which is also a key component of the
Town’s identity, character and charm . In order to maintain and encourage restoration of the hillside environm ent to its natural state, the Town
has established the following special provisions for tree removal and replacem ent in the hillsides:
(1) All protected trees located 30 or m ore feet from the prim ary residence that are removed shall be replaced with native trees listed in Appendix A
Recommended Native Trees for Hillside Areas of the Town of Los Gatos Hillside Development Standards and Guidelines (HDS&G).
(2) All protected trees located within 30 feet of the primary residence that are removed shall be replaced as follows:
(a) If the removed tree is a native tree listed in Appendix A of the HDS&G, it shall only be replaced with a native tree listed in Appendix A of
the HDS&G.
(b) If the removed tree is not listed in Appendix A, it may be replaced with a tree listed in Appendix A, or replaced with another species of
tree as approved by the Director.
(c) Replacem ent trees listed in Appendix A may be planted anywhere on the property.
(d) Replacem ent trees not listed in Appendix A may only be planted within 30 feet of the primary residence.
(3) Replacement requirements shall comply with the requirements in Table 3-1 Tree Canopy Replacement Standard of this Code.
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(4) Property owners should be encouraged to retain dead or declining trees where they do not pose a safety or fire hazard, in order to foster wildlife
habitat and the natural renewal of the hillside environment.
8.0 Author’s Qualifications
• Continued education through The American Society of Consulting Arborists, The International Society of Arboriculture (Western Chapter), and
various governmental and non-governmental entities.
• Contract Town Arborist, Town of Los Gatos, California
Community Development Department / Planning Division
2015-present
• Tree Risk Assessment Qualified (ISA TRAQ Course Graduate, Palo Alto, California)
• Millbrae Community Preservation Commission (Tree Board)
2001-2006
• ASCA Registered Consulting Arborist #401
• ASCA Arboriculture Consulting Academy graduate, class of 2000
• Associate Consulting Arborist
Barrie D. Coate and Associates
4/99-8/99
• Contract City Arborist, City of Belmont, California
Planning and Community Development Department
5/99-present
• ISA Certified Arborist #WC-3172
• Peace Corps Soil and Water Conservation Extension Agent
Chiangmai Province, Thailand 1991-1993
• B.A. Environmental Studies/Soil and Water Resources
UC Santa Cruz, Santa Cruz, California 1990
(My full curriculum vitae is available upon request)
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9.0 Assumptions and Limiting Conditions
Any legal description provided to the consultant/appraiser is assumed to be correct. Any titles and ownership to any property are assumed to be good and marketable. No responsibility is assumed
for matters legal in character. Any and all property is appraised and evaluated as through free and clean, under responsible ownership and competent management.
It is assumed that any property is not in violation of any applicable codes, ordinance, statutes, or other government regulations.
Care has been taken to obtain all information from reliable sources. All data has been verified insofar as possible; however, the consultant/appraiser can neither guarantee nor be responsible for
the accuracy of information provided by others.
The consultant/appraiser shall not be required to give testimony or to attend court by reason of this report unless subsequent contractual arrangements are made, including payment of an
additional fee for such services as described in the fee schedule and contract of engagement.
Unless required by law otherwise, the possession of this report or a copy thereof does not imply right of publication or use for any other purpose by any other than the person to whom it is
addressed, without the prior expressed written or verbal consent of the consultant/appraiser.
Unless required by law otherwise, neither all nor any part of the contents of this report, nor copy thereof, shall be conveyed by anyone, including the client, to the public through advertising, public
relations, news, sales, or other media, without the prior expressed conclusions, identity of the consultant/appraiser, or any reference to any professional society or institute or to any initiated
designation conferred upon the consultant/appraiser as stated in his qualifications.
This report and any values expressed herein represent the opinion of the consultant/appraiser, and the consultant’s/appraiser’s fee is in no way contingent upon the reporting of a specified value, a
stipulated result, the occurrence of a subsequent event, nor upon any finding to be reported.
