Arboriculture Assessment - GreensceneNZ · G14807 – Arboriculture Assessment Apr18 GREENSCENENZ LIMITED PO Box 56 551, Dominion Road, Auckland P 09 623 3514 F 09 623 3515 E [email protected]

Beca // 2 May 2018

4216571 // NZ1-15242655-52 0.52 // page 137

Appendix H

Arboriculture Assessment - GreensceneNZ

Arboriculture Assessment

St Marys Bay and Masefield Beach Water Quality Improvement Project

Report compiled by: Godfrey Fitzpatrick

Report reviewed by: Allan Holmes

Date: 18 April 2018


G14807 – Arboriculture Assessment Apr18 GREENSCENENZ LIMITED

PO Box 56 551, Dominion Road, Auckland P 09 623 3514 F 09 623 3515 E [email protected]

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EXECUTIVE SUMMARY The St Marys Bay and Masefield Beach Water Quality Improvement Project (“the Project”) is an Auckland Council project being undertaken to reduce combined sewer overflows to the beaches of St Marys Bay and Masefield Beach. The Project involves the installation of a new storage pipeline that will run from New Street/London Street through to a new site within Pt Erin Park.

The new pipeline will have the capacity to store much of the combined sewer overflow volume, so that when there is capacity in the sewer network, the captured overflows can be pumped back to the sewer network for treatment at the Mangere Treatment Plant. During heavy rainfall events when the capacity of the storage pipeline and sewer network is exceeded, overflows will be discharged via a new marine outfall further out into the Waitematā (approximately 450m long), at a location that will enable better dispersion and dilution. The existing failed outfall at Masefield Beach will be removed, and there will no longer be any direct discharges onto Masefield Beach. Overall the project will results in significant improvement in terms of discharges to these local environments from approximately 206 per year to approximately 20 per year.

The new storage pipeline is proposed to be installed via tunnelling, with the main construction site being located within Pt Erin Park. Some open trenching will also be required to install connecting pipes along Curran Street and Sarsfield Street, and further trenching and pipe jacking will be used to install the new marine pipeline from Pt Erin Park across Curran Street and out into the Waitemata Harbour. Construction is anticipated to take approximately 24 months to complete.

GreensceneNZ Ltd has been commissioned by Auckland Council Healthy Waters Department to provide an arboricultural assessment in respect of the proposed Project, as part of the technical work necessary to support resource Consent Application for construction of the new infrastructure.

As indicated, the Project entails a pipeline primarily by means of trenchless technology connecting London Street and St Marys Road Park through to the North of Point Erin Park where a weir structure is proposed.

Ancillary connections by means of open trench excavation will be required within the protected root zones of vegetation and, in particular:

(i) A connection within St Marys Road Park; and (ii) A gravity wastewater rising main, wastewater rising main and associated

monitoring network, which return to the proposed weir structure along Sarsfield and Curran Streets.




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The alignment and construction methodology of these elements has been modified to minimise potential adverse effects on adjacent vegetation.

Two marine outfall options have been proposed. From an arboricultural perspective, there is a preference for the southern alignment (option 1); it being noted that it involves additional manholes.

The Project will require crown lift pruning of a number of protected street trees to enable the safe operation and movement of machinery and implementation of a Traffic Management Plan on St Marys Bay Road, Sarsfield and Curran Streets. For similar reasons, lift pruning of three trees and removal of one weed species within St Marys Road Park is also required. The additional translocation of three juvenile pohutukawa within St Marys Road Park to facilitate works is the subject of a separate enabling consent application.

Appendices A and B contain a schedule of trees and tree location plans of trees within proximity of the proposed Project subject to E26 of the Auckland Unitary Plan – Operative in Part (“AUP-OP”). The protected root zones of those trees are identified by a green circle. For the purposes of this assessment, the Project will take place within areas zoned Road, Open Space, and Significant Ecological Areas - Terrestrial. Of note, several areas within the proposed footprint are subject to a Strategic Traffic Corridor designation.

GreensceneNZ understands that there will be minimal saline intrusion of groundwater during dewatering associated with shaft construction and excavation at Pt Erin. This will be limited to a maximum of 30m landward from the seawall and has the potential to affect a limited number of trees subject to the outfall option. At this time, it is understood that such water will be discharged into existing stormwater.

It is considered that the following activities are permitted activities:

• Excavation associated with the shafts and tunnelling; • Removal of roots <80mm within zones in which planning rules affecting ‘Trees

in Roads and Open Space’ apply, provided such alteration is otherwise in compliance with Standards E26.4.5.2(2), AUP-OP;

• Crown lift pruning of street trees above the road carriage way to a height of 4.5m to facilitate vehicle movement; and

• Crown lift pruning of Tree 54 above the east bound berm on Sarsfield Street.

The following activities are considered restricted discretionary:




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• Removal of one stem from a Cordyline australis, or ti kouka, in proximity of Tree 30, within St Marys Road Park;

• Removal of a Ligustrum sinense, or privet, in proximity of Tree 30, within St Marys Road Park;

• Crown lift pruning of Trees 36 and 53 on Sarsfield Street to ≥ 6.5m to facilitate excavation;

• Crown reduction of Tree 53 to balance the tree following lift pruning; and • Alteration of any roots >80mm within areas to which the planning rules Trees in

Roads and Open Space apply, particularly in proximity of Trees 26, 30, 36, 53 and 54;

Finally, the following activities have been assessed as discretionary:

• Alteration of any roots encountered during excavations in proximity of Tree 111, due to the location of the tree within the neighbouring SEA.

It is to be observed that several trees on Sarsfield Street have been removed since the area was initially surveyed, as a result of Dutch Elm Disease (“DED”). It is possible that further trees within the proposed scope of works may similarly require removal, including Tree 53 which has symptoms consistent with DED, but in respect of which testing has proved negative. The implementation of hygiene control measures to limit the spread of the pathogen will be necessary in respect of the movement of organic matter. As the Project progresses, consideration will also need to be given to the possibility that additional control measures may be required in respect of vegetation affected by myrtle rust. On the basis that the works are undertaken in accordance with the plans provided to GreensceneNZ and in adherence with the discussion and Tree Protection Methodology contained at Sections 6 and 7 of this report, it is considered that any adverse effects on vegetation may be minimized. Mitigation and recommended conditions of consent are provided at Sections 8 and 10 of this report. Auckland Council Asset Owner Approval has been obtained from Arboricultural and Eco Specialist, Mr Simon Cook. Mr Cook’s comments are contained at Appendix C.




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TABLE OF CONTENTS

EXECUTIVE SUMMARY .............................................................................................. 2

TABLE OF CONTENTS ................................................................................................ 5

1.0 INTRODUCTION ................................................................................................ 6

2.0 COLLECTION AND ASSESSMENT METHODOLOGY ...................................... 7

3.0 SITE DESCRIPTION .......................................................................................... 8

4.0 PROPOSED WORKS ......................................................................................... 9

5.0 ARBORICULTURE PLANNING ASSESSMENT ............................................... 18

6.0 ARBORICULTURE ASSESSMENT AND DISCUSSION .................................. 20

7.0 TREE PROTECTION METHODOLOGY ........................................................... 35

8.0 MITIGATION .................................................................................................... 39

9.0 RECOMMENDATIONS ....................................... Error! Bookmark not defined. 10.0 CONCLUSION ................................................................................................. 39

11.0 RECOMMENDED CONDITIONS OF CONSENT ............................................. 39

APPENDIX A – PROTECTED TREE DETAILS ........................................................... 41

APPENDIX B – Tree Location ..................................................................................... 60

APPENDIX C- AOA .................................................................................................... 61




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1.0 INTRODUCTION 1.1 GreensceneNZ Ltd has been commissioned by Auckland Council Healthy

Waters Department to provide an arboricultural assessment in respect of the Project. Figure 1 provides an overview of the affected area.

1.2 This report has been compiled with reference to the following plans to assist in the preparation of the assessment:

• Aurecon, New Street Receiving Shaft, Construction Layout, 255303-0000-DRG-CC-1027-F, dated 20 March 2018.

• Aurecon, St Marys Road Shaft Construction Layout (with hand annotations) 255303-0000-DRG-CC-1208-A, undated.

• Aurecon, Sarsfield Street Connection Pipeline Plan and Long Section Sheet 3 of 4, 255303-0000DRG-CC-1063-E, dated 20 March 2018.

• Alta Consulting, Curran St Rising Main, Curran St, Pt Erin Temp Road Realignment, DWG PXJ-1068, Sheets 1-5, dated 17 September 2017

• Aurecon, Point Erin Park Pump Station Option A Construction Layout, 255303-0000-DRG-CC-1121-A, dated 29 June 2017.

• Aurecon, Storage Pipeline Plan and Long Section Sheets 1-4, dated 20 March 2018.

1.3 Site assessments were undertaken over a series of dates in March, October and December 2017. Consultation with Auckland Council’s Parks Arboricultural and Eco Specialist Mr Simon Cook, has been undertaken in the compilation of this report. Written approval from Mr Cook as the delegated asset owner is provided in Appendix C of this report.




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Figure 1: Aerial view of the St Marys Bay and Masefield Beach area, with areas identified as SEA-T(green), Designations (red) and Mana Whenua: Sites and Places of Significance (purple) identified; obtained from Auckland Council GIS.

