ARBORIST REPORT. Pertaining to: 50 Ann St. Bolton, Ontario. Prepared for:

Transcription

1 ARBORIST REPORT Pertaining to: 50 Ann St. Bolton, Ontario Prepared for: Brookfield Homes (Ontario) Limited 7303 Warden Ave., Suite 100 Markham, ON L3R 5Y6 Prepared by: Bruce Tree Expert Company Ltd The Queensway, Suite 1329 Toronto, ON M9C 5H5 p BTEC File #: Date: Feb Revised: Apr

2 Page 2 Introduction Bruce Tree Expert Company Ltd. was retained by Brookfield Residential Properties Inc. in April of 2016 to complete an Arborist Report and Tree Protection Plan for 50 Ann St., Bolton. The report was requested relative to the demolition of the existing building and surface parking lot and construction of a residential condominium with underground parking. The purpose of this report is to: Establish species, size and condition of trees located on and to the subject site. Provide a prescription for the protection of trees during the project and identification of required tree removals as a result of the proposed development. Provide a Tree Protection Plan showing the location of tree protection and removal measures based on the current site plans. Method 1. Trees on the subject site were assessed on June by the consulting arborist. 2. Photos were taken at the time and the most representative are attached as Appendix I. 3. Reference was made during the tree assessment to a topographic survey prepared by KRCMAR dated Nov All trees greater than 15cm in diameter at breast height (DBH) located on the subject site and within approximately 6m of property lines were included in the inventory. Trees of all diameters located on the municipal right of way fronting Ann St. were also included. 5. Trunk diameter was measured using a calibrated diameter tape. 6. Trees were assessed in consideration of overall health and structural integrity and assigned a condition rating ranging from good to fair to poor. The assessment may be characterized as an external visual assessment from the ground. 7. Inventoried trees were tagged using metal number-punched tree tags stapled to the trunks at approximately 1.5m from the ground. 8. The tree inventory is attached as Appendix II.

3 Page 3 9. A draft tree location plan was prepared showing the approximate locations of inventoried trees based on the topographic survey described above and provided to the client. 10. A follow-up site visit was conducted on July to field measure the locations of inventoried trees. A second draft tree location plan was prepared showing the field measured locations of inventoried trees to determine conflicts with the proposed design. 11. A Tree Protection Plan was created by adding tree protection and removal comments to site plans prepared by Quadrangle Architects Ltd. (file dated Mar ) and based on an updated topographic survey prepared by KRCMAR Surveyors Ltd. dated Nov , updated Oct The Tree Protection Plan is attached as Appendix III. Site Description At the time of the tree inventory (prior to demolition), the subject site consisted of a onestorey brick building with an asphalt surface parking lot fronting Ann St. Along a portion of the southeast perimeter of the site, bordering 49 Ann St., there is a mature white cedar hedge growing along the crest of a berm between the properties. The crown of this hedge extends over the subject site. The rear of the property consists of an un-mowed turf area that abruptly meets a steep, naturalized slope. The slope is densely treed, with a closed canopy consisting of predominantly medium-aged black locust, as well as a smaller component of Manitoba maple, sugar maple, white and green ash, and Norway maple. The dense, woody understory consists primarily of dogwood and buckthorn. Tree Inventory See Appendix II. Tree Protection Prescription Pre-Construction 1. The client is to submit the following report and Tree Protection Plan to the Town of Caledon for review. 2. The following tree protection and removal measures must be read in conjunction with the Tree Protection Plan, Appendix III. Both documents must be provided to the site supervisor prior to any work commencing on the site. 3. The proposed development involves the construction of a six-storey condominium building with one level of underground parking. The development proposal does not include alteration of the steep portion of the treed slope.

