HomeMy WebLinkAboutEx06_Arborist_Report,
January 26, 2020
Jim Howton
Phone 425 985-2024
Via email: Jimhjim1111@comcast.net
SUBJECT: PROPERTY AT 1501 KIRKLAND AVE NE - RENTON, WA
EXISTING TREE EVALUATION
Dear Jim,
I conducted a site visit at the above-referenced site on January 25 to evaluate the
overall health of each tree per the City of Renton's Municipal Code Section 4-4-130.
Following are the existing significant trees found on the site along with their species,
dbh, drip line (radius), overall health. See also Landscape Plan Sheet L-1.
4 significant trees were identified and assessed on the property. The species list is
below. According to City of Renton code, a significant tree is a “tree with a caliper of at
least six inches (6”), or an Alder or Cottonwood tree with a caliper of at least eight
inches (8”). Trees planted within the most recent ten (10) years shall qualify as
significant trees, regardless of the actual caliper.”
Each tree in this report was visited. Tree diameters were measured by the surveyor and
are shown in the table below and on the tree retention plan. Each tree was visually
examined for defects and vigor. The tree assessment procedure involves the
examination of many factors:
- The crown of the tree is examined for current vigor. This is comprised of
inspecting the crown (foliage, buds and branches) for color, density, form, and
annual shoot growth, limb dieback and disease. The percentage of live crown is
estimated for coniferous species only and scored appropriately.
- The bole or main stem of the tree is inspected for decay, which includes cavities,
wounds, fruiting bodies of decay (conks or mushrooms), seams, insects,
bleeding, callus development, broken or dead tops, structural defects and
unnatural leans. Structural defects includes crooks, forks with V-shaped
crotches, multiple attachments, and excessive sweep.
- The root collar and roots are inspected for the presence of decay, insects, and/or
damage, as well as if they have been injured, undermined or exposed, or original
grade has been altered.
A ‘viable’ tree is “a significant tree that a qualified professional has determined to be in
good health, with a low risk of failure due to structural defects, is wind firm if isolated or
remains as part of a grove, and is a species suitable for its location.” Tree considered
‘non-viable’ are trees that are in poor condition due to disease, age-related decline,
have significant decay issues and/or cumulative structural defects, which exacerbate
failure potential.
TREE RETENTION CALCULATION
A total of 4 significant trees were identified on the subject property, one of them is dead.
As shown in the City of Renton tree calculation worksheet, the dead tree is part of the
calculations. No Landmark trees were on the site. The property is within the
‘Residential-14’ (R-14) zoning code classification. 20% of existing viable significant
trees are required to be retained.
4 existing trees – 1 dead tree = 3 significant trees,
3 X 20% = 0.6 significant trees required to be retained.
1 existing significant tree is proposed to be retained.
SIGNIFICANT TREES ON SITE
TREE # SPECIES DBH DRIP LINE HEALTH REMOVED / RETAIN
001 Cedar 2x18" 12' dia. Good Retain
002 Cedar 10" 9' dia. Good Offsite
003 Douglas Fir 30" 20' dia. Good Offsite
004 Unknown 18" 0' Dead Remove
005 Cedar 16" 10' Good Offsite
006 Elm 10",15”,22” 15' Good Remove
007 Spruce 16” Varies Good Remove
There is no warranty suggested for any of the trees subject to this report.
Respectfully,
Jeff Varley
Landscape Architect
Varley Varley Varley
19819 30th Drive SE
Bothell, WA 98012