tree assessment report - london, ontario · report . city of london . 2017 infrastructure ....

TREE ASSESSMENT

REPORT

CITY OF LONDON 2017 INFRASTRUCTURE

LIFECYCLE RENEWAL PROGRAM

Beachwood Ave. from Commissioners Rd. W. to Southcrest Dr.

London, Ontario

Project Number: 2017 Local Draft Submission Date: April 2017

Final Submission Date: To be determined

Prepared by:

Ian Johnston - Senior Consulting Arborist ISA Certified Arborist # ON-0598A

ISA Tree Risk Assessment Qualification DAVEY RESOURCE GROUP

519.476.2460 [email protected]

In Association with:

231 Wellington Street, Suite 2

London, ON N6B 2L2 519.667.1422

www.aliermanla.ca

mailto:[email protected]

1

INTRODUCTION

In March 2017, Ian Johnston, Senior Consulting Arborist with Davey Resource Group, in association

with Arthur Lierman Landscape Architecture, undertook an assessment of the existing trees with

respect to tree health, structure and preservation for the City of London 2017 Infrastructure Lifecycle

Renewal Program Beachwood Avenue. The area assessed includes Beachwood Avenue from

Commissioners Road West to Southcrest Drive. An inventory and an assessment of the existing trees

were undertaken with consideration of the scope of work including the replacement of storm sewers,

sanitary sewers, watermain and water services, and roadway reconstruction including the replacement

of asphalt road, concrete curb and gutter, and concrete sidewalks.

TREE PROTECTION AND REMOVAL

Trees to be retained and to be removed were determined based on tree health and structural criteria

(see Tree Assessment Codes), a detailed site inspection (see Tree Inventory and Assessment Charts

T.1 - T.4), and the installation requirements for the road works. The Corporation of the City of London

supplied the site plans showing all existing tree and vegetation locations (see Tree Inventory

Photographs and Tree Preservation Plans TP.1 - TP.5 for tree identification numbers and locations).

An extensive review of the proposed site grading was undertaken which included consultations with

the project engineer.

No construction, stockpiling or heavy equipment will be permitted beyond the construction limit (see

Tree Protection Fence Detail TPF.1). All tree related activities including pruning and removals within

the construction area will be carried out by certified arborists who will ensure adjacent trees, to be

retained, are not damaged (see Construction Process Requirements). Trees to be removed have been

indicated with an appropriate symbol as shown on the Tree Preservation Plans TP.1 - TP.5.

Construction project potential impacts to trees:

1. Physical damage to branches, trunks, and roots of trees to be retained.

2. Local moisture loss which may result from a decline in the water table during and after

construction.

3. Compaction of soil in or near root zones.

SUMMARY

The above recommendations are established to enhance the survival of the trees to be retained. While

it is preferred and positive to retain as many trees as possible, some trees that are in poor condition,

are unsafe, are an undesirable species, or are in conflict with the proposed construction activity,

cannot and should not be saved. This project may or may not have trees requiring removal.

2

REQUIREMENTS

The successful survival of the trees to be retained on site is largely dependent on adhering to the

following requirements:

A. Construction Process Requirements

1. Prior to tree removal operations, all removals will be clearly marked (i.e. all trees

designated for removal to be marked with spray paint).

2. Care will be taken during the removals to avoid damaging the branches, trunks, and roots

of nearby trees to be retained. Where possible all trees are to be felled into the construction

zone to minimize impacts to adjacent vegetation.

3. Where the potential exists for soil compaction and root damage, a 100mm (4in.) min.

thickness protection layer of wood chips covered by 19mm (3/4in.) thick plywood will be

installed over the root zone. Alternatives to using plywood, such as interlocking steel plates

or plastic ground protection mats, may be installed over the wood chips. This process is

necessary when construction activities cannot be excluded from root zones.