4 Page 4 4. There is an existing storm sewer pipe below the wooded slope. The site plans have been revised to maintain the storm pipe as is. 5. As a result of the proposed work, Trees 101, 102, (inclusive) are proposed for removal due to excavation on the site. 6. It must be noted that dead trees or trees that measure less than 15cm DBH were not included in the tree inventory. Dead trees and smaller diameter trees (under 15cm DBH) may require removal if the proposed work falls inside the drip line of these additional trees. 7. Trees in poor condition have been recommended for removal in the near future due to poor structure or health, unrelated to the current project. Removal of these additional trees is recommended and not required at the time of the proposed development. 8. The mature cedar hedge located on and over the southeast property line, bordering 49 Ann St., is proposed for removal as it conflicts with the proposed site preparation and future development. The hedge conflicts above ground with the proposed design, as many of the branches extend over the existing building, and will interfere with installation of the shoring. Below ground the hedge is in conflict with the construction of the parking garage foundation as the trees are located along a berm, in which the trunks of several trees lean onto the subject site and the roots likely extending down the berm. Trees in which any part of the stem from ground level to the first branch are located on or over the property line are considered boundary trees. As such, under the Forestry Act, it is the responsibility of the client to obtain permission from the co-owner of any boundary or neighbouring trees prior to their removal. 9. As required by the Town, written permission must be provided to the Town for the removal of or boundary trees from the owner or co-owner of these trees. This has been discussed, and Brookfield will provide such agreement to the Town. 10. Trees proposed for removal, and if approved by the Town, must be removed prior to any work on the site. 11. Additional small-diameter trees (under 15cm DBH) and dead trees may require removal to accommodate the proposed work (not surveyed). These additional trees must also be removed prior to work on the site if in conflict with the proposed work. 12. The drip lines of trees on the slope extend over the mowed turf area. If additional clearance is required for access and construction equipment, branches must be pruned according to proper arboricultural methods. Pruning must be carried out prior to work on the site to avoid accidental damage.

5 Page No disturbance is allowed within the Tree Protection Zone (TPZ) of protected trees without permission from the Town. Disturbance includes soil compaction from machinery, pathways, excavation, grade changes, or storage of materials. The minimum TPZ radius is specified as the drip line of trees. 14. Tree protection barriers are required for all trees that are to be preserved on or to the site. The barriers are to be installed at the drip line of trees as per the Town of Caledon Standard 707. However, to allow for an over dig of the proposed building and access, the tree protection barrier is not able to encompass the entire drip line of all trees on the ravine slope. 15. The tree protection barrier is to be installed as shown on the Tree Protection Plan (Appendix III). The barrier is to be 1.2m (4 feet) high and constructed of orange web snow fencing wired to T-bars. There is to be no damage to roots below ground to install the T- bars. If a root is in conflict, the T-bar must be shifted. T-bars must be no greater than 1.8m apart. The tree protection barrier at the rear of the site is to be installed straight across the property boundary as shown. Construction Phase 16. It is the responsibility of the site supervisor to inspect the condition of the tree protection measures outlined on the plan and within this report each morning. If disturbance is observed, it is to be repaired prior to work commencing on site that day. 17. Excavation is proposed inside of the tree canopies of several trees on the slope for the installation of the storm sewer pipe. Care is to be taken during excavation to minimize any tree roots that are exposed or disturbed outside the tree protection fencing for this work. If roots must be removed outside the TPZ, they must be cleanly pruned. Tearing roots hinders wound closure and can increase risk of disease and root rot. Post Construction 18. It is recommended that trees on the slope are to be monitored following construction for any indications of stress following construction. Stress as a result of the construction may not be apparent for some years following the disturbance and may make the tree more susceptible to other stresses (water stress, insects, disease). If the condition of the trees declines, the most appropriate method to address the issue is to be carried out.

6 Page Inventoried trees that are currently in poor condition may be considered for removal by the client, unrelated to the proposed work, and subject to Town of Caledon approval. Tree removals unrelated to the project may be carried out in the near future, following project completion. 20. Replanting on the site may be required by the Town to compensate for the removal of canopy cover. Refer to the landscape plans developed by Terraplan Landscape Architects for details. If there are any questions regarding this report, please do not hesitate to contact me at Sarah Lamon, M.F.C., I.S.A. Certified Arborist ON-1220A

7 Page 7 Appendix I Photographs 102 Photo 1. Municipal trees 101 and Tree 102 in front of subject site. Small private trees in planters, behind Photo 2. Adjacent private trees 103 and 104.