2.0 COLLECTION AND ASSESSMENT METHODOLOGY

2.1 A site survey was undertaken over the course of several days in March, October and December 2017. Collection

2.2 Surveying was undertaken from public vantage points using the following equipment:

• Nikon Forestry Pro clinometer • Yamayo Diameter Tape • Komelon measurement wheel




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2.3 The location of trees was recorded using a Garmin GPS 64S, paired to a mobile device operating on Esri Collector for ArcGIS software. Limitations

2.4 There are limitations with the data collected. The position of trees is affected by the accuracy of GPS. For this reason, the location of trees must be treated as approximate. Further, as indicated, the collection and assessment of trees was made from public vantage points. As such, data in respect of trees within private properties must be treated as approximate. Collection Fields

2.5 The following data fields were collected in accordance with Australian Standard AS4970 -2009 concerning the protection of trees on development sites:

• Height • Crown radius • Diameter at Breast Height (approx 1.4m) • Basal diameter

2.6 Where trees have been heavily crown lift pruned or a multiple stem

measurement was deemed inappropriate due to irregular growth, the diameter at breast height was substituted for a basal measurement in accordance with the English arboricultural National Joint Utilities Group recommendations. Following this method, the basal diameter taken above stem flare is multiplied by 10 to establish a tree protection zone.

2.7 Subject to accessibility, a Visual Tree Assessment (“VTA”) was undertaken of trees. VTA involves the methodical assessment of any visible defects within the root zone, stem and crown in order to determine failure potential. It also takes into consideration past failures and any site conditions which may contribute to increased risk of failure.

3.0 SITE DESCRIPTION

3.1 The proposed works will occur within the context of a mix of urban (street), park and coastal environments. The works broadly follow the escarpment from the intersection of New and London Streets, St Marys Road Park through to an area of bare land adjoining an SEA-T to the North of Point Erin Park. An ancillary service alignment continues along the escarpment toe to the West of Point Erin Park connecting with existing service lines on Sarsfield Street.

3.2 In the main, vegetation in the area is a characterised by a mixture of mature exotic and native trees, of which mature pohutukawa form a significant visual component of the North facing escarpment.




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4.0 PROPOSED WORKS 4.1 As indicated, the proposal broadly entails a pipeline primarily by means of

trenchless technology connecting London Street, St Marys Road Park, through to land zoned as Strategic Transport Corridor to the North of Pt Erin Park, where a weir structure and two marine outfall options have been proposed.

4.2 In addition to crown proximity lift pruning, the Project will require open excavation within the protected root zones of trees at St Marys Road Park to replace a manhole cover associated with an EOP connection. Open excavation along Sarsfield and Curran Streets is also required to install a gravity wastewater rising main, wastewater rising main and associated monitoring network, which return to the proposed pump station.

4.3 Specifically, with the potential to affect protected trees, an arboricultural planning assessment of the proposed works has been undertaken using the following headings:

• Shafts and Trenchless Excavation (Tunnelling) • Adjacent Land Use (St Marys Road Park and Pt Erin) • Trees in Roads (Pruning) • Open Space (Pruning and Removals) • Trees in Roads (Open Excavation) • SEA Vegetation (Open Excavation) • Open Space (Open Excavation)

Shafts and Trenchless Excavation (Tunnelling)

4.4 Ranging in depth ~20m and approximately 12m in diameter, three shafts will be constructed at; the intersection of New and London Streets, St Marys Road Park and to the North of Point Erin Park, from which a tunnel will be launched, spoil removed and tunnel sleeved. The minimum depth of the tunnel below ground level will be approximately 3m.

4.5 Although the shafts will be outside the root zone of protected trees and tunnelling will be at a depth unlikely to directly affect trees due to the underlying geology, it is understood that there may be some saline intrusion into ground water during dewatering.




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Adjacent Land Use

4.6 The Project will require areas set aside for site offices, set-down, storage, loading-out and for the operation and manoeuvre of oversize vehicles involved in the removal and stock piling of spoil, movement and delivery of machinery and construction materials, including pipes.

4.7 It is intended to utilise a large bare flat area to the North of Pt Erin Park for the majority of works. This area adjoins land zoned as SEA. The entrance of this site, off Curran Street, will cross the technical protected root zone of a pohutukawa within the SEA, but due to the existence of a previously formed road and location of the tree on an escarpment, no adverse effects are anticipated. Temporary tree protection fencing will be installed near vulnerable areas bordering the SEA.

4.8 Similar land use will occur at St Marys Road Park where works will be confined to the eastern side of the Park in order for the park to remain open for park users. Fencing will be similarly placed around the protected root zone of trees and measures instituted to prevent soil compaction. This will be achieved by means of geotextile and a 200mm layer of base course.

4.9 This aspect of works will also require the translocation of three juvenile pohutukawa (Trees 24, 25 and 28) within the park to provide sufficient space to manoeuvre associated vehicles and machinery. The translocation is the subject of a separate enabling consent application. Trees in Roads (Pruning)

4.10 Crown lift pruning to 4.5m above the road carriage way will be required on St Marys Bay Road to ensure that trees are not inadvertently damaged during the movement of oversize vehicles. Presently, several trees are as low as 2.3m above the road carriage way (refer photo 1).




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Photograph 1: St Marys Road looking South.

4.11 Similar pruning will be required to a height of 4.5m in respect of street trees

above the West bound lane of Sarsfield Street between Shelly Beach Road and Curran Street due to the proposed closure of the East bound lane while excavation occurs.

4.12 It is anticipated that the depth of excavation on Sarsfield Street will require a 20-

30T excavator to be operated. To accommodate the operating clearance of 6.5m, several limbs approximately ≤ 150mm in diameter at point of severance will need to be removed from Trees 36 and 53 from above the road carriage way.

4.13 It is important to note that this report is prepared on the basis that Trees 36 and 53 remain unaffected by DED.

4.14 A similar level of clearance will be required above the east bound berm between Trees 53 and 54. A change in alignment between these trees is favoured at this point for reasons of engineering and traffic management.




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4.15 Three branches measuring approximately 40mm, 80mm, and 100mm in diameter at point of severance will need to be removed from Tree 53 to facilitate the change in alignment at this point. Additional pruning of Tree 53 by means of crown reduction may be required to balance the remainder of the tree.

4.16 Two branches measuring approximately 40mm and 60mm in diameter at point of severance will need to be removed from Tree 54. Open Space Trees (Pruning and Removal)

4.17 A service connection will need to be made with the existing EOP located within the protected root zones of Trees 26 and 30, adjacent to the escarpment within St Marys Road Park. Tree 26 has been the subject of previous unauthorised pruning which has removed approximately 50% of its live crown. To reduce further disturbance, it is proposed to replace the manhole cover and make the connection outside the protected root zone of Trees 26 and 30.

4.18 Replacement of the manhole cover will involve the operation of a 12T excavator and require an operating clearance of 6m in height and 3-4m in width. In order to limit the extent of further crown loss from Tree 26, it is proposed to approach the manhole on the diagonal between Trees 26 and 30, using track matting. This will require the removal of:

• Lateral deadwood (Tree 26); • One 80mm (approximate) and two 50mm (approximate) laterals in

diameter at point of severance (Tree 26 – refer photo 2); • Five laterals approximately 30mm, 2 x 40mm, 60 mm and 80mm in

diameter at point of severance (Tree 30 refer photo 2). • One stem from a ti kouka approximately 120mm in diameter at point of

severance (refer photo 3); and • One privet over 4m in height (refer photo 4).

4.19 It is considered additional clearance can be obtained by propping and/or tying

back branches.




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Photograph 2: Indicative tracking line (dotted line) and areas of pruning (Tree 26 left arrow, Tree 30 right).




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Photograph 3: Ti kouka stem proposed to be removed (white arrow).




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Photograph 4: Ligustrum sinense proposed to be removed.

4.20 This aspect of works will also require the translocation of one juvenile

pohutukawa (Tree 28) within the Reserve to facilitate works, but which is the subject of a separate enabling consent application.

Trees in Roads (Open Excavation)

4.21 As indicated, a gravity wastewater rising main, wastewater rising main and associated monitoring network is proposed on Sarsfield and Curran Streets, which will return to the weir structure to the North of Pt Erin Park. The works




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will be completed by excavator toward the centre line within the east bound lane of Sarsfield Street and the edge of the South bound lane of Curran Street.

4.22 For the most part, the width of the excavation will be approximately 1.5m and, subject to topography, the excavation may extend to depths of 5-6m. The trench will contain two pipes and a monitoring network to reduce the overall footprint. Plans supplied to GreensceneNZ separate these alignments, providing a misleading impression (exaggeration) of additional excavation (refer Map 5, Appendix A).

4.23 Some root loss is anticipated due to the nature and depth of the excavation which will need to be shored. The potential for root loss and effects will be heightened in the vicinity of 26 and 28 Sarsfield Street where:

• The width of the excavation is increased to 3m to connect with existing manhole in the centre of the carriage way; and

• The alignment passes between Trees 53 and 54 and connection is made with the monitoring and power supply, albeit the latter will be kept outside the protected root zone of the subject trees.

SEA Vegetation (Excavation)

4.24 Where the gravity wastewater rising main and wastewater rising main leaves Curran Road for the proposed weir structure, it will pass beneath an overhanging pohutukawa located within SEA (refer photo 5). For reasons outlined at Section 6 of this report, it is unlikely that many, if any, roots will be encountered.