4. Where the potential exists for damage to tree trunks, a layer of 50mmx100mm (2in.x4in.)

wooden cribbing encircled with wire shall be used to protect the tree from incidental contact

by large construction equipment (see Tree Trunk/Bark Protection Detail TTP.2).

5. Broken branches on trees to be retained will be properly pruned by a certified arborist as

soon as possible after the damage occurred.

6. Tree Protection Fencing will be installed under the supervision of a certified arborist and

maintained for the duration of the construction project.

7. No movement of equipment, construction activity, grade changes, surface treatment,

excavations or dumping of solvents, gasoline, etc. is permitted within the Tree Protection

zone (the Tree Protection Zone is the area inside the Tree Protection Fencing).

8. Where the roots of protected trees would be damaged by mechanical excavation, non-

invasive digging by hand, air excavation tool or hydro-vacuum equipment will take place.

Hydro-vacuum equipment must be operated as follows, to prevent root damage:

Maximum operating pressure 900psi until roots show, then 300-400psi to remove

soil around and under roots.

Water not aimed directly at roots.

Minimize contact with roots, keeping 150mm (6in.) away as much as possible.

This work is to be supervised by a certified arborist.

3

9. Once an adequate size of hole has been excavated by one of the non-invasive methods,

exposed roots need to be kept damp and protected from sun and wind until construction

work is complete. Back filling of the hole shall take place as soon as possible. Roots that

inhibit access of the hole for work activities may be pruned, only as needed, to access and

complete the work; this work is to be completed or supervised by a certified arborist.

10. Where installation of Private Drain Connections (PDCs) (sanitary or storm services and

curb stops or water services) by open-cut methods will adversely affect tree roots, the

contractor will install new services by trenchless methods (ie. boring and / or hydro vacuum

truck excavating), at locations directed by the Contract Administrator (Note: see hydro-

vacuum instructions in item #8).

11. If grade changes are required in areas adjacent to trees to be retained, work will be done to

minimize impacts to the trees. Tree wells, retaining walls or other site features will be

utilized.

12. Avoid running above ground and underground utility services near trees to be retained. If

unavoidable, utilize directional boring to install services below tree roots.

13. All excavated areas adjacent to trees to be retained will be adequately backfilled and

compacted with a native soil substrate layer and a topsoil top layer to eliminate air pockets

and match original conditions and grades.

14. Final site grading will ensure that surface water is discharged from the site and the existing

soil moisture conditions are maintained.

.

B. Post-Construction Requirements

1. After construction, upon the assessment of a certified arborist, deep root fertilizing and / or

watering may be required as a remedial action to enhance the growing conditions of a

tree(s) inadvertently injured by construction activities. This would include trees with

damage to the trunk or crown and damage to roots that are within the Tree Protection

Zones.

2. Avoid discharging rain water leaders adjacent to all trees to be retained. This may cause an

overly moist environment which will cause the tree roots to rot.

3. After all of the work is completed, the Tree Protection Fencing and other barriers will be

removed.

4. A final review must be undertaken by a certified arborist to ensure that all mitigation

measures as described above have been met.

4

TREE REMOVALS

The following trees are recommended to be removed. These recommendations considered the health,

structure, location, liability, and construction impacts which may occur on the existing trees (see Tree

Assessment Codes and Tree Inventory & Assessment Charts T.1 – T.4).

1. ID No. 8 – Norway Maple Mun. No. 209 Baseline Road West

2. ID No. 17 - Norway Maple Mun. No. 478 Beachwood Avenue

3. ID No. 35 – Norway Maple Mun. No. 426 Beachwood Avenue
















EXECUTIVE SUMMARY

It is the recommendation of this report that a Temporary Tree Protection Fence be installed as per the

attached Tree Preservation Plans TP.1 - TP.5. All excavations in conflict with existing trees to be

retained shall be undertaken using Trenchless and Hydro Vacuum methods to ensure there is little or

no damage to the root systems. The contractor is to make themselves familiar with all excavation

practices (refer to item #8 in Construction Process Requirements for more information regarding

hydro-vacuum use). A certified arborist is to be employed to carry out or supervise all tree related

activities.

