Groundwater Abstraction Environmental Management Plan

Thornlie-Cockburn Link

For more information contact Public Transport Authority Public Transport Centre, West Parade, Perth WA 6000 PO Box 8125, Perth Business Centre, Perth WA 6849 Telephone: (08) 9326 2000 Email: [email protected] www.pta.wa.gov.au

Public Transport Authority  Groundwater Abstraction Environmental Management Plan

Groundwater Abstraction Environmental Management Plan – Thornlie-Cockburn Link METRONET Stage 1 Initiatives: Yanchep Railway Extension and Thornlie-Cockburn Link

Document Approval

Rev Date Prepared by Reviewed By Approved by

0 23-Sep-2020 Michael Chen Lionel Pero Declan Larkin 1 19-Nov-2020 Klinton Breese Lionel Pero Stuart Wright Signature:

Signature:

Document Details

PTA Project number: 180093

PTA Document number: N/A

NEWest Document number: W801032-TCL-NEW-EN-PLN-0009

Revision date: 19-Nov-2020

Revision: 1

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DETAILS OF REVISION AMENDMENTS AND PLAN TERMINOLOGY

Document Control The Alliance Manager is responsible for ensuring that this plan is reviewed and approved. The Environment and Sustainability Manager is responsible for updating this plan to reflect changes as required.

Amendments Any revisions or amendments must be approved by the Alliance Manager and/or client before being distributed or implemented.

Revision Details

0 Issued for use 1 Issued for use

Terms and Definitions

Term Meaning Groundwater Level The level at which the pressure in the pore water in the subsurface material is atmospheric. The terms groundwater level, phreatic surface, groundwater table and water table may be used interchangeably. If Perched Groundwater conditions exist there may be more than one groundwater level at any particular plan position.

Abbreviations and Acronyms

Abbreviation/Acronym Definition AHD Australian Height Datum ASS Acid Sulfate Soils CCW Conservation Category Wetland CEO Chief Executive Officer DWER Department of Water and Environmental Regulation EMP Environmental Management Plan EPA Environmental Protection Agency kL/yr Kilolitre per year L/s Litre per second MS Ministerial Statement

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Abbreviation/Acronym Definition

OLE Overhead Line Equipment PCG Perth Coastal Grid PTA Public Transport Authority of Western Australia TCL Thornlie - Cockburn Link TEC Threatened Ecological Community

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CONTENTS 1. Context, Scope and Rationale ...... 8 1.1 Proposal ...... 8 1.2 Key Environmental Factors ...... 8 1.2.1 Hydrogeology...... 9 1.2.2 Construction Water Supply Source ...... 9 1.3 Condition Requirements...... 12 1.4 Rationale and Approach...... 14 1.5 Surveys and Study Findings...... 14 1.5.1 Preliminary Hydrogeological Assessment (Golder, 2019)...... 15 1.5.2 Groundwater Monitoring Event 1 (Golder, 2020a) ...... 16 1.6 Key Assumptions and Uncertainties ...... 17 1.7 Management Approach ...... 17 1.7.1 Key Impacts and Risks ...... 17 1.7.2 Management Approach ...... 18 1.8 Rationale for Choice of Provisions ...... 19 1.9 Index of Biodiversity Surveys for Assessments (IBSA) ...... 19 2. Environmental Management Plan Provisions ...... 19 2.1 Condition Requirements...... 20 2.2 Outcomes and Key Environmental Values...... 20 2.3 Environmental Criteria ...... 20 2.3.1 Rationale for Setting Threshold Criteria and Trigger criteria ...... 21 2.4 Management Objectives and Actions ...... 22 2.5 Monitoring...... 23 2.5.1 Monitoring Locations and Well Details ...... 23 2.5.2 Monitoring Program ...... 25 2.5.3 Monitoring Methodology ...... 26 2.6 Contingency Actions ...... 28 2.6.1 Trigger Criteria Contingency Actions ...... 28 2.6.2 Threshold Criteria Contingency Actions ...... 29 2.7 Reporting ...... 30 2.7.1 Monitoring Report ...... 30 2.7.2 Annual Compliance Assessment ...... 30 2.7.3 Reporting on Exceedance of Trigger and/or Threshold Criteria ...... 31 3. Adaptive Management and Review of the EMP ...... 31 3.1 Adaptive Management ...... 31 3.2 Review of EMP ...... 32

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4. Stakeholder Consultation...... 32 5. References ...... 33 Figures ...... 34

Tables Table 1: Project Summary ...... 7 Table 2: Indirect Impacts Relevant to Groundwater Abstraction ...... 9 Table 3: Production Well Details ...... 11 Table 4: Condition Requirements and In-Plan Section References ...... 12 Table 5: Assessment of Suitability of the Production Wells (Golder, 2019) ...... 15 Table 6: Suitability of Production Wells Location ...... 16 Table 7: Bore Location Details and Distance to Nearest Potential Impact Area ...... 18 Table 8: Ministerial Statement 1114 Condition to Develop the EMP ...... 20 Table 9: Interim Groundwater Level Trigger Criteria and Threshold Criteria for Monitoring Wells ...... 22 Table 10: Management of Key Impact ...... 22 Table 11: Monitoring Well Details ...... 24 Table 12: Groundwater Level Monitoring Schedule ...... 25 Table 13: Banksia Woodland and Wetlands Monitoring Schedule ...... 27 Table 14: Trigger Criteria Contingency Actions ...... 28 Table 15: Threshold Criteria Contingency Actions ...... 29

Figures after Text Figure 1: Location Plan

Figure 2: Bore 1 (Kwinana Fwy) – Existing Water Supply Well (Superficial Aquifer) Figure 3: Bore 2 (Roe Hwy) – Existing Water Supply Well (Superficial Aquifer) Figure 4: Bore 3 (Karel Avenue) – Proposed Water Supply Well (Superficial Aquifer)

Figure 5: Bore 4 (Ranford Road) – Proposed Construction Water Supply Well (Leederville Aquifer) Figure 6: Bore 5 (Market City) – Proposed Water Supply Well (Superficial Aquifer) Figure 7: Bore 6 (Thornlie) – Proposed Water Supply Well (Superficial Aquifer) Figure 8: Proposed Photo Monitoring Location for Bore 3 Figure 9: Proposed Photo Monitoring Location for Bore 5 Figure 10: Proposed Photo Monitoring Location for Bore 6

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Summary

This condition Environmental Management Plan for the Thornlie-Cockburn Link (TCL) project groundwater abstraction is submitted by the Public Transport Authority in accordance with condition 6-1 and 6-2 of Ministerial Statement 1114. Project summary information is provided in Table 1. Table 1: Project Summary

Item Detail

Title of Project Thornlie-Cockburn Link

Proponent Public Transport Authority of Western Australia

Ministerial Statement 1114

Purpose of this condition EMP Fulfil the requirements of conditions 6-1 and 6-2 of MS 1114.

EPA’s key environmental factor Inland Waters

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1. CONTEXT, SCOPE AND RATIONALE

1.1 PROPOSAL The Public Transport Authority (PTA) of Western Australia (‘the Proponent’) is implementing the first stage of METRONET’s priority projects, which includes the connection of the existing Thornlie Station (located on a spur from the Armadale line), to the Cockburn Central Station on the Mandurah line (known as the Thornlie - Cockburn Link (TCL) Project), herein referred to as the TCL project (refer to Figure 1 for a location plan). The TCL project includes the following: ▪ 17.6 km of new PTA passenger double track from Thornlie Station to Cockburn Central Station and associated infrastructure (i.e. overhead line equipment (OLE), signalling, communications etc.). The double track will pass through an existing cut and cover tunnel structure located at Glen Iris. ▪ Duplication of the existing PTA passenger single track from Beckenham Junction to Thornlie Station (i.e. from single track to double track). The single to double track duplication will pass through an existing cut and cover tunnel structure located at Kenwick Link. ▪ Relocation of 11.5 km of Arc Infrastructure (Arc) freight double track between Thornlie Station and Glen Iris Tunnel. ▪ Two new stations at Ranford Road and Nicholson Road, associated structures/connections and car parks. Upgrades to Thornlie Station and Cockburn Central Station. ▪ New rail over river bridge at Canning River. New road over rail bridges at Ranford Road. ▪ New pedestrian over rail bridge at Elliot Place / Cameron Street. An existing rail culvert is located in close proximity to the proposed pedestrian bridge and Tom Bateman Reserve. This culvert will be modified and extended as part of the works. The Environmental Protection Authority (EPA) assessed the TCL project at a level of Referral Information [s39A (2) (b) with Additional Information (s0(2)(a)] with a four-week public review period on 27 June 2018. The EPA recommended environmental approval for the TCL project and published their Report and Recommendations (Report 1646) on the 12 August 2019. The State Ministerial Approval (Ministerial Statement No. 1114) was received from the Minister for Environment on 23 September 2019.

