Roe Highway Extension Wetlands Monitoring and Management Plan · Roe Highway Extension MRO15099_05 R001 Rev 5 30-Nov-16 Table of contents Summary i 1. Context, scope and rationale

Roe Highway Extension Wetlands Monitoring and Management Plan

November 2016

Roe Highway Extension. Wetlands Monitoring and Management Plan – Ministerial Statement 1008


Document No: D16#681813

Prepared for Main Roads Western Australia by Strategen

November 2016


Roe Highway Extension

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Table of contents

Summary i

1. Context, scope and rationale 1

1.1 Context 1 1.1.1 Project description 1 1.1.2 Project activities 1 1.1.3 Wetlands 2 1.1.4 Regard for Ramsar Wetlands within the broader Beeliar Wetlands 2

1.2 Scope 5 1.2.1 Key environmental factors and aspects 5 1.2.2 Requirements of the condition 5

1.3 Rationale and approach 6 1.3.1 Baseline Wetland Condition Survey 6 1.3.2 Management approach 6 1.3.3 Trigger value determination 7 1.3.4 Trigger range determination 7 1.3.5 Trigger value review and revision 7

2. Monitoring program 9

2.1 Methodology 9

2.2 Monitoring locations 9

2.3 Frequency 9

2.4 Additional Sampling 10

3. Management 20

3.1 Contingency measures 20

4. Review and reporting 22

4.1 Review and revision 22

4.2 Reporting 22

4.3 Auditing 22

4.4 Consultation 22

5. References 24

List of tables

Table 1: Wetlands within the development envelope 2

Table 2: Key environmental factors, objectives and environmental aspects 5

Table 3: Condition requirements under Statement 1008 5

Table 4: Wetland quality monitoring program and trigger values– surface water 11

Table 5: Wetland quality monitoring program and trigger values- Groundwater 14

Table 6: Wetland quality monitoring plan and trigger values - sediment 16

Table 7: Contingency measures 20

Table 8: Stakeholder consultation 22

List of figures

Figure 1: Project development envelope 4

Figure 2: Beeliar Wetlands system 8

Figure 3: Wetland surface water and sediment monitoring locations 17

Figure 4: Groundwater monitoring locations 18

Figure 5: Wetland surface water monitoring locations (for aquatic macro-invertebrate survey) 19


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List of appendices

Appendix 1 Wetland quality monitoring methodology

Appendix 2 Monitoring locations


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Summary

Item Description

Title of the proposal

Roe Highway Extension Wetlands Monitoring and Management Plan.

Proponent name

Main Roads Western Australia.

Ministerial Statement Number

1008.

Purpose To ensure that impacts to wetland quality associated with the implementation of the proposal are minimised through implementation of conditions 9-2 to 9-9.

Trigger criteria

Refer to Table 4, Table 5 and Table 6.

Location of monitoring

Refer to Figure 3, Figure 4 and Figure 5 for sediment, groundwater, surface water and

macroinvertebrate monitoring locations. Co-ordinates of these monitoring locations are provided in

Appendix 2.

Frequency of monitoring

• surface and groundwater quality:

* field monitoring – fortnightly during construction and quarterly post-construction

* laboratory analysis – monthly during construction and quarterly post-construction

• sediment quality:

* annually during construction and operation.

• macroinvertebrates:

* annually during construction and operation.

Contingency actions

In the event monitoring indicates that the trigger criteria specified in Table 4, Table 5 and Table 6 have been exceeded, the following actions will occur:

• immediately implement management and/or contingency actions specified in Table 7

* continue to implement actions until trigger criteria is met or until CEO of OEPA confirms in writing that actions are no longer required

• investigate the cause of the trigger being exceeded and identify any further contingency actions required to prevent trigger criteria from being exceeded in the future

• provide a report to the CEO of the OEPA within seven days of a trigger criteria being exceeded. The report shall include:

* details of management and/or contingency actions implemented

* findings of the investigation conducted.

Signature of authorised proponent representative


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1. Context, scope and rationale

This document presents the wetland health monitoring and management actions to manage the potential

impacts of the Project on wetland health.

1.1 Context

1.1.1 Project description

Main Roads Western Australia (Main Roads) proposes to construct the Roe Highway Extension (the

Project, Figure 1) as part of the Perth Freight Link Project. The Project involves the construction of

approximately 5 km of highway, extending Roe Highway from its current terminus at the Kwinana Freeway

in Jandakot to Stock Road in Coolbellup.

The Project is located approximately 14 km south of Perth within the Swan Coastal Plain Bioregion. The

Project is largely contained within the City of Cockburn, however, parts of the design extend northward in

to the City of Melville along Murdoch Drive and Kwinana Freeway. Generally, the proposed Project is

oriented east-west largely, within a road reserve that was set aside in the Metropolitan Region Scheme

(MRS) in 1963. The alignment is between North and Bibra Lakes, which are part of the Eastern Chain of

the Beeliar Wetlands.

The Project will consist of a dual carriageway with two lanes in each direction, separated by a concrete

barrier in place of a median strip. The preferred design was selected following an extensive options

analysis and consultative process. Once selected, the preferred design was optimised to avoid and

minimise environmental impacts to the maximum extent possible. The Project was approved by the

Minister for Environment in 2 July 2015, with the release of Ministerial Statement 1008 (Statement 1008)

establishing conditions for the Project implementation.

1.1.2 Project activities

Construction of the Project is described in the PER (South Metro Connect 2011) as requiring the following

key activities:

• construction of road formation and associated infrastructure including, road drainage basins,

principal Shared Paths (pedestrian and cycle paths), retaining walls, fauna underpasses and

culverts, bridges and overpasses and noise attenuation walls

• installation of street and PSP lighting

• realignment of a short section of Murdoch Drain

• rehabilitation of areas disturbed for construction.

Operation of the proposed Project will result in the following key activities:

• freight transport

• private and commercial vehicle movements

• operation of street lighting

• maintenance.


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1.1.3 Wetlands

The alignment of the proposed Roe Highway Extension intersects the eastern chain of the Beeliar

Wetlands within Beeliar Regional Park (Figure 2). The eastern chain of Beeliar Wetlands encompasses

North Lake, Bibra Lake, South Lake, Little Rush Lake, Yangebup Lake, Kogolup Lake, Thomsons Lake,

Banganup Lake, Blue Gum Lake, Booragoon Lake, Piney Lakes, and the Spectacles (Figure 2).

