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 in the vicinity of Mt Eden Station. The CRL also involves the construction of two new underground stations at Aotea and Karangahape and the redevelopment of the station at Mt Eden

(refer to Figure 1-1). The design and construction of the CRL infrastructure between the Aotea and Mt Eden Stations is being delivered by the Link Alliance.

Figure 1-1: CRL Route and Location

This Contamination Delivery Work Plan (CDWP) has been prepared in relation to the Aotea Station main construction works.

1.1 Aotea Station Overview

Once completed, the Aotea Station will include platforms, lifts, escalators, rooms for housing stations and tunnel services equipment, an entrance building at Wellesley Street, two additional entrance buildings at Victoria Street, a Plenum at Kingston Street, services, internal and architectural finishings, structural fittings, utilities services diversions and connections.

The location of the Aotea Station is primarily beneath Albert Street, connecting the Contract 2 (C2) cut and cover tunnels to the north and the tunnel-boring-machine (TBM) tunnels to the south. The

works are approximately 380m long by 18m wide and will be excavated around 18-20m below

ground level. Additional boxes branch off from the tunnel alignment at Kingston Street (to form the Plenum), Victoria Street (for two entrance buildings to the Aotea Station) and Wellesley Street (to form the main entrance building to the Aotea Station (refer to Figure 1-2 below) 1 .

1 Auckland Transport (AT) has obtained a resource consent for an Over Station Development (OSD) on the Bledisloe Car Park site (Council Reference R/LUC/2016/2647). The proposal involves the construction of a 24-level building comprising offices, retail and food and beverage tenancies, and public features including a plaza and a through site link. The proposed OSD is not part of the Link Alliance contract and will be progressed separately by Panuku.

Figure 1-2 Indicative Aotea Station indicating length of underground station box with the associated above-ground Main Station structure at Wellesley Street, entrance structures at Victoria Street and the Kingston Street Plenum.

Aotea Station Main Works

Given the nature and scale of the Aotea Station construction, works will be undertaken in a staged manner, involving:

Five stages of early works (canopy removal, network utility relocation and site establishment work), being undertaken from October 2019 to March 2020 (Stages 1 to 3) and December 2019 through to August 2020 (Stages 4 and 5); these works have been authorised by separate Outline Plans (Council ref. OPW60345651 and OPW60348747);

Main construction works (the ‘Aotea Station main works’) involving construction of the

station box, associated above ground structures, mined tunnels for the rail tracks, internal

finishings, structural fitout, all Mechanical, Electrical, Fire and Hydraulic (MEFH) installation, and architectural finishings 2 . The Aotea Station main works will be undertaken from early2020 through to late-2023; and

Ground reinstatements (from late-2022) and urban realm improvements. These works will be described in a future Outline Plan 2 .

This CDWP relates to works associated with disturbance of potentially contaminated materials that may be exposed during d-walling/ piling activities and excavation of the station box.

Refer to Section 2 of the Construction Environmental Management Plan (CEMP) for a detailed description of the Aotea Station main works.

1.2 CDWP Staging

To reflect the staged construction approach for Aotea Station, CDWPs are being developed in stages.

This CDWP addresses the Aotea Station main works, which are detailed in the CEMP. An overview of the main works is provided in Section 2 of this CDWP.

1.3 Purpose of the CDWP

This CDWP has been prepared to identify measures that will be implemented to mitigate and manage the potential human health and environmental effects associated with contaminated soil during the main works.

The objective of the CDWP is to detail the best practicable options to avoid, remedy, or mitigate the adverse effects of contaminated soil discharges generated by construction activities.

This CDWP has been developed in consultation with the Aotea Community and Business Liaison Group (CLG) and has been reviewed by Independent Peer Reviewer (IPR) prior to submission to Auckland Council (as per designation conditions 7 and 11, and resource consent condition 19). A record of consultation outcomes and IPR review comments is included in Appendix B.

This CDWP has been prepared by the Link Alliance and forms part of the CEMP for the main works.

Page 7 | Aotea Station Main Works 2 It is noted the architectural finishing component of the works (the exterior look and feel of the Aotea Station) will occur during Phase 5 of the Aotea Station main works (approx. 2022 –December 2023). These finishings are still being designed and determined. Once designs are completed a separate Outline Plan and suite of DWPs will be prepared, describing the finishings and other permanent above ground public realm reinstatements. That Outline Plan package will address the relevant Urban Design related Designation conditions (condition 47 –54, including landscaping (condition 55.3(c))).

1.4 Relevant Conditions

Table 1-1 identifies the designation and resource consent conditions relevant to this CDWP and where they are addressed in the document. It is noted that the designation conditions require the preparation of a CDWP, while the resource consent conditions require preparation of a Contaminated Soils Management Plan (CSMP). The requirements of both the designation and resource consent conditions are combined and addressed in this single CDWP.