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Photograph 5: Tree 111, located on the escarpment (right horizontal arrow) within an SEA, with the entrance and approximate proposed alignment indicated (left vertical arrow).

Open Space (Excavation)

4.25 As indicated previously, a connection will need to be made with the existing Hackett Street EOP manhole located within the protected root zones of Trees 26 and 30, adjacent to the escarpment within St Marys Road Park (refer photo 6). To limit disturbance of Tree 26, the manhole cover will be replaced and final connection made outside the protected root zone of these trees.

4.26 The depth of excavation required to replace the manhole cover is assumed to be in the vicinity of 3m with a corresponding surface area of 3m x 2m. Due to the volume and depth of excavation, a 12T excavator operating from track matting will be required. Soil will be removed by an in situ or mobile conveyer.

4.27 Branch wrapping measures will also be implemented to minimise any inadvertent damage to low horizontal limbs.




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Photograph 6: Tree 26 (right), approximate location of the manhole indicated.

5.0 ARBORICULTURE PLANNING ASSESSMENT

5.1 The trees and vegetation affected by the proposed works are subject to Rule(s) of the AUP-OP.

Zoning:

Road Reserve Strategic Transport Corridor Open Space – Informal Recreation

Overlays SEA-T 6025, 6022A

Designations

6718, 6721 State Highway 1: To undertake maintenance, operation, use and improvement to the State Highway network 514 Local Park, Auckland Council




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5.2 Due to the location of the proposed weir structure and shafts and nature of the

underlying geology and depth of the tunnel (≥3m), alteration of the protected root zone is not envisaged and, as such, is unlikely to raise any tree related issues in terms of the AUP-OP. Any salt water intrusion will be primarily addressed through discharging such water into existing stormwater and will be subject to ongoing monitoring of water quality.

5.3 There is potential to encounter roots >80mm during excavation of the proposed gravity wastewater rising main and, in particular, in proximity of Trees 53 and 54 on Sarsfield St and during replacement of the manhole cover within St Marys Bay Park in proximity of Trees 26 and 30. As such, this aspect of the proposed works may contravene Standard E26.4.5.2(2)(a)(ii) and, as such, would be a restricted discretionary activity pursuant to E26.4.3.1(A88).

5.4 In the unlikely event that roots originating from Tree 111 are encountered during excavation of the proposed gravity wastewater rising main as it returns to the weir structure, any alteration would not meet Standards E26.3.5.1 - E26.3.5.4 and would be a discretionary activity pursuant to E26.3.3.1(A78).

5.5 As the Standards contained in E26.4.5.1(1) of the AUP-OP do not apply in respect of crown lift pruning of trees ≤ 4.5m above the road carriage way, pruning above the West bound lane on Sarsfield Street and St Marys Bay Road is a permitted activity pursuant to E26.4.3.1(A83). For this reason, further assessment of the effects in respect of this aspect is unnecessary.

5.6 Due to the diameter of the cuts at point of severance, the pruning of Trees 36 and 53 above the east bound lane of Sarsfield Street to satisfy height requirements associated with operation of the excavator will not meet the

Rules

In relation to Trees in Roads and Open Space, E26.4.3.1(A84) provides that tree trimming or alteration of trees in roads and open space zones that do not comply with Standard E26.4.5.1 is a restricted discretionary activity. In relation to trees in roads and open spaces, E26.4.3.1(A88) and (A92) provide that works within the protected root zone of trees that do not comply with Standard E26.4.5.2 or involves the alteration or removal of trees ≥ 4m in height and/or ≥ 400mm in girth will be a restricted discretionary activity. In relation to vegetation within SEA, E26.3.3.1 (A78) provides that vegetation alteration or removal not otherwise provided for is a discretionary activity.




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Standards contained in E26.4.5.1(1). Accordingly, such pruning would be a restricted discretionary activity pursuant to E26.4.3.1(A84).

5.7 It is considered that pruning of Tree 54 above the east bound berm of Sarsfield Street to meet the height requirements associated with the operation of the excavator will meet the Standards contained in E26.4.5.1(1). As such, the pruning is a permitted activity.

5.8 However, due to the diameter of the cuts at point of severance associated with Tree 53 above the east bound berm of Sarsfield Street to meet the height requirements associated with the operation of the excavator and likelihood that a full crown reduction may be required to balance the tree, such pruning would be a restricted discretionary activity pursuant to E26.4.3.1(A84).

5.9 The pruning of Trees 26 and 30 to satisfy the height requirements associated with operation of the excavator to complete replacement of the manhole within St Marys Road Park would not meet the Standards contained in E26.4.5.1(1)(c). Accordingly, such pruning would be a restricted discretionary activity pursuant to E26.4.3.1(A84).

6.0 ARBORICULTURE ASSESSMENT AND DISCUSSION

6.1 A site survey was undertaken over the course of March, October and December 2017. Details of the assessment are contained in the attached tree schedule and location plans at appendices A and B.

6.2 With the potential to affect protected trees, the proposed works will be assessed using the following headings:

• Shafts and Trenchless Excavation • Adjacent Land Use (St Marys Road Park and Pt Erin Park) • Open Excavation • Dutch Elm Disease • Pruning and Removals • Neighbouring Trees

Shafts and Tunnelling

6.3 GreensceneNZ understands that there may be saline intrusion into groundwater during tunnelling and dewatering near the outlet at Pt Erin. This will be limited to a maximum of ~30m landward from the seawall and tapering from the point of excavation.

6.4 Subject to the outfall option, saline intrusion has the potential to affect four trees within land subject to designation at Pt Erin, namely Tree 107 (Metrosideros




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excelsa), Tree 108 (Araucaria heteophylla), Trees 109 and 110 (M. excelsa) (refer Figure 2).

Figure 2: Trees identified within the area which may be affected by saline intrusion, Option 1 (broken yellow line) and Option 2 (solid yellow line) identified. Note the unidentified tree no longer exists.

6.5 Plants absorb water through roots using three pathways, namely, apoplastic

(between cells), symplastic (via plasmodesmata) and transcellular, and include the use of specialised proteins such as aquaporins. Plants actively manage an ion gradient within roots relative to the external ion concentration to ensure that water and nutrients are absorbed. As soils become increasingly saline and the external gradient increases relative to the internal concentration, plants are unable to draw as much water.

6.6 Certain soils, particularly those which have a large surface area, such as clays and silts tend to promote the retention and upward movement of saline solutions through capillary cohesion and adhesion.

6.7 Subject to Electrical Conductivity and soil chemistry, salinity may be treated through the application and flushing of calcium sulphate di-hydrate and/or other chemical ‘breakers’.

6.8 The tolerance of trees to saline conditions is species and site specific. Many of the species in proximity of the proposed works are coastal species and will have been exposed to salinity by virtue of their location. In these areas, vegetation is




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limited and will have a degree of pre-existing tolerance. It is understood that water captured during dewatering of these areas will be discharged back into stormwater and site conditions will be monitored allowing for measures to be instituted, should adverse effects become evident.

6.9 Notwithstanding the preceding paragraph, there will be a preference for Option 1 due to the increased separation from the point of intrusion; it being noted that Trees 109 and 110 are approximately 30m from the seawall. Adjacent Land Use

6.10 As noted previously, the Project will require use of land adjacent to an area zoned SEA-T North of Pt Erin Park and to the East of St Marys Road Park.

6.11 Temporary fencing will be installed to protect vulnerable vegetation at both sites. In addition, a layer of geotextile and 200mm of base course applied within St Marys Road Park to reduce potential compaction.

6.12 On the basis that works will be isolated from surrounding vegetation and Tree Protection Measures adhered to, any adverse effects are considered less than minor. General: Open Excavation

6.13 The primary constraint with the potential to adversely affect trees concerns potential root loss associated with open excavation earthworks. Due to the depth of excavation at each site, shoring will be required which will necessitate the removal of all roots along the excavation face.

6.14 All root loss has the potential to cause decay, dieback and will result in vascular dysfunction (absorption and conduction) and disruption of growth regulating pathways - the risk of which increases proportionately with age and the diameter at the point of severance.

6.15 Increased retention of the root zone is always preferable, particularly where trees are assessed as mature and / or opportunities for renewed root exploration or foraging strategies are constrained, such road environments where the significance of root loss is considered heightened.

6.16 Tolerance to root loss has typically focused on the retention of coarse structural roots. However, fine roots typically contribute to 95% of total root length and area and are considered to facilitate significant storage of starch. As trees mature, crown development tends to become nominal or incremental, corresponding with which, there is a reduction in the root to crown mass ratio. The reduction of root mass is considered to contribute to vulnerability of trees to root loss.




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Tree Protection and Protected Root Zones

6.17 The data collected has been represented in a series of maps recording the protected root zone and structural root zones – as appropriate (refer Appendices A and B).

6.18 Identification of the structural root zone provides an indicative area within which most structural roots responsible for anchorage and stability are likely to be encountered, with the protected root zone providing a broader indication of the rooting zone required for sustained absorption, conduction and growth regulating processes.

6.19 Inclusion of the structural root zone in accordance with AS4970-2009 is most effective in unrestricted rooting environments. It is only required where there is likely to be an encroachment of more than 10 per cent of the protected root zone or activities are to occur within the structural root zone; at which point consideration of continued viability must be determined. The structural root zone radius is determined by multiplication of the stem diameter above the basal stem flare by a factor of 500.42 x 0.64.

