1. Introduction

The City Rail Link (CRL) project comprises the construction, operation and maintenance of a 3.4 km underground passenger railway, running between Britomart Station and the North Auckland Rail Line (NAL) in the vicinity of Mt Eden Station. The CRL involves the construction of two new underground stations at Aotea and Karangahape, and a redeveloped station at Mt Eden (refer to Figure 1-1). The design and construction of the CRL infrastructure between Aotea and Mt Eden Stations is being delivered by the Link Alliance.

This Contamination Delivery Work Plan (C DWP) has been prepared in relation to the Mt Eden Enabling Works (“the Project”).

Figure 1-1: CRL Route and Location

1.1 Overview of CRL works in Mt Eden

The CRL works in the Mt Eden area involve the construction of the southern section of the tunnel structures and the tie-in to the existing NAL, including the construction of the redeveloped Mt Eden Station. The Mt Eden Active Construction Zone (ACZ) and Construction Support Area (CSA) is generally located between Nikau Street to the north, State Highway 1 (SH1) to the east, Dominion Road to the west and the existing NAL to the south.

The works in this area include:

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Construction of an underground grade separation structure near Mt Eden Station; A new Mt Eden Station building incorporating passenger linkages; Modifications to the existing Mt Eden Station platforms; Road over rail bridges at Mt Eden Road, Normanby Road and Ruru Street with sections of road realignment; Grade separation structures for the existing and new rail lines to pass-over and connect with each other;

Pedestrian and cyclist bridge structures at Fenton Street and Porters Avenue; and New road linkages within the reinstated area post-construction.

Given the nature and scale of CRL works in Mt Eden, construction will be undertaken in a staged manner.

This C DWP only relates to the first stage of these works, the Mt Eden Enabling Works, as described in Section 2 below.

Following completion of the Mt Eden Enabling Works, works in this area will involve:

Main construction works –these works will include: Tunnel Boring Machine (TBM) operations, structure construction and waterproofing/tanking for cut and cover tunnels, utilities installation, retaining wall for Ruru street extension, construction of the rail line tie-ins including junctions and grade separation structures, realignment of the existing Western Line including platform reconstruction, grade separation of Normanby Road, pedestrian / cyclist bridges at Fenton and Porters, construction of the new station buildings. The Main Works will be undertaken from Mid 2020 through to 2024. Public realm reinstatement –these works will involve establishing the final finishings and features that will comprise the completed Mt Eden Station and surrounds and will likely to be undertaken from 2021 to first quarter-2024.

1.2 Purpose of the Contamination DWP

This C DWP has been prepared to identify measures that will be implemented to mitigate and manage the potential adverse effects relating to contaminated land during the Mt Eden Enabling Works. The objectives of the DWP are:

To avoid, remedy or mitigate the adverse effects of the construction on human health, which may result from the disturbance of contaminated materials during construction; and To minimise discharges to land or water from contaminated soils from within the footprint of the Mt Eden Enabling Works.

The CRL designation (conditions 57 and 58) requires the preparation of a C DWP while conditions 131- 150 of the discharge permit (R/REG/2016/1895) and land use consent (R/LUC/2016/1890) require a Contaminated Soils Management Plan (CSMP). These two separate document requirements have been combined and are addressed in this single C DWP.

This C DWP has been prepared by the Link Alliance in consultation with the Mt Eden Community and Business Liaison Group (CLG) and reviewed by Independent Peer Reviewer (IPR) prior to submission to Auckland Council (as per designation conditions 7 and 11, and condition 19 of the resource consent conditions).

This C DWP has been prepared in general accordance with Ministry for the Environment (MfE) Contaminated Land Management Guideline No. 1: Reporting on Contaminated Sites in New Zealand (revised 2011), and forms part of the Construction Environmental Management Plan (CEMP) for the Mt Eden Enabling Works.

1.3 Relevant conditions

Table 1-1 identifies the designation and resource consent conditions relevant to this C DWP and where they are addressed in the document.