Thomsons Lake is considered a Ramsar wetland which is recognised as a Matter of National

Environmental Significance under the EPBC Act.

The wetlands that will be directly impacted by the proposed Project include Bibra Lake, Horse Paddock

Swamp and Roe Swamp (includes Lower Swamp, Melaleuca Swamp, and surrounding sumplands). The

direct impacts to these wetlands are described in Table 1. No other Beeliar wetlands or Ramsar sites are

expected to be impacted by this Project.

Table 1: Wetlands within the development envelope

Wetland Management Category/Protection Total Area of Wetland (ha)

Area to be cleared/ developed (ha)

Bibra Lake Environmental Protection (Swan Coastal Plain Lakes) Policy 1992 (Lakes EPP)

138 0.95

Horse Paddock Swamp Conservation Category Wetland’s (CCW) in the Geomorphic Wetlands of the Swan Coastal Plain

3.2 0.2

Roe Swamp (incl Lower Swamp, Melaleuca Swamp & surrounding sumplands)

CCW in the Geomorphic Wetlands of the Swan Coastal Plain

53.7 5.6

Source: South Metro Connect 2013

Bibra Lake (Unique Feature Identifier (UFI) 6595 and 6522) has multiple UFIs, is classified as a Resource

Enhancement Wetland sumpland (REW). Bibra Lake is also protected under the Lakes EPP (DEC 2009).

The Lake and surrounding vegetation also forms part of Bush Forever Site 244. Bibra Lake is the largest

lake located within the development envelope and consists of permanent open water, which is a reflection

of groundwater on the western side of the Jandakot Mound (AECOM 2011). Bibra Lake has relatively

impermeable lake deposits, with sandy shores restricted to a small area to the west. As a consequence,

groundwater inflow and outflow is restricted when the water level drops (EPA and Water Authority of

Western Australia 1990).

North Lake (UFI 6599) is classified as a CCW and is protected under the Lakes EPP. North Lake is a

surface expression of groundwater of the western Jandakot groundwater mound. Groundwater flows into

the lake from the southeast and out to the northwest (DoW 2015). Surface water levels and pH have

declined and the lake is at risk of acidification. Nutrient concentrations at North Lake exceed ANZECC

guidelines for lakes and wetlands in southwest Western Australia (DoW 2015).

Roe Swamp (UFIs 15240, 14425 and 14645) is a group of seasonally inundated wetlands, located to the

east of North Lake. Roe Swamp is considered unique, diverse and of high fauna habitat value relative to

other wetlands in the Perth region and is accordingly classified as a CCW (AECOM, 2011). The majority

of Roe Swamp (with the exception of the eastern section) is also located within Bush Forever Site 244,

which describes the wetland vegetation as being equivalent to the Bassendean Complex. The northern

portion of Roe Swamp (UFI 14645) (Lower Swamp) is protected under the Lakes EPP (AECOM, 2011).

1.1.4 Regard for Ramsar Wetlands within the broader Beeliar Wetlands

Thomsons Lake is a RAMSAR listed wetland located on the western edge of the Jandakot

Groundwater Mound and forms part of the eastern chain of Beeliar wetlands that runs parallel to

the coast. Thomsons Lake is an interdunal groundwater wetland, which is almost exclusively

groundwater fed, with almost no surface water infiltration.


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To the north, Thomsons Lake is bordered by Kogolup Lake and surrounding bushland and to

the south, it is bordered by Banganup Lake and surrounding bushland. Thomsons Lake and

Banganup Lake are bisected by Russell Road. To the east and west of Thomsons Lake lies

rural to semi-rural land uses and residential development.

Groundwater generally flows in a westerly direction into Thomsons Lake from the Jandakot

Mound. Since around 2002-2003, Thomsons Lake has experienced seasonal drying, which is

attributed to lower than average rainfall. As Thomsons Lake receives almost no surface water,

it is less vulnerable to contamination from surface water runoff than other wetlands in the

eastern chain of Beeliar wetlands.

Given Thomsons Lake is located more than 6.5 km south of the proposed works footprint, and

groundwater flows in a westerly direction, it is not expected that Thomsons Lake will be

impacted by this proposal.

Melaleuca Swamp

North Lake Lower Swamp(Frog Swamp)

Bibra Lake

Horse PaddockSwamp

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Figure 1: Project development envelopeLegend

Development envelopeProposed construction footprintWetlands

Path: Q:\Consult\2015\MRO\MRO15099\ArcMap_documents\MRO15099.05\R001\MRO15099_05 R001 Rev4 F001.mxdSource: Aerial image: Nearmaps 2016; Wetlands: DPaW 2015; All other data: Client 2015.

¹Author: DWhite

at A4

0 200 400 600 800 1,000Meters

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Note that positional errors may occur in some areasCoordinate System: GDA 1994 MGA Zone 50

Date: 24/10/2016 !

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EsperanceAlbany

KununurraPort Hedland

GeraldtonCarnarvon

Perth

Newman

Kalgoorlie

WESTERNAUSTRALIA

[email protected]


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1.2 Scope

Statement 1008 Condition 9 requires the proponent to prepare a Wetland Monitoring and Management

Plan (WMMP) to monitor the health and condition of Roe Swamp, North Lake and Bibra Lake and identify

management measures to be undertaken in the event that the Project impacts wetland health and/or

quality.

1.2.1 Key environmental factors and aspects

The key environmental factors, EPA objectives and environmental aspects of the Project relevant to the

factors are summarised in Table 2.

Table 2: Key environmental factors, objectives and environmental aspects

Factor EPA objective Environmental aspects of the Project

Inland Waters Environmental Quality

Maintain the quality of groundwater and surface water, sediment and biota so that the environmental values, both ecological and social, are protected.

• indirect impacts of construction activities, including changes to hydrological process and potential contamination

• ongoing impacts from road runoff during the operation.

1.2.2 Requirements of the condition

The WMMP has been prepared to address the requirements under condition 9 of Statement 1008 dated

2 July 2015, as outlined in Table 3.

Table 3: Condition requirements under Statement 1008

Condition Requirement Section

9-1 The proponent shall ensure that impacts to wetland quality associated with the implementation of the proposal are minimised, through implementation of conditions 9-2 to 9-9.