6.20 It must be observed that the technical protected root zone is a nominal calculation and that roots of many species may extend 2-3 times canopy spread in unrestricted growing environments. Much of that root mass (90 percent) occurs within 1m of the surface with most fine roots located within the first 150 -200mm.

6.21 Rooting architecture including the location, density and structural properties of roots is, however, a function of the interaction between ontogenetic potential and:

• Site conditions, including load stress associated with wind and gravity; • Facilitative stimuli, such as obstructions; • Depth, structure, texture and penetration resistance of the growing

media; • Oxygen diffusion; and • Nutrient availability and soil water potentials.

6.22 In anthropomorphic soil structures and restricted rooting environments,

including the present case, the rooting zone(s) may be much larger, smaller, or asymmetric and will reflect the loading requirements of the tree and the location of resources. For this reason, the technical rooting zones are not an absolute quantum and visual assessment is required during excavation.




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Open Excavation: St Marys Road Park

6.23 As indicated at Section 4, open excavation will be required within the technical protected root zones of Trees 26 and 30 to complete the replacement of the Hackett Street EOP manhole cover.

6.24 Trees 26 and 30 are mature escarpment pohutukawa approximately 10m in height with radii and corresponding protected root zones of 17m and 15.6m respectively. Tree 26 has been the subject of unauthorised ‘topping’ which has seen the removal of approximately 50% of its live canopy (refer photo 7). The level of epicormic growth indicates that the tree has sufficient vitality. However, as root decline is associated with canopy loss, any works must be sensitive to all root loss.

Photograph 7: Tree 26, unauthorised 'topping evident'.

6.25 While the trees are in close proximity to the works, it is considered that there will

be reduced rooting activity encountered due to the following facilitative factors:

• Age of the manhole relative to the age and architectural development of the root zone;




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• Location of the trees above the manhole, on the escarpment;

• High water table in proximity of the manhole and tendency for water to

collect in this area at the escarpment toe during periods of inundation; and

• Rooting characteristics of pohutukawa which prefer a free draining environment.

6.26 The following site specific Tree Protection Methodology will apply in respect of

this aspect of works:

• Works will be directly supervised by an experienced and qualified appointed arborist;

• Prior to undertaking mechanical excavation, vulnerable branches will be wrapped to minimise potential damage;

• Excavation will initially proceed by means of hand digging to identify any large structural roots with allowance for some movement of shoring where practicable;

• Where the appointed arborist is satisfied that works may proceed by excavator, the latter will be operated on track matting using a straight blade bucket; and

• All roots encountered will be cleanly severed and moss, hessian and polythene secured to the root and excavation face respectively to prevent desiccation.

Open Excavation: Sarsfield and Curran Streets

6.27 The gravity wastewater rising main, wastewater rising main and associated monitoring network proposed on Sarsfield and Curran Streets will be completed by trench approximately 1.5m in width and ranging up to approximately 6m in depth.

6.28 On Sarsfield Street, the works will be offset from the centre line within the east bound lane.

6.29 On Curran Street the excavation will be near the kerb of the south bound lane approximately 1.5m from the escarpment toe. The vegetation in this area is predominantly Metrosideros sp. and Pinus spp.




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6.30 While some root loss is anticipated due to the nature of the excavation which will need to be shored, it is considered that the following facilitative factors will be relevant, permitting a greater degree of works within the technical protected root zone of the carriageway:

• Sub-base compaction associated with formation of the kerbing and carriageway;

• Existing kerbing structures which encourage increased lateral alignment with the axis of aforementioned structures (Sarsfield Street);

• Renewal of kerbing and storm water structures which may have resulted in prior root loss (Sarsfield Street); and

• On Curran Street, the location and position of the trees on the escarpment above the proposed excavation (refer photo 8).

Photograph 8: Curran Street, looking South with the alignment to the right of the kerb

line, at the escarpment toe.

6.31 However, it is acknowledged that there will be instances, where rooting activity

will exist or can be reasonably be anticipated within the carriage way. In particular, in the vicinity of Trees 53 and 54 where the width of excavation is increased to 3m to complete the connection with existing services. At this point, the alignment also passes between the latter trees within the berm resulting in a




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cut face on two sides of Tree 53, where it will be approximately 4.75m from the root flare of either tree.

6.32 Tree 53 is a mature former pollard, since released. At the time of assessment, fruiting bodies were observed in proximity of a column cavity. Such decay and similar decay at points of release are not uncommon with pollards. More recently, ‘flagging’, a symptom of DED was observed. Other trees within proximity have previously tested positive and since been removed. Samples have been taken from Tree 53 for analysis by Auckland Council. While it is understood that the samples returned negative, this may be associated with sampling error and the tree should be treated as positive in terms of hygiene measures.

6.33 While both elm and willow myrtle are tolerant of root pruning and the proposed excavation will be outside the Structural Root Zone of both trees, the level of disturbance in respect of Tree 53, including lift pruning, is such that it is recommended that the area around both trees is mulched and a root bio stimulant applied as soon as possible to encourage increased root development during summer when starch is stored and root growth is active.

6.34 The following site specific Tree Protection Methodology will apply in respect of this aspect of works:

• Works will be directly supervised by an experienced and qualified appointed arborist;

• Wrapping of vulnerable branches to be retrained will take place prior to the commencement of works.

• Works will be completed by an excavator fitted with a straight blade bucket until such a point as the appointed arborist determines further root activity is unlikely; and

• All roots encountered will be cleanly severed and moss, hessian and polythene secured to the root and excavation face respectively to prevent desiccation.

Open Excavation: SEA Vegetation

6.35 Where the gravity wastewater rising main and wastewater rising main leaves Curran Road for the proposed weir structure, it will pass beneath an overhanging pohutukawa located within SEA (refer photo 5).




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6.36 For reasons outlined at Section 6.29 of this report, it is unlikely that many, if any, roots will be encountered. Notwithstanding this, the Tree Protection Methodologies outlined above at Section 6.33 and at Section 7 of this report would apply. As such, any adverse effects associated with this aspect are considered less than minor. Dutch Elm Disease

6.37 As indicated, elm trees on Sarsfield Street have been removed due to DED.

6.38 The fungus Ophiostoma non-ulmi, or DED is responsible for the rapid vascular collapse of elm. The fungi affect xylem parenchyma directly and indirectly at the whole plant level through wilt inducing toxins. Attracted by volatile compounds emitted by infected trees, the fungus is primarily spread in summer by the beetle, Scolytus multistriatus when temperatures exceed 20 degrees Celsius. Where infected trees are planted in close proximity, the fungi may also spread via root grafting.

6.39 In order to limit the spread, the following measures should be adopted:

• Pruning should be taken when the beetles are inactive (winter); • Infected material, including soil proximal to root matter, should be left on

site; • Where infected soil or organic material must be removed, it must be

transported in a covered state and disposed of and buried at an approved landfill;

• Tools and machinery used on infected material or soils must be cleaned using an appropriate sanitiser such as Steri-gene; and

• Heavily soiled machinery should be washed on site and then sanitised.

6.40 In this instance, should rooting activity be encountered within the road carriage way which can be attributed to elms, that material and surrounding soil will need to be disposed of by means of a controlled burial at an approved landfill, or returned in the backfill.

General: Pruning 6.41 With the exception of the removal of dead and diseased wood, all pruning;

• Results in immediate vascular dysfunction of conductive xylem; • Disrupts tree growth regulating pathways; • Alters, or delays, the accumulation, distribution and gradients of non

structural carbohydrates; • Affects the composition and relative stability of non structural

carbohydrates;




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• Reduces the assimilation of key essential nutrients, such as nitrogen; and • Results in the proportionate decline of root mass.

6.42 The tolerance or responsiveness to pruning wounds by means of effective

reaction and barrier zones (compartmentalisation) will depend on a number of factors including wound size, timing, cut location and placement, age, and vitality of the tree and, in particular, the relative sapwood content or presence of functional parenchyma.

6.43 Trees with reduced vitality are unlikely to maintain sufficient sapwood or non

structural carbohydrate reserves to complete effective reaction or barrier zones (encapsulation).

6.44 For these reasons, arboriculture best practice demands:

• Wound induced dysfunction should be made at branch protection zones, or

‘natural target pruning’; • Severance should be maintained within functional sapwood or diameters

<50mm and <100mm for weak and effective compartmentalising trees respectively (Dujesiefken and Liese, 2015);

• Subject to DED controls, pruning should be undertaken when parenchyma are most active late spring - summer (Dujesiefken and Liese, 2015); and

• Limited, if any, pruning should occur in respect of trees assessed of reduced vitality.

6.45 Physiologically, mature and over-mature trees have characteristics which increase their vulnerability to the effects of pruning, namely, increased colonial development (axial), larger and longer vessel elements (particularly in the stem and scaffold limbs) decreased radial anastomosis associated with reduced sapwood content (functional parenchyma) and a reduction in relative root mass.

Pruning: St Marys Road Park

6.46 Lift pruning of Trees 26 and 30 is required in order to provide sufficient aerial clearance for the movement of a 12T excavator to access a manhole located at the escarpment toe between the latter trees.

6.47 The pruning is limited to small diameter branches approximately ≤ 80mm in diameter at point of severance and includes deadwood and suppressed growth which is otherwise in decline (refer Section 4.18). Pruning will be undertaken by a qualified and experienced arborist in accordance with natural target pruning best practice.




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6.48 For these reasons, it is considered that the any effects on the subject

pohutukawa trees will be less than minor.