8 Page 8 Photo 3. Cedar hedge (105) on and to property boundary between subject site and 49 Ann St. Photo 4. Stems of cedar hedge at crest of berm.

9 Page 9 Photo 5. Subject site following demo of building, with treed slope behind. Photo 6. Densely treed slope on subject site.

10 Page 10 Photo 7. Edge of treed slope with branches extending onto turf area..

11 Page 11 Appendix II - Tree Inventory, attached.

12 50 Ann St. - Tree Inventory Appendix II Bruce Tree Expert Company Ltd. Inventory date: June Chart Details: Tree #: Inventoried trees were assigned an identification number. Metal number-punched tags were stapled to the trunk of inventoried trees. Species: Includes the botanical name and common name of each tree. DBH: Diameter in cm measured at 1.4 meters from the ground (diameter at breast height). Drip Line (m): Average crown diameter in metres. Condition Rating: Overall condition rating from good to fair to poor based on overall health and structure. Observations: Specific observations from the visual assessment that have informed the condition rating and action. Minimum TPZ: Minimum required tree protection zone in meters. Location: Private; ; or municipal. Action: Protect, injure or remove recommendations based on the site plans, and other actions to be taken. Tree # Species 101 Freeman maple (Acer x freemanii) 102 Japanese silk tree lilac (Syringa reticulata) 103 Austrian pine (Pinus nigra) 104 Austrian pine (Pinus nigra) DBH (cm) Drip Line (m) Condition Rating Observations Location Action 3 1 Poor Basal wound on west side; moderate to extensive twig dieback; extensive spider mite infestation; poor structure; fair to poor health Fair - Poor Good trunk structure; fair to poor crown structure; moderate to extensive twig dieback with vigorous new growth; fair health Poor Limited view from subject site; codominant stems with narrow angled union and included bark; minor trunk bend; extensive Diplodia tip blight; sparse crown (20% live crown) Poor Limited view from subject site; good trunk structure; asymmetrical crown due to tree; extensive Diplodia tip blight; very sparse crown (10-20% live crown); one 5cm diameter branch extending to property line. municipal municipal Remove - due to construction access and poor condition. Remove - due to construction access and poor condition. Tree Inventory Page 1 of 5

13 50 Ann St. - Tree Inventory Appendix II Tree # Species 105 white cedar hedge (Thuja occidentalis) 106 black walnut (Juglans nigra) DBH (cm) x 35 Drip Line (m) Condition Rating Bruce Tree Expert Company Ltd. Observations Location Action 9 Fair - Poor Limited view from subject site; row of multi-stem and single stem trees located on and to property line; 34 stems between 10-40cm DBH, 25 are greater than 15cm DBH; trees are growing at crest of berm; branches extending up to and over existing building; trees have a cohort relationship with each other; trees individually have poor structure and are crowded, but assessed as a unit are in fair condition Fair Fair trunk; dogleg in upper trunk due to competition with cedar hedge; located on slope; good health; fair crown structure. boundary private Remove with co-owner permission - due to excavation for shoring. Remove - due to excavation for shoring. 107 Norway maple (Acer platanoides) 108 Norway maple (Acer platanoides) Fair - Poor 30cm from tree 116; growing at crest of berm; minor lean to north; dogleg in upper trunk; asymmetrical crown; high vitality; rubbing against stump near ground; competing with cedar hedge Good - Fair Minor lean to north; near crest of slope; large diameter branch extending to north; good health. private private Remove - due to excavation for shoring. Remove - due to excavation for shoring. 109 white ash (Fraxinus americana) 110 sugar maple (Acer saccharum) 111 black locust 112 black walnut (Juglans nigra) 113 black locust 114 black locust Fair - Poor Wound on trunk 60cm from ground on south side and basal wound on west 1/3 circumference, 75cm in length with canker; no EAB exit holes; crown asymmetrical; no dieback; good to fair health Fair Trunk wound on west side from ground to 1.5m; torsional seam; fair grown; asymmetrical due to shading; good health. private municipal Fair Limited view; codominant stems at 2.5m with narrow angled union; tear out on main stem 1/3 circumference with conks Good Good trunk structure; fair crown structure; good health Poor 5-10% live crown; multiple trunk wounds on west side of trunk private with decay; poor structure; poor health Fair Good trunk structure; old tear outs; conk on main scaffold limb; fair crown structure; fair health. private. Recommend removal in near future due to condition (unrelated to project). Tree Inventory Page 2 of 5