This condition Environmental Management Plan (EMP) aims to minimise impacts to the hydrological regimes that support the environmental values as listed in condition 6-1 of the MS 1114. This condition EMP is to be implemented from commencement of groundwater abstraction and for at least twelve (12) months following the completion of groundwater abstraction, or until the Chief Executive Officer (CEO) of the Department of Water and Environmental Regulation (DWER) has confirmed by notice in writing.

1.2 KEY ENVIRONMENTAL FACTORS The following key environmental factor has been identified as being relevant to this condition EMP (EPA, 2019): ▪ Inland Waters – To maintain the hydrological regimes and quality of groundwater and surface water so that environmental values are protected. The indirect impacts attributable to the groundwater abstraction activities of the TCL project, and relevant to the EPA factor above, are described below in Table 2.

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Table 2: Indirect Impacts Relevant to Groundwater Abstraction

Environmental Affected environmental Activity Impact aspect of the value* proposal

Groundwater Groundwater levels adjacent Altered groundwater Localised lowering of abstraction for to: levels from the groundwater table construction abstraction to supply causing indirect ▪ Priority 3(i) Ecological water water for construction impacts such as Community Low lying requirements purposes. degradation and Banksia attenuata potential loss of flora woodlands or and fauna. shrublands (‘floristic

community type 21c’) outside the development envelope. ▪ Conservation Category and Resource Enhancement Wetlands (UFI 6912, UFI 6910, UFI 14900, UFI 15925, UFI 6776, UFI 13332, UFI 7499, UFI 7447 and UFI 15926) outside the development envelope.

*Threatened Ecological Community (TEC) Claypans of the Swan Coastal Plain identified by UFI 13365 (Brixton Street Wetlands) is not expected to be impacted by groundwater abstraction as all production bores are located far from this TEC (i.e. >1000 m). Conservation Category and Resource Enhancement Wetlands UFI 7446 is located outside the radius of influence of all production bores covered in this EMP.

1.2.1 HYDROGEOLOGY The TCL alignment is underlain by the Jandakot Mound, a superficial unconfined sand aquifer covering an area of approximately 522 km2, extending from the Swan River to the north of the Serpentine River. Underlying the Jandakot Mount is the Leederville Aquifer, which is underlain by the deep, mostly-confined Yarragadee aquifer. Most of the Jandakot Mound is separated from the deeper Leederville aquifer by a confining layer of Kardinya Shale. These relatively impermeable shales limit the potential for inter-aquifer impacts of abstraction across most of the Jandakot Mound. The disconnection created by the shales means abstraction from the Superficial aquifer has a greater impact on wetlands on the Jandakot Mound than abstraction from the deep aquifers. The presence of the Kardinya Shale suggests that the volumes licensed from the Leederville and Yarragadee aquifers are very unlikely to impact on wetlands on the Jandakot Mound. Perched water may be encountered along the alignment. Perched water is defined as water suspended above the superficial aquifer by relatively impervious layers such as coffee rock or Guildford Formation (fines dominated). It is generally associated with rainfall infiltration, surface water runoff and runoff/recharge by residential dwellings.

1.2.2 CONSTRUCTION WATER SUPPLY SOURCE Groundwater abstraction for the purpose of sourcing construction water is required along the proposed alignment. The TCL project is anticipated to be ongoing for approximately three and a half

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years, and it is likely that the greatest construction water requirement would be for moisture conditioning during placement and compaction of fill and dust suppression. The construction water supply will be supplied by groundwater from five production wells installed in the Superficial Aquifer and one well installed in the Leederville Aquifer. Table 3 provides the details of the production wells that have been installed or are planned to be installed along the alignment and the environmental values listed in Condition 6-1 of MS 1114 that might be potentially impacted by the proposed groundwater abstraction at each production well based on its estimated drawdown extent and distance to the nearest environmental value. The locations of the production wells are shown in Figure 1.

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Table 3: Production Well Details

Location Total Potentially Coordinates Depth (m) Project Estimated Distance to Nearest Impacted Abstraction Average Estimated (PCG2020) Elevation Aquifer Duration1 Max Environmental Values Environmental Well ID Status Volumes Pumping Radius of (m AHD) Name Abstraction Groundwater (Banksia Woodland# Value in MS Total Screened (kL/yr) Rate (L/s)* Drawdown Easting Northing Volume Drawdown and Wetlands) (m)^ 1114 Condition (kL) 6-1

Bore 1 Existing 53,567 344,889 N/A Superficial N/A N/A 70,000 245,000 2.2 1 m Up to 30 m >1000 Nil**

Bore 2 Existing 53,531 348,369 43.7 Superficial 55 10 - 52 95,000 332,500 3.0 1 m Up to 30 m 425 Nil**

Bore 3 Proposed 54,667 348,218 TBD Superficial TBD TBD 95,000 332,500 3.0 1 m Up to 30 m 70 Banksia Woodland

Bore 4 Proposed 57,578 349,539 TBD Leederville TBD TBD 49,500 173,250 1.6 1 m Up to 30 m 100 Nil**

Bore 5 Proposed 58,379 350,060 TBD Superficial TBD TBD 245,000 3.0 1 m Up to 30 m 375 Banksia 70,000 Woodland

Bore 6 Proposed 62,756 352,992 TBD Superficial TBD TBD 95,000 332,500 2.2 1 m Up to 30 m 230 UFI 7499

TBD = To be determined, N/A = Not Available * Pumping rates averaged over a 24- hour period and are based on 20 hours of pumping per day. Pumping rate could be higher but for fewer hours per day.^ Refer to Table 7 for distance to all nearby impacted areas

#All ‘Banksia woodland’ referred in this EMP is the Priority 3(i) Ecological Community Low lying Banksia attenuata woodlands or shrublands (‘floristic community type 21c’).

**Based on the distance of the Banksia Woodland being outside the radius of influence of the production bore and/or extraction from the Leederville aquifer.

1 Project duration estimated at 3.5 years

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Table 3 indicates that groundwater abstraction from Bore 1 and Bore 2 is not expected to have any direct or indirect impacts to the hydrological regimes that support the environmental values identified in condition 6 of MS1114, due to: ▪ Low average pumping rate (up to 3.0 L/s); ▪ Non-continuous pumping (up to 20 hours per day) and various durations throughout the year depending on construction/fill schedule and seasonable conditions; and

▪ Far distance from the nearest sensitive receptors (e.g. minimum 425 m from the nearest Banksia woodland to Bore 2) with negligible drawdown impact on the wetlands and Banksia woodland. Groundwater abstraction from Bore 4 is also unlikely to have any impact to the Superficial Aquifer and associated hydrological regimes identified in condition 6 of MS1114, as it will be drilled and installed within the deeper Leederville Aquifer and with limited connectivity to the Superficial Aquifer. Should the drilling and installation of Bore 4 within the Leederville Aquifer determine that there is a hydraulic connection between the Leederville and Superficial aquifers, then this EMP will be revised and updated accordingly.

Based on the above, groundwater abstraction from Bore 1, Bore 2 and Bore 4 is not subject to condition 6 of MS1114 and has not been covered by this EMP. Groundwater abstraction from Bore 3, Bore 5 and Bore 6 may potentially impact the hydrological regimes that support the environmental values identified in condition 6 of MS1114 due to their close proximity to the environmental values (Table 3) and therefore have been addressed in this EMP.

1.3 CONDITION REQUIREMENTS This condition EMP is submitted in accordance with MS 1114 condition 6-1, which requires the Proponent to manage and minimise impacts to the hydrological regimes that support specific environmental values through the implementation of the following conditions detailed in Table 4.

As required under condition 5-1, this plan will be made publicly available for the life of the proposal. This condition EMP will be made available on the Proponent’s website (https://www.metronet.wa.gov.au/projects/thornlie-cockburn-link#project-documents) once it has been approved by the CEO. Any ongoing updates to this plan will be published as the updates are approved by the CEO.

Table 4: Condition Requirements and In-Plan Section References

Condition Relevant Section

6-1 In the event that groundwater abstraction and/or dewatering activities are This EMP required, prior to the commencement of those activities, the proponent shall prepare and submit an Environmental Management Plan to the CEO with the objective of minimising impacts to the hydrological regimes that support the following environmental values: (1) Threatened Ecological Community Claypans of the Swan Coastal Plain identified by UFI 13365 (Brixton Street Wetlands). (2) Priority 3(i) Ecological Community Low lying Banksia attenuata woodlands or shrublands (‘floristic community type 21c’) outside the development envelope.

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Condition Relevant Section (3) Conservation Category and Resource Enhancement Wetlands (UFI 6912, UFI 6910, UFI 7446, UFI 14900, UFI 15925, UFI 6776, UFI 13332, UFI 7499, UFI 7447 and UFI 15926) outside the development envelope.

6-2 The Environmental Management Plan shall:

(1) Specify risk-based management actions for hydrological regimes that will Section 1.7.1 be implemented to demonstrate compliance with the environmental objective Section 2.3 specified in condition 6-1.

