HomeMy WebLinkAboutAttachmt 7 Tree Protection Plan 12-20-2006
ARBOR RESOURCES
Professional Arboricultural Consulting & Tree Care
A TREE PROTECTION PLAN AND REVIEW OF TREES
IN PROXIMITY TO THE TWO BRIDGE CROSSINGS PROPOSED
FOR THE WALLIS RANCH DEVELOPMENT
DUBLIN, CALIFORNIA
APN: 986-0004-005-01
PROJECT APPLICATION NO. 05-051
Submitted to:
Mr. Michael Porto
Consultant Project Manager
City of Dublin
100 Civic Plaza
Dublin, CA 94568
Prepared by:
David L. Babby, RCA
ASCA Registered Consulting Arborist #399
ISA Certified Arborist #WE-4001A
December 20, 2006
P.O. Box 25295, San Mateo, California 94402 . Email: arborresourees@eomcast.net
Phone: 650.654.3351 . Fax: 650.240.0777 . Licensed Contractor #796763
Attachment 7
David L. Babby, Registered Consulting Arborist
December 20. 2006
SECTION
1.0
2.0
3.0
4.0
4.1
4.2
4.3
4.4
4.4a
4.4b
4.4c
4.4d
4.4e
4.4f
4.5
4.6
5.0
5.1
5.2
EXHIBIT
A
TABLE OF CONTENTS
TITLE
PAGE
INTRODUCTION. .................. ............. ........ ........ ........... 1
TREE COUNT AND COMPOSITION ..................................1
SUITABILITY FOR TREE PRESERVATION ....................... 2
PROJECT REVIEW.................... ............ ........ ....... .........2
Trees in Direct Conflict with Bridges ............................... 2
Trees that will be Severely Impacted ................................3
Trees Subject to Moderate Impacts.................................. 3
Discussion of Noteworthy Oaks... .......... ......... ............. ...3
Tree #536 ................. ... ............................ ....... ...3
Tree #516.................... ............................ ..........3
Trees #511 thru 514 .......................................................4
Tree #522.................... .... ..... ....... ......... .............4
Tree #523 .......................................................... 5
Tree #524 .......................................................... 6
Trees #528, 531 and 572 ...............................................6
Tree Landscape Design....... ....... ............. ............ ..........7
TREE PROTECTION GUIDELINES ................................... 7
Design Guidelines..... .......... ......... ...... ......... ...... ..... .....7
Protection Measures Before and During Development........ . . . 9
EXHIBIT
TITLE
PHOTOGRAPHS
David L. Babby, Registered Consulting Arborist
December 20, 2006
1.0 INTRODUCTION
I have been retained by the City of Dublin to [I] review the potential tree impacts
associated with constructing two bridges I across Tassajara Creek for the future Wallis
Ranch Development, [2] review the proposed "Project Tree Plan," and [3] present a "tree
protection plan" for the Wallis Ranch Development. This report presents my analysis and
recommendations.
Documents reviewed for this report include the following: [I] an "Arborist Tree
Assessment Report" prepared by Ralph Osterling Consultants, Inc., dated 8/24/06; [2]
memorandum by H. T. Harvey & Associates, dated 9/25/06; [3] two plans of Sheet S-I, one
for the North Bridge and the other for the South Bridge, prepared by Finn Design Group,
Inc., dated 8/24/06; and [4] Sheet L2 (Project Tree Plan) by M.D. Fotheringham, stamp
dated 8/30/06 by the City of Dublin.
2.0 TREE COUNT AND COMPOSITION
There are 60 trees of six various species presented within the "Arborist Tree Assessment
Report" as being in close proximity to the proposed bridges. Their names, numbers and
percentages are summarized in the following table:
PERCENT
NAME TREE NUMBER(S) COUNT OF TOTAL
Box Elder 503 1 2%
California Bay Tree 504 1 2%
Cottonwood 515 1 2%
Elderberry 503A, 551B, 551C 3 5%
505,506,511-514,516-519,
Valley Oak 522-525,527,528,536,541- 38 65%
549,551,565-569,571-576
Willow 502,507-509,529,530-535, 16 25%
537,539,540, 550, 551A
Total
60
100%
1 The bridges are proposed along the project's southern section, the northernmost bcing titled the "North
Bridge" and the southernmost the "South Bridge."