5

TREE ASSESSMENT CODES

TREE HEALTH H1 Foliage normal colour H2 Foliage chlorotic (pale colour) H3 Foliage necrotic (dying / dead) H4 Foliage percent live crown ____% H5 Major pests / disease present H6 Growth obstructions (i.e. girdling vines, cables) CROWN / TRUNK DEFECTS C1 Codominant trunks / limbs C2 Included bark in forks C3 Multiple branch attachments (originating from one point on trunk) C4 Cracks / splits in trunk(s) / major limb(s): potential to fail C5 Major trunk wounds C6 Moderate trunk wounds C7 Major scaffold branch defects C8 Moderate scaffold branch defects C9 Major decay C10 Moderate decay C11 Extensive cavity C12 Moderate cavity C13 Bark loose / missing ROOTS R1 Exposed roots R2 Severed roots R3 Major girdling roots R4 Root rot suspected R5 Buttress area wounded / diseased / decayed ECO-SETTING Og Open grown Hr Hedgerow Fe Forest edge Fi Forest interior SIGNIFICANCE OF TREE S1 Very significant; major contribution to landscape; preserve S2 Very significant; major contribution to landscape; cannot preserve S3 Significant; important and would be missed; preserve S4 Significant; important and would be missed; cannot preserve S5 Not significant; not likely to be missed; preserve S6 Not significant; not likely to be missed; not necessary to preserve S7 Detrimental; no contribution; do not preserve

6

PROTECTION P1 Install fence at drip-line P2 Install fence within drip-line (certified arborist to supervise) P3 Install fence beyond drip-line ( ) metres P4 Install protective 100mm (4in.) min. thickness layer of wood chips over root zone P5 Install interlocking 19mm (3/4in.) min. thickness plywood panels over wood chips for a temporary roadway. Alternatives such as interlocking steel plates or plastic ground protection mats may be used P6 Install 2in. min. thickness by 8ft. min. height wooden cribbing or planks around trunk for protection from equipment. Use non-invasive means to secure protection to tree P7 Prune to allow construction equipment access and prevent damage to crown P8 Monitoring and remedial work by a certified arborist recommended during construction P9 Install permanent retaining wall to prevent disturbance of roots when lowering / raising grade P10 Transplant to holding area and replant after construction P11 Protect boulevard from soil/root disturbance

9

TREE INVENTORY & ASSESSMENT CHART T.1 Beachwood Ave., London, ON

ID No.

MUN. No. SPECIES DBH (mm)

CAN. (M)

HEALTH CROWN / TRUNK

DEFECTS SIG. PROTECTION

COMMENTS & RECOMMENDATIONS

1 279 Commissioners Rd. W. Norway Maple 379 10 C1 S3 P2

2 209 Gladman St. Norway Maple 449 10.6 C3 S3 P2, P7

3 209 Gladman St. Silver Maple 1053 16.4 C2, C3, C6, C12, R1

S3 P2

4 209 Gladman St. Silver Maple 35 1 C3 S3 P1

5 208 Gladman St. Norway Maple 9.7 S3 P2 Private tree

6 208 Gladman St. Norway Maple 509 12.4 C3, R1, R3

S3 P2, P7 HVAC roots east side to expose for root pruning for sidewalk installation

7 208 Gladman St. Norway Maple 557 12.1 C3, R1, R3

S3 P2, P7 HVAC roots east side to expose for root pruning for sidewalk installation