(2) Specify monitoring of hydrological regimes to measure the effectiveness Section 2.5 of management actions, including but not limited to, parameters to be measured, monitoring locations, and frequency and timing of monitoring.

(3) Specify a process for revision of management actions and changes to Section 2.6 proposal activities. The process shall include an investigation to determine Section 3 the cause of the management actions not being implemented.

(4) provide the format and timing to demonstrate that condition 6-1 has been Section 2.7 met for the reporting period in the Compliance Assessment Report required by condition 4-6 including, but not limited to: (a) verification of the implementation of management actions required by conditions 6-2(1) to 6-2(3); and (b) reporting on the effectiveness of management actions to meet condition 6-1.

(5) where relevant, prepare and submit the plan(s) in a staged approach for This EMP each station and areas subject to dewatering and groundwater abstraction.

6-3 Prior to the commencement of groundwater abstraction and/or Section 1.7 dewatering activities and after receiving notice in writing from the CEO that Also Refer to the the Environmental Management Plan, which the CEO has confirmed by Compliance notice in writing, satisfies the requirements of condition 6-2, the proponent Assessment Plan shall: for details relating (1) Implement the provisions of the approved Environmental Management to annual Plan; and compliance assessment (2) Continue to implement the Environmental Management Plan for at least reporting of twelve (12) months following the completion of groundwater abstraction implementation of and/or dewatering activities, or until the CEO has confirmed by notice in the condition writing that the proponent has demonstrated the objective specified in EMP. condition 6-1 has been met.

6-4 In the event that monitoring or investigations indicate that one or more Section 2.7.3 management actions specified in the Environmental Management Plan have not been implemented, the proponent shall: (1) report the failure to implement management action/s in writing to the CEO within seven (7) days of identification;

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Condition Relevant Section (2) investigate to determine the cause of the management action(s) not being implemented; (3) investigate to provide information for the CEO to determine if potential environmental harm or alteration of the environment occurred due to the failure to implement management actions; and (4) provide a report to the CEO within twenty-one (21) days of the reporting required by condition 6-4(1). The report shall include: (a) cause for failure to implement management actions; (b) the findings of the investigation required by conditions 6-4(2) and 6-4(3); (c) relevant changes to proposal activities; and (d) measures to prevent, control or abate any environmental harm which may have occurred.

6-5 The proponent: Section 3.2 (1) may review and revise the Environmental Management Plan; or (2) shall review and revise the Environmental Management Plan as and when directed by the CEO.

6-6 The proponent shall implement the latest revision of the Environmental Section 3.2 Management Plan, which the CEO has confirmed by notice in writing, satisfies the requirements of condition 6-2.

1.4 RATIONALE AND APPROACH This condition EMP addresses the key environmental factor (and relevant environmental outcomes and objectives) which were determined by the EPA as being relevant to the management of groundwater abstraction associated with the TCL project.

This condition EMP has been developed in accordance with the Instructions on how to prepare Environmental Protection Act 1986 Part IV environmental management plans (EPA 2020), to assist in minimising impacts associated with groundwater abstraction activities by ensuring impacts to hydrological regimes supporting a variety of environmental values as specified in condition 6-1 of the MS 1114 (Table 4) are minimised.

Prior to, and during the EPA referral and approvals process, environmental surveys and hydrogeological investigations were undertaken within and adjacent to the development envelope. Further to this, the Proponent engaged Golder Associates Pty Ltd (Golder) to commence a quarterly groundwater monitoring programme across the TCL alignment in February 2020 with additional monitoring conducted in March 2020. Limited environmental investigations have been undertaken to inform baseline levels from which management, monitoring and reporting provisions have been determined (where possible).

1.5 SURVEYS AND STUDY FINDINGS Key findings of hydrogeological investigations and assessments undertaken to date for the TCL project to determine the environmental values internal and external to the development envelope, are summarised below.

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1.5.1 PRELIMINARY HYDROGEOLOGICAL ASSESSMENT (GOLDER, 2019) The Proponent commissioned Golder to undertake a Preliminary Hydrogeological Assessment for the TCL project (Golder 2019). The objective of this assessment was to provide information on the sensitive groundwater dependent ecosystems in proximity to the project and present appropriate contingency and mitigation measures for implementation (if required to address potential impacts). A set of criteria were developed to assess the potential risk from dewatering and abstraction wells on the project.

1.5.1.1 Impact Assessment and Construction Water Requirements An assessment of the potential impacts to Inland Waters along the project alignment using three risk categories was undertaken, as summarised in Table 5.

Table 5: Assessment of Suitability of the Production Wells (Golder, 2019)

Colour Risk Criterion Percentage of Category risk category within the DE (%)

Red Groundwater abstraction wells are The groundwater level 27 not recommended to be located in cannot temporarily be these areas as there is an lowered by more than unacceptable risk of detrimental 0.3 m in wetland areas impacts to groundwater and/or and in existing draw environmental values from points. abstraction. This is predominantly based on the presence of public drinking water bores, conservation wetlands or Banksia woodlands within the vicinity of these areas.

Orange The risk of detrimental impacts to Groundwater level can 20 groundwater and/or environmental be lowered temporarily values from abstraction is between 0.1 m and 0.3 considered manageable through m in environmental additional investigations and by sensitive areas using trigger driven contingency (conservation and measures to manage the risk. resource enhancement wetlands).

Green The risk of detrimental impacts to Groundwater level 53 groundwater and/or environmental drawdown is lower than values from abstraction is 0.1 m in environmental considered acceptable (transient or sensitive areas negligible). (conservation and resource enhancement wetlands).

It was assessed that sufficient well locations along the project alignment exist where the risk of causing temporary, detrimental impact from abstracting groundwater was considered acceptable.

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The suitability of the selected production wells and the location of the proposed wells was assessed against the above risk assessment categories. The outcomes of the assessment are summarised in Table 6.

Table 6: Suitability of Production Wells Location

Location Aquifer Location Risk Potential Risk Coordinates Name within the Category to Well Status (PCG2020) Development (Golder, Environmental ID Envelope 2019) Values Easting Northing (Yes/No)

Bore 1 Existing 53,567 344,889 Superficial No Green Acceptable

Bore 2 Existing 53,531 348,369 Superficial No Green Acceptable

Bore 3 Proposed 54,667 348,218 Superficial Yes Green Acceptable

Bore 4 Proposed 57,578 349,539 Leederville Yes Red Unacceptable*

Bore 5 Proposed 58,379 350,060 Superficial Yes Green Acceptable

Bore 6 Proposed 62,756 352,992 Superficial Yes Green Acceptable *Note: As per the criterion listed in Table 5. The unacceptable risk to environmental values at Bore 4 was based on drawdown from the Superficial Aquifer and not the deeper Leederville Aquifer which it is intended to be installed in.

The assessment indicated that the temporary construction water requirements would be met through groundwater abstraction from the Superficial Aquifer. Bore 4 is located in an area identified as unacceptable due to its close proximity of the conservation wetlands and Banksia woodland. To overcome this, Bore 4 will be installed in to the deeper Leederville Aquifer, which is not connected to the Superficial Aquifer. It is therefore, anticipated that there is a low risk for potential groundwater drawdown and contamination to occur in the Superficial Aquifer and potential contamination and hydrological impacts to the nearby environmental values are minimised.

Further to the above, due to the relatively low pumping rates, short pumping duration, targeted aquifer and the large distance from sensitive receptors as detailed in Section 1.2.2, Bore 1, 2 and 4 are not expected to have direct or indirect impacts to hydrological regimes identified in condition 6 of MS1114 and therefore, have not been addressed in this EMP. Only Bore 3, 5 and 6 have been covered by this EMP.

1.5.2 GROUNDWATER MONITORING EVENT 1 (GOLDER, 2020A) The Proponent engaged Golder to undertake a quarterly groundwater monitoring programme for the TCL project. The first monitoring event was carried out between 10 and 14 February 2020, with additional monitoring conducted on the 16 March 2020. The quarterly groundwater monitoring is undertaken to provide groundwater quality data for the project which will be used to assess potential contamination within the project area and eventually allow for a Tier 1 assessment of human health and environmental risks. A total of thirty two (32) monitoring wells were sampled as part of the programme. Following the monitoring event it was reported that groundwater quality across the TCL alignment broadly corresponds to the findings of the TCL Detailed Site Investigation. Groundwater pH

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across the alignment is typically neutral and metals from this monitoring event were broadly consistent with previous monitoring data.