Wallis Ranch, Tassajara Road, Dublin
City of Dublin Planning Division
Page 1 of 12
David L Babby, Registered Consulting Arborist
December 20, 2006
3.0 SUITABILITY FOR TREE PRESERVATION
Based on my visual observations and information presented within the "Arborist Tree
Assessment Report," I have assigned a "high," "moderate" or "low" suitability for
preservation rating to each tree as a method for cumulatively measuring and considering
their physiological health, structural integrity, location, size and species. A description of
these ratings with the assigned tree numbers are presented below and please note they are
not intended to provision which trees are to be removed or remain. Also, note that the
"high" category comprises 27 trees (or 45-percent), the "moderate" category 7 trees (or
12-percent), and the "low" category 26 trees (or 43-percent).
Hil!h: Applies to trees #505-507, 511-514, 517-519, 523, 527, 536, 541-545, 547-549,
567, 568, 571, 573, 575 and 576. They have a high potential of providing long-term
contribution to the site, appear in good health, and contain seemingly stable structures.
These trees can be considered the most suitable for retention and protection.
Moderate: Applies to trees #516, 528, 546, 565, 566, 569 and 574. They contribute to
the site but not at seemingly significant levels. These trees are typically worthy of
protection, however, not at the expense of major design revisions. Typically, their
longevity and contribution is less than those of high suitability and more frequent care
is needed during their remaining life span.
Low: Applies to trees #502, 503, 503A, 504, 508, 509, 515, 522, 524, 525, 529-535,
537, 539, 540, 550, 551, 551A-C and 572 (dead). These trees are predisposed to a
very short life-span and/or predisposed to irreparable health problems and/or structural
defects that are expected to worsen regardless of measures employed. In many
instances, they present a significant risk to the site, and/or are in poor, dying, fallen or
dead condition.
4.0 PROJECT REVIEW
4.1 Trees in Direct Conflict with Bridges
Eleven of the inventoried trees (or 18-percent) are in direct conflict with the future bridges
and will require removal. They include #503A, 530-537, 551B and 551C. Of these, each
but #536 is assigned a low suitability for preservation. Tree #536 is a healthy valley oak
and discussion regarding its conflict is presented in Section 4.3a.
Wallis Ranch, Tassajara Road. Dublin
City of Dublin Planning Division
Page 2 of J 2
David L. Babby, Registered Consulting Arborist
December 20, 2006
4.2 Trees that will be Severely Impacted
An additional six trees (or 8-percent) would be severely impacted and become subjected to
premature decline and instability. They include #503, 516, 522, 529, 539 and 540 and
each is anticipated to be removed. Of these, each but #516 is assigned a low suitability for
preservation. Tree #516 is assigned a moderate suitability and discussion regarding its
condition and anticipated impacts are presented below in Section 4.3b.
4.3 Trees Subject to a Moderate Impacts
There are an additional eight trees (or 13-percent) that would sustain a relatively moderate
level of impacts. They include #502, 504, 528, 541-544 and 573. I am advised that the
project's "Riparian Mitigation Plan" considers the removal of these trees, though I
anticipate each will be retained as they are situated a sufficient distance from the proposed
development activities. In the event trees #528, 541-544 and/or 573 are determined to
require removal, I recommend a written request signed by the applicant/owner is submitted
to the City for review and possible approval. As for trees #502, 504 and 529, I find their
removal should be approved (without the need for review) due to their very poor condition.
4.4 Discussion of Noteworthy Oaks
There are numerous large oak trees that will be affected by the proposed project at varying
degrees, some of which are mentioned above. The specific trees and corresponding
information are discussed within this section. Please note that the photographs referred to
in this section can be viewed in Exhibit A and were obtained on 10/25/06.