N/A

9-4 Prior to commencement of construction, the proponent shall prepare a Wetlands Monitoring and Management Plan to the requirements of the CEO, on advice from the Department of Parks and Wildlife and the Department of Water. The Wetlands Monitoring and Management Plan shall:

N/A

1. When implemented, substantiate whether condition 9-1 is being met; Section 2 & 3

2. Include the location of monitoring and reference sites; Section 2, Figure 3, Figure 4 and Figure 5

3. Include protocols for monitoring the indicators as identified under condition 9-2; Section 2 & Appendix 1

4. Determine the trigger levels for indicators of wetland quality to achieve the requirements of condition 9-1;

Section 1.3.3 and 2

5. Include protocols for monitoring wetland quality against the trigger levels identified in condition 9-4(4);

Section 2, 3 & Appendix 1

6. Identify management and contingency measures, including timeframes for their implementation, in the event that trigger levels identified under condition 9-4(4) are not met.

Section 3

9-5 Prior to commencement of construction, the proponent shall implement the approved Wetlands Monitoring and Management Plan, and continue implementation until otherwise agreed by the CEO.

N/A

9-6 The proponent may review and revise the Wetlands Monitoring and Management Plan to the requirements of the CEO.

Section 4

9-7 The proponent shall review and revise the Wetlands Monitoring and Management Plan as and when directed by the CEO.

Section 4

9-8 The proponent shall implement the approved revisions of the Wetlands Monitoring and Management Plan required by conditions 9-6 and 9-7.

N/A


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Condition Requirement Section

9-9 In the event that the monitoring indicates that the trigger criteria specified in the Wetlands Monitoring and Management Plan have been exceeded the proponent shall:

1. immediately implement the management and/or contingency actions specified in the Wetlands Monitoring and Management Plan and continue implementation of those actions until the trigger criteria are being met, or until the CEO has confirmed by notice in writing that it has been demonstrated that the outcome in condition 9-1 is being and will continue to be met and implementation of the management and/or contingency actions is no longer required;

2. investigate to determine the likely cause of the trigger criteria being exceeded and to identify any additional contingency actions required to prevent the trigger criteria being exceeded in the future; and

3. provide a report to the CEO within seven days of an event, referred to in condition 9-9, occurring. The report shall include:

a. details of management and/or contingency actions implemented; and

b. the findings of the investigation required by condition 9-9(2).

Table 7 & Section 4.2

9-10 The proponent shall submit the monitoring results required by condition 9-4, referenced against the environmental quality objective specified in condition 9-1 and the trigger levels specified in condition 9-4(4), to the CEO as part of the annual compliance reporting required by condition 4.

Section 4.3

9-11 The Wetlands Monitoring and Management Plan required by condition 9-4 shall be made publicly available in a manner approved by the CEO.

N/A

1.3 Rationale and approach

1.3.1 Baseline Wetland Condition Survey

A Baseline Analysis Report (BAR) has been conducted from September 2015–August 2016

(Aurecon 2016) to inform localised trigger levels and ranges for local groundwater and surface water

systems associated with the Project. The results of the BAR have been incorporated into this WMMP to

inform low-risk trigger levels and ranges for ground and surface water parameters.

The ongoing monitoring program detailed in this WMMP will commence following the endorsement of this

WMMP. Data collected in this ongoing monitoring program may also be used to refine the trigger values

set in this WMMP.

1.3.2 Management approach

The approach for managing potential indirect impacts from the Project on wetland quality, is to implement

a comprehensive monitoring and contingency program that identifies, monitors and manages indicators of

wetland quality. This WMMP achieves this by defining trigger values for each indicator of wetland quality

to enable Main Roads to determine whether contingency measures are required to be implemented

(Section 3).

Indicator trigger values comprise of two data sets informed from:

• baseline data surveys associated with groundwater and surface water quality data (BAR,

Aurecon 2016)

• guideline values for wetland quality have been obtained using ANZECC & ARMCANZ (2000) and

DEC (2010) assessment level guidelines in Western Australia.

An exceedance of both the baseline and guideline trigger values will trigger the requirement to implement

contingency actions detailed in Section 3.1.

Note that not all parameters to be monitored have a trigger value (for example water levels/depths and

dissolved oxygen). These parameters are to be measured to provide information on the wider wetland and

groundwater system.


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1.3.3 Trigger value determination

Parameters for wetland quality have been chosen as they are independent indicators of wetland health,

and also have some measure of inter-dependency which will better inform when contingency actions are

required. Trigger values for these wetland quality parameters are required to be identified to monitor

potential impacts to wetland health as a result of the Project.

Baseline and guideline values for surface and groundwater parameters align with the BAR (Aurecon 2016)

and are consistent with the Australian and New Zealand Environment and Conservation Council

(ANZECC) 2000 guideline (ANZECC and ARMCANZ 2000) respectively. Sediment quality data was not

collected as part of the BAR, therefore guideline values for sediment quality parameters were derived

based on existing data (AECOM 2012) and DEC (2010) and ANZECC & ARMCANZ (2000) assessment

level guidelines for sediment in Western Australia.

1.3.4 Trigger range determination

For stressors that may cause problems at higher concentrations (e.g. nutrients or metals), the 80th

percentile of the baseline distribution data (Aurecon 2016) was taken to derive the “low-risk” trigger value,

whereas the 20th percentile is taken for stressors that may cause problems at low levels (e.g. dissolved

oxygen). If a range is needed (e.g. salinity, pH), then this is taken to be the range between the 80th

percentile and 20th percentile of the baseline data collected.

An exceedance of a 80th or 20th percentile baseline value or range does not necessarily cause for

concern. The purpose of the trigger levels and ranges is to establish an operational framework to allow

meaningful interpretation of water quality monitoring data over time once the activity of concern has

commenced.

1.3.5 Trigger value review and revision

Trigger values will be reviewed and revised if required based on relevant guidelines and available

monitoring data including:

• monthly targeted groundwater monitoring between March 2011 and April 2012 (AECOM 2012)

• monitoring water levels and ecological health as a condition of the approval of groundwater

abstraction from the Jandakot Groundwater Mound by DoW

• monitoring in Bibra Lake and North Lake as part of the City of Cockburn midge control program

(CALM 2006)

• a Perth shallow groundwater systems investigation for North Lake undertaken by Department of

Water (DoW 2015)

• the triggers for minimum water levels in Bibra and North Lakes set as part of the approvals for the

Jandakot Groundwater Scheme Stage 2 (Government of Western Australia 2005)

• monitoring data for this area from the Department of Water website and will be reviewed as part

of the baseline survey

• relevant macroinvertebrate monitoring data available from the Department of Water website for

reference site, such as Thomsons Lake, Lake Yangebup and Lake Kogolup, will be reviewed

• survey of aquatic macroinvertebrates (Phoenix Environmental Services, October 2010)

• baseline data to be collected through the baseline monitoring program which includes

groundwater quality, surface water quality and bio indicators (Strategen 2015)

• BAR undertaken by Aurecon (2016) to establish localised trigger levels and ranges for

contaminates of concern for local groundwater and surface water systems associated with the

Project

• ongoing monitoring data collected as detailed in this WMMP prior to construction commencing in

proximity to Beeliar Regional Park.