1.6 KEY ASSUMPTIONS AND UNCERTAINTIES The key limitations relating to the information used for this condition EMP include: ▪ The majority of the development envelope is a highly altered environment with a variety of land uses including railway reserve, residential properties, industrial properties and recreational areas. ▪ Groundwater abstraction in the proximity of a high to moderate Acid Sulfate Soil (ASS) risk area will be managed through site-specific ASS management plans in line with DWER ASS management guidelines and condition 9-1 of MS 1114. As such, monitoring and management requirements specific to ASS and groundwater abstraction are not presented in this plan. ▪ Groundwater abstraction in the Contaminated Site - Ranford Road Station will be managed through a site-specific contaminated site management plan in line with the National Environment Protection (Assessment of Site Contamination) Measure 1999 and DWER’s contaminated sites guidelines and condition 10-2 of MS 1114. As such, monitoring and management requirements specific to contaminated site and groundwater abstraction are not presented in this plan. ▪ Limited hydrogeological data for specific areas to assess the hydraulic connectivity between aquifers and possible impacts to vegetation. ▪ Limited understanding of the response of riparian vegetation to cumulative stressors such as groundwater abstraction and climate variability. ▪ Inherent difficulty in interpolating local groundwater table elevation from limited groundwater data to predict the groundwater dependence of riparian vegetation. ▪ Limited groundwater monitoring data for setting trigger and threshold criteria. Key uncertainties include: ▪ Final design and construction details of the TCL project were not known at the time of preparing this plan. Following final design, this plan may be revised in order to manage and target specific construction activities and locations within the proposal footprint.

1.7 MANAGEMENT APPROACH A risk-based approach has been taken through the Environmental Impact Assessment process to identify the key environmental values that may be impacted by implementation of the TCL project and warrant additional management. Regional data and site-specific monitoring data has been used to assess the potential impacts of the TCL project on environmental values (where available). The key impacts and risks identified as a result of groundwater abstraction during construction of the TCL project are summarised below.

1.7.1 KEY IMPACTS AND RISKS The Proponent has identified that the key impacts and risks as a result of groundwater abstraction during construction of the TCL project are potential impacts on key environmental values (e.g. Banksia woodland and Conservation Category and Resource Enhancement Wetlands).

The impact assessment undertaken as part of the preliminary hydrogeological assessment (Golder 2019) was utilised to identify acceptable production bore locations, assess sustainable pumping rates and identify impacts. Table 7 summarises the approximate distances from the existing and proposed production wells to the nearest identified potential impact areas. The nearest impact areas are shown in Figure 2 to 7. It is noted that all production wells are / will be located at a far enough distance from the TEC Claypans of the Swan Coastal Plain identified by UFI 13365 (Brixton Street Wetlands), and therefore no potential impacts will occur on this TEC.

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Table 7 also indicates that Bore 1 and Bore 2 are located relatively far from the environmental values with the nearest location of Banksia woodland at 425 m from Bore 2. Previous groundwater monitoring for Bore 2 indicated that the nearest Banksia woodland would at most be exposed to 0.21 drawdown, with the majority of the identified Banksia woodland exposed to between 0.2 m and 0.08 m drawdown for the worst-case scenario with average abstraction rate of 9.1 L/s for six months in summer (AECOM, 2017). In addition, Bore 1 and Bore 2 will have low average pumping rate of up to 3.0 L/s (Bore 2) and water abstraction is expected to be non-continuous pumping (up to 20 hours per day) with seasonal variations. Therefore, groundwater abstraction from Bore 1 and Bore 2 not expected to have any impacts to the hydrological regimes identified in condition 6 of MS1114 and have not been addressed in this EMP.

Although Bore 4 is located in the close proximity of the Banksia woodland and wetlands, groundwater abstraction from Bore 4 will also have no impacts to the hydrological regimes supporting environmental values identified in condition 6 of MS1114, given it will be drilled and installed within the deeper Leederville Aquifer and with limited connectivity to the Superficial Aquifer. Bore 4 has therefore, not been addressed in this EMP. Should the drilling and installation of Bore 4 within the Leederville Aquifer determine that there is a hydraulic connection between the Leederville and Superficial aquifers, then this EMP will be revised and updated accordingly.

Table 7: Bore Location Details and Distance to Nearest Potential Impact Area

Approximate Distance to Nearest Impact Area (m)

Water Well ID Banksia TEC Lots with Wetlands# Corporation Woodland (UFI 13365) ^ 5C Licence Well

Bore 1 >1000 >1000 >1000 >1000 220

Bore 2 425 765 >1000 >1000 60

Bore 3 70 >1000 >1000 >1000 260

Bore 4 100 100 >1000 >1000 360

Bore 5 375 560 >1000 >1000 10

Bore 6 >1000 230 >1000 >1000 10

# Conservation Category and Resource Enhancement Wetlands (UFI 6912, UFI 6910, UFI 14900, UFI 15925, UFI 6776, UFI 13332, UFI 7499, UFI 7447 and UFI 15926) ^ Threatened Ecological Community Claypans of the Swan Coastal Plain identified by UFI 13365 (Brixton Street Wetlands)

1.7.2 MANAGEMENT APPROACH Management measures to minimise the potential hydrological impacts are necessary to ensure the TCL project will not have a significant impact on the key environmental values. The management approach detailed in this condition EMP has been informed by best practice management and environmental and hydrogeological assessments undertaken by Golder (2019, 2020a).

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A hierarchy of management approaches have been used to minimise potential impacts to the key environmental factor (i.e. Inland Waters). Where impacts are unavoidable, management aims to minimise the duration, intensity and/or extent of impact on the key environmental factor during construction and during ongoing operation.

The Proponent proposes to ensure the existing production wells and construction water requirements will not have a significant impact to the hydrological regimes that support the environmental values listed in condition 6-1.

In accordance with condition 6-3, this plan will continue to be implemented until the CEO has advised that the environmental outcome has been met and the plan is no longer required to be implemented.

In accordance with condition 6-3(2), the monitoring required by condition 6-2(2) will be undertaken for a period of twelve (12) months following the completion of groundwater abstraction, or as otherwise agreed in writing by the CEO of DWER.

1.8 RATIONALE FOR CHOICE OF PROVISIONS Environmental criteria have been developed based on consideration of: ▪ Threatening processes and risk associated with the environmental value; ▪ The current state of knowledge for the environmental value; and ▪ The availability of suitable monitoring methods. The Proponent has established relevant monitoring reference sites within and outside of the development envelope to build upon the available groundwater level dataset, and to enable monitoring of potential impact to the relevant hydrological regimes.

The specific trigger and threshold criteria, management targets and actions have been developed as they provide a basis for detecting, avoiding and / or managing potential impacts such that the condition environmental outcomes and objectives stated in condition 6 of MS 1114 can be achieved.

The mitigation hierarchy is based on the objective of avoiding direct impacts and minimising impacts to the hydrological regimes. The management approach is informed by results from the limited groundwater data that is available (Golder 2019, 2020a, 2020b).

1.9 INDEX OF BIODIVERSITY SURVEYS FOR ASSESSMENTS (IBSA) The Index of Biodiversity Surveys for Assessments (IBSA) project is a mechanism by which all biodiversity survey information collected for environmental impact assessment under the EP Act will be captured and integrated into a consolidated, indexed and publicly available repository. IBSA is administered by DWER on behalf of itself, the EPA and the Department of Mines, Industry Regulation and Safety.

As there will be no biodiversity survey reports undertaken as part of this condition EMP, there will be no requirement to submit data to the IBSA submission portal.

2. ENVIRONMENTAL MANAGEMENT PLAN PROVISIONS This section identifies the legal provisions that the Proponent will implement to ensure that the environmental outcomes and management objectives of condition 6 are met during implementation of the TCL project.

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2.1 CONDITION REQUIREMENTS This condition EMP has been developed to address condition 6-1 of the MS 1114, as described in Table 8.

Table 8: Ministerial Statement 1114 Condition to Develop the EMP

Condition Clause Description

6-1 In the event that groundwater abstraction and/or dewatering activities are required, prior to the commencement of those activities, the proponent shall prepare and submit an Environmental Management Plan to the CEO with the objective of minimising impacts to the hydrological regimes that support the following environmental values: (1) Threatened Ecological Community Claypans of the Swan Coastal Plain identified by UFI 13365 (Brixton Street Wetlands). (2) Priority 3(i) Ecological Community Low lying Banksia attenuata woodlands or shrublands (‘floristic community type 21c’) outside the development envelope. (3) Conservation Category and Resource Enhancement Wetlands (UFI 6912, UFI 6910, UFI 7446, UFI 14900, UFI 15925, UFI 6776, UFI 13332, UFI 7499, UFI 7447 and UFI 15926) outside the development envelope.

2.2 OUTCOMES AND KEY ENVIRONMENTAL VALUES The outcome of this condition EMP is to identify the potential direct and indirect impacts on groundwater flows and develop management and monitoring measures that maximise the ongoing protection of the following key environmental values as specified in condition 6-1 of MS 1114: ▪ Threatened Ecological Community Claypans of the Swan Coastal Plain identified by UFI 13365 (Brixton Street Wetlands)1. ▪ Priority 3(i) Ecological Community Low lying Banksia attenuata woodlands or shrublands (‘floristic community type 21c’) outside the development envelope. ▪ Conservation Category and Resource Enhancement Wetlands (UFI 6912, UFI 6910, UFI 74462, UFI 14900, UFI 15925, UFI 6776, UFI 13332, UFI 7499, UFI 7447 and UFI 15926) outside the development envelope.