4.4a Tree #536 (see photo 1, page A-I). This 22-inch diameter valley oak appears in
excellent condition. It is situated within the middle of the southern bridge crossing,
closest to the eastern approach of the southern bridge crossing, and, consequently,
requires removal. In my opinion, this oak is the only valuable one that requires
removal for the bridge crossings and its loss will not be significant when considering
the vast amount of oaks and other trees throughout the site that will remain.
4.4b Tree #516 (see photo 2, page A-2) This very large, 38-inch diameter valley oak
appears in overall fair condition. Its trunk is situated at the top edge of an estimated
IS-foot tall, vertical creek bank. Due to soil erosion, a relatively substantial amount of
exposed roots protrude beyond the bank. The creek bank immediately northeast of the
trunk ascends an additional 10 feet high and has eroded inward from the trunk.
Wallis Ranch, Tassajara Road, Dublin
City of Dublin Planning Division
Page 3 of 12
David L Babby, Registered Consulting Arborist
December 20, 2006
My review of the proposed plans and survey stakes indicate the bridge will be
constructed about three to four feet from the trunk and will require the removal of two
southwest growing limbs with approximate diameters of 22 and 14 inches. These are
sizeable limbs and account for approximately 35-percent of the canopy. I find this
impact will not likely jeopardize the tree.
I have been advised, however, that this tree will be removed for precautionary reasons,
namely that it present a risk of causing damage to the bridge, such as if it were to
uproot and wash downstream or if a major limb or limbs failed on top of the bridge.
When considering the high vertical creek banks and extent of erosion that has occurred
around and near its root zone, I find that the tree is currently at risk of uprooting in the
foreseeable future, a risk that will increase overtime as erosion continues. Because the
tree's failure can jeopardize the safety and structure of the bridge, I find its removal
would comply with the City's Ordinance.
4.4c Trees #511 thru 514. These four trees surround the perimeter of the existing
bench that will be used as a temporary access road during construction of the north
bridge. Their respective trunk diameters are 31, 47, 28 and 39 inches, and each appears
in overall good condition. Of them, #512 thru 514 will be affected during the operation
of heavy equipment beneath their canopies and mitigation measures are specified
within Section 5.0 of this report to minimize damage.
4.4d Tree #522 (see photos 3, 4 and 5; pages A-3 and A-4). This 43-inch diameter
valley oak is situated on relatively flat terrain at about 14 feet south of the roadway
leading to the north bridge. My observations reveal it to be in such poor and unsafe
condition that it is beyond repair and should be immediately removed regardless of the
proposed project (and the current residents and users of the property are advised of its
risk). Reasons for this recommendation are as follows:
. The tree partially uprooted sometime ago and additional uprooting, if not the failure
of the entire tree, can occur at anytime. The most prominent signs identifying that
uprooting has occurred include [I] the entire plane of the main trunk and canopy
leaning towards the east at an approximate 30-degree angle (see photo 4), and [2] at
the trunk's base, a large anchorage root opposite the lean is exposed and is
distinctly higher than the trunk's opposing side.
Wallis Ranch. Tassajara Road, Dublin
City oj Dublin Planning Division
Page 4 oj 12
David L. Babby, Registered Consulting Arborist
December 20, 2006
.
The tree displays symptoms of being in a state of perpetual decline as evidenced by
the sparse foliage throughout its canopy and poor shoot growth (see photo 3),
foliage that represents less than half of what a healthy oak would contain. Based
on my observations, I find that the tree is beyond repair and can be expected to
continue declining.
.
Decay is prevalent in two major leaders of the canopy, one being approximately 22
inches in diameter and growing towards the east, and the other being the most
central and upright leader with an approximate diameter of 16 inches. Combined,
they account for an estimated 40-percent of the total canopy, a portion that would
need to be removed in order to safely mitigate the risk of failure they present.
Consequently, the removal of such a major portion of this tree's canopy would
compromise its longevity at potentially significant levels.