Any proposed amendments to the baseline and guideline values will be undertaken in accordance with

condition 9 and provided to the CEO of the OEPA for approval prior to implementation.

LegendDevelopment envelopeBeeliar Regional Park

Melaleuca SwampNorth LakeLower Swamp

(Frog Swamp)

RoeSwamp

Bibra Lake

Horse PaddockSwamp

Stock

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Lake

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na Fw

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South Lake

Little Rush Lake

Yangebup Lake

Kogolup Lake

Banganup Lake

Blue Gum Lake, Booragoon Lake and Piney Lakes (approx. 2 km)

The Spectacles(approx. 5 km)

Source: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX,Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS UserCommunity

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Path: Q:\Consult\2015\MRO\MRO15099\ArcMap_documents\MRO15099.05\R001\MRO15099_05 R001 Rev4 F002.mxd

Scale at A4

Source: Aerial image: ESRI, approx. 2010, Development envelope: Client 2015; Regional Parks: DPaW 2015.

Note that positional errors may occur in some areas

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Coordinate System: GDA 1994 MGA Zone 50

Date: 24/10/2016Author: DWhite

¹Figure 2: Beeliar Wetlands system

[email protected]


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2. Monitoring program

The purpose of monitoring is to inform, through the triggers, if the environmental objective is being

achieved and when contingency management actions will be have to be implemented, reviewed and

revised. This section describes how Main Roads will undertake monitoring to determine whether the

environmental objective is achieved.

The monitoring program will involve monitoring of wetland water quality and levels, sediment quality and

bio indicators in order to:

• determine if changes are occurring to these factors

• assess whether any changes are due to the Project or external/natural factors.

2.1 Methodology

The methodology and parameters for monitoring is consistent with the BAR (Aurecon 2016) to enable

accurate comparisons. The parameters have been divided into primary (key) parameters and secondary

parameters (Table 4, Table 5 and Table 6). Primary parameters will be more frequently monitored, with

secondary parameters being monitored less frequently or in response to specific incidents (e.g. a

significant spill).

Parameters and analytes for monitoring under this WMMP are listed in Table 4, Table 5 and Table 6.

The sampling methodology for surface water quality, groundwater quality, sediment analysis and

macroinvertebrate monitoring to is described in Appendix 1.

2.2 Monitoring locations

Monitoring locations for this WMMP are shown in Figure 3, Figure 4 and Figure 5. The co-ordinates of all

monitoring locations are provided in Appendix 2.

The monitoring sites are located around Roe Swamp, North Lake and Bibra Lake utilising sites from

baseline surveys. Aquatic macro-invertebrate surveys will utilise the same sampling locations as the 2009

surveys (Figure 5) as well additional reference sites (selected from other water bodies within the Beeliar

wetlands chain including Thomsons Lake, Lake Yangebup, Lake Kogolup and a swamp to be confirmed

based on seasonal water levels equivalent to target swamps).

2.3 Frequency

The monitoring program will commence prior to the commencement of construction and continue until

otherwise agreed by the CEO of OEPA.

Monitoring will generally occur at the following frequencies (unless otherwise specified in Table 4, Table 5

and Table 6.

Surface and groundwater monitoring:

• field monitoring – fortnightly during construction then quarterly post-construction

• monitoring requiring laboratory analysis – monthly during construction and then quarterly post-

construction.

Sediment and macroinvertebrate monitoring:

• annually during construction and post-construction.


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2.4 Additional Sampling

Additional sampling may be undertaken in those areas near the wetlands if required.


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Table 4: Wetland quality monitoring program and trigger values– surface water

Parameter Parameter/Analytes to be tested*

Trigger values and ranges

Timing/ frequency Baseline values (Aurecon 2016) Guideline values

Bibra Lake North Lake Frog Swamp Roe Drain Roe Swamp

Surface water monitoring - Primary parameters

Physiochemical properties

Water level/ water depth

No trigger level proposed Fortnightly during construction, then quarterly post-construction.

pH 7.5 – 8.9 (3.82) 5.82 –6.98 5.7 – 6.9 6.04 – 6.57 5.20 – 6.70 7.0-8.5A Fortnightly during construction,

then quarterly post-construction. Total dissolved solids

(TDS) mg/L 1.08-4.3 1.25 – 3.55 0.522 – 723 0.283 – 0.641 0.283 –

0.641

NA

Electrical Conductivity (EC) µS/cm

1499 – 6393 1711- 4040 737 – 8130 400 – 700 344 – 451 NA

Redox potential No trigger level proposed

Dissolved Oxygen (DO) %

No trigger level proposed

Turbidity NTU 4.1 – 31 16 – 35 1.5 – 5.1 9.6 -148.2 8.98 – 1078 10-100

Colour GILVIN 440 No trigger level proposed

temperature (profiling) No trigger level proposed

Total Nitrogen (TN) µg/L

>15,000 > 7220 >2740 >3060 >2860 >1500A Monthly during construction and

then quarterly post-construction.

Total Phosphorus (TP) µg/L

>428 >754 >164 >968 >222 >60A

Ammonia as N µg/L 302 >1720 >52.8 >168 >90 40A

Nitrate+nitrite as N µg/L

99 >19.4 >20.8 >86.6 >24.4 100A

Total Kjeldahl nitrogen (TKN) µg/L

>15,000 > 7220 >2740 >3040 >2860 NA

Orthophosphate µg/L >61.4 > 49.6 15.2 272 74 30A

TN: TP ratio No trigger level proposed.

