HomeMy WebLinkAboutPlanning 2017-06-22 Item 4 - Foster High School Expansion and Birth to Kindergarten - Attachment F: Tree Inventory and Disposition for B2K ProjectTree Inventory and Disposition for BY Project- Tukwila School District
The following tree inventory and disposition is based off of, and supplemental to, site plans
provided by NAC architecture. In most cases trees scheduled for removal are being removed
because of proximity to buildings, or construction disturbances, and where noted will be
removed for safety concerns. The dispositions were taken by use of a basic visual assessment,
and the inspection was non - invasive. Many trunks were heavily obscured by ivy and
undergrowth. The assessment time frame is one year from commencement of fieldwork, and
whole or partial failure of tree parts is based on the probability of failure under normal wind
and rain conditions.
Brandan Kriegel
ISA Arborist PN7550A
ISA Tree Risk Assessment Qualified Arborist
206 293 1869
Vitalitree Arborist Collective vitall *9021b
ATTACHMENT F
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FOSTER HIGH SCHOOL
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B2K Inventory — From Sheet 7
1) *Bitter cherry, Prunus emarginata, 6" DBH x 25', Retain. Mild phototropism with self corrected top, common
in species. No noted concerns.
*Bitter cherry, Prunus emarginata, 8 "x30', Retain. Mild phototropism towards lawn is common in species. Self
corrected top and relatively small size in addition to shared wind load characteristics with adjacent trees in same
cluster, no noted concerns.
*Bitter cherry, Prunus emarginata, 6 "x25',Retain. No noted concerns, enjoys production from neighboring trees
from wind conditions.
*Bitter cherry, Prunus emarginata, 8 "x30', Retain. Mild phototropism away from proposed lawn area is common
in species, and top is self corrected.
*Bitter cherry, Prunus emarginata, 8 "x2x25', Retain. Mild phototropism with self corrected top. No noted
concerns.
*Bitter cherry, Prunus emarginata, 6 "x25', Retain. Small diameter tree with mild and common phototropism, well
protected by surrounding Prunus stems.
*Big Leaf Maple, Acer macrophyllum, 6 "x30', Remove. Tropism towards potential targets in lawn area with higher
species profile failure rates than neighboring Prunus emarginata stems, greater genetic potential, and aggressive
growth rate.
2) *Black locus, Robinia pseudoacacia, 8 "x40', Remove. Trees encroach on to proposed lawn area and are.
outside of the protection of nearby trees and proposed plantings, making them more likely to impact a target in
the event of failure.
• Black locus, Robinia pseudoacacia, 10 "x45', Remove for same reasons as above.
*Black locus, Robinia pseudoacacia, 10 "x45', Remove for same reasons as above.
3) *Willow, Salix species, 6 "x5x24', Remove. Tree has one failed stem, and one dead stem, remaining stem has
approximately 15% dead branches and exhibits poor form.
4) • Silver poplar, Populus alba, 16 "x35'. Remove. 15 degree tropism towards garden area with half of canopy in
strike zone in event of failure.
5) • Black locus, Robinia pseudoacacia,6 "x42'. Retain. Very small, near full protection of wind loads from other
trees and same cluster.
6) *Black locus, Robinia pseudoacacia, 14 "x50'. Retain. Mild phototropism developed growing away from larger
row of trees off of site, with self- corrected top.
7) *Black locus, Robinia pseudoacacia, 12 "x45'. Retain. Tree exhibits no noted concerns, and healthy canopy, but
may be removed to accommodate establishing proposed landscape trees by improving light conditions for 2
nearby intended deciduous plantings.
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8) *Black locus, Robinia pseudoacacia, 12 "x45'. Retain. Healthy tree with no noted concerns, but may be
removed for same reasons as above.
9) *Black locus, Robinia pseudoacacia, 12 "x45'. Retain. Healthy tree, with no noted structural defects and
vigorous canopy growth. In the unlikely event of failure, neighboring tree and proposed plantings would greatly
reduce the possibility of the tree impacting a target.
10) *Black locus, Robinia pseudoacacia, 8 "x2x45'. Retain. No noted structural defects or concerns, enjoying
protection from wind stresses with other trees in cluster. Orientation further downhill makes impact of target on
playfield extremely unlikely in event of failure.
11) *Black locus, Robinia pseudoacacia, 11 "x45'. Retain. No noted structural defects or concerns. Mild
phototropism with self corrected top typical of species and growth conditions.