4.4e Tree #523 (see photo 3, page A-3). This tree is a 35-inch diameter valley oak
that appears in overall good to fair condition and is worthy of retention. It is situated a
sufficient distance from the anticipated construction activities and its survival and
protection can be expected.
There are a few situations, however, that if left unattended, can predispose the tree to
premature decline. One involves the grade being raised and compacted over its root
zone, and thus, inhibiting the availability of oxygen and water to the roots.
Remediation measures should be employed to promote healthy root growth and
recommendations for doing so are presented in Section 5.0.
Another situation involves a girdling root2 seen at the base of where the root collar3
was cleared. To minimize the risk that the root presents, additional excavation of the
root collar is necessary to more fully expose the root and identify whether additional
girdling roots exist. Following excavation, the situation should be evaluated by an
individual certified by the International Society of Arboriculture (ISA) and any
necessary treatment measures prescribed and implemented.
2 A "girdling root" encircles others roots and/or the trunk and can lead to tree instability and/or decline.
3 Area at the base of a tree's trunk where the main trunk and anchorage (or scaffold roots) merge, often
depicted by a distinct swelling.
Wallis Ranch, Tassajara Road, Dublin
City of Dublin Planning Division
Page 5 of 12
David L. Babby, Registered Consulting Arborist
December 20. 2006
4.4f Tree #524 (see photos 6 and 7, page A-5). This 31-inch diameter valley oak
contains such extensive decay that large limbs and/or the entire tree can be expected to
fail at any time. My visual assessment reveals more than 60-percent of the main trunk
is decayed, while large cavities are present throughout the upper canopy. Based on this
information, I recommend that this tree is also immediately removed for public safety
purposes (and the current residents and users of the property are advised of its risk).
I have reviewed the discussion and options within the "Arborist Tree Assessment
Report" regarding retaining this tree. Given the significant amount of residents and
others that will be living and recreating in the vicinity; including children that will be
unable to read any warning signs and can access the restricted area, it is my opinion
that the most prudent course of action involves removing the tree. If desirable,
portions of the tree could be relocated to other areas as discussed within the "Arborist
Tree Assessment Report."
4.5 Trees #528, 531 and 572
Tree #528 is a 15-inch diameter valley oak situated immediately adjacent to tree #527, a
taller and more dominant tree (trees #527 and 528 grow so close together they can be
regarded as a single tree). Its canopy grows nearly horizontal towards the direction of the
bridge and then ascends more vertically when it extends beyond tree #528's canopy. Due
to its growth, several branches will require pruning to achieve adequate clearance for the
bridge. In doing so, and assuming the pruning is properly performed, I do not expect the
tree to be adversely impacted and any immediate concern of its lean would be addressed.
Tree #531 is a 17-inch diameter willow tree that has partially uprooted and will be
removed to accommodate the southern bridge crossing. There is a typographical error
within the "Arborist Tree Assessment Report" identifying this tree as a valley oak; the
future plans should indicate a willow.
Tree #572 is a very large and dead valley oak that should be. removed for safety purposes
given its proximity to the bridge. I estimate its trunk diameter to be about 37 inches;
please note the 7-inch trunk diameter identified for this tree within the "Arborist Tree
Assessment Report" is a typographical error.
Wallis Ranch. Tassajara Road, Dublin
City of Dublin Planning Division
Page 6 of 12
David L. Babby, Registered Consulting Arborist
December 20, 2006
4.6 Tree Landscape Design
Sheet L2 identifies that Raywood Ash (Fraxinus o. 'Raywood') would be installed as
street trees within "Neighborhood 3." Unfortunately, this species of ash is extremely
vulnerable to branch dieback (called "Ash Dieback") and has a very short life expectancy.
As a result, I recommend Fraxinus a. 'Autumn Purple' be considered as an alternative.
Regarding Coast live oaks and Valley oaks proposed for installation along Tassajara Road
and east of the bridge crossings (outside the riparian zone), I recommend they are, at a
minimum, of the larger size shown on Sheet L2 (i.e. 15-gallon for Coast live oaks and 24-
inch box for Valley oaks).