8 209 Baseline Rd. W. Norway Maple 549 10.6 C7, R1, R4, R5

S4 Construction conflict with sidewalk installation; REMOVE

9 209 Baseline Rd. W. White Birch 287 7.9 C3 S3 P2

10 209 Baseline Rd. W. White Birch 190, 200 5.8 C10 S3 P2

11 209 Baseline Rd. W. Norway Maple 524 10.6 C1, C3, R3

S3 P2

12 208 Baseline Rd. W. Silver Maple 35 1 S3 P1

13 208 Baseline Rd. W. White Cedar 487 6.1 H1 C1, C2 S3 P1

14 208 Baseline Rd. W. White Cedar 190, 220 6.7 H1 C1, C2, R1

S3 P2

15 208 Baseline Rd. W. Norway Maple 553 17 C3, C12, R1

S3 P2, P7

16 478 Beachwood Ave. Norway Spruce 9.7 S3 P1 Private tree

17 478 Beachwood Ave. Norway Maple 504 7.3 C6, C8 S4 Poor condition. Conflict with sanitary service & PDC; REMOVE

18 476 Beachwood Ave. Norway Maple 8.8 S3 P1 Private tree

19 476 Beachwood Ave. Linden 450 9.4 C2, C3 S3 P2, P7

20 472 Beachwood Ave. Linden 9.1 S3 P1 Private tree


22 470 Beachwood Ave. Norway Maple 509 13 C3, R1 S3 P1, P7

23 470 Beachwood Ave. White Spruce 4.5 S3 P1 Private tree

24 466 Beachwood Ave. Linden 10 S3 P1 Private tree

25 466 Beachwood Ave. Norway Maple 487 11.2 C3 S3 P2, P7

26 460 Beachwood Ave. Norway Maple 422 10.3 C3, C8 S3 P2, P7

27 456 Beachwood Ave. Norway Maple 504 13 C3, C8 S3 P2, P7



30 454 Beachwood Ave. Norway Maple 7 S3 P1 Private tree


32 450 Beachwood Ave. Weeping False Cypress

185 6.6 H1 S3 P1



35 426 Beachwood Ave. Norway Maple 511 14.2 C3, C8 S4 Construction conflict with major buttress roots; REMOVE

36 424 Beachwood Ave. Honeylocust 160 7.9 C2 S3 P1


10


ID No.


CAN. (M)




38 420 Beachwood Ave. Norway Maple 534 12.7 C3, C8 S4 Construction conflict with major buttress roots; REMOVE


40 414 Beachwood Ave. Sugar Maple 12.7 S1 P1 Private tree

41 414 Beachwood Ave. Norway Maple 540 13 C5 S4 Major trunk wounds. Construction conflict with storm drain; REMOVE

42 410 Beachwood Ave. Sugar Maple 14.2 S1 P1 Private tree

43 410 Beachwood Ave. Norway Maple 594 12.1 C3, C8, R3

S4 Trunk wound. Girding roots. Construction conflict with major buttress roots; REMOVE

44 408 Beachwood Ave. White Birch 105, 150,

190, 208

8.2 S1 P1


46 398 Beachwood Ave. Colorado Blue Spruce 10. H1 S3 P1 Private tree

47 394 Beachwood Ave. European Beech 45 1.6 C1, C2 S3 P1

48 392 Beachwood Ave. Norway Maple 588 15.2 C1, C3, C8

S3 P2, P7

49 388 Beachwood Ave. Linden 9.7 S3 P1 Private tree

50 386 Beachwood Ave. Norway Maple 445 8.5 C3, C8 S4 Construction conflict; REMOVE