Arsenic (As) µg/L > 10 >4 >0.9 >0.9 >2.5 24 as As(III)B

13 as As(V)B

Aluminium (Al) µg/L > 67 > 20.6 > 302 > 110.0 > 284 NA (pH<6.5)

Cadmium (Ca) µg/L > 0.1 >0.4 >0.1 >0.1 >0.1 0.2B

Chromium (Cr) µg/L >0.9 >2 >1.9 >1.1 > 1.4 1 as Cr(VI)B

Copper (Cu) µg/L >0.4 >3.7 >0.9 >2.9 > 1.1 1.4B

Manganese (Mn) µg/L > 49 >818 >30 >36 > 16.8 1900B


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Nickel (Ni) µg/L >1.3 >5.8 >1.2 >1.3 > 1.0 11B

Lead (Pb) µg/L >1.1 >6.6 >0.7 >2.9 > 0.9 3.4B

Selenium (Se) µg/L >0.5 >1 >1 >1 > 1 5B

Zinc (Zn) µg/L >2 >88 >14.4 >27 > 14 8B

Iron (Fe)*µg/L >2540 > 13.6 >1820 >3900 > 880 NA

TRH >C10 – C16 (µg/L)

61 25 25 60 91 NA

TRH >C16 – C34 (µg/L)

406 828 100 940 100 NA

TRH C34 – C40 (µg/L) 100 344 100 426 100 NA

TRH C6 – C10 (µg/L) 25 25 25 25 25 NA

Benzene (µg/L) 1 1 1 1 1 950

Ethylbenzene (µg/L) 1 1 1 1 1 NA

Toluene (µg/L) 1 1 1 1 1 NA

Xylene (µg/L) 2 2 2 2 2 200

BTEX µg/L > 5 > 5 > 5 > 5 > 5 NA

Bio-indicators Chlorophyll a µg/L >160 > 440 > 15 > 79.4 > 9.3 30A

Surface water monitoring - Secondary parameters

Total acidity as CaCO3 (mg/L)

2.2 - 4.2 22.1 – 68.6 9.6 – 38.4 8.8 – 25.7 15.2-20.4 NA Annually, in October during construction and post-construction. Total alkalinity as

CaCO3 (mg/L) 142.0 – 199.7 >156 8 – 38.4 59 – 75.1 17.6-57.4 NA

Chloride mg/L 324 – 2260 406 – 1380 178 – 220 48 – 150 63.6 – 81.4 NA

Sulfate mg/L 78.2 – 216 354 – 2420 65.2 – 126 27 – 76 37.8 – 53.2 NA

Carbonate mg/L 14.6-31.8 > 2 > 2 > 2 > 2 NA

Bicarbonate No trigger level proposed.

Calcium No trigger level proposed.

Magnesium No trigger level proposed.

Bicarbonate mg/L No trigger proposed

Calcium mg/L 70 – 170 112 - 552 16.8 – 21.6 25 – 32 20.4 – 23 NA

Magnesium mg/L 30.6 – 140 53 - 348 17.8 – 24.8 7 – 17 7.5 – 8.8 NA

Sodium mg/L 174 – 1122 234 – 880 124 – 97.4 24 – 86 39.2 – 47.7 NA

Potassium mg/L 15.2 – 73.4 30.4 -36.6 11 – 14 4.8 – 9.7 7.7 – 10.8 NA


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Bio-indicators Aquatic macro-invertebrates

Species richness and/or abundance of aquatic macro-invertebrates has reduced by more than 25% compared to baseline levels

Annually in spring during construction and post-construction.

Waterbirds No trigger level proposed Once in January/February during construction and post-construction.

*Metals measured will be totals

NA Not available/ not applicable A

ANZECC & ARMCANZ (2000) guidelines for slightly disturbed ecosystems in the south-west Australia – wetlands B

ANZECC & ARMCANZ (2000) guidelines for slightly disturbed ecosystems in the south-west Australia. Trigger levels for freshwater (95% level of protection)


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Table 5: Wetland quality monitoring program and trigger values- Groundwater

Parameter Parameter/Analytes to be tested* Trigger values and ranges


Primary parameters

Physiochemical properties Water levels Bore is dry or unable to be pumped

Change >0.5 m from previous reading

Fortnightly during construction, then quarterly post-construction.

pH 5.2-5.9 7.0-8.5A Fortnightly during construction, then quarterly post-

construction. TDS mg/L 178 – 780 NA

EC µS/cm 274-1199 NA

Redox potential No trigger level proposed

DO No trigger level proposed

Temperature (profiling) No trigger level proposed

TN µg/L >1980 1500A Monthly during construction, then quarterly post-construction.

TP µg/L >220 60A

Ammonia as N µg/L >590 40A

Nitrate+nitrite as N µg/L >650 100A

total Kjeldahl nitrogen (TKN) >1460 NA

Orthophosphate µg/L 270 30A

TN:TP ratio No trigger level proposed

As µg/L >2 13B

Al µg/L >430 NAB

(pH<6.5)

Cd µg/L >0.1 0.2B

Cr µg/L >10.8 1 as Cr(VI)B

Cu µg/L >4 1.4B

Mn µg/L >17.2 1900B

Ni µg/L >10.4 11B

Pb µg/L >1 3.4B

Se µg/L >10 11B

Zn µg/L >5 8B

Fe µg/L >2932 NA

TRH >C10 – C16 (µg/L) >100 NA

TRH >C16 – C34 (µg/L) >100 NA

TRH C34 – C40 (µg/L) >100 NA

TRH C6 – C10 (µg/L) >20 NA

Benzene (µg/L) >1 950


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Parameter Parameter/Analytes to be tested* Trigger values and ranges


Ethylbenzene (µg/L) >2 NA

Toluene (µg/L) >2 NA

Xylene (µg/L) >2 200

BTEX µg/L >2 NA

total TPH No trigger level proposed

BTEX No trigger level proposed

Secondary parameters

Physiochemical properties Total alkalinity as CaCO3 (mg/L) 12 – 39 NA Annually, in October during construction and post-construction.

Chloride mg/L 6 – 27.2 NA

Sulfate mg/L 49-266 NA

Carbonate mg/L 36-1284 NA

Bicarbonate mg/L >1 NA

Calcium mg/L 5 – 47 NA

Magnesium mg/L 8 – 24 NA

Sodium mg/L 27-150 NA

Potassium mg/L 40 – 110 NA

NA Not available/ not applicable

A ANZECC & ARMCANZ (2000) guidelines for slightly disturbed ecosystems in the south-west Australia – wetlands

B ANZECC & ARMCANZ (2000) guidelines for slightly disturbed ecosystems in the south-west Australia. Trigger levels for freshwater (95% level of protection)


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Table 6: Wetland quality monitoring plan and trigger values - sediment

Parameter Parameter/Analytes to be tested* Trigger value and ranges

Timing/ frequency Guideline value

Secondary parameters

Sediment quality Total Organic Carbon No trigger level proposed. Annually during construction and post-construction.

pH • pH >7.5C

• pH < 5.6C

• Change in pH >1 since last readingC

redox potential No trigger level proposed

As* mg/kg 20A

Cd* mg/kg 1.5A

Cr* mg/kg 80A

Cu* mg/kg 65A

Mn* mg/kg 500B

Ni* mg/kg 21A

Pb* mg/kg 50A

Se* mg/kg No trigger level proposed.