5.0 TREE PROTECTION GUIDELINES
The recommendations presented within this section should be carefully followed and
incorporated into construction plans. They are based on plans reviewed and serve as
guidelines to help mitigate impacts to trees being retained and achieve compliance with the
City's Municipal Code. Please note that any or all recommendations are subject to
revision upon reviewing any additional or revised plans.
5.1 Design Guidelines
1. Trenching beneath the trees' canopies should be avoided, to include, but not limited to,
drainage purposes, underground utility/service installation, irrigation and landscape
lighting. In the event this is not possible, the City should be consulted to review the
situation and, if necessary to mitigate the impacts, recommend alternative installation
methods.
2. Any footpaths or walkways beneath the trees' canopies should be established entirely
on top of existing soil grade, including any edging or forms. If a vertical soil cut is
needed, it should not exceed four inches below existing soil grade. I also suggest that
compaction of the existing soil surface is avoided; the base material can be compacted
but should not exceed 80-percent density.
3. The permanent and temporary drainage design for the project must not require water
being discharged beneath or towards the trees' canopies (unless discharged into the
Wallis Ranch, Tassajara Road. Dublin
City of Dublin, Planning Division
Page 7 of 12
David L Babby, Registered Consulting Arborist
December 20. 2006
existing creek). In addition, the terrain should not be altered in a manner that directs
stormwater runoff towards or beneath the trees' canopies.
4. The following should be incorporated into the final set of project plans, titled Sheet T-l
(Tree Protection Instructions), and referenced on all site related plans: [I] Section 5.0
of this report and [2] the 'Tree Condition Chart' within the "Arborist Tree Assessment
Report."
5. Upon availability, the grading and drainage, underground utility, and future landscape
plans (both planting and irrigation) should be reviewed for tree related impacts.
6. Pursuant to Section 5.60.100 of the City's Municipal Code, "the applicant shall
guarantee the protection of the existing tree(s) on the site not approved for removal
through placement of a cash bond or other security deposit in the amount based upon
the valuation of the trees acceptable to the Director. The Director may refer to a city-
selected arborist to estimate the value of the tree(s) in accordance with industry
standards." For this project, I recommend the bond is collected prior to issuing permit
and apply to the following oak trees with trunk diameters greater than 24 inches and in
very close proximity to the proposed construction: #511-514 and 523. These appraised
values can be provided upon request and shall adhere to the Guide for Plant Appraisal,
9th Edition, published by the International Society of Arboriculture (ISA), 2000.
7. I am advised that revegetation measures proposed by the applicant's project team to
help minimize erosion along the creek banks have been verbally accepted by the
applicable resources agencies. These measures should be implemented to reduce the
risk of additional root exposure.
8. Native oaks should not be installed within or near a lawn setting (e.g. at least 10 feet
away) or watered through spray irrigation. Rather, the trees should be watered using a
drip or bubbler system placed on grade (and not in a sleeve) and in a manner that
allows the rootball to be properly watered; two or more emitters may be necessary to
accomplish this and the water should not be applied against the trunks. The irrigation
system should also be separate from that which supplies water to plants and shrubs
(due to water needs differing between trees and plants/shrubs).
9. The landscape design should incorporate the following additional guidelines regarding
activity beneath the trees' canopies:
Wallis Ranch, Tassajara Road, Dublin
City of Dublin Planning Division
Page 8 of 12
David L Babby. Registered Consulting Arborist
December 20, 2006
a. Plant material, grasses, turf, irrigation lines and new trees should not be installed
beneath a tree's canopy.
b. Stones or mulch shall not be piled against the trunks of existing or new trees.
Plastic ground cover should be avoided beneath canopies and mulch should not
exceed a four-inch layer.
c. Tilling beneath the canopies should be avoided, including for weed control.
d. Bender board or other edging material proposed beneath the trees' canopies should
be established on top of existing soil grade.