2.3 ENVIRONMENTAL CRITERIA Trigger criteria and threshold criteria for groundwater levels have been developed for Bore 3, Bore 5 and Bore 6 to meet the condition environmental outcomes as specified in Section 2.2. The trigger criteria were set at a conservative level to ensure trigger criteria actions are implemented in advance of the environmental outcome being potentially compromised. The threshold criteria were developed to measure achievement of the environmental outcome.

1 Threatened Ecological Community (TEC) Claypans of the Swan Coastal Plain identified by UFI 13365 (Brixton Street Wetlands) is not expected to be impacted by groundwater abstraction as all production bores are located far from this TEC (i.e. >1000 m). 2 Conservation Category and Resource Enhancement Wetlands UFI 7446 is located outside the radius of influence of all production bores covered in this EMP and thus is not addressed in this EMP.

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2.3.1 RATIONALE FOR SETTING THRESHOLD CRITERIA AND TRIGGER CRITERIA The selection of interim trigger and threshold criteria for groundwater levels have been developed for the proposed Bore 3, Bore 5 and Bore 6 with reference to the limited data available from the Groundwater Monitoring Event 1 (Golder, 2020a). Further to this, seasonal variation observed in the superficial aquifer has also been accounted for with regards to trigger levels as water levels are known to naturally fluctuate seasonally between 0.5 to 3.0 m in the underlying superficial aquifer (DoE, 2004). Due to lack of groundwater level baseline data, the interim threshold criteria for groundwater levels (Table 9) have been set to correspond to the initial groundwater level measurement minus 0.6 m (initial groundwater level will be recorded a minimum 7 days following installation to allow the aquifer to recharge and settle following construction). The 0.6 m threshold criterion is proposed to be applied because it is within the lower range of natural fluctuation observed from seasonal variation (0.5 to 3.0 m) (DoE, 2004).

The interim groundwater level threshold criteria aims to ensure that any drawdown created by abstraction activities does not exceed the range of seasonal variation in the water table (0.5 m to a maximum 3.0 m (DoE, 2004)). As the hydrological regimes may already be responsive to seasonal variation of 0.5 to 3.0 m during any year (without potential groundwater abstraction activities), the 0.6 m set for the threshold criteria is considered acceptable and an exceedance of 0.6 m is not expected to result in an unacceptable impact to the nearby sensitive receptors, which should not be significantly impacted if the groundwater levels are within the nominated levels. To provide adequate early warning of threshold criteria being approached, interim groundwater level trigger criteria are set to correspond to the initial groundwater level measurement minus 0.3 m in Bore 3, Bore 5 and Bore 6 (Table 9) (initial groundwater level will be recorded a minimum 7 days following installation to allow the aquifer to recharge and settle following construction. The 0.3 m criterion was chosen as a conservative approach, in response to the lack of available groundwater level data. Both the trigger and threshold criteria will be reviewed following every monitoring event undertaken until a baseline can be established (at least 4 monitoring events) and ongoing monitoring data becomes available. Exceeding threshold criteria signals the environmental outcome is not being met and therefore the threshold criteria contingency actions (refer to Section 2.6.2) will be implemented immediately to ensure compliance.

The interim threshold criteria and trigger criteria for groundwater levels for Bore 3, Bore 5 and Bore 6 are provided in Table 9.

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Table 9: Interim Groundwater Level Trigger Criteria and Threshold Criteria for Monitoring Wells Well ID Estimated Seasonal Interim Groundwater Interim Groundwater Minimum Groundwater Level Trigger Criteria Level Threshold Criteria Level

For Bore 3 (Karel Ave) – Superficial Aquifer

PBMW03 TBD* -0.3m from initial -0.6m from initial groundwater level groundwater level measurement* measurement*

For Bore 5 (Market City – CH8500) – Superficial Aquifer

PBMW05 TBD* -0.3m from initial -0.6m from initial groundwater level groundwater level measurement* measurement*

For Bore 6 (Thornlie – CH3000) – Superficial Aquifer

PBMW06 TBD* -0.3m from initial -0.6m from initial groundwater level groundwater level measurement* measurement*

* interim criteria to be determined a minimum 7 days following installation of the well to allow the aquifer to recharge and settle following construction. Criteria will be reviewed following every monitoring event undertaken until a baseline can be established (at least 4 monitoring events) and ongoing monitoring data becomes available.

The trigger level and threshold contingency actions that must be implemented in the case that the trigger criteria or threshold criteria are exceeded are detailed in Section 2.6.

2.4 MANAGEMENT OBJECTIVES AND ACTIONS Table 10 outlines the management objective, measurement and actions to mitigate the key impact identified in Section 1.7.1.

Table 10: Management of Key Impact

Key Impact Management Objective Measurement Management Actions

Groundwater level ▪ The proximity of Potential ▪ Ensure sufficient measurements in conservation wetlands and impacts on water supply is selected monitoring Banksia woodland to the key maintained by wells (refer to production wells have been environmental minimising Section 2.5.1) utilised to estimate the values groundwater level sustainable pumping rate. specified in drawdown in areas. ▪ Review groundwater Condition 6-1 ▪ Groundwater level monitoring data monthly of MS 1114 does not approach based on actual pumping the trigger criteria as rates and groundwater specified in Section monitoring (level) results. 2.3. ▪ Reduce pumping rates and ▪ Abstraction does not volumes at extraction points have detrimental if groundwater drawdown

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Key Impact Management Objective Measurement Management Actions

impact on level in the designated groundwater quality monitoring well exceeds the associated trigger criteria as specified in Table 9 in two consecutive monitoring rounds) 2.5 MONITORING

2.5.1 MONITORING LOCATIONS AND WELL DETAILS Groundwater monitoring will be undertaken to monitor potential impacts to the hydrological regimes that support the environmental values as specified in condition 6 of MS 1114. Monitoring of groundwater will be undertaken in the vicinity of Bore 3, Bore 5 and Bore 6 to determine whether the trigger and threshold criteria are being exceeded and ultimately, whether the condition environmental outcomes are being achieved. Only monthly groundwater abstraction volumes will be monitored and recorded at Bore 1, Bore 2 and Bore 4 as required the respective 5C license under the RIWI Act 1914.

Table 11 presents the monitoring well details for Bore 3, Bore 5 and Bore 6 and the distances between the monitoring well and nearest environmental values and other groundwater abstraction draw points. Figures 2 to 7 present the location of monitoring and production wells and nearest environmental values and other groundwater abstraction draw points.

Whilst impacts to Banksia woodland are not anticipated, the following reference points for photographic recording and monitoring of Banksia woodland have been established in the proximity of Bore 3 and Bore 5 respectively. A photo monitoring point for monitoring of the nearest Resource Enhancement Wetland (UFI 7499) has also been established for Bore 6. The locations of the photo monitoring points are shown in Figure 8 to Figure 10. A set of three (3) photographs, established from various directions from the photo monitoring points, will be taken of the Banksia woodlands, and UFI 7499 to allow progressive visual condition monitoring. The photographs are to be compared on a monthly basis, or more frequently if required.

The sites proposed as part of the groundwater and Banksia woodland and wetlands monitoring program will be used as the monitoring sites for this EMP throughout the life of the project, where possible. If a monitoring location becomes permanently damaged or inaccessible, a suitable alternative monitoring location will be established.

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Table 11: Monitoring Well Details

Location Coordinates * Distance to Distance to Other Nearest Distance to Elevation Production Groundwater 5C Environmental Nearest Well ID Aquifer (m AHD) Well (m) Licence Value Potentially Environmental Easting Northing Abstraction Draw Impacted Values (m) Points (m)

For Bore 3 (Karel Ave – PTA Land) – Superficial Aquifer

Banksia 25 PBMW03 Superficial 54619 348219 TBD 50 600 Woodland

For Bore 5 (Market City – CH8500) – Superficial Aquifer

Banksia 345 PBMW05 Superficial 58357 350015 TBD 55 445 Woodland

For Bore 6 (Thornlie – CH3000) – Superficial Aquifer

UFI 7499 200 PBMW06 Superficial 62817 353002 TBD 70 80

* Perth Coastal Grid 2020. Indicative locations only, as the monitoring wells have not been drilled yet and there might be some variation due to site conditions.

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2.5.2 MONITORING PROGRAM Table 12 and Monitoring will be undertaken to measure performance against the environmental outcomes and to assess the effectiveness of management actions in meeting the outcome-based objectives. Monitoring will inform when trigger or threshold contingency actions are to be implemented. A missed monitoring event will be treated as a potential non-compliance. The Proponent will be required to report the missed event to the CEO within seven (7) days of identification. The CEO will ultimately determine the outcome of the missed event. Monitoring and management measures will be implemented prior to the commencement of the groundwater abstraction activities and for a period of twelve (12) months following the completion of groundwater abstraction, or until the CEO of DWER has confirmed by notice in writing that the proponent has demonstrated the objective has been met.