Condition No. Condition Relevant section of DWP

CRL Designation Conditions

57.1 A Contamination DWP shall be prepared to manage the adverse effects relating to contaminated land during the construction of the City Rail Link or any part of it. This C DWP

57.2 The objective of the Contamination DWP is to avoid, remedy or mitigate the adverse effects of construction on human health which may result from the disturbance of contaminated materials during construction. This C DWP

57.3 To achieve the above objective the following shall be included in the Contamination DWP and implemented as required:

a Health and safety plan that addresses:

(i) Worker safety in relation to hazardous substances; and (ii) Worker training with regard to handling hazardous substances, identifying potentially contaminated soil/material, and notification procedures for discovery of contamination;

b Procedures for how erosion and sediment control, storm water, dust, and odour control measures will manage the removal of contaminated soil/material; Section 6.2

Section 5

c Procedures for contaminated soil classification, management and disposal of contaminated soil/material;

d Where any trenches/excavations during civil works are to be sealed as a result of contamination and how this is to be recorded;

e How and which work areas are to be restricted to authorised personnel only and procedures to limit the presence of ignition sources in these areas (e.g. no smoking within or adjacent to construction area, no welding or open flames near areas with high concentrations of hydrocarbon contamination);

f Procedures for the monitoring and management of the removal of contaminated soil/material by a suitably qualified environmental specialist;

g How the placement of re-used contaminated soil/material will be recorded and tracked;

h Where areas for stockpiling and storing contaminated soil/material will be established on the construction site and the procedures for managing the containment of the contaminated soil / material in these areas;

i Cross references to the specific sections in the Communication and Consultation Plan which detail how the general public are to be communicated with on the management of the adverse effects relating to the removal of contaminated soil/material. Section 5.3 and 5.4

Section 5.12

Section 6.2 and 6.6.2

Sections 4, 5.3 and 5.4

Section 5.4

Section 5.2

Section 6.8

Condition No. Condition Relevant section of DWP

58.1 At the completion of construction works a validation report will be prepared in accordance with any Ministry for the Environment guidelines and submitted to the Auckland Council Consent Monitoring officer documenting the management of soil and evidence of appropriate disposal. The validation report shall include a record of all analytical results, volumes, tip dockets, and any incidents or complaints and how these were addressed. The validation report shall also identify any areas which need on-going monitoring and management by the Requiring Authority. Section 8

Resource consent conditions

131 At least 20 days prior to the commencement of construction (earthworks), the Consent Holder shall provide a Contaminated Soils Management Plan (CSMP) to the Council (Team Leader Central Monitoring) for certification. The CSMP shall be prepared by a Contaminated Land Professional in accordance with the Contaminated Land Management Guidelines, No.1 - Reporting on Contaminated Sites in New Zealand, Ministry for the Environment (revised 2011). This C DWP

132 The Consent Holder shall request that Council (Team Leader Central Monitoring) provide a determination to the Consent Holder, in writing, within 10 working days of receipt of the CSMP, whether the CSMP can be certified as per the requirements of the Condition 134. Sections 4 and 9

133 No earthworks shall commence until:

a Certification is provided from the Council (Team Leader Central Monitoring) that the CSMP satisfactorily meets the requirements of Schedule 13 (A4) of the ACRP:ALW, and Section 4

b All measures identified in that plan as being required to be established prior to the commencement of earthworks have been established. Section 5.1

134 The CSMP shall address the following matters:

a The areas within the project site designated for the excavation works, including depths and extent of the proposed works, and an updated map showing the land disturbance activity areas; Section 2 and Appendix B

b Excavation, management, and disposal procedures for soil, sediment, dust, surface run-off water, perched groundwater, and groundwater, if encountered; Section 5

c Temporary containment, treatment, and testing procedures for any water getting in contact with the contaminated material if the disposal option is to the stormwater system or the marine environment is considered; Section 5.6

d Contingency measures for unexpected discovery of contamination; Section 7

e Proposed sampling and analysis, if applicable; and Section 5.10

f Any proposed works summary reporting. Section 8

Advice Note: The Council acknowledges that the CSMP is intended to provide flexibility for the management of the works and contaminant discharge. Accordingly, the Plan may need to be further updated. Any updates must be limited to the scope of this consent and consistent with the conditions of this consent. Section 9

Condition No. Condition

135 The Consent Holder shall notify the Council (Team Leader Central Monitoring) at least two working days prior to any earthworks activity on the site and provide the following details:

a Name and telephone number of the project manager and the site owner;

b Site address to which the consents relate;

c Activity to which the consents relate; and

d Expected duration of the works.

136 All disturbance of contaminated and potentially contaminated soil shall be carried out in accordance with the certified CSMP required by Condition 131 and any changes to the plan shall be submitted to the Council (Team Leader Central Monitoring) for certification prior to the change being implemented.

137 The Consent Holder shall ensure that all disturbance of contaminated soil shall be supervised by a suitably qualified and experienced Contaminated Land Professional, whose responsibilities shall include making sure that the soil management and disposal procedures, the contingency measures outlined in the certified CSMP required by Condition 131, and all relevant consent conditions are adhered to.