Sketches, drawings, and photographs in this report, being intended for visual aids, are not necessarily to scale and should not be construed as engineering or architectural reports or surveys
unless expressed otherwise. The reproduction of any information generated by engineers, architects, or other consultants on any sketches, drawings, or photographs is for the express purpose of
coordination and ease of reference only. Inclusion of said information on any drawings or other documents does not constitute a representation by Walter Levison to the sufficiency or accuracy of
said information.
Unless expressed otherwise:
a. information contained in this report covers only those items that were examined and reflects the conditions of those items at the time of inspection; and
b. the inspection is limited to visual examination of accessible items without dissection, excavation, probing, or coring. There is no warranty or guarantee, expressed or implied, that
problems or deficiencies of the plants or property in question may not arise in the future.
Loss or alteration of any part of this report invalidates the entire report.
Arborist Disclosure Statement:
Arborists are tree specialists who use their education, knowledge, training, and experience to examine trees, recommend measures to enhance the beauty and health of trees, and attempt to
reduce the risk of living near trees. Clients may choose to accept or disregard the recommendations of the arborist, or to seek additional advice.
Arborists cannot detect every condition that could possibly lead to the structural failure of a tree. Tree are living organisms that fail in ways we do not fully understand. Conditions are often hidden
within trees and below ground. Arborist cannot guarantee that a tree will be healthy or safe under all circumstances, or for a specified period of time. Likewise, remedial treatments, like any
medicine, cannot be guaranteed.
Treatment, pruning, and removal of trees may involve considerations beyond the scope of the arborist’s services such as property boundaries, property ownership, site lines, disputes between
neighbors, and other issues. Arborists cannot take such considerations into account unless complete and accurate information is disclosed to the arborist. An arborist should then be expected to
reasonably rely upon the completeness and accuracy of the information provided.
Trees can be managed, but they cannot be controlled. To live near trees is to accept some degree of risk. The only way to eliminate all risk associated with trees is to eliminate the trees.
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Walter Levison 2017 All Rights Reserved
10.0 Certification
I hereby certify that all the statements of fact in this report are true, complete, and correct to the best of my knowledge and belief, and are made in good faith.
Signature of Consultant
11.0 Digital Images
WLCA archived images of survey trees on 2/10/2017. The following is a set of images that covers all of the survey tree specimens discussed in this CTA
report.
Tree # Image Tree # Image
Looking
West at
#1, 2, 3, 4
Looking
North at
#5, 6
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
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Tree # Image Tree # Image
7
Looking
East at
#8, 9, 10,
11, 12, 13
Looking
East at
#14, 15,
16, 17
North view
of #18.
Note that
this
sidewalk
area is not
currently
proposed
by the
applicant
to be
renovated.
However,
the apron
in the
foreground
is.
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Tree # Image Tree # Image
19
19 Close-
up of
asphalt
cracking,
assumably
due to root
expansion
from this
tree which
radiates
Northward
into the
proposed
scarify
cation area
of the
existing
parking lot.
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
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12.0 Tree Data Table
Tree Tag Number Genus &
Species
Common
Name Trunk1 Diameter Trunk2 Diameter Trunk3 Diameter Sum of All Trunk Diameters Height & Canopy Spread (Ft.) Health & Structural Rating (100% Each) Overall
Condition
Rating
(0 to
100%) (R)emove Tree (S)ave Tree (D)isposition Unclear Severity of Impacts Expected from Site Plan Related Work Lopsided Canopy (note direction) Trunk Lean (note direction ) Girdling Roots Buried Root Crown Pests and Disease Presence, and Other Notes SUGGESTED ROOT PROTECTION FENCE RADIUS (Ft.) MAINTENANCE AND PROTECTION CODES 1
Olea
europaea
(Less than
18 total
inches
diameter.
Tree may be
considered
“non-
protected
fruit tree”),
European
olive 13.7 13.7 18/
22 55/45 50% Fair X (To be removed)
Previously topped.
Decay noted at 6 to
15 feet.
n/a To be removed
2 Olea
europaea
European
olive 8 7 6 21 18/
21 55/45 50% Fair X (To be removed)
Extensive decay
noted. Previously
topped.
n/a To be removed
3
Olea
europaea
(Less than
18 total
inches
diameter.