2.5.3 MONITORING METHODOLOGY Groundwater monitoring will be undertaken in accordance with the following regulatory guidelines and standards: ▪ National Environment Protection (Assessment of Site Contamination) Measure 1999 (amended 2013), Schedule B2: Guideline on Data Collection, Sample Design and Reporting. ▪ Australian Standard AS 5667.11:1998 Water Quality-Sampling – Guidance on Sampling of Groundwater. The methods outlined are based on best practice and adherence to relevant guidelines.

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Table 13 summarise the proposed groundwater, Banksia woodland and wetland monitoring schedule, parameters and frequency including increased groundwater monitoring if exceedance of groundwater level trigger criteria and/or threshold criteria (Table 9) occurs. Monitoring of the groundwater level and condition monitoring of the Banksia woodland and wetlands will be undertaken at the same time (monthly), to coincide with the monthly monitoring event.

Table 12: Groundwater Level Monitoring Schedule

Site Parameter Frequency

Production Wells Water meter inspections and Monthly reading of abstracted volume

Monitoring Wells (PBMW03, Manual groundwater level Monthly PBMW05, PBMW06) measurement

Monitoring will be undertaken to measure performance against the environmental outcomes and to assess the effectiveness of management actions in meeting the outcome-based objectives. Monitoring will inform when trigger or threshold contingency actions are to be implemented. A missed monitoring event will be treated as a potential non-compliance. The Proponent will be required to report the missed event to the CEO within seven (7) days of identification. The CEO will ultimately determine the outcome of the missed event. Monitoring and management measures will be implemented prior to the commencement of the groundwater abstraction activities and for a period of twelve (12) months following the completion of groundwater abstraction, or until the CEO of DWER has confirmed by notice in writing that the proponent has demonstrated the objective has been met.

2.5.4 MONITORING METHODOLOGY Groundwater monitoring will be undertaken in accordance with the following regulatory guidelines and standards: ▪ National Environment Protection (Assessment of Site Contamination) Measure 1999 (amended 2013), Schedule B2: Guideline on Data Collection, Sample Design and Reporting. ▪ Australian Standard AS 5667.11:1998 Water Quality-Sampling – Guidance on Sampling of Groundwater. The methods outlined are based on best practice and adherence to relevant guidelines.

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Table 13: Banksia Woodland and Wetlands Monitoring Schedule

Site Coordinates Environmental Monitoring Parameter Frequency (PCG 2020) Value to be Monitored Easting Northing

54,590 348,201 Banksia woodland Photographical records (x3 Monthly (to be Bore 3 photo photographs) undertaken at monitoring same time as point– facing Photo compass bearing 1 – 270° (facing West) groundwater West Photo compass bearing 2 – 330° (facing Northwest) monitoring) Photo compass bearing 3 – 180° (facing South) Note: If 57,900 349,847 Banksia woodland Photographical records (x3 Bore 5 photo exceedances of photographs) monitoring the trigger and/or

point – threshold criteria Photo compass bearing 1 – 180° (facing South) facing are exceeded, Photo compass bearing 2 – 120° (facing Southeast) South photographs Photo compass bearing 3 – 240° (facing Southwest) should be collected in accordance with 62,966 353,203 Resource Photographical records (x3 increased Bore 6 photo Enhancement photographs) groundwater level monitoring Wetland (UFI monitoring. point – 7499) Photo compass bearing 1 – 30° (facing Northeast) facing West Photo compass bearing 2 – 210° (facing Southwest)

Photo compass bearing 3 – 300° (facing Northwest)

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2.6 CONTINGENCY ACTIONS The following contingency actions will be implemented if the monitoring described in the above sections identifies exceedances of trigger criteria and/or threshold criteria.

2.6.1 TRIGGER CRITERIA CONTINGENCY ACTIONS Trigger criteria contingency actions have been established and will be implemented immediately if the trigger criteria are exceeded. Trigger criteria actions aim to prevent an exceedance of threshold criteria. Trigger criteria actions will investigate the cause of exceedances and introduce measures to reduce the impact, including increasing the frequency of monitoring during high-risk activities or to determine if a trend is establishing. Table 14 sets out the contingency actions to be implemented if trigger criteria are exceeded. Table 14: Trigger Criteria Contingency Actions

Parameter Trigger Trigger Criteria Actions

Groundwater level Exceedance of water level 1. Confirm validity of result (i.e. review trigger criteria (refer to gauging procedures, review dataset). Table 9) 2. Remeasure affected monitoring location as soon as possible (within one day) to verify the result. 3. Notify the CEO of DWER in writing within 7 days of becoming aware of the exceedance. 4. Review hydrogeological information including results from nearby monitoring locations, and compare groundwater drawdown levels, where available. 5. Investigate cause of the exceedance using appropriate trend/statistical analyses and analysing current groundwater abstraction operations, including pump volumes and rates, where appropriate. 6. If results are assessed to be likely due to construction of the project, the groundwater abstraction rates and groundwater usage should be reviewed and revised (reduced) or abstraction ceased, as required. 7. Undertake additional gauging as soon as practicable following implementation of contingency actions and review the result. 8. Undertake additional photographic monitoring following implementation of contingency actions and review the results. 9. If both rounds of monitoring show trigger levels have been exceeded, review

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Parameter Trigger Trigger Criteria Actions

abstraction rates and volumes and determine suitable decrease in rates and/or volume (as required). 10. Identify and implement additional measures required to prevent the trigger criteria being exceeded and implement as required. 11. Provide a report to the CEO of DWER within 21 days from the date of awareness of the exceedance. 12. Document the trigger exceedance and additional photographs for inclusion in the annual Compliance Assessment Report.

2.6.2 THRESHOLD CRITERIA CONTINGENCY ACTIONS Threshold criteria represent the limit of acceptable impact beyond which there is potential to be a significant impact on the environment, indicating that an environmental outcome is not being met. Threshold criteria contingency actions have been developed and will be implemented immediately if threshold criteria are exceeded. The aim of threshold contingency actions is to prevent significant impact to the environment, ascertain the extent of impact and remediate or rectify the impact, as required. Initial investigations should determine probable causes and halt activities that may be contributing (as required). Table 15 sets out the contingency actions to be implemented if threshold criteria are exceeded.

Table 15: Threshold Criteria Contingency Actions

Parameter Trigger Threshold Criteria Actions

Groundwater level Exceedance of water level 1. Confirm validity of result (i.e. review threshold criteria (refer to gauging procedures). Table 9) 2. Cease groundwater abstraction activities immediately. 3. Notify the CEO of DWER in writing within 7 days of becoming aware of the exceedance. 4. Remeasure affected monitoring location as soon as possible (within one day) to verify the result. 5. Review hydrogeological information including results from nearby monitoring locations, and compare groundwater drawdown levels, where available. 6. Investigate cause of the exceedance by using appropriate trend/statistical analyses

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Parameter Trigger Threshold Criteria Actions

and undertaking a review of groundwater abstraction rates and volumes. 7. Dependant on the identified cause, determine and implement appropriate action i.e. continued lowering of abstraction rate and/or volume to allow for sufficient recharge (as required). 8. Continue monitoring including effectiveness of implemented changes to determine potential environmental harm or alteration of the environment. 9. Continue photographic monitoring following implementation of contingency actions and review the results. 10. Identify and implement any additional measures required to prevent the threshold level being exceeded in the future. This may include obtaining water from an alternative source if required to remain below threshold criteria. 11. Provide a report to the CEO of DWER within 21 days from the date of awareness of the exceedance. 12. Document the threshold exceedance for inclusion in the annual Compliance Assessment Report.

2.7 REPORTING

2.7.1 MONITORING REPORT A monthly environmental monitoring report will be prepared to summarise the results of monitoring during the reporting period (1st to 31st of each calendar month). These results will be provided in the annual Compliance Assessment Report.

2.7.2 ANNUAL COMPLIANCE ASSESSMENT Annual reporting of the management targets against the management objectives for Inland Waters will be detailed in an annual Compliance Assessment Report submitted the Proponent for each calendar year (1st January to 31st December), as required by condition 4-6 of MS 1114. The results of the monitoring undertaken for this condition EMP will be included in the appendices of the annual Compliance Assessment Report, including the following: ▪ Documentation of monitoring undertaken; ▪ Comparison of monitoring results against the trigger and threshold criteria and baseline data; ▪ Comparison of photographic records; ▪ Documentation of the effectiveness of the outcome based actions against trigger and threshold criteria; and

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▪ Management actions undertaken, including revised or additional actions.

2.7.3 REPORTING ON EXCEEDANCE OF TRIGGER AND/OR THRESHOLD CRITERIA In the event that monitoring indicates that management targets (trigger and/or threshold criteria) have been exceeded, the Proponent will report the exceedance to the CEO within seven (7) days of identification. Following the investigation, the Proponent will provide a report to the CEO within twenty-one (21) days of the initial report.