138 The Consent Holder shall ensure that regular inspections of the works area shall be carried out by a suitably qualified and experienced Contaminated Land Professional. These inspections shall be documented and the relevant records retained and provided to Council (Team Leader Central Monitoring) in the Site Validation Report (SVR) required by Condition 149.

139 The Consent Holder shall manage all soil disturbance works to minimise any discharge of debris, soil, silt, sediment or sediment-laden water from the subject site to either land, stormwater systems or the receiving marine environment. The implementation of erosion and sediment controls shall be in accordance with the ESCP required by Condition 53.

Advice Note: Measures such as covering the excavations overnight and during heavy rainfall, diverting overland flow around the works area, and appropriate treatment of any water collected in an excavation prior to the disposal may be required to comply with this condition.

140 The Consent Holder shall manage all soil disturbance works to avoid the potential for cross-contamination of materials to occur, in particular, movement of contaminated soil around the site and/or deposition of contaminated soil on other parts of the site shall be avoided. Where soils are identified for off-site disposal, they shall be loaded directly for removal, where possible, and all material shall be covered during transportation off site.

141 To minimise the spread of contaminated material, any temporary stockpiles of the excavated contaminated material shall be located within the catchment of erosion and sediment controls for the site. All stockpiles shall be covered with either polythene or an equivalent impermeable material when the site is not being worked and during periods of heavy rain. Relevant section of DWP

Section 5.1

This C DWP and Section 9

Section 4

Section 4 and Section 8

Section 5

Section 5.2-5.5

Section 5.2

Condition No. Condition

142 At all times, dust shall be controlled in accordance with the publication titled Good Practice Guide for Assessing and Managing the Environmental Effects of Dust Emissions, Ministry for the Environment (2001).

143 Excess soil or waste materials removed from the subject site shall be deposited at a disposal site which holds a consent to accept the relevant level or type of contamination. Advice note: Where it can be demonstrated that the soil has been fully characterised and meets the definition of ‘clean fill’ material in Section J1 of the Auckland Unitary Plan (Operative in Part), the removal of such material to a consented disposal facility is not required. In such circumstances, a record of the location, depth, and volume of the material removed as ‘clean fill’ should be kept for the purpose of being included in the SVR required by Condition 149).

144 The Consent Holder shall implement the procedures for the management, treatment, temporary containment, testing, and disposal of groundwater and surface run-off water via the stormwater system in accordance with the report titled Auckland City Rail Link: Resource Consent Package 2: Aotea Station to North Auckland Line Construction and CRL Operation: Draft Erosion & Sediment Control Management Plan, dated 13 May 2016, prepared by Aurecon New Zealand Limited, and provided with the application.

145 Any perched groundwater, or surface run-off water, encountered within the excavation area requiring removal shall be considered as potentially contaminated, and shall either:

a Be disposed of by a licensed liquid waste contractor; or

b Pumped to sewer, providing relevant permits are obtained; or

c Discharged to the stormwater system, provided testing demonstrates compliance with 50 times the Australian and New Zealand Environment Conservation Council (ANZECC) Guidelines for Fresh and Marine Water Quality (2000) for the protection of 95 percent of marine water species, and is free from petroleum hydrocarbons.

146 Where contaminants which have not been anticipated by the application are identified, works in the area containing the unexpected contamination shall cease until the contingency measures outlined in the certified CSMP required by Condition 131 have been implemented, and have been notified to the Council (Team Leader Central Monitoring). Any unexpected contamination encountered during the works and contingency measures implemented shall be documented in the Site Validation Report required by Condition 149.

Advice Note: In accordance with Condition 146, any unexpected contamination may include separate phase hydrocarbons, contaminated soil, perched water or groundwater. The Consent Holder is advised that where unexpected contamination is significantly different in extent and concentration from that anticipated, handling the contamination may be outside the scope of this consent. Advice should be sought from the Council (Team Leader Central Monitoring) prior

Relevant section of DWP

Section 5.7 and the Air Quality Management Plan (AQMP) prepared for the Mt Eden Enabling Works.

Section 5.4

Updated Erosion and Sediment Control Plan (ESCP) has been prepared for the Mt Eden Enabling Works.

Section 5.6 and Water Discharge Quality Monitoring Programme (WDQMP) included within the Flocculation Treatment Management Plan (FTMP) prepared for the Mt Eden Enabling Works.