Zn* mg/kg 200A

Fe* mg/kg No trigger level proposed.

total TPH Above level of detection

Total PAHs µg/kg 4000A

Organophosphate Pesticides Above level of detection

Net acidity 0.03% S

18 mol H+/tonne (oven-dry basis)

Particle size distribution No trigger level

*Metals measured will be totals. A

ANZECC & ARMCANZ (2000) Interim Sediment Quality guidelines B Table 1 in DEC (2010) Assessment levels for soil, sediment and water - Contaminated sites management series

C AECOM (2012)

Figure 3: Wetland surface water and sediment monitoring locationsLegend!( Surface water sampling locations

# Sediment sampling locationsProject development envelopeWetlands

#

#

#

#

#

!(

!(

!(

!(

!(!(

!(

!(

!(

!(

!(!(

!(

!( MelaleucaSwamp

North Lake

Lower Swamp(Frog Swamp)

Bibra Lake

Horse PaddockSwamp

RoeSwamp

A1

A3S1

A2

A1EA1N

RD1

FS2

A2S

RD1A

FS4A

NLWS-N2

BLNS-B1

BL Jetty

NL5

NL1

SD1NL3

BLN1

389000

389000

389500

389500

390000

390000

390500

3905006448

000

6448

000

6448

500

6448

500

6449

000

6449

000

6449

500

6449

500

6450

000

6450

000

6450

500

6450

500

6451

000

6451

000


Scale at A4

Source: Aerial image: Nearmaps 2016; Wetlands: DPaW 2015; Development envelope: Client 2015.


0 100 200 300 400Meters

1:13,500



¹[email protected]

Figure 4: Wetland groundwater monitoring locationsLegend!( Impact groundwater bore#* Reference groundwater bore

Project development envelopeZone of indirect impactsWetlands

#*

!(!(

#*#*

!(

#*!(

!(

!(

!(!(

!(

MelaleucaSwamp

North Lake

Lower Swamp(Frog Swamp)

Bibra Lake

Horse PaddockSwamp

North

Lake

Rd

RoeSwamp

T4C T4B

T3C T3B

T2F

BH12

BH10

GW-D8 GW-D7

GW-D5

GW-D4GW-D3

GW-T3E-A

388500

388500

389000

389000

389500

389500

390000

390000

390500

390500

6448

000

6448

000

6448

500

6448

500

6449

000

6449

000

6449

500

6449

500

6450

000

6450

000

6450

500

6450

500


Scale at A4

Source: Aerial image: ESRI, approx. 2010; Development envelope: Client 2015; Wetlands: DPaW 2015.


0 100 200 300 400Meters

1:15,000



¹[email protected]

Figure 5: Wetland surface water monitoring locations (for aquatic macro-invertebrate survey)

Legend!( Macroinvertebrate monitoring locations

Development envelope

!(

!(!(

!(

!(

!(

!(

North LakeLower Swamp(Frog Swamp)

Bibra Lake

Stock

Rd

North

Lake

Rd

Kwina

na Fw

y

RoeSwamp

South Lake

Yangebup Lake

Thomsons Lake

Kogolup Lake

Source: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX,Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS UserCommunity

385000

385000

386000

386000

387000

387000

388000

388000

389000

389000

390000

390000

391000

391000

392000

392000

393000

393000

6441

000

6441

000

6442

000

6442

000

6443

000

6443

000

6444

000

6444

000

6445

000

6445

000

6446

000

6446

000

6447

000

6447

000

6448

000

6448

000

6449

000

6449

000

6450

000

6450

000

6451

000

6451

000


[email protected]

Scale at A4

Source: Existing cadastre: SLIP, landgate 2016.


0 0.25 0.5 0.75 1 1.25Kilometers

1:48,924


Date: 27/10/2016Author: JCrute

¹


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3. Management

Management actions may be necessary in the event that monitoring indicates a change in wetland health

potentially caused by the Project. In order to determine whether an impact has occurred as a result of the

project trigger values are required to be determined.

3.1 Contingency measures

In the event monitoring indicates that the trigger and guideline values specified in Table 4, Table 5 and

Table 6 have been exceeded, the following actions will occur:

1. Immediately implement management and/or contingency actions specified in Table 7

• continue to implement actions until trigger and guideline values are met or until CEO of OEPA

confirms in writing that actions are no longer required.

2. Investigate the cause of the trigger and guideline values being exceeded and identify any further

contingency actions required to prevent trigger and guideline values from being exceeded in the

future.

3. Provide a report to the CEO of the OEPA within seven days of trigger and guideline values being

exceeded. The report shall include:

• details of management and/or contingency actions implemented

• findings of the investigation conducted.

Contingency actions to be undertaken on the basis of wetland health are outlined in Table 7. Contingency

measures undertaken will be reported in the annual report (refer to Section 4.2).

Table 7: Contingency measures

Parameter Trigger Contingency action

Surface water quality

Surface water quality exceeds baseline and guideline trigger values (refer to Table 4)

1. Resample affected location within four weeks of original sampling event.

2. If both rounds show that surface water quality at the impact locations exceeds trigger values and ranges, and the guidelines, identify cause (e.g. review data collected from control sites, review nearby lakes monitored monthly by DoW, review samples from other monitoring locations (as per the DMMP and WMMP), review bio-indicators sampling results and review sediment sampling results).

3. If the stormwater system is considered to be the source of the contaminants, determine cause of contamination and remediate if required. This could include reviewing stormwater management system to identify the issue and perform maintenance and management activities as described in the Drainage Management and Monitoring Plan and Construction Environmental Management Plan as required.

