HomeMy WebLinkAbout260622 Arborist Report - 520 Great Pond Road - - 500 GREAT POND ROAD Eis,
CONSULTING GROUP
Notice Of Intent Review
North Andover Country Club
For
North And,over Conservati on Commission
Project located at
520 Great Pond Road
North,Andover, MA 01845
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Why did SavATree Review The Notice Of Intent.?...........................................................................................................1
How ® SavATree Conduct the Assessment.?..................................................................................................................1
Whatdid SavATree Find.?........................................................................................................................................................4
What does SavATree Recommend Based on Our Findings.?.......................................................................................7
Photographs...........................................................................................................................................................................10
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The conservation commission is concerned that removing trees adjacent to the shoreline of Lake
Cochichewick may impact the water quality. The lake is the Town's sole source of drinking water.
SavATree will provide a site visit and a written report of findings, including risk mitigation
recommendations, tree health and management options.
Tree data was collected using TreePlotter, a cloud-based GIS system designed for data collection and
tree inventory hosting using a tablet.
The data collected consisted of:
• Trunk diameter
• Age
• Risk
• Species, common name
• Recreational grade GPS coordinates
• Site photos
• Condition—excellent, good, fair, poor, critical, dead
Diameter at Breast Height(DBH)was measured with a diameter tape at four and a half feet above grade
and rounded to the nearest half inch.
Recreational grade GPS coordinates and photos were taken with a tablet.
Condition was assessed using the following criteria:
Excellent — Tree is of exceptional health and vigor for species. There are no structural defects, or
significant asymmetry in the canopy. There is no visible damage to the trunk or fronds. Foliage is of
excellent appearance for species.
Good—The vigor is normal for the tree species with minor twig dieback. Defects are minor and easily
corrected. The canopy may have minor asymmetry which could be due to pruning for clearance.
Fair—The vigor is normal or reduced. There is an accumulation of dead fronds or tissue. Defects are
present in the canopy that may or may not be correctable. There may be an active pest infestation. The
canopy has been reduced or is asymmetrical.
Poor—The tree is in decline and likely will not recover. The foliage quality and color are poor. Dead
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or missing fronds make up over 50 percent of the tree canopy. There may be serious structural
deficiencies in the tree.
Critical—The tree is functionally dead,with less than 25 percent of canopy left alive.The tree has very
low vigor and is not expected to recover.
Dead—Little to no indication of life.
The targets considered for this assessment were golf course employees and course members.
We followed the national tree care industry consensus standard for tree risk assessment and
performed a Level 2 Basic Tree Risk Assessment. The Level 2 Basic Tree Risk Assessments included
a 360-degree, ground-based visual observation of the tree and above ground tree parts.
The tree risk assessment is a qualitative assessment based upon the premise of likelihood of failure
and impact x consequences=risk. Tree risk assessments include the site,potential targets and an
evaluation of the tree and visible defects. Tree risk ratings were assigned in accordance with ANSI
A300 Clause 131 and using the Tree Risk Assessment Manual2 as a guide.
Two matrices are used to work through the risk assessment process. The period we are considering is
one year. That is,the likelihood of a failure event occurring is considered for one year from the time of
our inspection.
To evaluate the likelihood of failure and impact, a likelihood matrix is used (Table 1). The following
are guidelines for the likelihood of the tree or tree parts failing:
Imminent—Is occurring or will occur soon in the absence of a storm.
Probable—May be expected under normal weather conditions in the specified time frame(three years).
Possible—May be expected under extreme weather.
Improbable—Not likely to fail under normal weather and may not fail under extreme weather.
1 Tree Care Industry Association,INC.ANSI A300 Tree Care Standards for trees,shrubs,palms and other woody landscape plants
(Clause 13).Tree Care Industry Association,INC,Manchester,NH.2023.
22 J.A.Dunster,E.T. Smiley,N.P.Matheny,and S.Lilly.2013.Tree Risk Assessment Manual.International Society of
Arboriculture.Champaign,IL.