Tree may be
considered
“non-
protected
fruit tree”),
European
olive 12.1 12.1 20/
17 60/50 55% Fair X (To be removed)
Previously
topped. Decay
noted at 5 feet.
n/a To be removed
4
Olea
europaea
(Less than
18 total
inches
diameter.
Tree may be
considered
“non-
protected
fruit tree”),
European
olive 16.5 16.5 22/
20 70/40 50% Fair X (To be removed) Previously
topped. n/a To be removed
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
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Tree Tag Number Genus &
Species
Common
Name Trunk1 Diameter Trunk2 Diameter Trunk3 Diameter Sum of All Trunk Diameters Height & Canopy Spread (Ft.) Health & Structural Rating (100% Each) Overall
Condition
Rating
(0 to
100%) (R)emove Tree (S)ave Tree (D)isposition Unclear Severity of Impacts Expected from Site Plan Related Work Lopsided Canopy (note direction) Trunk Lean (note direction ) Girdling Roots Buried Root Crown Pests and Disease Presence, and Other Notes SUGGESTED ROOT PROTECTION FENCE RADIUS (Ft.) MAINTENANCE AND PROTECTION CODES 5 Olea
europaea
European
olive 12 9 8 29 25/
22 70/50 60% Fair X
Proposed new
restroom area will
encroach to within 8
to 10 feet of the
trunk edge, limiting
root zone fencing
offset from trunk to
4 feet east radius at
most, which is less
than standard.
Previously topped.
5 to 15
feet offset
from
trunk, in
an
elongated
rectangul
ar shape
per tree
map in
this
report.
RPZ, TB,
IRRIGATION
WEEKLY
Keep all new
irrigation pipe
trenching to a
max. of 6
inches depth of
cover to
minimize tree
root loss
during
installation.
6 Olea
europaea
European
olive 10 10 8 35 28/
21 65/50 59% Fair X
Proposed new
restroom area will
encroach to within 8
to 10 feet of the
trunk edge, limiting
root zone fencing
offset from trunk to
4 feet east radius at
most, which is less
than standard.
Previously topped.
Four total
mainstems.
5 to 15
feet offset
from
trunk, in
an
elongated
rectangul
ar shape
per tree
map in
this
report.
RPZ, TB,
IRRIGATION
WEEKLY
Keep all new
irrigation pipe
trenching to a
max. of 6
inches depth of
cover to
minimize tree
root loss
during
installation
7 Olea
europaea
European
olive 9 8 7 24 20/
18 40/40 40% Poor X
The only impacts to
this tree will be from
new irrigation pipe
installation during
landscape
renovation.
North
Previously topped.
Extensive decay
noted in lower
trunk regions.
Canopy is lopsided
North.
5 to 10
feet offset
from
trunk per
the map
in this
report.
RPZ, TB,
IRRIGATION
WEEKLY
Keep all new
irrigation pipe
trenching to a
max. of 6
inches depth of
cover to
minimize tree
root loss
during
installation
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture
Walter Levison 2017 All Rights Reserved
Tree Tag Number Genus &
Species
Common
Name Trunk1 Diameter Trunk2 Diameter Trunk3 Diameter Sum of All Trunk Diameters Height & Canopy Spread (Ft.) Health & Structural Rating (100% Each) Overall
Condition
Rating
(0 to
100%) (R)emove Tree (S)ave Tree (D)isposition Unclear Severity of Impacts Expected from Site Plan Related Work Lopsided Canopy (note direction) Trunk Lean (note direction ) Girdling Roots Buried Root Crown Pests and Disease Presence, and Other Notes SUGGESTED ROOT PROTECTION FENCE RADIUS (Ft.) MAINTENANCE AND PROTECTION CODES 8
Olea
europaea
(Less than
18 total
inches
diameter.
Tree may be
considered
“non-
protected
fruit tree”),
European
olive 10.6 6.0 16.6 23/
18 55/40 48% Poor X (Tree to be
removed)
Decay noted at 8
feet.