The report shall include: ▪ Trigger and/or threshold criteria that have been exceeded; ▪ Cause for management targets being exceeded; ▪ The findings of the investigation required to determine the cause of the management targets being exceeded; ▪ Information to determine if potential environmental harm or alteration of the environment occurred due to the failure to implement management actions; ▪ Trigger/threshold contingency actions (e.g. increased groundwater level monitoring and photo monitoring) that have been implemented; ▪ Details of the revised and/or additional management actions to be implemented to prevent exceedance(s) and/or to ensure achievement of the management target; ▪ Relevant changes to Project activities; and ▪ Measures to prevent, control or abate any environmental harm which may have occurred.

3. ADAPTIVE MANAGEMENT AND REVIEW OF THE EMP

3.1 ADAPTIVE MANAGEMENT The Proponent will implement adaptive management to learn from monitoring and evaluation against trigger and threshold criteria, monitoring and evaluation of progress against management targets and monitoring of the effectiveness of response actions, to more effectively meet the environmental outcomes and objectives. The following approach will apply: ▪ Monitoring data and photographs will be systematically evaluated and compared to baseline and reference site data (where available) on a regular basis in a process of adaptive management to verify whether responses to the impact are the same or similar to predictions. ▪ Evaluation of assumptions and uncertainties of the management and monitoring program. ▪ The effectiveness and relevance of trigger level and contingency actions will be evaluated on an annual basis to determine if any changes are required. ▪ The effectiveness and relevance of management actions will be evaluated on an annual basis to determine if any changes are required. Potential adaptive management actions may include, but are not limited to, the following: ▪ Exceedance of groundwater trigger or threshold levels (Table 9): • Determine/investigate cause/source. • Improve and implement additional trigger and threshold criteria contingency actions (Section 2.6) as required. • Monitor the success of management actions.

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3.2 REVIEW OF EMP This plan will be reviewed in accordance with condition 6-5 of MS 1114. Timing of the plan reviews include: ▪ As required – to determine if management, trigger and threshold criteria and contingency actions require review and revision. ▪ When directed by the CEO of DWER – in accordance with condition 6-5 (2) of MS 1114. ▪ Following completion of successive groundwater monitoring events – to evaluate trigger and threshold criterion with regards to seasonal variation. ▪ Following completion of abstraction activities – to evaluate the acceptability of the monitoring provisions for operation. ▪ In the event a project-attributable exceedance of a threshold criterion is recorded – to review and revise the plan, if required, by the findings of the monitoring report.

In relation to annual reviews in accordance with annual reporting, the potential reasons or triggers for revising the management, trigger and threshold levels and contingency actions include: ▪ Changes to construction and operation; ▪ Results of trend analysis in monitoring results; ▪ New or revised information becoming available on groundwater and surface water behaviour; ▪ Changes to State or Federal legislation; and ▪ Changes to regulatory framework. The latest version of this plan shall be implemented once the CEO of DWER has confirmed in writing that it satisfies the requirements of condition 6-2 of MS 1114. 4. STAKEHOLDER CONSULTATION Consistent with the EPA’s expectations for this condition EMP to align with the principles of Referral Information and Additional Information document, the Proponent has undertaken comprehensive stakeholder consultation as part of the broader referral and approvals process. The Proponent will continue to consult with relevant stakeholders and regulators in relation to this condition EMP and update it as required.

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5. REFERENCES AECOM Australia Pty Ltd (AECOM), (2017). Roe 8 Water Supply – H2 Assessment for Eastern Water Supply Bore, February 2017. Department of Water, (2009). Operational policy 5.12: Hydrogeological Reporting Associated with a Groundwater Licence, Department of Water, Perth. DoE (2004) Perth Groundwater Atlas (Online). Western Australian Department of Environment, Available at: https://maps.water.wa.gov.au/#/webmap/gwm. EPA (2019) Report and recommendations of the Environmental Protection Authority, Thornlie- Cockburn Link, Report 1646, August 2019. EPA (2020) Instructions on how to prepare Environmental Protection Act 1986 Part IV Environmental Management Plans, March 2020. Golder Associates (Golder), (2019). METRONET – Thornlie to Cockburn Link, Preliminary Hydrogeological Assessment. Golder reference 18104178-60-R-Rev0. Golder Associates Pty Ltd (2020a) PTA METRONET – Thornlie-Cockburn Link, Groundwater Monitoring Event 1, April 2020, Reference 19132627-003-R-Rev0-1. Golder Associates Pty Ltd (2020b) Thornlie-Cockburn Link, Groundwater Licence Operating Strategy, August 2020, Reference TCY-GOL-T00-GE-RPT-0044-Rev0.

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FIGURES

Groundwater Abstraction Environmental Management Plan – Thornlie-Cockburn Link W801032-TCL-NEW-EN-PLN-0009. Rev 1 Uncontrolled Document when Printed Page 34 of 44 52000 "X 54000 56000 58000 60000 62000 64000 66000 KARAWARAKARAWARA LEGEND BENTLEYBENTLEY (WA)(WA) CANNINGTON RAIL & BUS PROPOSED RAILWAY STATION COMO (WA) MANNING RD "X COMO (WA) INTERCHANGE "X EAST APPLECROSSAPPLECROSS EAST WATERFORD CANNINGTON RAILWAY STATION MANNINGMANNING CANNINGTON "X (WA)(WA) RAILWAY ALIGNMENT CANNINGTONCANNINGTON

356000 PROPOSED CONSTRUCTION WATER SUPPLY WELL WILSON .!

SALTERSALTER POINTPOINT MOUNTMOUNT PLEASANTPLEASANT CH 0 ARDROSSARDROSS (WA)(WA) BECKENHAMBECKENHAM ALB ANY HW SHELLEYSHELLEY (WA)(WA) Y KENWICKKENWICK FERNDALEFERNDALE (WA)(WA)

CH 1000 BOORAGOON RIVERTONRIVERTON (WA)(WA) BUS STATION "X 354000 HIGH RD LANGFORD BOORAGOON LANGFORD BOORAGOON ROSSMOYNEROSSMOYNE LYNWOODLYNWOOD (WA)(WA) CH 2000 Bore 6 BRENTWOODBRENTWOOD BULL CREEK (WA)(WA) (Thornlie - RAIL & BUS LEACH HWY CANNING INTERCHANGE CH3000) RIVER "X .!"X BRIDGE PARKWOOD (WA) PARKWOOD (WA) THORNLIE RAIL CH 3000 & BUS INTERCHANGE MADDINGTONMADDINGTON WINTHROP

Y WILLETTON CH 4000 BATEMANBATEMAN W OE HWY F R BULLBULL

A 352000 CREEK N CREEK A (WA)(WA) N I NICHOLSON

K RD STN "X CH 5000 THORNLIETHORNLIE

MURDOCH RAIL & V A

BUS INTERCHANGE L E "X R SOUTH ST A CH 6000 K Bore 5 MURDOCHMURDOCH (Market City

CH 7000 - CH8500) MIDLAND MOUNT HELENA RANFORD CH 8000 350000 RD STN ! . APPROXIMATE CH 9000 PERTH LEEMINGLEEMING "X VIEW EXTENT

CH 10000 .! FREMANTLE Bore RA 4 (Ranford NF CH 11000 O NORTH LAKE R NORTH LAKE D HUNTINGDALE ARMADALE Road) R HUNTINGDALE D (WA)(WA) GOSNELLSGOSNELLS BYFORD Bore 3 (Karel CH 12000 KWINANA Bore 2 (Roe Ave - PTA land) Hwy/Fwy) ROCKINGHAM .! KAREL CANNING VALE .!AVENUE CANNING VALE 0 7.5 15 CH 13000 JARRAHDALE BRIDGE GLEN SERPENTINE

348000 BIBRA LAKE BIBRA LAKE IRIS Kilometres CUT CH 14000 NOT FOR CONSTRUCTION 0 1 2 WARTON RD DRAFT NICHOLSON RD 1:50,000 KILOMETRES NOTE: 1. COORDINATE SYSTEM: GDA2020 PCG2020 CH 15000 2. SECTION A TAKEN ALONG THE PROPOSED PASSENGER DOWN MAIN JANDAKOTJANDAKOT 3. CHAINAGES SHOWN AS PASSENGER DOWN MAIN

REFERENCES: SOUTHERNSOUTHERN 1. RAILWAY STATIONS, RAILWAY LINES, CADASTRE AND ROADS © WESTERN AUSTRALIAN RIVERRIVER LAND INFORMATION AUTHORITY TRADING AS LANDGATE (2019) SOUTH LAKE SOUTH LAKE 2. AERIAL IMAGE SOURCED FROM NEARMAP (2018-06-24) 3. RAILWAY ALIGNMENT PROVIDED BY CLIENT (2019-01-08) 346000 CH 16000 CLIENT PUBLIC TRANSPORT AUTHORITY