6.49 The aerial clearance required for the operation of the excavator will also require the removal of a stem from a ti kouka and removal of one Chinese privet, considered an invasive weed species.

6.50 The ti kouka is of reduced vitality due to suppression from neighbouring pohutukawa (Trees 26, 30), karaka and privet. It is considered the removal of the privet will benefit both karaka and ti kouka. Mr Simon Cook, Auckland Council has approved the removal of the privet, but requested the truncation of the ti kouka stem to enable regeneration from latent adventitious buds. Pruning: Street Trees

6.51 The Project will require proximity lift pruning above the carriageway of St Marys

Road and Sarsfield Street. As such pruning to 4.5m is a permitted activity pursuant to planning Rules under the AUP-OP, further discussion is not required.

6.52 However, as the level of pruning of Trees 36 and 53 exceeds the permitted clearance threshold, assessment is required.

6.53 Tree 36 shares many characteristics in common with Tree 53. Tree 36 is a former mature elm, since released. Decay is present or suspected at points of release. Other than the removal of a lateral subject to high end loading above the carriageway, minimal pruning is required in respect of Tree 36. The approximate diameter at point of severance is ≥ 150mm. Historically, the lateral has been the subject of multiple incidents of vehicle strike and would benefit from removal to avoid aggravation of pre-existing wounds. Several lesser laterals, as indicated in photograph 9, will also require severance.

6.54 It is considered that the pruning of Tree 36 is within the tolerance of the species and the age and condition of the subject tree.




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Photograph 9: Tree 36; branches requiring severance indicated.

6.55 At Section 6.31 it was noted that Tree 53 has an open column cavity from which annual fruiting bodies were observed. While the vitality of the tree is considered fair and has significant new growth, two epicormic branches presented with symptoms consistent with DED. Until such time as this is confirmed, the tree has been assessed on the basis that it will remain.

6.56 The pruning of Tree 53 will require extensive pruning on the South and West. It is envisaged that three laterals may require removal above the carriageway ranging between approximately 100mm – 150mm in diameter at point of severance and the reduction of three laterals ranging approximately between 40 100mm in diameter at point of severance above the berm.

6.57 When significant root disturbance and/or pruning is required, consideration might ordinarily be given to removal. However, in consultation with Mr Simon




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Cook, who wishes to retain the tree, it is considered that the effects may be managed by improving the growing conditions of the tree by the application of a root stimulant drench and mulching beforehand and reducing the altered loading on the column cavity through crown reduction.

6.58 It is considered that that these measures will minimise the adverse effects.

6.59 Assuming Tree 53 does not have DED, pruning should occur in winter prior and undertaken by a qualified arborist in accordance with natural target pruning best practices and adherence to DED hygiene procedures.

Photograph 10: Tree 53 with approximate position of limbs to be removed above carriage way indicated.




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Outfall Alignment

6.60 Two outfall options are proposed; a ‘Northern’ and ‘Southern’ alignment represented by a broken yellow line (Option 2) and a solid line (Option 1) respectively (refer Maps 7 and 8, Appendix B).

6.61 While GreensceneNZ understands that the outlet will be installed by trenchless technology beneath Curran Street, the remainder may be completed by open excavation. Apart from the issue of saline intrusion, there would be a preference for the Option 1 on the basis that works are unlikely to encounter significant rooting activity, if any (refer Figure 3).

6.62 Were Option 2 to be adopted, trenchless methods would be preferred which would need to be offset from the Structural Root Zone to offset oblique roots typically associated with Tree 108.

6.63 Tree protection measures at Section 7 of this report would apply in respect of all works in proximity of trees within this area.

Figure 3: ‘Snip’ from Map 8 (Appendix B) with the two alignment options and affected vegetation depicted.

Neighbouring Trees

6.64 With the exception of Tree 1 on New Street, on the information available to GreensceneNZ, it is not considered that the works will affect any other privately owned trees.




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Figure 4: Tree 1, Intersection of New and London Streets with the approximate location of the shaft indicated (concentric yellow circles).

6.65 Tree 1 is a mature Cinnamonum camphora, or camphor tree, with low branches

above the carriageway. There are two potential affects which will require management, namely, vehicle strike and lowering of ground water.

6.66 While it is understood that representative machinery has completed exploratory works in proximity of the proposed shaft, the concern is that the tree may be vulnerable to vehicle strike due to the displacement of high sided vehicles, such as rubbish or removal trucks, as a result of traffic management which otherwise limit movement around the tree. Allowance will need to be made for this.

6.67 In connection with the second aspect, other than direct root loss (which is not anticipated), the excavation associated with the shaft has the potential lower the water table or alter the movement of water, placing available water out of range of deep and absorbing roots.

6.68 Although this is not considered a significant risk, it will be important to monitor this aspect until the shaft is sleeved and backfilled. Should the effects of water deficit become evident, allowance for the provision of occasional deep slow irrigation will be necessary during and post construction. In this respect, ongoing monitoring for a period of no less than two years, during summer or periods of drought is recommended.




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7.0 TREE PROTECTION METHODOLOGY

The trees affected by the proposed works shall be protected from damage for the duration of the works. This is to be achieved by compliance with the following specific tree protection methodologies: General

7.1 A suitably qualified arborist (appointed arborist) is to be employed by the

applicant to monitor, supervise and direct all works within the root zone of protected trees for the duration of the proposed works.

7.2 The appointed arborist shall implement tree protection measures in accordance with Sections 4 and 6 of this report and the methodologies below and provide feedback and guidance to the contractors in respect to construction methodologies and machinery requirements in relation to all works within the protected root zone of the trees.

7.3 Prior to works commencing, a meeting shall be arranged by the main contractor so that the Tree Protection Methodology is explained by the appointed arborist to all contractors, sub-contractors and work site supervisory staff that are carrying out any works within the Protected Root Zones of protected trees. All aspects of the works that may affect the canopy or Protected Root Zone of protected trees shall be discussed and recorded and methodologies agreed with the appointed arborist.

7.4 The tree protection methodology shall be available at all times on the work site.

Site Specific Tree Protection Methodology: Protected Root Zone

7.5 “Protected Root Zone” is defined by the Unitary Plan as the “circular area of ground around the trunk of a protected tree, the radius of which is the greatest distance between the trunk and the outer edge of the canopy. For columnar crown species the protected root zone is half the height of the tree.”

7.6 Having regard to the nature of the works around the trees, prior to any works

commencing on site, the appointed arborist shall determine the placement of and nature of protective fencing, to the extent of the Protected Root Zone (or within proximity of the excavation face) of the trees. The protective fencing shall remain in place for the duration of the works. The appointed arborist shall monitor the condition of the protective fencing for the duration of the works.

7.7 Additional protection measures will be necessary where the protective fencing is impractical or the Protected Root Zone extends past perimeter fencing. This may include ground protection measures, such as geotextile fabric, mulch, track-mats or similar materials to the satisfaction of the appointed arborist.




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Provision must also be made to protect the trunk and low branches from mechanical damage, including stem and branch wraps.

7.8 Within the Protected Root Zone the following provisions shall apply:

a) No site huts or other temporary structures. b) No machinery shall be stored or operated within the protected root zone of

any tree and no materials, spoil, fill soil or equipment will be stored or temporarily placed within the drip line of any tree unless it can be kept wholly within the bounds of an existing load bearing surface such as concrete or asphalt.

c) No fuel or any other substance detrimental to plant health shall be stored within seepage range of any Protected Root Zone, including the refuelling of equipment.

d) No access within any areas fenced off for tree protection without the prior approval of the appointed arborist.

e) No adjustments to the tree protection fencing without prior consultation and agreement from the appointed arborist.

7.9 All excavations within root zones shall be carried out under the direct

supervision of the appointed arborist.

7.10 Any root remediation associated with the works within the protected root zone of the protected trees which are to be retained shall be undertaken in the following manner: a) All roots must be retained where possible. Where root retention is

unfeasible, approval for the removal of roots must be obtained from the appointed arborist prior to removal;

b) Root pruning should only occur once the full extent of the roots within the excavation has been revealed;

c) All root pruning is to be undertaken either by the appointed arborist or under the direction of the appointed arborist;

d) In any instance where roots are removed, the appointed arborist must be satisfied that (taking into consideration the tree species, age, condition and tolerance to root pruning) the long term health and stability of the tree will not be compromised.

e) Unless specified otherwise by arboricultural assessment, where the proposed works necessitate the removal of all roots encountered during open trenching within a protected root zone, the face of the excavation nearest any adjacent tree shall be hand dug or exposed with an air spade to 600mm (or the finished depth - whichever is the lesser depth). All roots encountered shall be cleanly cut back to the face of the excavation using a sharp implement such as a handsaw or secateurs. The excavation may then be completed by a machine excavator fitted with a straight-bladed




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bucket. The root containing face must be covered and kept damp for the duration of works or until soil is replaced.

f) Where the proposed works necessitate open trenching within a protected root zone, but retention of roots is considered feasible, the first 600mm (or the finished depth - whichever is the lesser depth) of the face of the excavation nearest any adjacent tree shall be hand dug or exposed with an air spade. All roots encountered that are less than 35mm in diameter may be cleanly cut back to the face of the excavation using a sharp implement such as a handsaw or secateurs. Where practical, all roots that measure over 35mm in diameter shall be retained.

g) Once roots in the line of works have been identified and either pruned or worked around and protected, excavations may be completed by a machine excavator fitted with a straight bladed bucket.

h) Records of all root pruning, including the size of roots removed and photographs must be maintained by the appointed arborist and supplied to Auckland Council Heritage Arborist and or Senior Arboriculture and Eco Specialist upon request, as appropriate.