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Table 1.Likelihood of failure and impact matrix.
Likelihood matrix
Very low Low Medium High
Imminent Unlikely Somewhat likely Likely
Probable Unlikely Unlikely Somewhat likely Likely
Possible Unlikely Unlikely Unlikely Somewhat likely
Improbable Unlikely Unlikely Unlikely Unlikely
The following are guidelines for the likelihood of impact:
Very Low—Chance of contacting specified target is remote. The target may be outside the anticipated
target zone or if occupancy rates are rare.
Low—There is a slight chance of target impact. This is the case for people in an occasionally used
area with no protection factors and no predictable direction of fall, a frequently used area that is
partially protected, or a constant target that is well protected from the assessed tree.
Medium—Could impact target but is not expected. This is the case for people in a frequently used area
when the direction of fall may or may not be toward the target.
High—Failed part is likely to impact the target. This is the case when there is a constant target with no
protection factors, and the direction of fall is toward the target.
Table 2.Risk Rating matrix.
Risk Rating Matrix
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Negligible Minor Significant Severe
Very likely Moderate
Likely Moderate
Somewhat likely Moderate Moderate
Unlikely
Consequences of failure are defined as:
Negligible—No personal injury, minor property damage, and service disruptions easily restored.
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Minor—Slight personal injury, low-moderate value property damage, and limited-service disruption
Significant— Substantial but not life-threatening personal injury, moderate-high value property
damage, or prolonged service disruptions.
Severe—Serious and possible life-threatening personal injury,high value property damage, and major
service disruptions.
We visited the North Andover Country Club located at 520 Great Pond Road, North Andover, MA on
May 28, 2026. The subject trees are adjacent to the bank of Lake Cochichewick and adjacent to the
9th Fairway. There is also a black willow (Salix nigra) adjacent to the lake and two areas of
speckled alder (Alnus rugosa)proposed for vegetation management.
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Figure 1.Site map.
The trees are numbered and the red circled areas are the speckled alder locations. There was staining
observed on some of the trees showing how high the water level went up the shoreline.
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Table 3.Tree Inventory Data Table
1 Black oak Quercusvelutina Fair Alive 30 Mature
2 Shagbark hickory Carya ovata Good Alive 5 Young
3 Shagbark hickory Carya ovata Good Alive 6 Young
4 Shagbark hickory Carya ovata Good Alive 2 Sapling
5 Shagbark hickory Carya ovata Good Alive 2 Sapling
6 Red maple Acer rubrum Fair Alive 5.3 Young
7 Red maple Acer rubrum Fair Alive 10.6 Early-Mature
8 Shagbark hickory Carya ovata Fair Alive 4 Sapling
9 River birch Betula nigra Fair Alive 15 Early-Mature
10 Shagbark hickory Carya ovata Dead Alive 4 Sapling
11 Shagbark hickory Carya ovata Fair Alive 8 Early-Mature
12 Shagbark hickory Carya ovata Fair Alive 8 Early-Mature
13 Shagbark hickory Carya ovata Good Alive 11 Early-Mature
14 Shagbark hickory Carya ovata Poor Alive 1 Sapling
15 Shagbark hickory Carya ovata Fair Alive 4 Sapling
16 Shagbark hickory Carya ovata Good Alive 2 Sapling
17 Shagbark hickory Carya ovata Fair Alive 1 Sapling
18 Shagbark hickory Carya ovata Fair Alive 1 Sapling
19 Shagbark hickory Carya ovata Dead Alive 1 Sapling
20 Black oak Quercus velutina Dead Alive 2 Sapling
21 Red maple Acer rubrum Fair Alive 7 Early-Mature
22 Shagbark hickory Carya ovata Poor Alive 1 Sapling
23 Shagbark hickory Carya ovata Dead Alive 1 Sapling
24 Shagbark hickory Carya ovata Dead Alive 1 Sapling
25 Black oak Quercusvelutina Fair Alive 6 Early-Mature
26 Shagbark hickory Carya ovata Fair Alive 8 Early-Mature
27 Shagbark hickory Carya ovata Dead Alive 3 Sapling
28 White ash Fraxinus americana Very Poor Alive 8 Sapling
29 White ash Fraxinus americana Poor Alive 21 Mature
30 European white birch Betula pendula Poor Alive 20 Mature
31 European white birch Betula pendula Fair Alive 9 Early-Mature
32 European white birch Betula pendula Poor Alive 6 Early-Mature
33 Yellow birch Betula alleghaniensis Fair Alive 9 Early-Mature
34 Norway maple Acer platanoides Fair Alive 17 Mature
35 Black oak Quercusvelutina Dead Alive 14 Mature
36 Red maple Acer rubrum Dead Alive 18 Mature
37 Black willow Salix nigra Poor/fair Alive 24 Mature
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Table 4.Summary of wetland status and tree risk assessment.