PROJECT Bore METRONET - THORNLIE TO COCKBURN LINK (TCL) HARRISDALEHARRISDALE YANGEBUPYANGEBUP 1 (Kwinana CH 17000 Fwy) .! TITLE COCKBURNCOCKBURN CENTRALCENTRAL BANJUPBANJUP Figure 1 - Location Plan

COCKBURN CENTRAL CH 17550 IF THISMEASUREMENT DOES NOTMATCH WHAT ISSHOWN, THE SHEET SIZE HAS BEEN MODIFIED FROM: A3ISO RAIL & BUS CONSULTANT YYYY-MM-DD 2020-09-08 INTERCHANGE "X 25mm FORRESTDALEFORRESTDALE CHAMPIONCHAMPION DESIGNED DAK LAKESLAKES 344000 PIARAPIARA WATERSWATERS PREPARED JRP

MUNSTERMUNSTER REVIEWED SUCCESSSUCCESS ATWELLATWELL SEVILLESEVILLE APPROVED GROVEGROVE DOCUMENT W801032-TCY-NEW-EN-PLN-0004

PATH: C:\Users\alundorf\GolderPATH: Associates\1788274, NEWestAlliance Metronet - ProjectFiles\5 Technical Work\02 Water\GIS\W801032-TCY-NEW-EN-PLN-0004-F001.mxd PRINTEDON: 2020-09-08 7:20:46AT: PM 52000 54000 56000 58000 60000 62000 64000 66000 0 Bore 1 (Kwinana Fwy)

PBMB01

Cockburn Central Rail & Bus Interchange

TCL Development Envelope Image courtesy of T2T Project DISCLAIMER Proposed Construction Water Supply Well This map is a user generated Proposed Monitoring Well Scale 1: 6,000 static output from EIC Activities Web GIS Viewer and is for reference only. Data layers that appear on 0 0.2 0.4 this map may or may not be accurate, current, or Kilometers otherwise reliable.

Status GISGISGIS OUTPUTOUTPUTOUTPUT NOT USED FOR CONSTRUCTION Metronet

Original Drawn Size Web GIS Figure 2 - Bore 1 (Kwinana Fwy) A3 Coordinate Designed Existing Water Supply Well (Superficial Aquifer) System PCG2020 MC

Height Date Printed Datum AHD 2-Nov-2020 Legend

TCL Development Envelope PEC Banksia Woodlands Proposed Construction Water Supply Well Proposed Monitoring Well

Bore 2 (Roe Hwy/Fwy)

MB1 (Roe)

Status GISGISGIS OUTPUTOUTPUTOUTPUT A FOR INFORMATION DISCLAIMER NOT USED FOR CONSTRUCTION MetronetMetronetMetronetMetronet This map is a user generated static output from EIC Issue Description Date Approved Original Drawn Activities Web GIS Viewer and is for reference only. Size A3 MC 30/10/2020 MC Data layers that appear on this map may or may not Figure 3 - Bore 2 (Roe Hwy) be accurate, current, or otherwise reliable. Coordinate Designed System MC PCG2020 Existing Water Supply Well (Superficial Aquifer) 0.1 Height Date Printed 0 0 Datum AHD 30-Oct-2020 Scale 1: 5,000 .2

TCL Development Envelope

PEC Banksia Woodlands Proposed Construction Water Supply Well Proposed Monitoring Well Groundwater Licence Abstraction Draw Point

PBM W03

Bore 3 (Karel Ave )

Status GISGISGIS OUTPUT A FOR INFORMATION DISCLAIMER NOT USED FOR CONSTRUCTION Metronet This map is a user generated static output from EIC Issue Description Date Approved Original Drawn Activities Web GIS Viewer and is for reference only . Size A3 MC 2/11/2020 MC Data layers that appear on this map may or may not Figure 4 - Bore 3 (Karel Avenue) be accurate, current, or otherwise reliable. Coordinate Designed

System PCG2020 MC Proposed Water Supply Well (Superficial Aquifer)

0.1 Height Date Printed 0 0.2 Datum AHD 2-Nov-2020 Scale 1: 5,000

Legend

TCL Development Envelope PEC Banksia Woodlands Geo Wetlands Swan Coastal Plain Conservation

Multiple Use Resource

Enhancement Proposed Construction Water Supply Proposed Monitoring Well Groundwater Licence Abstraction Draw Point

Bore 4 (Ranford Road )

PBMB04

Status GISGISGIS OUTPUT A FOR INFORMATION DISCLAIMER NOT USED FOR CONSTRUCTION Metronet This map is a user generated static output from EIC Issue Description Date Approved Original Drawn Activities Web GIS Viewer and is for reference only . Size A3 MC 2/11/2020 MC Data layers that appear on this map may or may not Figure 5 - Bore 4 (Ranford Road) be accurate, current, or otherwise reliable. Coordinate Designed

System MC Proposed Water Supply Well (Leederville Aquifer) PCG2020 0.1 Height Date Printed 0 0.2 Datum AHD 2-Nov-2020 Scale 1: 3,000

Legend

TCL Development Envelope PEC Banksia Woodlands Geo Wetlands Swan Coastal Plain Conservation

Multiple Use Resource

Enhancement

Proposed Construction Water Supply Well Proposed Monitoring Well Groundwater Licence Abstraction Draw Point

Bore 5 (Market City)

PBMW05

Status GIS OUTPUT A FOR INFORMATION DISCLAIMER NOT USED FOR CONSTRUCTION Metronet This map is a user generated static output from EIC Issue Description Date Approved Original Drawn Activities Web GIS Viewer and is for reference only. Size A3 2/11/2020 MC Data layers that appear on this map may or may not MC Figure 6 - Bore 5 (Market City) be accurate, current, or otherwise reliable. Coordinate Designed

System PCG2020 MC Proposed Water Supply Well (Superficial Aquifer)

Legend

TCL Development Envelope PEC Banksia Woodlands Geo Wetlands Swan Coastal Plain Conservation

Multiple Use

Resource Enhancement

Proposed Construction Water Supply Well Proposed Monitoring Well Groundwater Licence Abstraction Draw Point

Bore 6 (Thornlie)

PBMW06

Thornlie Rail & Bus Interchange

Status GIS OUTPUT A FOR INFORMATION DISCLAIMER NOT USED FOR CONSTRUCTION Metronet This map is a user generated static output from EIC Issue Description Date Approved Original Drawn Activities Web GIS Viewer and is for reference only. Size A3 MC 2/11/2020 MC Data layers that appear on this map may or may not Figure 7 - Bore 6 (Thornlie) be accurate, current, or otherwise reliable. Coordinate Designed

System PCG2020 MC Proposed Water Supply Well (Superficial Aquifer)

Legend

TCL Development Envelope PEC Banksia Woodlands Photo Monitoring Location

Photo Monitoring Facing Direction

Status GISGISGIS OUTPUT A FOR INFORMATION DISCLAIMER NOT USED FOR CONSTRUCTION This map is a user generated static output from EIC Issue Description Date Approved Original Drawn Metronet Activities Web GIS Viewer and is for reference only . Size A3 MC 03/11/2020 MC Data layers that appear on this map may or may not be accurate, current, or otherwise reliable. Coordinate Designed Figure 8 - Proposed Bore 3

System PCG2020 MC Photo Monitoring Location 0.02 Height Date Printed Datum AHD Scale 1: 800 0 0.04 3-Nov-2020

Legend

TCL Development Envelope PEC Banksia Woodlands Geo Wetlands Swan Coastal Plain Conservation

Multiple Use Resource Enhancement Photo Monitoring Location

Photo Monitoring Facing Direction

Status GISGISGIS OUTPUT A FOR INFORMATION DISCLAIMER NOT USED FOR CONSTRUCTION This map is a user generated static output from EIC Metronet Issue Description Date Approved Original Drawn Activities Web GIS Viewer and is for reference only . Size A3 MC 03/11/2020 MC Data layers that appear on this map may or may not Figure 9 - Proposed Bore 5 be accurate, current, or otherwise reliable. Coordinate Designed

System PCG2020 MC Photo Monitoring Location

0.02 Height Date Printed 0 0.04 Datum AHD 3-Nov-2020 Scale 1: 800

Legend TCL Development Envelope Geo Wetlands Swan Coastal (Resource Enhancement)

Photo Monitoring Location

Photo Monitoring Facing Direction

UFI 7499

Status GISGISGIS OUTPUT A FOR INFORMATION DISCLAIMER NOT USED FOR CONSTRUCTION This map is a user generated static output from EIC Metronet Issue Description Date Approved Original Drawn Activities Web GIS Viewer and is for reference only . Size A3 MC 3/11/2020 MC Data layers that appear on this map may or may not Figure 10 - Proposed Bore 6 be accurate, current, or otherwise reliable. Coordinate Designed

System PCG2020 MC Photo Monitoring Location

0.02 Height Date Printed 0 0 Datum AHD 3-Nov-2020 Scale 1: 800