Section 7

Condition No. Condition

to carrying out any further work in the area of the unexpected contamination to check this is within the scope of this consent.

Relevant section of DWP

147 All imported fill shall: Section 5.11

a Comply with the definition of clean fill material in Section J1 of the Auckland Unitary Plan (Operative in Part); and

b Be solid material of an inert nature; and

c Not contain hazardous substances or contaminants above recorded natural background levels of the receiving site.

Advice Note: Background contamination levels for the site receiving clean fill can be found in Technical Publication No. 153, Background concentrations of inorganic elements in soils from the Auckland Region, Auckland Regional Council (2001).

148 All sampling and testing of contamination on the site shall be overseen by a suitably qualified and experienced Contaminated Land Professional. All sampling shall be undertaken in accordance with Contaminated Land Management Guidelines, No.5 –Site Investigation and Analysis of Soils, Ministry for the Environment (revised 2011). Advice Note: All testing and analysis should be undertaken in a laboratory with suitable experience and ability to carry out the analysis. For more details on how to confirm the suitability of the laboratory please refer to Contaminated Land Management Guidelines, No.5 –Part 4: Laboratory Analysis, Ministry for the Environment (revised 2011).

149 Within three months of the completion of earthworks on the site, the Consent Holder shall provide a Site Validation Report (SVR) to the Council (Team Leader Central Monitoring). The SVR shall be prepared by a suitably qualified and experienced Contaminated Land Professional in accordance with the Contaminated Land Management Guidelines, No.1 - Reporting on Contaminated Sites in New Zealand, Ministry for the Environment (revised 2011). Section 5.10

Section 8

150 The SVR required by Condition 149 shall address the following matters: Section 8

a A summary of the works undertaken, including a statement confirming whether the excavation of the site has been completed in accordance with the certified CSMP required by Condition 131;

b The location and dimensions of the excavations carried out, including the relevant site plan;

c A summary of soil, groundwater, and surface run-off water testing undertaken, if applicable, including tabulated analytical results, and interpretation of the results in the context of the Contaminated Land Rules of the Auckland Unitary Plan (Operative in Part);

d Copies of the disposal dockets for the contaminated soil and ‘clean fill’ material removed from the site;

e Records of any unexpected contamination encountered during the works and contingency measures undertaken, if applicable;

f Details regarding any complaints and/or breaches of the procedures set out in the certified CSMP required by Condition 131 and the conditions of this consent;

g Results of testing, if required, of any spoil disposed offsite; and

Condition No. Condition Relevant section of DWP

h Results of testing of any imported fill material to ensure compliance with the definition of clean fill material in Section J1 of the Auckland Unitary Plan (Operative in Part).

1.4 Sustainability

The Link Alliance is seeking an Infrastructure Sustainability Council of Australia (ISCA) Infrastructure Sustainability (IS) Rating. Further details can be found in the CEMP and Sustainability Rating Management Plan. Project sustainability requirements that relate directly to this C DWP are included in Appendix A. These requirements are imbedded within the Delivery Work Plans and management plans for the Project to ensure that sustainability is a key focus and ‘the way we do things’.

In some cases, the IS requirements and sustainability goals enhance the designation and consent requirements.

1.5 Contamination DWP review and updates

This C DWP is a live document that will be reviewed and updated at least annually, or as a result of a material change to Mt Eden Enabling Works, or to address unforeseen adverse contamination effects arising from construction, or unresolved complaints. Refer to the CEMP for further detail on the review and updating process.

1.6 Contamination DWP author

This C DWP has been prepared and reviewed by Contaminated Land Specialists (CLS).

Elyse LaFace is a Senior Environmental Scientist at Tonkin & Taylor Ltd (T+T) and is the author of this C DWP. Elyse has a Master of Environmental Management, Bachelor of Science with Honours degree in Biology and Geology and a Diploma in Engineering (Civil). She has more than 10 years’ professional experience in the environmental practice area.

Lean Phuah is the Discipline Director - Science at T+T and has reviewed this C DWP. Lean has a Bachelor of Civil Engineering degree from the University of Canterbury and is a chartered professional engineer (CPEng) working in the environmental practice area and certified environmental practitioner (CENVP(SC)). She has more than 20 years’ experience in investigations, assessment, management and reporting of contaminated sites.

Elyse and Lean are suitably qualified and experienced practitioner (SQEP) under the Resource Management (National Environmental Standard for Assessing and Managing Contaminants in Soil to Protect Human Health) Regulations 2011 (NES Soil).