14 50 Ann St. - Tree Inventory Appendix II Tree # Species 115 sugar maple (Acer saccharum) 116 sugar maple (Acer saccharum) 117 white ash (Fraxinus americana) 118 black locust 119 Manitoba maple (Acer negundo) 120 black locust 121 Manitoba maple (Acer negundo) 122 black locust 123 green ash (Fraxinus pennsylvanica) 124 black locust 125 black locust 126 black locust 127 black locust DBH (cm) Drip Line (m) Condition Rating Bruce Tree Expert Company Ltd. Observations Location Action Fair Poor trunk flare downslope; conflict with standing dead tree private (rubbing); cohort with trees; good health Good Good trunk structure; fair crown structure; good health. private Fair Cavity from base to approx. 1m, hollow with good wound wood; significant lean to east; asymmetrical crown; good health Poor Growing from base of Tree 119; wound on west side from ground to 1m; canker in upper trunk; extensive dead wood. 32, 28 9 Poor Third stem dead; extensive decay at base on east side; codominant stems near ground; larger stem on significant lean to west; high vitality. private 35 2 Poor Limited view; extensive decay at base; 5% live crown. private. Recommend removal in near future due to condition (unrelated to project) Poor Significant lean to north; structural roots exposed; epicormic private shoots at base; poor structure; high vitality. 47, 43 9 Fair Codominant near ground level; wound on east stem at union to 2m; crown somewhat sparse Poor Symptoms of EAB; epicormic shoots on trunk; minimal live crown; old wound south side with good compartmentalization Fair Good trunk structure; fair crown structure; fair health Poor Top dead; epicormic shoots on trunk; old trunk wound on west side 1/3 circumference Poor Trunk wound 1/2 circumference from ground to crown; fair to. Recommend poor crown structure; fair health. boundary removal in near future due to condition (unrelated to project) Fair Fair structure; fair health. private Tree Inventory Page 3 of 5

15 50 Ann St. - Tree Inventory Appendix II Tree # Species 128 green ash (Fraxinus pennsylvanica) 129 black locust 130 black locust 131 Norway maple (Acer platanoides) 132 green ash (Fraxinus pennsylvanica) 133 Manitoba maple (Acer negundo) 134 black locust 135 black locust 136 black locust 137 Manitoba maple (Acer negundo) 138 black locust DBH (cm) Drip Line (m) Condition Rating Bruce Tree Expert Company Ltd. Observations Location Action 24 3 Poor Symptoms of EAB; epicormic shoots on trunk; top dead. private. Recommend removal in near future due to condition (unrelated to project) Poor Old wound on south side with good compartmentalization; extensive trunk wound 1/3 circumference for length of bole. private 15 3 Poor 50% live crown; wound 1/2 circumference. private. Recommend removal in near future due to condition (unrelated to project) Good - Fair Fair trunk structure; good crown structure; good health. private Poor Symptoms of EAB; epicormic shoots on trunk; top dead; woodpecker damage Poor Second codominant stem failed; remaining stem on lean to east; trunk growing into stump; good health. private private Poor Top dead; live crown composed of epicormic shoots Fair Old trunk wound on south side; minor dead wood; fair to poor trunk structure; fair crown structure; cavity at base on south side; poor flare downslope Fair - Poor Extensive conks in old wounds on trunk' fair crown; fair vitality Poor Significant lean to east, somewhat self-correcting; poor trunk structure; fair crown structure; moderate crown dieback at top Fair Some crown dieback at top; small diameter dead wood in lower crown; fair trunk structure; fair crown structure.. Recommend removal in near future due to condition (unrelated to project).. Recommend removal in near future due to condition (unrelated to project). Tree Inventory Page 4 of 5