Tree previously
topped.
n/a To be removed
9 Olea
europaea
European
olive 7 5 5 17 20/
20 60/40 50% Fair X
Impacts to the root
zone will be from
new irrigation pipe
trenching, and from
the new north-south
oriented walkway to
the west of the trunk
of this tree.
Decay noted in
lower trunk.
Previously topped.
5 to 10
feet offset
from
trunk per
the map
in this
report.
RPZ, TB,
IRRIGATION
WEEKLY
Keep all new
irrigation pipe
trenching to a
max. of 6
inches depth of
cover to
minimize tree
root loss
during
installation
10
Olea
europaea
(at less than
18 inches
diameter,
this is not a
protected
size fruit
tree per
strict
definition)
European
olive 9.0 7.3 16.3 20/
18 40/30 30% Poor X (To be removed) North North
Extensive decay
through lower
elevation areas.
Previously topped.
Leans North.
Lopsided North.
n/a To be removed
11 Olea
europaea
European
olive 8 6 6 26 24/
21 40/25 30% Poor X (To be removed) North North
Extensive decay
from 0 to 15 feet
elevation.
Previously topped.
Leans North.
Lopsided North.
n/a To be removed
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture
Walter Levison 2017 All Rights Reserved
Tree Tag Number Genus &
Species
Common
Name Trunk1 Diameter Trunk2 Diameter Trunk3 Diameter Sum of All Trunk Diameters Height & Canopy Spread (Ft.) Health & Structural Rating (100% Each) Overall
Condition
Rating
(0 to
100%) (R)emove Tree (S)ave Tree (D)isposition Unclear Severity of Impacts Expected from Site Plan Related Work Lopsided Canopy (note direction) Trunk Lean (note direction ) Girdling Roots Buried Root Crown Pests and Disease Presence, and Other Notes SUGGESTED ROOT PROTECTION FENCE RADIUS (Ft.) MAINTENANCE AND PROTECTION CODES 12 Olea
europaea
European
olive 11.5 8.3 19.8 20/
24 65/50 60% Fair X
Demolition of
concrete will occur
along the South side
of the tree.
Deep excavation for
new footings will
occur South of the
tree.
New walkway
construction will
occur 2 to 4 feet
South of tree
(approx) which will
sever roots at that
location unless
limited to shallow
cut depth.
Irrigation pipe
trenching for new
landscape.
North
Previously topped.
Leans North.
Per CTA’s
tree map
in this
report.
Approx. 5
to 15 feet
offset
radius
RPZ, TB,
IRRIGATION
WEEKLY
Limit irrigation
pipe trench
depth to 6
inches approx.
total cut.
Limit new
walkway
excavation
depth to 4
inches total cut
depth for base
rock
installation.
13
Olea
europaea
Note total
diameter is
slightly less
than 18
inches.
Therefore,
the tree is
technically a
non-
protected
fruit tree.
European
olive 9.0 8.7 17.7 22/
20 60/40 50% Fair X
Proposed new
“pervious surface”
down-driveway to
garage will sever the
tree’s South
quadrant root
system if baserock
excavation is not
limited to 6 inches
of total depth of cut.
Irrigation pipe
trenching will occur
as well.
Demolition of
concrete will occur
along the West side
of the tree.
East
Previously topped.
Leans East.
Two (2) bacterial
galls noted
(assumed to be
Agrobacteria
tumefasciens)
Per CTA’s
tree map
in this
report.
Approx. 5
to 15 feet
offset
radius
RPZ, TB,
IRRIGATION
WEEKLY
Limit irrigation
pipe trench
depth to 6
inches approx.
total cut.
Limit new
driveway
excavation
depth to 6
inches total cut
depth for base
rock
installation.