7.11 All exposed roots and root ends shall be protected from drying out. This shall be

done by covering the excavated roots and root ends immediately with hessian (or similar), ensuring that the material is kept damp until backfilling occurs.

7.12 Backfilling exposed roots must be untaken by hand and limited to hand tamping for the first 200mm. Priority must be given to utilising site spoil (preferably that removed from the protected root zone) unless it is deemed unsuitable by the appointed arborist.

7.13 Unless permitted by the appointed arborist, only hand-operated plate compacters shall be used for compaction of materials when operating within the root zone of trees.

7.14 Excavations shall be lined with plastic prior to any concrete pour. The plastic is to remain in place as a permanent root barrier.

7.15 Where concrete is to be placed above exposed tree roots, a 50mm layer of coarse sand or top soil shall be used to cover the root before plastic is laid. In the case of asphalt, a geotextile fabric should be used in place of plastic.

7.16 No washing of equipment or machinery shall be undertaken within the Protected Root Zone or within seepage range of any protected tree. Special attention shall be paid to concrete products and petrol/diesel operated machinery so as to not contaminate the soil within the root zone of any protected tree.

7.17 A comprehensive plan for the use, delivery and disposal of concrete and all concrete products should be developed to ensure that no adverse effects of concrete use occur.




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7.18 All machinery used within the Protected Root Zone or within seepage range of

any protected tree, must be inspected for fluid leaks and otherwise be maintained fit for purpose by a suitably qualified person.

7.19 A comprehensive plan including measures for the early detection and containment of any inadvertent spill of substances harmful to plant growth must be available on site at all times. This should include provision for foliar contamination.

7.20 Any spillage of substances harmful to plant growth within the Protected Root Zone or within seepage range of any protected tree must be reported to the appropriate authorities, including the relevant Auckland Council Heritage Advisor and Arboricultural and Eco Specialist as soon as possible and in no case later than 24 hours following the incident. Measures taken to contain and mitigate the spillage must be provided.

Site Specific Tree Protection Methodology: Tree Trimming / Removal

7.21 All tree removals and tree pruning must be completed by a Council Approved arborist in accordance with Section 6 of this report following accepted best practice methodologies.

7.22 All removals must ensure that adjacent vegetation, including root zones are not damaged or subject to mechanical compaction, including restricting vehicle access and use of track mats or similar ground protection.

7.23 No Fuel or any other substance detrimental to tree health shall be stored within

seepage range of any protected root zone, including the refuelling of equipment.




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8.0 MITIGATION 8.1 In order to offset vascular dysfunction associated with root loss and disturbance

associated with Trees 53 and 54, it is recommended that:

I. A root stimulant drench is applied to the berm and permeable areas within the extended Protected Root Zones of the subject trees; and

II. Aged mulch is applied to a depth of 100mm within the berm in proximity of the subject trees for a distance of 2m beyond the protected root zone of either tree as soon as possible and maintained for a period of 3 years post works.

III. Pruning of the elms is undertaken in winter and, otherwise in accordance with hygiene measures outlined at Section 6 of this report.

9.0 CONCLUSION 9.1 The proposal concerns the proposed St Marys Bay and Masefield Beach Water

Quality Improvement Project and and involves installation of a pipeline primarily by means of trenchless technology connecting London Street and St Marys Road Park through to the north of Pt Erin Park where a pump station is proposed.

9.2 Ancillary connections by means of open excavation will be required within the protected root zones of vegetation.

9.3 On the basis that works are undertaken in adherence with the Tree Protection

Methodologies and mitigation measures outlined at Sections 6 and 7 of this report, it has been assessed that any adverse affects will be minimised.

9.4 The approval of Parks Senior Arboricultural and Eco Specialist, Mr Simon Cook,

has been obtained.

10.0 RECOMMENDED CONDITIONS OF CONSENT 10.1 All works associated with the proposed, St Marys Bay and Masefield Beach

Water Quality Improvement Project, affecting generally protected street and open space trees, should be carried out in accordance with the GreensceneNZ Ltd Arboriculture Assessment, dated 20 April 2018, submitted with the application.

10.2 The consent holder shall employ GreensceneNZ to monitor, direct and supervise all works within the Protected Root Zone of all protected vegetation for the duration of the works.




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10.3 Prior to works commencing there shall be a pre-commencement meeting on site with the consent holder, the project manager/site foreman and the consent holder’s appointed monitoring arborist. This meeting shall discuss the proposed work, how it is to be done, conditions of consent, tree protection, protective fencing requirements and installation.

10.4 The relevant Council Arborist responsible for the tree asset shall be invited to

the pre-start meeting. The consent holder shall give Council’s Arborists ten (10) working days prior notice of the intended date of the meeting.

10.5 The consent holder should ensure that all contractors, sub-contractors and work

site supervisory staff who are carrying out works covered by this consent are advised of the conditions of consent should be available at all times on the work site when works are occurring.

10.6 A copy of the resource consent and Arboriculture Assessment report by GreensceneNZ Limited dated 20 April 2018 submitted with the application shall be available at all times on the work site.

10.7 The mitigation measures described at Section 8 of the submitted

GreensceneNZ Limited Arboriculture Assessment dated 20 April 2018 are to be completed in accordance with the timeframes provided in the report.

Godfrey Fitzpatrick Consultant Arborist GreensceneNZ Limited




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APPENDIX A – PROTECTED TREE DETAILS Key: Hgt = Height

CRR/PRZ = Crown Radius (widest point)

SRZ = Structural Root Zone

CR As. = Crown Assessment

Stm A. = Stem Assessment

Rt. As = Root Assessment

Tree # Common Name Botanical Name Hgt

(m) DBH (mm)

SRZ (m)

CR (m) Comments Proposed Works

1 camphor laurel (Cinnamomum camphora)

13.8

1400 N/A 9.6 Canopy low hanging over the carriageway.

Proximity to shaft. Crown lift pruning for machinery and high side vehicles displaced by TMP may be required.

2 lemon (Citrus limon) 2 N/A N/A 1.5 Small tree recently planted in street planter pit.

No issues anticipated.








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Tree # Common Name Botanical Name Hgt (m)

DBH (mm)

SRZ (m)


5 water gum (Tristaniopsis laurina)

6 230 N/A 3.4 Fair specimen growing within street planter pit.

Crown lift pruning for machinery access may be required.

6 bead tree (Melia azedarach) 8.8 335 N/A 7.1 Fair specimen growing within street berm. Interior deadwood present. Canopy overhanging the carriage way.


7 birch (Betula pendula) 7.8 220 N/A 2.5 Fair specimen growing within street berm.


8 bead tree (Melia azedarach) 5.2 230 N/A 2.5 Fair specimen growing within street berm. Stem and basal damage.

3.45m above carriageway.


9 birch (Betula pendula) 8.2 195 N/A 4 Fair specimen growing within street berm.


10 Queensland box (Lophostemon confertus)

9.2 350 N/A 4.7 Fair specimen growing within street berm. Acute bifurcation at 2m. Canopy overhanging the carriage way. 3m above carriageway.





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DBH (mm)

SRZ (m)


11 Kermadec pohutukawa

(Metrosideros kermadecensis)

7.8 633 3.14 7.2 Good multi stemmed specimen growing within street berm. Canopy overhanging the carriage way. Large surface roots present.

4m above carriageway.


12 pepper tree (Schinus molle) 4.8 455.11 N/A 4.5 Good specimen growing within street berm. Mechanical damage to roots evident. Canopy overhanging the carriage way.

3.46m above carriageway.


13 puriri (Vitex lucens) 5.6 180 N/A 3.8 Fair specimen growing within street berm. Leaning towards road due to suppression from private pepper tree. 2.3m above carriageway.


14 birch (Betula pendula) 7.2 320 N/A 3 Fair specimen growing within street berm.


15 birch (Betula pendula) 10.2

260 N/A 4.6 Good specimen growing within street berm. Canopy overhanging the carriage way.

2.6m above carriage way.





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DBH (mm)

SRZ (m)


16 English oak (Quercus robur) 8.5 680 2.98 9 Fair specimen growing within the road reserve. Tree reduced from the boundary.

3.12m above edge of carriage way.

. Crown lift pruning for machinery access may be required.

17 pohutukawa (Metrosideros excelsa)

6.4 362 2.71 4.7 Fair multiple stemmed specimen growing within park. Mechanical root damage. Acute compression bifurcation.



7.5 402 2.78 4.2 Fair multiple stemmed specimen growing within park. Mechanical root damage. Acute compression bifurcation.



7.4 394 2.76 6.6 Fair multiple stemmed specimen growing within park. Mechanical root damage. Mechanical root damage. Acute compression bifurcation.


20 puriri (Vitex lucens) 5 190 1.82 4 Fair specimen growing within park Site office and security fencing to be erected on the edge of protected root zone.




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DBH (mm)

SRZ (m)



5.8 240 1.91 3.6 Poor acute bifurcation and storm damage

Site office and security fencing to be erected on the edge of protected root zone.

22 tawapou (Planchonella costata)

2.8 50 1.5 1.5 Juvenile specimen recently planted with extensive mechanical damage caused by lawn mower.