4. Continue monitoring surface water quality and the effectiveness of remedial actions.

Groundwater levels

Bore is dry or unable to be pumped

Change >0.5 m from previous reading

1. If bore is dry determine reason why (low groundwater, blocked bore).

2. Determine cause for rapid change in groundwater level.

3. Determine if trigger is within normal seasonal range.

4. If drying/wetting event is unseasonal, determine cause of event.

5. Continue monitoring ground water levels and the effectiveness of remedial actions.


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Parameter Trigger Contingency action

Groundwater quality

Groundwater quality exceeds baseline and guideline trigger values (refer to Table 5)

1. Determine if reference bore water quality also exceeds trigger values, range and guidelines.

2. Resample affected bore within four weeks of original sampling event.

3. If both rounds show that groundwater quality at the impact bore exceeds trigger values and concentrations are 20% above concentrations at the reference bores, identify likely cause (e.g. review data collected from control site, review nearby lakes monitored monthly by DoW, review samples from other monitoring locations (as per the DMMP and WMMP), review bio-indicators sampling results and review sediment sampling results).

4. If the stormwater system is considered to be the source of the contaminates, determine cause of contamination and remediate if required. This could include reviewing stormwater management system to identify the issue and perform maintenance and management activities as described in the Drainage Management and Monitoring Plan and Construction Environmental Management Plan as required.

5. Continue monitoring groundwater quality and the effectiveness of remedial actions.

pH (surface water and groundwater)

pH exceeds baseline and guideline trigger values (refer to Table 4 and Table 5)

1. Measure pH daily for seven days to ensure recording is not an anomaly.

2. Determine if reference groundwater bore water quality also exceeds targets.

3. Determine cause of pH change/low pH.

4. Continue monitoring groundwater quality and the effectiveness of remedial actions.

Macro-invertebrates

Species richness and/or abundance of aquatic macro-invertebrates has reduced by more than 25% compared to baseline levels

1. Resample affected location within four weeks of original sampling event. 2. If both rounds show that species richness of aquatic macro-invertebrates

at the impact locations exceeds trigger values identify cause (e.g. review

nearby lakes monitored monthly by DoW, review samples from other

monitoring locations (as per the DMMP and WMMP), review bio-

indicators sampling results and review sediment sampling results).

3. If considered to be a result of the project, determine whether remedial

action is required.

4. Implement remedial action/s, as advised by the aquatic macro-invertebrate expert.

5. Continue monitoring the effectiveness of remedial actions.


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4. Review and reporting

4.1 Review and revision

The WMMP will be reviewed annually, or more frequently if required, to ensure that the plan takes into

consideration amendments to operations, monitoring results, trigger values, contingency actions, audits,

continuous improvement and changes in regulatory and corporate requirements. Any proposed

amendments to the plan will be undertaken in accordance with condition 9 and provided to the CEO of the

OEPA for approval prior to implementation.

4.2 Reporting

An annual report summarising 12 months of monitoring results to 2 July will be produced prior to the

preparation of the annual Compliance Assessment Report (Section 4.3).

In accordance with Condition 9-10 of Statement 1008 the annual report will include:

• climate and rainfall information

• demonstration of compliance with maintenance requirements

• documentation of monitoring undertaken

• comparison of monitoring results to trigger values

• documentation of any contingency actions undertaken.

The annual report will be submitted to the CEO of OEPA as part of the Annual Compliance Assessment

Report. If any trigger events occur, these will be reported to the CEO of OEPA as per 3.1.

4.3 Auditing

Internal audits against this WMMP will be undertaken every three months during construction, and

annually for the first five years of operation.

Compliance with this WMMP will be reported in the annual Compliance Assessment Report, prepared in

accordance with the Compliance Assessment Plan.

4.4 Consultation

As part of the preparation of the WMMP, consultation with various stakeholders was undertaken as

detailed in Table 8:

Table 8: Stakeholder consultation

Stakeholder Date Outcome

Department of Parks and Wildlife (DPaW)

27 July 2015 The Scope of Works for the Baseline Wetland Condition and Baseline Drainage Monitoring Program was provided to DPaW for comment and comments were received from DPaW on the 27 July 2015. The WMMP has been updated to address relevant comments.

2 September 2015

The WMMP was provided to DPaW for comment and comments were received from DPaW on the 2 September 2015. The WMMP has been updated to address relevant comments.

Department of Water (DoW)

27 July 2015 The Scope of Works for the Baseline Wetland Condition and Baseline Drainage Monitoring Program was provided to DoW for comment and comments were received from DoW on the 27 July 2015.


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Stakeholder Date Outcome

8 September 2015

A meeting held with DoW to discuss their comments on the Scope of Works for the Baseline Wetland Condition and Baseline Drainage Monitoring Program, The WMMP has been updated based on this discussion and to address relevant comments that were received on the Scope.


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5. References

AECOM 2011, Roe Highway Extension Baseline Water and Sediment Quality Unpublished report prepared

for Main Roads, Perth, May 2011.

AECOM 2012, Groundwater Monitoring March 2011 to April 2012, Unpublished report prepared for Main

Roads, Perth, June 2012.

AECOM 2013, Water Management Strategy: Roe Highway Extension, Unpublished report prepared for

Main Roads, Perth, January 2013.

Aurecon 2016, Roe Highway Extension 247607 Baseline Analysis Report – Rev0, report prepared for Main

Roads Western Australia, 21 October 2016.

Australian and New Zealand Environmental and Conservation Council and Agriculture and Resource

Management Council of Australia and New Zealand (ANZECC and ARMCANZ).2000, National Water

Quality Management Strategy: Australian and New Zealand Guidelines for Freshwater and Marine

Water Quality, Australian Water Association, Canberra.

Bamford and Greatwich (2016). Baseline Survey of Waterbirds at Bibra Lake, Yangebup Lake and South

Lake for the Proposed Roe 8 Highway Development.

Department of Conservation and Land Management (CALM) 2006, Beeliar Regional Park Final

Management Plan, CALM, Perth.

Department of Environment and Conservation (DEC). 2009. Geomorphic Wetlands of the Swan Coastal

Plain data set. http://www.dec.wa.gov.au/management-andprotection/ wetlands/geomorphic-

wetlands-swancoastal- plain-dataset.html. Date accessed 02 June 2009.

Department of Environment Regulation (DER) 2014, Assessment and Management of contaminated sites

– contaminated site guidelines, Government of Western Australia, December 2014.

Department of Environment Regulation (DER) 2015, Identification and investigation of acid sulfate soils

and acidic landscapes, Government of Western Australia, June 2015.

Department of Water (DoW) 2004-8 Stormwater Management Manual for Western Australia, Department

of Water, Perth.