S3 P2, P7

52 380 Beachwood Ave. White Birch 12.1 S1 P1 Private tree

53 380 Beachwood Ave. Sugar Maple 105 5.2 C1, C2 S3 P1


55 374 Beachwood Ave. Norway Maple 486 13 C1, C3, C8, C12

S3 P2, P7

56 370 Beachwood Ave. White Spruce 160, 180 5.8 H1 C1 S3 P1

57 370 Beachwood Ave. Norway Maple 628 12.7 C1, C3, C8, R1

S4 Exposed roots. Construction conflict with major buttress roots; REMOVE

58 366 Beachwood Ave. Colorado Blue Spruce 345 4.8 H1 S3 P1

59 366 Beachwood Ave. Colorado Blue Spruce 8.2 S1 P3 – Outside of cedar hedge

Private tree

60 364 Beachwood Ave. Norway Maple 510 11.8 C1, C3, C8, R1

S3 P2, P7


S4 Construction conflict; REMOVE



S3 P2, P7

64 350 Beachwood Ave. Norway Maple 555 14.2 C1 S3 P2

65 357 Beachwood Ave. Norway Maple 541 12.7 C1, C2 S4 Crown dieback & weak trunk configuration; REMOVE





70 373 Beachwood Ave. Linden 175 5.5 C1, C2 S3 P2


72 383 Beachwood Ave. Hackberry 150 4.8 C3 S3 P2

11


ID No.


CAN. (M)





S3 P2, P7



76 397 Beachwood Ave. Norway Maple 436 10.9 C1, C2 S4 Crown dieback. Trunk seam with potential to split; REMOVE

77 401 Beachwood Ave. Colorado Blue Spruce 7.3 S1 P1 Private tree

78 405 Beachwood Ave. Norway Maple 817 13.6 C1, C2, C3, C5, R3

S3 P2

79 407 Beachwood Ave. Norway Maple 160 5.2 C1, C3 S3 P2

80 413 Beachwood Ave. Colorado Blue Spruce 10 S1 P1 Private tree

81 413 Beachwood Ave. Norway Maple 608 14.2 C1, C3 S4 Construction Conflict with road widening, crown dieback; REMOVE



S3 P2, P7


85 423 Beachwood Ave. Crabapple 8.7 S3 P1 Private tree

86 425 Beachwood Ave. Norway Maple 452 10 C1, C2, C5

S3 P2, P7

87 425 Beachwood Ave. Norway Spruce 296 6.1 H1 S3 P1

88 433 Beachwood Ave. Willow 10.3 S3 P2 Private tree

89 433 Beachwood Ave. Norway Maple 352 8.2 S3 P2, P7

90 437 Beachwood Ave. Linden 70 1.7 S3 P2

91 439 Beachwood Ave. Lilac 50 1.5 S3 P1

92 439 Beachwood Ave. Red Oak 3.3 S1 P1 Private tree


94 445 Beachwood Ave. Norway Spruce 8.7 Private tree

95 453 Beachwood Ave. Norway Maple 399 12.4 C1, C2, C7, C8

S4 Low vigour, major scaffold branch defect, section over street, weakly attached, center section choked, construction impact; REMOVE

96

453 Beachwood Ave. Norway Spruce 8.5 S3 P1 Private tree


98 453 Beachwood Ave. Norway Maple 15.5 C1, R3 Construction conflict, seam in south section & a scaffold branch. Also, on that section girdling roots; REMOVE


100 465 Beachwood Ave. Japanese Flowering Cherry

7.6 S3 P1 Private tree

101

465 Beachwood Ave. Silver Maple 35 0.8 S3 P1


103 471 Beachwood Ave. Honeylocust 155 7.3 C1 S3 P2

104 475 Beachwood Ave. Norway Maple 541 12.4 C1 S4 Construction conflict; REMOVE

12


ID No.


CAN. (M)






S3 P2


108 489 Beachwood Ave. Norway Maple 453 14.2 C1, C8, R1

S3 P2, P7

109 489 Beachwood Ave. Colorado Blue Spruce 8.2 S1 P1 Private tree

110 230 Baseline Rd. W. Westminster School

Norway Maple 387 10.9 C1, R1 S3 P2

111 231 Baseline Rd. W. Norway Maple 293 7.9 C1 S3 P2, P7

112 227 Baseline Rd. W. Norway Maple 335 10.9 C1, R1 S3 P2, P7



115 493 Beachwood Ave. Norway Maple 395 10 C3 S3 P2, P7

116 497 Beachwood Ave. Norway Maple 379 8.5 C3, c7 S4 Tree in decline, girdling roots, significant dead wood, construction impact; REMOVE