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32 of 34
Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
Registered Member, American Society of Consulting Arborists and Member of the International Society of Arboriculture
Walter Levison 2017 All Rights Reserved
Tree Tag Number Genus &
Species
Common
Name Trunk1 Diameter Trunk2 Diameter Trunk3 Diameter Sum of All Trunk Diameters Height & Canopy Spread (Ft.) Health & Structural Rating (100% Each) Overall
Condition
Rating
(0 to
100%) (R)emove Tree (S)ave Tree (D)isposition Unclear Severity of Impacts Expected from Site Plan Related Work Lopsided Canopy (note direction) Trunk Lean (note direction ) Girdling Roots Buried Root Crown Pests and Disease Presence, and Other Notes SUGGESTED ROOT PROTECTION FENCE RADIUS (Ft.) MAINTENANCE AND PROTECTION CODES 14 Liquidambar
styraciflua Sweetgum 16.0 16.0 50/
22 60/60 60% Fair X
New deep sidewalk
cuts will occur to
within
approximately 6 feet
Southeast of the
trunk edge.
Tree needs
permanent
irrigation if
possible, without
causing root loss
from pipe
trenching.
Per the
CTA’s
map in
this
report.
TB, RPZ,
IRRIGATION
Limit new
excavation
cuts to existing
bottom edge of
base rock.
15 Liquidambar
styraciflua Sweetgum 14.5 14.5 30/
25 40/25 28% Very
Poor X
New deep sidewalk
cuts will occur to
within
approximately 2 to 3
feet South of the
trunk edge.
Tree needs
permanent
irrigation if
possible, without
causing root loss
from pipe
trenching.
Apical meristem is
split out, possibly
as a result of soil
moisture deficit.
Tear wound noted
5 to 7 feet above
grade (auto
collision?)
Per the
CTA’s
map in
this
report.
TB, RPZ,
IRRIGATION
Limit new
excavation
cuts to existing
bottom edge of
base rock.
16 Liquidambar
styraciflua Sweetgum 12.7 12.7 50/
21 55/50 50% Fair X
New deep sidewalk
cuts will occur to
within
approximately 7 feet
Southwest of the
trunk edge.
Tree needs
permanent
irrigation if
possible, without
causing root loss
from pipe
trenching.
Note scaffold limb
splitout at 14 feet
elevation over
street.
Per the
CTA’s
map in
this
report.
TB, RPZ,
IRRIGATION
Limit new
excavation
cuts to
elevation of
existing
bottom edge of
base rock.
17 Liquidambar
styraciflua Sweetgum 13.6 13.6 45/
20 60/55 57% Fair X
New deep driveway
apron cuts will
occur to within
approximately 4 feet
East of the trunk
edge.
Tree needs
permanent
irrigation if
possible, without
causing root loss
from pipe
trenching.
Per the
CTA’s
map in
this
report.
TB, RPZ,
IRRIGATION
Limit new
apron
excavation to
elevation of
existing
bottom edge of
base rock.
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
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Walter Levison 2017 All Rights Reserved
Tree Tag Number Genus &
Species
Common
Name Trunk1 Diameter Trunk2 Diameter Trunk3 Diameter Sum of All Trunk Diameters Height & Canopy Spread (Ft.) Health & Structural Rating (100% Each) Overall
Condition
Rating
(0 to
100%) (R)emove Tree (S)ave Tree (D)isposition Unclear Severity of Impacts Expected from Site Plan Related Work Lopsided Canopy (note direction) Trunk Lean (note direction ) Girdling Roots Buried Root Crown Pests and Disease Presence, and Other Notes SUGGESTED ROOT PROTECTION FENCE RADIUS (Ft.) MAINTENANCE AND PROTECTION CODES 18 Liquidambar
styraciflua Sweetgum 19.9 19.9 45/
20 55/55 55% Fair X
New deep driveway
apron cut will
encroach to within
approximately 5.5
feet South of the
trunk edge of this
tree.
New landscaping
irrigation pipe
trenching will sever
the root system of
this tree as well.
Tree needs
permanent
irrigation if
possible, without
causing root loss
from pipe
trenching.
Root system
expansion causing
heave of existing
sidewalk,
estimated to be
greater than 4
inches total
displacement of
the slabs.
However, for some
reason the current
proposed scope of
project does not
include
replacement of
concrete in this
area. Replacement
may cause severe
root loss, and
death or decline of
the tree.
Per the
CTA’s
map in
this
report.