5.2 Protection Measures before, during and after Development
10. Prior to site demolition and clearing, a pre-construction meeting shall be held on-site
with the project arborist, project manager and superintendent. The intent is to review
trees being removed, work procedures, protection fencing locations, limits of grading,
staging areas, routes of access (including mitigation for the temporary access road
along trees #511-514), cleanout pits, mulching, watering, demolition work, and any
other required protection measures.
11. Prior to the aforementioned meeting, the limits of grading and the edge of the
temporary construction access road should be staked.
12. Tree protective fencing shall be installed prior to any demolition, grading, surface
scraping or heavy equipment operating near trees. It shall restrict access beneath a
tree's canopy and its placement shall be prescribed and authorized by the project
arborist. The fencing must be maintained throughout development and at no time shall
it be opened or relocated without City approval. Due to site topography, fencing
materials will vary and consist of either [1] orange plastic fencing; [2] chain link
panels; or [3] six-foot high chain link mounted on eight-foot tall, two-inch diameter
steel posts that are driven 24 inches into the ground and spaced no more than 10 feet
apart. Please note that the type of fencing materials and locations can be discussed,
reviewed and agreed upon during an on-site meeting between H.T. Harvey &
Associates, Ralph Osterling Consultants and the City.
13. Unless otherwise approved, all construction activities must be conducted outside the
designated fenced areas (even after fencing is removed) and outside from beneath the
canopies of trees identified or not identified within this report or the "Arborist Tree
Assessment Report." These activities include, but are not limited to, the following:
Wallis Ranch, Tassajara Road, Dublin
City of Dublin Planning Division
Page 90f 12
.----""-"-
David L Habby, Registered Consulting Arborist
December 20, 2006
demolition, grading, stripping of topsoil, trenching, equipment cleaning,
stockpiling/dumping of materials, and equipment/vehicle operation and parking.
14. Demolition of the existing sheds and removal of boulders beneath the canopies of trees
#523,525 and 5264 shall be performed at the direction of the project arborist.
15. Prior to the installation of protective fencing, I recommend the following items
regarding tree #523 are implemented and all work performed under the direction of an
ISA Certified Arborist:
a. Prior to performing items b thru d below, the tree's root collar should be further
excavated to expose the entire anchorage (scaffold) roots and girdling root(s); in
doing so, I encourage a pneumatic air device (e.g. an Air-Spade@) is used to
minimize root and trunk damage during process. The arborist should then examine
the exposed area for possible infection by harmful root-rotting organisms and
determine whether the girdling root(s) must be cut.
b. Trenches of 4- to 6-inches wide, 14- to 16-inches deep shall be dug in a radial
fashion from about three feet from the trunk to the perimeter of the canopy. The
trenches should be spaced apart every 10 feet at the perimeter and backfilled with
organic compost.
c. A four-inch layer of coarse wood chips (such as '!.- to 'I.-inch in size) shall be
manually spread and maintained (i.e. replenish as needed) beneath the canopy; the
chips should be kept at least 12 inches from the trunk.
d. Approximately 350 gallons of water should be supplied via a deep-root feeder and
evenly distributed to the area beneath the tree's canopy.
16. Prior to demolition commencing, a four-inch layer of coarse wood chips should also be
spread beneath the canopies of trees #525 and 526; the chips should remain at least 12
inches from the trunk.
17. The recommendations presented within line numbers 10 thru 13 of the 'Tree Condition
Chart' (page 10 of the "Arborist Tree Assessment Report") for trees 511 thru 514 shall
be implemented prior to equipment traveling along the construction access area. In
doing so, I recommend the following: [1] the wood chip pile be at least 12 inches high
and maintained throughout development, [2] chain link fencing is established at least
4 Tree #526 is not identified within the "Arborist Tree Assessment Report" but is situated immediately south
of tree #525 and in close proximity to the existing shed.