12) *Black locus, Robinia pseudoacacia, 12 "x50'. Retain. Slight tropism with self corrected top, and no noted
concerns.
13) *Black locus, Robinia pseudoacacia, 12 "x50'. Retain. Healthy canopy and branch structure with no noted
structural defects or concerns. The position of the tree further down the slope gives it similar protection to wind
forces as other trees in this group.
14) *Black locus, Robinia pseudoacacia, 6 "x40'. Retain. Tropism away from playfield with no noted structural
concerns or defects.
15) *Lombardi Poplar, Populus nigra, 12 "x55'. Retain. Very small and young tree with fastigate growth habit. No
broken, or dead branches, and no evidence of historical failure in canopy.
16) *Bitter cherry, Prunus emarginata, 14 "x35'. Retain. Trunk and lower canopy heavily obscured by ivy and
blackberries, who is healthy crown and favorable Branch structure, with mild tropism away from play field.
17) *Willow species, Salix, 12 "x20'. Remove. Multiple dead scaffold branches with poor form and previous
historical breakages.
18) *Bitter cherry, Prunus emarginata, 8 "x20'. Remove to improve conditions for proposed plantings.
19) *Alder, Alnus rubrum, 12 "x20. Remove. Tree has 50% dead branches, and dead top.
20) *Willow, Salix species, 14 "x24'. Remove. Multiple dead apical stems, and poor growth structure.
21) *Cottonwood, Populus trichocarpa, 16 "x42'. Retain. Located on steep slope. Tree exhibits favorable growth
structure, with no evidence of historical breakage in canopy. Mild tropism downhill, with prevailing wind forces
flowing away from target of playfield, and into greenbelt.
22) *Bitter cherry, Prunus emarginata, 12 "x40'. Retain. Tree is located on steep slope. Healthy canopy with no
notable concerns, or evidence of previous breakage. In the event of whole or partial failure the tree would likely go
down the hill with gravity and prevailing wind forces, away from play field.
23) *Willow, Salix species, 10 "x20'. Remove. Smaller tree with multiple dead parts and poor growth structure.
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24) • Cottonwood, Populus trichocarpa, 34 "x90'. Retain. Tree is located on steep slope, and is important for
stability and hydrology. No large dead branches or previous breakages in canopy, with drip -line barely over top of
steep slope in event of breakage.
25) • Cottonwood, Populus trichocarpa, 24 "x60'. Remove. Severe tropism towards play area, with previously
broken crown resulting in stag head growth with multiple large sprouts with poor ratio in relation to trunk size and
weak attachments. Evidence of historic breakage with similar parts still present.
26) • Willow, Salix species, 8 "x6 "x6 "x36'. Retain. Located several feet down on to steep slope, with healthy
canopy. No noted concerns.
27) *Black locus, Robinia pseudoacacia, 8 "x45'. Remove. Cannot be adequately protected during construction.
28) *Black locus, Robinia pseudoacacia, 6 "x30. Remove. Cannot be adequately protected during construction.
29) *Big Leaf Maple, Acer macrophyllum, 22 "x36'. Retain. No evidence of previous breakages, with healthy and
vigorous canopy and structure typical of its species. Outside of the Striking Distance of play area and foot traffic in
the unlikely event of partial failure.
30) *Black locus, Robinia pseudoacacia, 7 stems 8" and less x 30'. One 14 "x45' trunk. Remove. Trees are in
intended play area with engineered surface and must be removed.
Sheet 6, East Side of Page
1) *Big Leaf Maple, Acer macrophyllum, 18 "x40'. Remove. Tree cannot be adequately protected during
construction and is in middle of open play area.
2) *Big Leaf Maple, Acer macrophyllum, 12 "x14 "x40'. Retain. Healthy crown and canopy with favorable growth
structure and no evidence of previous breakage. Lower branches may need to be lifted to accommodate
construction equipment mobilization.
3) *Big Leaf Maple, Acer macrophyllum, 20 "x40'. Retain. Favorable grow structure, with healthy canopy and no
noted concerns or defects. Located on edge of sensitive slope and outside of striking distance of nearby targets
and play areas.
4) • Big Leaf Maple, Acer macrophyllum, 28 "x45'. Healthy appearance and structure with no evidence of previous
breakage, and no noted concerns. Well outside of the distance of any targets in the unlikely event of failure.
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