16 50 Ann St. - Tree Inventory Appendix II Tree # Species 139 black locust 140 black locust DBH (cm) Drip Line (m) Condition Rating Bruce Tree Expert Company Ltd. Observations Location Action Fair - Poor Fair Old trunk wound on south side from base to approx. 3m; fair to poor trunk structure; fair to poor crown structure; fair health Old trunk wound on west side from ground to 1m and on east side from ground to 1.5m ; fair crown structure; fair health. Tree Inventory Page 5 of 5

17 Page 12 Appendix II - Tree Protection Plan, attached.

18 Inventory date: June Chart Details: Tree #: Inventoried trees were assigned an identification number. Metal number-punched tags were stapled to the trunk of inventoried trees. Drip Line (m): Average crown diameter in metres. Condition Rating: Overall condition rating from good to fair to poor based on overall health and structure. Observations: Specific observations from the visual assessment that have informed the condition rating and action. Minimum TPZ: Minimum required tree protection zone in meters. 101 Freeman maple 3 1 Poor municipal Remove - due to construction (Acer x freemanii) access and poor condition. 102 Japanese silk tree lilac Fair - Poor municipal Remove - due to construction (Syringa reticulata) access and poor condition. 103 Austrian pine Poor (Pinus nigra) 104 Austrian pine Poor (Pinus nigra) 105 white cedar hedge Fair - Poor Remove with co-owner (Thuja occidentalis) x 35 boundary permission - due to excavation 106 black walnut Fair private Remove - due to excavation (Juglans nigra) for shoring. Inventory 107 Norway date: June maple Fair - Poor private Remove - due to excavation Chart Details: (Acer platanoides) for shoring. Tree 108 #: Norway Inventoried maple trees were assigned 42 an 12identification Good - Fair number. private Metal number-punched Remove - due tags to excavation were stapled to the trunk (Acer platanoides) of inventoried trees. for shoring. 109 white ash Fair - Poor private Species: Includes the botanical name and common name of each tree. (Fraxinus americana) DBH: 110 Diameter sugar maple in cm measured at meters 11 from the Fairground municipal (diameter at breast height). Drip Line (Acer (m): saccharum) Average crown diameter in metres. 111 black locust Fair Condition Rating: Overall condition rating from good to fair to poor based on overall health and structure. Observations: 112 black walnut Specific observations 45 from 12 the visual Good assessment that have informed the condition rating and action. (Juglans nigra) Minimum 113 black TPZ: locust Minimum required 27.5 tree protection 4 zone Poorin meters. private. Recommend removal Location: (Robinia Private; pseudoacacia) ; or municipal. in near future due to condition 114 black locust 57 9 Fair private (unrelated to project). Action: Protect, injure or remove recommendations based on the site plans, and other actions to be taken. 115 sugar maple Fair private Inventory date: June Tree (Acer saccharum) Species DBH Drip Condition Location Action Chart Details: 116 # sugar maple (cm) 29.5 Line 12 Rating Good private (Acer saccharum) (m) Tree #: Inventoried trees were assigned an identification number. Metal number-punched tags were stapled white Freeman ash maple Poor Fair municipal private Remove - due to construction to the trunk of inventoried trees. (Fraxinus (Acer x freemanii) americana) access and poor condition. Species: Includes the botanical name and common name of each tree black Japanese locust silk tree lilac Fair Poor - Poor municipal Remove - due to construction DBH: Diameter in cm measured at 1.4 meters from the ground (diameter at breast height). (Robinia (Syringa pseudoacacia) reticulata) access and poor condition Manitoba Austrian pine maple 32, Poor Drip Line (m): Average crown diameter in metres. (Acer (Pinus negundo) nigra) Condition Rating: Overall condition rating from good to fair to poor based on overall health and black Austrian locust pine Poor. Recommend