TB, RPZ,
IRRIGATION
Limit new
apron
excavation to
elevation of
existing
bottom edge of
base rock.
Limit new
irrigation pipe
trenching to 6
inch total cut
below grade.
Consider
replacement of
the existing
sidewalk slabs
using rubber
slabs or other
technology
that can be
placed over
older baserock
and allow for
continued
vertical
displacement
over time due
to root
expansion.
19 Cedrus
deodara
Deodar
cedar 16.8 16.8 50/
30 90/84 88% Good X
Proposed A/C
grinding in parking
lot will encroach to
within approx. 15
feet of the trunk
edge. This may
result in severe root
loss of woody roots
are removed
between 15 and 25
or more feet from
trunk. Roots appear
to be present out to
40 to 50 feet radius
from trunk (not
verified).
Note bark inclusion
at zero to 2 feet
elevation. Suggest
remove the
downhill
(northmost)
mainstem. Also
needs load
reduction pruning
by removing
endweights from
ends of limbs.
Per CTA’s
tree map
in this
report.
RPZ, TB,
IRRIGATE.
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Site Address: 400 Carlton Avenue, Los Gatos, CA Version: 2/23/2017
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Tree Maintenance and Protection Codes Used in Data Table:
RPZ: Root protection zone fence, chain link, with 2" diameter iron posts driven 24" into the ground, 6 to 8 feet on center max. spacing. Alternative material:
chain link fence panels set over concrete block-type footings, with the fence panels wired to steel pins pounded 24 inches into the ground at both ends of each
panel.
RB: Root buffer consisting of wood chip mulch lain over existing soil as a 12 inch thick layer, overlain with 1 inch or greater plywood strapped together with
metal plates. This root buffer or soil buffer should be placed over the entire width of the construction corridor between tree trunks and construction.
RP: Root pruning. Prune woody roots measuring greater than or equal to 1 inch diameter by carefully back -digging into the soil around each root using small
hand tools until an area is reached where the root is undamaged. Cleanly cut through the root at right angle to the root growth direction, using professional
grade pruning equipment and/or a Sawzall with wood pruning blade. Backfill around the cut root immediately (same day), and thoroughly irrigate the area to
saturate the uppermost 24 inches of the soil profile.
BDRP: Back-dig root pruning: Hand-dig around the broken root, digging horizontally into the open soil root zone until a clean, unbroken, unshattered section of
the root is visible. Proceed as per ‘root pruning’.
RCX: Root crown excavation. Retain an experienced arborist to perform careful hand-digging using small trowels or other dull digging tools to uncover
currently-buried buttress root flares. Digging shall occur between trunk edge and at least two (2) feet horizontal from trunk edge. The final soil elevation will be
at a level such that the tree’s buttress roots visibly flare out from the vertical trunk.
TB: Trunk buffer consists of 20-40 wraps of orange plastic snow fencing to create a 2 inch thick buffer over the lowest 8 feet of tree trunk (usually takes at least
an entire roll of orange fencing per each tree). Lay 2X4 wood boards vertically, side by side, around the entire circumference of the trunk. Secure buffer using
duct tape (not wires).
F: Fertilization with slow-release Greenbelt 22-14-14 tree formula, as a soil injection application using a fertilizer injection gun. This brand and formulation is
commonly used by reputable tree care companies in the Bay Area. Apply at label rate and injection hole spacing.
M: 4-inch thick layer of chipper truck type natural wood chips (example source: Lyngso Garden Supply, self pick-up). Do not use bark chips or shredded
redwood bark.
W: Irrigate using various methods to be determined through discussion with General Contractor. Irrigation frequency and duration to be determined through
discussion and/or per directions in this report. Native oak species typically require 1x/month irrigation, while other tree species tend to prefer 2x/month or
4x/month moderate to heavy irrigation during construction.
P: Pruning per specifications noted elsewhere. All pruning must be performed only under direct site supervision of an ISA Certified Arborist, or performed
directly by an ISA Certified Arborist, and shall conform to all current ANSI A300 standards.
MON: A Project Arborist must be present to monitor specific work as noted for each tree.