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1 Black oak Obligate Upland Low
2 Shagbark hickory Facultative Upland Low
3 Shagbark hickory Facultative Upland Low
4 Shagbark hickory Facultative Upland Low
5 Shagbark hickory Facultative Upland Low
6 Red maple Facultative Low
7 Red maple Facultative Low
8 Shagbark hickory Facultative Upland Low
9 River birch Obligate Wetland Low
10 Shagbark hickory Facultative Upland Low
11 Shagbark hickory Facultative Upland Low
12 Shagbark hickory Facultative Upland Low
13 Shagbark hickory Facultative Upland Low
14 Shagbark hickory Facultative Upland Low
15 Shagbark hickory Facultative Upland Low
16 Shagbark hickory Facultative Upland Low
17 Shagbark hickory Facultative Upland Low
18 Shagbark hickory Facultative Upland Low
19 Shagbark hickory Facultative Upland Low
20 Black oak Obligate Upland Low
21 Red maple Facultative Low
22 Shagbark hickory Facultative Upland Low
23 Shagbark hickory Facultative Upland Low
24 Shagbark hickory Facultative Upland Low
25 Black oak Obligate Upland Low
26 Shagbark hickory Facultative Upland Low
27 Shagbark hickory Facultative Upland Low
28 White ash Facultative Low
29 White ash Facultative Moderate
30 European white birch Facultative Moderate
31 European white birch Facultative Low
32 European white birch Facultative Low
33 Yellow birch Facultative Low
34 Norway maple Obligate Upland Low
35 Black oak Obligate Upland Moderate
36 Red maple Facultative Moderate
37 Black wi[low Obligate Low
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Jill
Jill
1 Black oak Obligate Upland Low Preserve tree
2 Shagbark hickory Facultative Upland Low Preserve tree
3 Shagbark hickory Facultative Upland Low Preserve tree
4 Shagbark hickory Facultative Upland Low Preserve tree
5 Shagbark hickory Facultative Upland Low Preserve tree
6 Red maple Facultative Low Preserve tree
7 Red maple Facultative Low Preserve tree
8 Shagbark hickory Facultative Upland Low Preserve tree
9 River birch Obligate Wetland Low Preserve tree
10 Shagbark hickory Facultative Upland Low Reovetree
11 Shagbark hickory Facultative Upland Low Preserve tree
12 Shagbark hickory Facultative Upland Low Preserve tree
13 Shagbark hickory Facultative Upland Low Preserve tree
14 Shagbark hickory Facultative Upland Low Preserve tree
15 Shagbark hickory Facultative Upland Low Preserve tree
16 Shagbark hickory Facultative Upland Low Preserve tree
17 Shagbark hickory Facultative Upland Low Preserve tree
18 Shagbark hickory Facultative Upland Low Preserve tree
19 Shagbark hickory Facultative Upland Low Remove tree
20 Black oak Obligate Upland Low Remove tree
21 Red maple Facultative Low Preserve tree
22 Shagbark hickory Facultative Upland Low Preserve tree
23 Shagbark hickory Facultative Upland Low Remove tree
24 Shagbark hickory Facultative Upland Low Remove tree
25 Black oak Obligate Upland Low Preserve tree
26 Shagbark hickory Facultative Upland Low Preserve tree
27 Shagbark hickory Facultative Upland Low Remove tree
28 White ash Facultative Low Remove tree/snag
29 White ash Facultative Moderate Remove tree/snag
30 European white birch Facultative Moderate Remove tree
31 European white birch Facultative Low Preserve tree
32 European white birch Facultative Low Preserve tree
33 Yellow birch Facultative Low Preserve tree
34 Norway maple Obligate Upland Low Preserve tree
35 Black oak Obligate Upland Moderate Remove tree/snag
36 Red maple Facultative Moderate Remove tree/snag
37 Black willow Obligate Low Preserve tree-prune
Table 5.Wetland status,risk rating and recommendations.