Wallis Ranch, Tassajara Road, Dublin
City of Dublin Planning Division
Page J 0 of J 2
David L. Babby, Registered Consulting Arborist
December 20, 2006
six feet from their trunks, [3] straw wattles or bales placed against and on the outside of
the fencing, and [4] steel plates are used.
18. Prior to issuing demolition or grading permits, a signed letter containing the following
information should be prepared by the project arborist and faxed to the City's Planning
Division: that protection fencing is established and recommendations prescribed for
tree #523 (see item 15 of the previous page) have been implemented. I also recommend
the fencing locations are delineated on a site plan and submitted to the City.
19. The project arborist should visit the site every month to verify compliance with tree
protection measures and to provide ongoing recommendations as needed. Any
significant findings or recommendations should be documented on a letter and a copy
faxed to the City's Planning Division.
20. The project arborist shall also be retained to directly supervise development activities
authorized within the designated fenced areas, and to prepare a comprehensive "final
tree preservation report" following completion of the construction phase. A copy of
the report should be submitted to the City and recommendations suggested within the
report employed by the applicant or owner.
21. Unless otherwise authorized by the City, any authorized trenching or digging beneath a
tree's canopy and 35 feet from tree #523's trunk shall be performed by hand or the use
of handheld equipment.
22. Except for constructing support structures for the bridge, in which no significant roots
of retained trees are expected, roots encountered with diameters of two inches and
greater should be retained, protected, and reported to the project arborist. The retention
or removal of the roots will be at the discretion of the arborist.
23. All existing leaf litter (mulch) inside the designated fenced areas should remain in
place throughout development and beyond. Any new mulch material installed during
landscaping should be placed on top.
24. Each recommendation within Section 5.1 of this report that pertains to site
development shall also be followed.
25. Great care must be taken by equipment operators to position their equipment to avoid
the trunks and branches of trees.
Wallis Ranch, Tassajara Road, Dublin
City of Dublin Planning Division
Page 11 of 12
David L. Babby, Registered Consulting Arborist
December 20, 2006
26. All ivy should be cleared off and away from the trees' trunks by at least two feet. The
removal of ivy, plants or shrubs beneath a tree's canopy should be manually performed
with great care taken to avoid excavating soil during the process.
27. Throughout construction during the months of May thru October, water should be
supplied to trees impacted by development activities. The methodology, frequency and
amounts should be prescribed by the project arborist.
28. The pruning and removal of trees shall be performed under the supervision of an ISA
Certified Arborist. All pruning shall abide by ISA standards and be limited to the
removal of deadwood one-inch and greater, encroachments, and reduction of heavy
limb weight.
29. Existing trees overhanging any unfenced areas where individuals may walk or recreate
should, prior to final inspection, be [I] evaluated by an ISA Certified Arborist and [2]
pruned if deemed necessary to eliminate a potential hazard.
30. Any stump being removed beneath the canopy of a retained tree should occur using a
stump grinder rather than being pulled up with an excavator. Please note that this
recommendation is not intended to mandate the removal of any particular stump but
merely to serve as a guideline to avoid causing unnecessary root damage to retained
trees in the event a stump is removed.
31. To achieve the greatest assurance of proper installation, all new trees shall be installed,
including necessary irrigation, by an experienced and knowledgeable state-licensed
landscape contractor. The work shall be performed to professional industry standards.
32. All new trees shall be inspected by the City of Dublin to ensure they are suitable for
long-term and stable growth and free of any obvious, abnormal defects.
33. The disposal of harmful products (such as chemicals, oil and gasoline) is prohibited
beneath canopies or anywhere on site that allows drainage beneath or near canopies.
34. Herbicides should not be used beneath the trees' canopies; where used on site, they
should be labeled for safe use near trees.
Wallis Ranch. Tassajara Road, Dublin
City of Dublin Planning Division
Page 12 of 12
David L Babby. Registered Consulting Arborist
December 20. 2006
EXHIBIT A:
PHOTOGRAPHS
Wallis Ranch. Tassajara Road. Dublin
City of Dublin Planning Division
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