Modify entrance for vehicle access / erection of site fencing preferred.


10.6

13.5 Large old mature specimen present in 1940 aerial photos growing on coastal edge of Ko Takere Haere (St Mary's Bay). The tree has extensive aerial roots and primarily rooted into the more favourable uphill side of old coastal banks.

Site fencing and access to be formed on the edge of the PRZ.


4.6 90 95 0.3 2.7 Juvenile. Co dominant epigeal stem with asymmetric crown.

Site access and fencing within the PRZ. Transplant to suitable location.


3.6 220 1.75 1.7 Juvenile. Site access and fencing within the PRZ. Transplant to suitable location.




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DBH (mm)

SRZ (m)



9.8 2.2 4.6 17 Large old mature specimen present in 1940 aerial photos growing on coastal edge of Ko Takere Haere (St Mary's Bay). Multiple large stems. ‘Topped’ with poor pruning cuts; low hanging branches extending to near ground level.

Excavations within the PRZ for the installation of replacement of the manhole cover.


3.8 1008 2.13 2.7 Asymmetric form with mechanical mower damage to roots and canopy.

Site access and fencing within the PRZ/


4.6 290 1.97 2.7 Asymmetric, canopy suppressed, mechanical mower damage.

Site access and fencing within the PRZ/ Transplant to suitable location.


4.6 930 2.34 2.7 Asymmetric, canopy suppressed. Site access and fencing within the PRZ.


9.8 450 - 15.6 Large mature tree subject to root rotation and water erosion. Similar features to Tree 26.

Excavations within the PRZ for the installation of replacement of the manhole cover.

31 willow myrtle (Agonis flexuosa) 10.2

900 3.35 6.3 Fair specimen growing within berm. No clearance required. Fungal brackets present.

No clearance anticipated.


840 3.3 4.8 Fair specimen growing within berm. 3.8m above carriageway

Minor lift pruning required.




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DBH (mm)

SRZ (m)



900 3.29 7.1 Fair specimen growing within berm. Acute stem bifurcation.

Pruning of five branches less than 50mm to provide clearance required. Open trench excavations within the PRZ.

34 willow myrtle (Agonis flexuosa) 7 660 2.78 4.8 Fair specimen growing within berm. Suppressed canopy and previous stem failure.

Pruning of three branches up to 90mm amounts to 50 percent of canopy. Open trench excavations within the PRZ.


10.4

- - 6.5 Notable tree growing within private property.

No issues; anticipated works generally outside the PRZ.

36 elm (Ulmus procera) 14 855 3.2 11.4 Fair specimen growing within berm. Typical of former pollard, Dutch elm disease likely.

Pruning of two branches over carriageway required. 1 x 150mm to point of epicormic enlargement; 1 x 80mm; several 5/6 order branches < 50mm. Open trench excavations within the PRZ.

37 elm (Ulmus procera) 10 580 2.69 7.2 Fair specimen growing within berm Stem cavity and former pollard.

Pruning of two branches over carriageway required. Minor pruning cut of 20mm. Open trench excavations within the PRZ.




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DBH (mm)

SRZ (m)


38 elm (Ulmus procera) 16.4

900 3.31 11 Fair specimen growing within berm. Former pollard with large stem cavity. Significant epicormic growth. Dutch elm disease likely.

Crown lift pruning for machinery access along Sarsfield Street may be required. Machinery does not require full clearance at this point.


990 3.35 13 Fair specimen growing within berm. Former pollard with stem cavity. Significant epicormic growth. Dutch elm disease likely.

Crown lift pruning for machinery access along Sarsfield Street may be required. Machinery does not require full clearance at this point.

40 willow myrtle (Agonis flexuosa) 7.2 82 3 4.7 Fair specimen growing within berm. Fluted trunk.

Open trench excavations within the PRZ. Crown lift pruning for machinery access along Sarsfield Street may be required.

41 willow myrtle (Agonis flexuosa) 5 545 2.76 4.9 Fair specimen growing within berm. Column cavity present.

Crown lift pruning for machinery access along Sarsfield Street may be required. Open trench excavations within the PRZ.

42 puriri (Vitex lucens) 7.8 1100* N/A 9.6 Fair specimen growing within park with large cavity through centre.

Outside works area.

43 elm (Ulmus procera) 12 820 3.2 14.2 Fair specimen growing within park. Mechanical root damage and structural root fusion.

Outside works area.




Page 49 of 61


DBH (mm)

SRZ (m)


44 paperbark (Melaleuca salicifolia)

11 1000* N/A 6.6 Poor specimen growing within park. Previous stem failure. Large cavity in eastern stem.

Outside works area.

45 sycamore (Acer pseudoplatanus)

7.2 330 2.09 6 Poor specimen growing within park. Mechanical root damage.

Outside works area.

46 lilly pilly (Syzgium smithii) 15.8

865 3.27 5 Poor specimen growing within park. Compression bifurcation. Historic and active failures. Stem separation observed.

Outside works area.


15.8

1154 3.85 11 Fair multiple leader specimen growing within the park.

Outside works area.

48 maple (Acer sp.) 9.4 620* N/A 10.2 Fair specimen growing within park. Tree on southern lean due to suppression from surrounding trees.

Outside works area.


770 3.3 12.5

Co dominant stem removed with partial encapsulation growth. Wet wood from 150mm stub. Tip dieback observed.

PRZ extending to near the road edge. No issues anticipated.




Page 50 of 61


DBH (mm)

SRZ (m)


50 jacaranda (Jacaranda mimosifolia)

6.4 N/A N/A 1.5 Very poor specimen growing within park nearly dead.

PRZ extending to near the road edge. No issues anticipated.

51 elm (Ulmus procera) 7.2 570 N/A 6.7 Removed (DED)

Dutch elm disease suspected. Cavity in main stem. Fruiting bodies present. Former pollard.

Open trench excavations within the former PRZ.

52 elm (Ulmus procera) 7 480 N/A 6.6 Removed (DED)

Dutch elm disease suspected. Cavity in main stem. Fruiting bodies present. Former pollard.

Open trench excavations within the former PRZ.


865 3.22 9.9 Fair specimen growing within berm. Tip dieback, Dutch elm disease suspected. Cavity in main stem. Fruiting bodies present. Former pollard.

Open trench excavations within the PRZ.

Lift pruning required to 6.5m.

54 willow myrtle (Agonis flexuosa) 4.8 634 3.03 5 Fair multiple stemmed specimen growing within berm.

Open trench excavations within the PRZ. Lift pruning required to 6.5m.

55 elm (Ulmus sp.) (Ulmus procera) 10 810 N/A 6.3 Fair specimen growing within berm. Dutch elm disease suspected. Former pollard.





Page 51 of 61


DBH (mm)

SRZ (m)


56 elm (Ulmus sp.) (Ulmus procera) 21 1550 N/A 15 Flagging;

Dutch elm disease suspected.

Poor large specimen growing within park. Open bifurcation at 2m. Dead wood and wet wood present. Epicormic growth around base. Signs of stem dieback.

Growing within park. PRZ extending over the road edge. No issues anticipated.

57 lime tree (Tilia x europea) 17 861 N/A 11 Fair large specimen growing within park. Compression bifurcation and included bark.

Growing within park. PRZ extending to the berm edge. No issues anticipated.


8.4 292 N/A 6.6 Poor large multiple stem specimen growing within park. Mechanical root damage.

Growing within park. No issues anticipated.

59 puriri (Vitex lucens) 11.8

850* 10.7 Fair specimen growing within park. Basal cavity present.



20 700 N/A 9 Poor specimen growing within park. Acute orthotropic growth. Previous stem failure.





Page 52 of 61


DBH (mm)

SRZ (m)


61 lilly pilly (Syzgium smithii) 13 1015* N/A 7 Poor specimen growing within park. Basal stem cavities, acute bifurcation, stem cavities and fruiting bodies.

Growing within park. PRZ extending to the berm edge. No issues anticipated.

62 puriri (Vitex lucens) 18 990 N/A 10.4 Fair specimen growing within park. Multiple cavities.


63 sweet gum (Liquidambar styraciflua)

20.4

1045 4.3 13.8 Poor specimen growing within park. Compression bifurcation and extensive stem decay. Large previous failure.


64 puriri (Vitex lucens) 5 590 3.61 8.6 Fair multi stem specimen growing within park. Basal cavities. Canopy suppressed by adjacent trees.


65 lombardy poplar (Populus nigra italica)

24 1370 4.18 10.6 Fair specimen growing within park. Dead central stem and further decay suspected.


66 karo (Pittosporum crassifolium)

7.8 370 N/A 9 Poor specimen growing within park. South leaning associated with past failure. Suppressed by adjacent poplar.





Page 53 of 61


DBH (mm)

SRZ (m)


67 lilly pilly (Syzgium smithii) 5.6 550 N/A 6.8 Fair specimen growing within park. Basal compression bifurcation. Fruiting bodies present. Canopy suppressed by adjacent trees.


68 akapuka (Griselinia lucida) 5.8 400* 8.3 Fair specimen growing within park. Canopy suppressed by adjacent trees.


69 pohutukawa) (Metrosideros excelsa)

13.8

1065 4.33 15.2 Fair multiple stemmed specimen growing within park. One large splayed stem.



11.8

1018 4.01 11.8 Fair specimen growing within park. Stabilised failure on the tension side.


71 lime tree (Tilia cordata) 8.8 580 3.01 5 Good specimen growing within park. Mechanical root damage and basal epicormic growth.