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The trees adjacent to the lake shore are prone to infrequent to occasional flooding.A Facultative
Upland(FACU) plant is a category used in ecology and botany to classify vegetation that usually
occurs in non-wetlands (dry or upland areas)but is occasionally found in wetlands. Statistically, these
plants have an estimated 67%to 99%probability of being found in non-wetlands, and a 1%to 33%
probability of being found in wetlands (Example: shagbark hickory).A Facultative (FAC)plant is
equally likely to occur in wetlands and non-wetlands. Statistically,these plants have an estimated
probability 34%—66% of being found in non-wetlands or wetlands (Example: red maple). Most of the
trees surveyed are in one of these two wetland indicator status.
In my opinion, most of the tree species can tolerate infrequent to occasional flooding. I am only
recommending dead trees be removed or managed for safety reasons. Small dead trees could be cut
close to grade leaving the stump in place. Larger dead trees could be left as wildlife snags, by leaving
the trunk in place.A wildlife snag is a standing dead or dying tree that provides vital habitat for birds,
mammals, insects, and amphibians. Healthy trees should be left to grow and help with erosion control,
water quality and wildlife habitat.
The groupings of speckled alder should not be "topped". Tree topping is cutting the main branches or
the top of the trunk back to stubs. This is highly discouraged by professional arborists. It starves the
tree, creates weak, hazard-prone regrowth, and invites rapid decay. Instead of topping,use reduction
pruning to shorten select branches back to a lateral limb creating a new leader. I would recommend not
reducing the height by more than 1/3 d.An ISA or Massachusetts Certified Arborist should do any
pruning activities.
In my professional opinion, replacing all the trees with shrubs is not ideal. Shrubs and herbaceous
plants should be used closer to the water and trees utilized adjacent to the high-water line. This
combination will help with erosion, water quality and increase wildlife habitat. If trees are required to
be removed that are viable, healthy and not a high risk, then they should be replanted inch per inch
(Example: 9"DBH tree removed=three 3" caliper trees planted).Any of the species listed in the
native shrub planting list are good choices. Tree species for replanting should be native and have the
proper wetland indicator status for the site location.
A tree risk assessment is not a guarantee that a tree will or will not fail under certain circumstances.
Living in and around living entities carries an inherent risk. Tree failures may be capricious
occurring with or without prior symptoms. This assessment attempts to categorize risk given known
site conditions, vulnerable targets and an interpretation of tree features and defects.
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This assessment should be considered valid for one year under normal weather conditions. We
recommend subsequent monitoring at that time interval, or sooner if conditions change.
Thank you so much for the opportunity to provide information for your project. Please let us know
if you have any questions,
Thomas O. Miles I Consulting Arborist
SavATree Consulting Group—New England
6,1,4S RC,A
plZmo,
ISA Certified Arborist#MA-5280A
ISA Tree Risk Assessment Qualified
Maryland Licensed Tree Expert#1836
Virginia Registered Consulting Forester
TMilesksavatree.com
v
781-336-1283
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