Correspondence 111,5 TZw 9-zoo 3 -..
HALSTEAD'S
ARBORICULTURE "Specialists in the care and
preservation of trees"
CONSULTANTS INC
' ` David Halstead, Consultant, B.S
Phillip Whitcomb, Consultant I f� .
• P.O. Box 1182 • Tualatin, OR 97062
1i (503) 245 -1383 JAN 2 �,, ;
ai r,Ln is , -
IP 1 April 7, 2006
Wingate Homes
,:, ;; • Attn: Mr. Barry Desbiens
P.O. Box 269
West Linn, OR 97068
. t TEL: (503) 657 -3300
FAX: (503) 657 -4646
‘N ' 1 , " Reference: Tree Evaluation
Location: Lots 1, 7, 09, 10, &12 — Locust Street Subdivision, Tigard, Oregon
Subject: Tree Assessment Report
Note . ; ' With your approval, I have inspected the site and proposed site plan for the Locust
Street Subdivision project located on SW Locust Street, Tigard, Oregon.
PURPOSE
d
The purpose of this inspection was to evaluate the preservation potential of
,) requested trees that could potentially be affected by construction. This study was
in accordance with the City of Tigard's Tree Ins completed Y Inspection Criteria as detailed
9 P
` A in the City Tree Preservation Ordinance - Chapter 18.790.
I have individually inspected, tagged, and numbered these specific trees utilizing
existing tree numbers both in the field and in this report for easy identification.
1 For each tree, I have included a "Tree Characteristics Guide" field report that will
explain in detail the species, tree measurements, and health and structural
conditions.
TREE ASSESSMENT
My inspection criteria included: tree species, canopy structure and development,
1 storm damage, insect and disease problems, overall structural integrity, root crown
and root system development, wind throw potential, and construction trauma
resistance. In addition, the tree trunk diameters were also measured at ground level
I, (DGL) in order to provide a more accurate reflection of tree trunk diameter where
construction excavation occurs.
Email: hac@spiritone.com
www. halsteadsarboriculture.
ccea 0068646
Page 2 of 4
April 7, 2006
Reference: Tree Evaluation
Location: Lots 1, 7, 8, 9, 10, &12 – Locust Street Subdivision, Tigard, Oregon
Subject: Tree Assessment Report
TREE ASSESSMENT - continued
There are a total of forty (40) specific trees located within the project boundaries that
are identified for evaluation. Of these trees, there are twenty -three (23) trees that
are identified as hazardous due to existing structural problems, wind throw potential
and /or poor health.
The remaining seventeen (17) trees are identified as preservable, provided they
receive professional pruning and therapeutic care before, during, and after project
construction activities. These trees are relatively healthy and structurally stable.
Hazardous Trees:
All of the following trees are listed as hazardous due to severe trunk and limb
splitting, dead trunks and dead limbs, decay and wounds, and other structural
problems that are un- repairable. If additional information is required conceming an
individual trees health and structural condition, please refer to the attached "Tree
Characteristics Guides" for individual trees.
Hazardous trees are listed as follows:
Lot 1 – Tree Number 2007, 2008, 2009, 2010, 2011 & 2014
Lot 7 – Tree Number N/A
t 8 /Tree Num 2147 & 2151
Lot 9 – Tree Number 2096, 2097, 2103, 2104 & 2106
Lot 10 – Tree Number 2072, 2073, 2074, 2091, 2092, 2093 & 2095
Lot 12 – Tree Number 2383A, 2383C & 2383D
Preservable Trees:
Trees that are preservable are as follows:
Lot 1 – Tree Number 2012 & 2013
Lot 7 – Tree Number 2162, 2163 & 2171 _ C 6Ajji—
Lot 8 – Tree Number 2148, 2149, 2152 & 2153)
L
ot a– Tree Number 2098, 2099, 2T05 2154 & 2155
Lot 10 – Tree Number 2076
Lot 12 – Tree Number 2383 & 2383B
If these trees are to be preserved, it is our recommendation that they be preserved
under the following Tree Care and Preservation guidelines.
Page 3 of 4
April 7, 2006
Reference: Tree Evaluation
Location: Lots 1, 7, 8, 9, 10, &12 — Locust Street Subdivision, Tigard, Oregon
Subject: Tree Assessment Report
TREE CARE AND PRESERVATION
MEETINGS:
Before the site clearing and construction begins, a pre- construction tree preservation
conference will be held on site with the general contractor in charge of tree removal,
and /or in charge of heavy equipment, the resident Certified Arborist and those official
representatives who have interest in the project.
PURPOSE:
The purpose of the on -site meeting will be to introduce all parties to the
specifications and sensitivity needed in the protection and preservation of trees, their
environment, and protected areas.
PREPARATION t FENCING:
It is critical that tree protection fencing be installed around all preserved trees before
any construction /excavation work begins. Tree protection fencing helps to ensure
that the root zones of preserved trees are not accidentally compacted or excavated.
The fencing needs to be attached to 7 -foot tall steel fence posts placed eight feet
apart on center forming a protective line around the preserved trees. Fence posts
need to be securely anchored in the soil to a depth of two feet.
Once the fence has been established, it cannot be adjusted or removed without the
consent of the Consulting Arborist. The fencing will need to be maintained
throughout the entirety of the project.
REMOVALS:
Those trees that are structurally unsound, unhealthy, or removed within the
preservation areas, will need to be removed under the direct supervision of the
Consulting Arborist for this project.
Tree removal will be done in such a way so as not to damage preserved trees and
their root zones. Removal of these trees may require climbing the trees and taking
them down in small pieces. Stumps of the removed trees, which are Tess than 15 feet
from a preserved tree, will be ground -out using a stump grinder.
Page 4 of 4
April 7, 2006
Reference: Tree Evaluation
Location: Lots 1, 7, 8, 9, 10, &12 — Locust Street Subdivision, Tigard, Oregon
Subject: Tree Assessment Report
ROOT PRUNING:
Excavation when using backhoe, trackhoe, or other mechanical device will be done
facing the tree (perpendicular to the roots) rather than along side of the tree (across
the roots). Furthermore before excavation begins, "Air Spade" bridging and tunneling
will be considered; especially if tree roots are found to be in excess of 2 inches in
diameter.
THERAPEUTIC CARE:
Therapeutic care is described as those treatments that will be needed to increase the
preserved trees chances for survival. In order to accomplish this objective, the trees
will have to be periodically inspected during the construction process by the project
consulting arborist.
Treatments are based on individual tree needs, their root zone, and structural
condition and health. Factors will be taken into consideration, such as species, soil
compaction, season in which construction is done, how much root zone will be
affected by construction, losses of surrounding native plantings and loss or changes
in surface and sub - surface water.
The success of any tree preservation project is based on good communication
between the General Contractor and the Consulting Arborist who will be on site
and /or on call for the entire project.
If I can be of further assistance and /or if more technical information is needed,
please contact me immediately.
Sincerely,
de..)
Philip C. Hickey, BS David W. Halstead, BS
Certified Arborist PN -1604A Certified Arborist CA#059
ASCA