removal structure. Observations: Specific observations from the visual assessment that have informed the condition rating (Robinia (Pinus nigra) pseudoacacia) in near future due to condition and action Manitoba white cedar maple hedge Fair Poor - Poor (unrelated Remove with to project). co-owner Minimum TPZ: Minimum required tree protection zone in meters. (Acer (Thuja negundo) occidentalis) x 35 boundary permission - due to excavation black locust walnut 47, Fair Remove - due to excavation Location: Private; ; or municipal. (Robinia (Juglans nigra) pseudoacacia) for shoring. Action: Protect, injure or remove recommendations based on the site green Norway ash maple Fair Poor - Poor Remove - due to excavation plans, and other actions to be taken. (Fraxinus (Acer platanoides) pennsylvanica) for shoring. Tree Species DBH Drip Condition Location Action black Norway locust maple Good Fair - Fair Remove - due to excavation # (cm) Line Rating (Robinia (Acer platanoides) pseudoacacia) for shoring. (m) black white locust ash Fair Poor - Poor (Robinia (Fraxinus pseudoacacia) americana) 101 Freeman maple 3 1 Poor municipal Remove - due to construction black sugar locust maple Poor Fair municipal. Recommend removal (Acer x freemanii) access and poor condition. (Robinia (Acer saccharum) pseudoacacia) boundary in near future due to condition 102 Japanese silk tree lilac Fair - Poor municipal Remove - due to construction black locust Fair (unrelated to project). (Syringa reticulata) access and poor condition. 103 Austrian pine Poor green black walnut ash Good Poor. Recommend removal (Pinus nigra) (Fraxinus (Juglans nigra) pennsylvanica) in near future due to condition 104 Austrian pine Poor black locust Poor private (unrelated. Recommend to project). removal (Pinus nigra) in near future due to condition 105 white cedar hedge Fair - Poor Remove with co-owner black locust Poor Fair private. (unrelated Recommend to project). removal (Thuja occidentalis) x 35 boundary permission - due to excavation in near future due to condition 106 black walnut Fair private Remove - due to excavation Norway sugar maple maple Good Fair - Fair private (unrelated to project). (Juglans nigra) for shoring. (Acer platanoides) saccharum) 107 Norway maple Fair - Poor private Remove - due to excavation green sugar maple ash Good Poor private. Recommend removal (Acer platanoides) for shoring. (Fraxinus (Acer saccharum) pennsylvanica) in near future due to condition 108 Norway maple Good - Fair private Remove - due to excavation Manitoba white ash maple Poor Fair private. (unrelated Recommend to project). removal (Acer platanoides) for shoring. (Acer (Fraxinus negundo) americana) in near future due to condition 109 white ash Fair - Poor private black locust Poor (unrelated to project). (Fraxinus americana) 110 sugar maple Fair municipal black Manitoba locust maple 32, Poor Fair (Acer saccharum) (Robinia (Acer negundo) pseudoacacia) 111 black locust Fair black locust Fair Poor - Poor. Recommend removal in near future due to condition 112 black walnut Good Manitoba maple Poor (unrelated to project). (Juglans nigra) (Acer negundo) 113 black locust Poor private. Recommend removal 138 in near future due to condition 122 black locust 47, Fair 114 black locust 57 9 Fair private (unrelated to project) black green locust ash Fair Poor - Poor (Robinia (Fraxinus pseudoacacia) pennsylvanica) 115 sugar maple Fair private black locust Fair (Acer saccharum) 116 sugar maple Good private 125 black locust Poor (Acer saccharum) 117 white ash Fair private 126 black locust Poor. Recommend removal (Fraxinus americana) Species: Includes the botanical name and common name of each tree. DBH: Diameter in cm measured at 1.4 meters from the ground (diameter at breast height). Location: Private; ; or municipal. Action: Protect, injure or remove recommendations based on the site plans, and other actions to be taken. Tree # Species DBH (cm) Drip Line (m) Condition Rating Location Action