72 lilly pilly (Syzgium smithii) 14.6

1200 3.62 7 Poor specimen growing within park. Compression bifurcation and fruiting bodies present.

Growing within Park. No issues anticipated.


6 340 N/A 2.5 Fair specimen growing within the road reserve on the edge of Curran Street.





Page 54 of 61


DBH (mm)

SRZ (m)


74 gum (Eucalyptus sp.) 10.4

800 N/A 6.8 Fair specimen growing within private property leaning over the footpath. Heavy eastern lean. Base not visible through fence.

Growing within Private property. No issues anticipated.

75 willow myrtle (Agonis flexuosa) 7.2 610 2.78 3.2 Fair specimen growing within berm. Open trench excavations near the PRZ. No issues anticipated.

76 tulip (Liriodendron tulipifera)

7 95 1.5 1.5 Newly planted juvenile specimen. Open trench excavations near the PRZ. No issues anticipated.

77 willow myrtle (Agonis flexuosa) 8.6 780 3.04 5.5 Fair specimen growing within berm. Trifurcation in stem.

Open trench excavations near the PRZ. Two branches to be pruned up to 90mm.

78 willow myrtle (Agonis flexuosa) 7 750 3.01 6.2 Fair specimen growing within berm. Bifurcation minor lift pruning up to 30mm

Open trench excavations near the PRZ. Minor canopy pruning up to 30mm may be required.

79 lombardy poplar (Populus nigra italica)

21.6

1060 3.69 7.2 Fair specimen growing within park. Northerly lean, reduced leaf size and mechanical root damage. Decay suspected where stem removed.



10.4

720 N/A 6.6 Fair specimen growing within park. Acute compression bifurcation and significant mechanical damage.





Page 55 of 61


DBH (mm)

SRZ (m)



10.4

1240 4.14 11 Fair specimen growing within park. Splaying branches and separation of main stems.


82 karo

totara

tree privet

oleander

(Pittosporum crassifolium),

(Podocarpus totara)

(ligustrum lucidum)

(Nerium oleander)

Up to 4

N/A N/A 1.5 Group of native and exotic specimens of various structure and vitality


83 bottlebrush (Callistemon sp.) Up to 3

N/A N/A 1.5 Group of small specimens. No issues anticipated.

84 maritime pine (Pinus pinaster) 17.2

870 3.27 10.9 Good specimen growing within park. Mechanical root damage.



11.2

800 3.04 6.8 Fair multiple stemmed specimen growing within park.



510 2.61 12 Fair specimen growing within park. Suppressed by surrounding trees.


87 maritime pine) (Pinus pinaster 19 870 3.21 12 Fair specimen growing within park. Suppressed by surrounding trees.





Page 56 of 61


DBH (mm)

SRZ (m)





89 maritime pine (Pinus pinaster) 16 460 2.51 12 Fair specimen growing within park. Heavy eastern lean away from surrounding trees.



615 2.58 10 Fair specimen growing within park. A symmetric stem.


91 maritime pine (Pinus pinaster) 15 440 2.51 10 Fair specimen growing within park. Suppressed by surrounding trees.


92 maritime pine (Pinus pinaster) 18 500 2.52 10 Fair specimen growing within park. Suppressed by surrounding trees.



8 770 3.01 12 Fair specimen growing within park. Suppressed by surrounding trees.





95 maritime pine (Pinus pinaster) 19 1090 3.57 10 Fair multiple stem specimen growing within park. Compression bifurcation and mechanical root damage present.





Page 57 of 61


DBH (mm)

SRZ (m)



4 300 N/A 8.5 Fair multiple stem specimen growing within park. Heavy eastern lean away from surrounding trees.



7.7 1730* 11.3 Fair multiple stem specimen growing within park growing out of old stump.


98 maritime pine

(Pinus pinaster)

15 340 2.25 3 Fair specimen growing within the road reserve on the edge of Curran Street. Poor live crown ratio.

Excavations within the technical PRZ. Some roots may be anticipated beneath road surface.


10.6

1000 3.01 7 Fair specimen growing within the road reserve on the edge of Curran Street.



20 400 2.32 7 Fair specimen growing within the road reserve on the edge of Curran Street.











Page 58 of 61


DBH (mm)

SRZ (m)









6.8 545 3.32 6 Fair multi stemmed specimen growing within NZTA designation.



5.5 355 2.29 4.3 Fair multi stemmed specimen growing within NZTA designation.



5.6 325 2.1 3.6 Fair specimen growing within NZTA designation.

Subject to northern alignment marine outfall option – some root loss anticipated.

108 Norfolk Island pine (Araucaria

heterophylla)

14.8

330 2.09 3.8 Fair specimen growing within NZTA designation.

Subject to northern alignment marine outfall option – some root loss anticipated.


6.6 370 2.18 3.8 Fair multi stemmed specimen growing within NZTA designation.

No issues anticipated. Subject to Tree Protection Method.




Page 59 of 61


DBH (mm)

SRZ (m)



6.6 420 2.39 5.5 Fair multi stemmed specimen with acute bifurcations growing within NZTA designation.

No issues anticipated. Subject to Tree Protection Method.


9.2 920 - 12 Fair specimen growing within park. Machinery access required within the PRZ. No issues anticipated Subject to Tree Protection Method.




Page 60 of 61

APPENDIX B – TREE LOCATION

5

4

32

1

Sourced from the LINZ Data Service and licensed for re-use under the Creative Commons Attribution 3.0 New Zealand licence0 10 205 Meters

Notes: M1 PROJECT NAME: St Marys Bay and Masefield Beach Water Quality Improvement Project

PROJECT ADDRESS: St Marys Bay

CLIENT: Watercare Services

FILE: I:\Clients\AUCKLAND COUNCIL\STORMWATER\Stormwater Projects\St Marys Bay Project Ponsonby Mar 17\GIS

GreensceneNZ Ltd. All Rights Reserved A: 145 Dominion Rd. Mt. Eden, Auckland 1466 P: 09 623 3514 www.greenscenenz.com

SCALE

CHECKED: AH

DRAWN: MB

PROJECT # G14807

1:500

Date: 12/4/2017Tree Designation

Park

Private

Private Notable

Street

SRZ

PRZ

MASTER_UP_Designation

Significant Ecological Areas Overlay

9

87 5 4

32

78

77

7675

3736

31

3029

21

74

99 97

6642

55

38

17

16

111108

Land Information New Zealand, EagleTechnology

Proposed Storage Tunnel

Proposed Gravity CSO drain

Proposed Wastewater Layout

Proposed Water Supply

Proposed Power Supply

Proposed Foul Air pipe

Proposed Marine Outfall


AUP MANA WHENUA OVERLAY

30

292827

26

2524

23

22

21

2019

18

17

16

15

1413







SCALE

CHECKED: AH

DRAWN: MB

PROJECT # G14807

1:500


Park

Private

Private Notable

Street

SRZ

PRZ



9

87 5 4

32

78

77

7675

3736

31

3029

21

74

99 97

6642

55

38

17

16

111108











9

8

7

30

2926

16

15

1413

1211

10

6







SCALE

CHECKED: AH

DRAWN: MB

PROJECT # G14807

1:500


Park

Private

Private Notable

Street

SRZ

PRZ



9

87 5 4

32

78

77

7675

3736

31

3029

21

74

99 97

6642

55

38

17

16

111108











3736

35

34

33

32

31

50

49

48

4746

45

44

43

42

41

40

39

38







SCALE

CHECKED: AH

DRAWN: MB

PROJECT # G14807

1:500


Park

Private

Private Notable

Street

SRZ

PRZ



9

87 5 4

32

78

77

7675

3736

31

3029

21

74

99 97

6642

55

38

17

16

111108











7877

76

75

74

73

7271

70

69

6867

66

65 64

6362

61

60

59

58

57

56

55

5453

5251







SCALE

CHECKED: AH

DRAWN: MB

PROJECT # G14807

1:500


Park

Private

Private Notable

Street

SRZ

PRZ



9

87 5 4

32

78

77

7675

3736

31

3029

21

74

99 97

6642

55

38

17

16

111108











73

9998

97

96

9594

93

9291

90

8988

8786

85

8483

82

81

80

7271

70

104

103

102101100

79







SCALE

CHECKED: AH

DRAWN: MB

PROJECT # G14807

1:500


Park

Private

Private Notable

Street

SRZ

PRZ



9

87 5 4

32

78

77

7675

3736

31

3029

21

74

99 97

6642

55

38

17

16

111108











111

110

109

108







SCALE

CHECKED: AH

DRAWN: MB

PROJECT # G14807

1:500


Park

Private

Private Notable

Street

SRZ

PRZ



9

87 5 4

32

78

77

7675

3736

31

3029

21

74

99 97

6642

55

38

17

16

111108











110

109

108

107

106

105







SCALE

CHECKED: AH

DRAWN: MB

PROJECT # G14807

1:500


Park

Private

Private Notable

Street

SRZ

PRZ



9

78

77

7675

3736

31

3021

74

99 97

6642

55

38

17

16

111

108














Page 61 of 61

APPENDIX C- AOA

Documents

Arboriculture Assessment - GreensceneNZ · G14807 – Arboriculture Assessment Apr18 GREENSCENENZ LIMITED PO Box 56 551, Dominion Road, Auckland P 09 623 3514 F 09 623 3515 E [email protected]