117 505 Beachwood Ave. Norway Maple 559 13.6 C1, C2, C5, C8, R3

S4 Construction conflict, roots lifting s/w, significant defect in main crotch where three trunks meet; REMOVE





122 509 Beachwood Ave. Norway Maple 351 9.1 C3 S4 Significant decline; REMOVE




126 521 Beachwood Ave. Norfolk Island Pine 2 S3 P1 Private tree


13

TREE INVENTORY PHOTOGRAPHS

Beachwood Ave., London, ON

#1 Norway Maple – 279 Commissioners Rd. W.

#2 Silver Maple – 209 Gladman St. #3 Silver Maple – 209 Gladman St.

#4 Silver Maple – 209 Gladman St. #5 Norway Maple –

208 Gladman St. #6 Norway Maple – 208 Gladman St.

#7 Norway Maple – 208 Gladman St. #8 Norway Maple – 209 Baseline Rd. W. #9 & #10 White Birch –

209 Baseline Rd. W.

14



#11 Norway Maple – 209 Baseline Rd. W

#12 Silver Maple – 208 Baseline Rd. W. #13 & #14 White Cedar – 208 Baseline Rd. W.

#15 Norway Maple – 208 Baseline Rd. W.

#16 Norway Spruce –

478 Beachwood Ave.

#17 Norway Maple – 478 Beachwood Ave.


#19 Linden – 476 Beachwood Ave. #20 Linden – 472 Beachwood Ave.

15





#23 White Spruce – 470 Beachwood Ave.

#24 Linden – 466 Beachwood Ave. #25 Norway Maple –

466 Beachwood Ave. #26 Norway Maple – 460 Beachwood Ave.


#28, #29, #30 & #31 Norway Maple – 454 Beachwood Ave.

#32 Weeping False Cypress – 450 Beachwood Ave.

16






#36 Honeylocust – 424 Beachwood Ave.




#40 Sugar Maple – 414 Beachwood Ave.


17



#42 Sugar Maple – 410 Beachwood Ave.


#44 White Birch – 408 Beachwood Ave.


#46 Colorado Blue Spruce – 398 Beachwood Ave.

#47 European Beech – 394 Beachwood Ave.


#49 Linden – 388 Beachwood Ave. #50 Norway Maple – 386 Beachwood Ave.

18




#52 White Birch – 380 Beachwood Ave. #53 Sugar Maple – 380 Beachwood Ave.



#56 White Spruce – 370 Beachwood Ave.




19












20




#70 Linden – 373 Beachwood Ave. #71 Norway Maple – 375 Beachwood Ave.

#72 Hackberry – 383 Beachwood Ave. #73 Norway Maple –

391 Beachwood Ave. #74 White Birch – 391 Beachwood Ave.




21










#85 Crabapple – 423 Beachwood Ave. #86 Norway Maple – 425 Beachwood Ave.

22



#87 Norway Spruce – 425 Beachwood Ave.

#88 Willow – 433 Beachwood Ave. #89 Norway Maple – 433 Beachwood Ave.

#90 Linden – 437 Beachwood Ave. #91 Lilac – 439 Beachwood Ave. #92 Red Oak – 439 Beachwood Ave.




23







#100 Japanese Flowering Cherry – 465 Beachwood Ave.

#101 Silver Maple – 465 Beachwood Ave.


#103 Honeylocust – 471 Beachwood Ave.


24












25







#118, #119, #120 & #121 White Spruce – 505 Beachwood Ave.





26



#126 Norfolk Island Pine – 521 Beachwood Ave.

#127 White Birch – 525 Beachwood Ave.

tree assessment report - london, ontario · report . city of london . 2017 infrastructure ....

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