Table 1 -1 : Contaminated Land Conditions and Location in this CDWP

Condition No. Condition Relevant section of DWP

CRL Designation Conditions

57.1

57.2

57.3 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.

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.

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

(a) 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, stormwater, dust, and odour control measures will manage the removal of contaminated soil / material;

(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 Communications and Consultation Plan which detail how the general public will be communicated with on the management of the adverse effects relating to the removal of contaminated soil / material. This document

Section 1.3

Section 6

Section 5.2 Section 5.5

Section 5.3

Not applicable

Section 6

Section 5.3

Section 5.6

Section 5.3

Section 6.5

Condition No. Condition

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.

Resource Consent Conditions

131

132

133

134

135

136

At least 20 working 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).

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.

No earthworks shall commence until a. certification is provided Council (Team Leader Central Monitoring) that the CSMP satisfactorily meets the requirements of Schedule 13(A4) of the ACRP:ALW and b. all measures identified in the plan as being required to be established prior to commencement of earthworks have been established.

The CSMP shall address the following matters: a. the areas within the project site designated for excavation works, and an updated map/s showing the land disturbance activity areas, b. excavation management, and disposal procedures for soil, sediment, dust, surface run-off water, perched groundwater, and groundwater if encountered. c. temporary containment, treatment, and testing procedures for any water getting in contact with contaminated material if the disposal option is to the stormwater system or the marine environment is considered. d. contingency measures for unexpected discovery of contamination. e. proposed sampling and analysis, if applicable. f. any proposed works summary reporting. 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 site owner, b. site address to which the consents relate, c. activity to which the consents relate, and d. expected duration of works. All disturbance of contaminated and potentially contaminated soil shall be carried out in accordance with the certified CSMP required by Condition 131 and

Relevant section of DWP

Section 8

This document

Noted

Noted

Section 5 Section 6 Section 7 Section 8

Noted

Noted Section 1.6

Condition No. Condition

137

138

139

140

141

142

143

144

145

any changes to the plan shall be submitted to the Council (Team Leader Central Monitoring) for certification prior to the change being implemented. 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 practices, the contingency measures outlined in the certified CSMP required by Condition 131, and all relevant consent conditions are adhered to. 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. The Consent Holder shall manage soil disturbance works to minimise any discharge of debris, soil, silt, sediment, or sediment-laden water from the 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. 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 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 directed for removal, where possible, and all material shall be covered during transportation off site. To minimise the spread of contaminated material, any temporary stockpiles of excavated contaminated materials 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. 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). Excess soil or waste materials removed from the subject site shall be deposited at the disposal site which holds a consent to accept the relevant type of contamination. 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 and Sediment Control Management Plan, dated 13 May 2016, prepared by Aurecon New Zealand Limited, and provided with the application. Any perched groundwater or surface run-off water encountered within the excavation area requiring removal shall be considered 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.

Relevant section of DWP

Section 5.3 Section 7

Section 5.3 Section 8

Section 4 Section 5

Section 4 Section 5

Section 5

Section 5.5

Section 5.3

Section 5.4

Section 5.4 and Water Discharge Quality Monitoring Programme (WDQMP) included within the Flocculant

Condition No.

146

147

148

149 Condition

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 Site Validation Report required by Condition 149. All imported fill shall: a. comply with the definition of clean fill material 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. 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 Soil, Ministry for the Environment (revised 2011). Within three months of the completion of earthworks on the site, the Consent Holder shall provide a Site Validation Report 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).

Relevant section of DWP

Treatment Management Plan (FTMP) prepared for the Aotea Main Works.

Condition 7

Section 5.6

Section 5.3

Section 8

1.5 Sustainability The Link Alliance is seeking an Infrastructure Sustainability Council of Australia (ISCA) Infrastructure Sustainability (IS) Rating. Further details can be found in the Project CEMP and Sustainability Rating Management Plan. Project sustainability requirements that relate directly to this CDWP are included in Appendix C. These requirements are imbedded within the CDWP 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.

1.6 CDWP Review and updates This CDWP is a live document that will be reviewed at least annually, or as a result of a material change to the project, or to address unforeseen adverse effects relating to contaminated land arising from construction, or unresolved complaints. Any material changes to this DWP must be certified by Auckland Council prior to any on-site activity reliant upon the change commencing.

1.7 CDWP Author

This CDWP has been reviewed by senior qualified person (Project Contaminated Land Professional), Emma Trembath. Emma is a Technical Director and leader of the AECOM geoscience and

remediation services business line in New Zealand. She has over 17 years’ experience in contaminated land and landfill industries, including considerable experience in undertaking, managing, and reporting on contaminated land and landfill investigations, works programmes, and remediation projects for public and private sector clients.