Department of Water (DoW) 2012, Environmental Management of Groundwater from the Jandakot Mound:

Triennial compliance report to the Office of the Environmental Protection Authority July 2008 to June

2011, Department of Water, Perth.

Department of Water (DoW) 2015, Perth Shallow Groundwater Systems Investigation North Lake,

Hydrological Record series Report no. HG42, Perth, Western Australia, May 2015.

Environmental Protection Authority and Water Authority of Western Australia. 1990. Jenny Arnold’s Perth

Wetlands Resource Book: Chapters 9-11, East Beeliar Wetlands, Wetlands of the South West

Corridor and of the Rockingham Plain. Bulletin 266, December 1990.

Environmental Protection Authority 2013, Roe Highway Extension, Report 1489, Office of the

Environmental Protection Authority, Perth.

Government of Western Australia 2005, Statement to amend conditions applying to proposals – Gnangara

Mound groundwater resources, Ministerial statement 688, Minister for Environment, Government of

Western Australia, Perth.

Environmental Protection Authority (EPA) 2013, Roe Highway Extension Report and Recommendations of

the Environmental Protection Authority, EPA Report 1489. Government of Western Australia, Perth.


MRO15099_05 R001 Rev 5

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Facility for Advancing Water Biofiltration (FAWB) 2009, Stormwater Biofiltration Adoption Guidelines,

Monash University, Melbourne.

Monash University 2014, Vegetation Guidelines for Stormwater Biofilters in the South-west of Western

Australia, Monash University, Melbourne.

South Metro Connect 2011, Roe Highway Extension Public Environmental Review, unpublished report

prepared for Main Roads Western Australia, June 2011.

South Metro Connect 2013, Roe Highway Extension Response to Public Submissions, prepared for Main

Roads Western Australia, 31 May 2013.Strategen 2015, Main Roads Roe Highway Extension

Baseline Wetland Condition Survey and Baseline Drainage Monitoring, Unpublished report to Main

Roads, Perth.

Strategen 2015, Roe Highway Extension Scope of Works for Baseline Wetland Condition Survey and

Baseline Drainage Monitoring Program, Unpublished report to Main Roads, Perth.

Appendix 1

Wetland quality monitoring

methodology


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Table A1: Wetland condition monitoring program methodology

Parameter Parameter/Analytes to be tested Methodology Timing/ frequency

Surface water monitoring - Primary parameters


Water levels Water levels will be manually measured using a water level stake. Existing DoW water level stakes will be used where possible. Fortnightly during construction, then quarterly.

pH, TDS, EC , redox potential, DO, turbidity, colour, temperature (profiling)

Surface water sampling will be undertaken in accordance with AS/NZS 5667.4:1998, Water quality – Sampling, Part 4: Guidance on sampling from lakes, natural and man-made. Given the shallow depth of the lakes (<1 m), the water will be assumed to be well mixed, samples will be taken from the middle of the water column at each surface water sampling location during sampling events to represent characteristics at each selected sampling location. Existing monitoring sites will be utilised where possible.

Profiling

Field water quality parameters will be obtained using a multi-parameter probe. Water physiochemical parameters such as pH, turbidity, DO, temperature and EC will be documented.

Blank samples

Rinsate blanks will also be collected and analysed for elements throughout the surface water sampling rounds. Laboratory provided deionised water will be used to rinse the equipment.

Duplicate samples

Each batch of samples will include one duplicate for every 10 samples submitted to the laboratory. The purpose of these duplicates will be to allow for the laboratory to perform internal quality assurance and the results will be included in the laboratory report.

Fortnightly during construction, then quarterly.

• nutrients including TN, TP, ammonia, nitrate/nitrite, total Kjeldahl nitrogen, orthophosphate, TN:TP ratio

• metals (As, Al, Cd, Cr, Cu, Mn, Ni, Pb, Se, Zn, Fe)

• total TPH and BTEX

Surface water sampling will be undertaken in accordance with AS/NZS 5667.4:1998, Water quality – Sampling, Part 4: Guidance on sampling from lakes, natural and man-made. Given the shallow depth of the lakes (<1 m), the water will be assumed to be well mixed, samples will be taken from the middle of the water column at each surface water sampling location during sampling events to represent characteristics at each selected sampling location. Existing monitoring sites will be utilised where possible.

Water samples will be collected directly into laboratory provided sample bottles with preservatives. Samples will be chilled and delivered to a NATA accredited laboratory for analysis within the laboratory’s stipulated holding time.

Blank samples

Rinsate blanks will also be collected and analysed for elements throughout the groundwater sampling rounds. Laboratory provided deionised water will be used to rinse the equipment.

Duplicate samples

Each batch of samples will include one duplicate for every 10 samples submitted to the laboratory. The purpose of these duplicates will be to allow the laboratory to perform internal quality assurance and the results were included in the laboratory report.

Monthly during construction and then quarterly post-construction.


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Bio-indicators • Chlorophyll a Chlorophyll a samples will be collected from two locations in the lakes using a sampling bailer. One sampling point will be located in the middle of the lake; the other at the edge of the lake to capture floating algae close to the shore.

Monthly during construction and then quarterly post-construction.

Surface water monitoring - Secondary parameters


• total acidity and total alkalinity

• major anions and cations (chloride, sulfate, carbonate, bicarbonate, calcium, magnesium, sodium and potassium)

As per quarterly parameters. Annually, in October during construction and post-construction.

Bio-indicators • Aquatic macro-invertebrates Samples of aquatic macro-invertebrates will be collected along inundated sections of shoreline from target lakes and swamps (North Lake, Bibra Lake, Roe Swamp and Horse Paddock Swamp) and reference lakes and swamps (selected from other wetlands within Beeliar wetlands connected to Jandakot Mound that are not anticipated to be impacted by the development including Thomsons Lake, Lake Kogolup and Lake Yangebup, as well as a swamp depending on seasonal water levels).

Samples will be collected using a 250µm net within each different habitat type (open water, near shore reeds/grasses, near shore paperbark forest). Results will be subject to a combination of field identification by experienced invertebrate biologists and laboratory identification to family level and considered in combination with surface water physicochemical properties.

Habitat data will also be collected from each monitoring site including vegetation structure, general observations, water level and water quality (e.g. conductivity, PH, temperature, Redox, Dissolved Oxygen etc).

Annually in spring during construction and post-construction.

• Waterbirds A survey of waterbirds will include Bibra Lake, Yangebup Lake and South Lake. The survey methodology will be consistent with the baseline waterbird survey undertaken for the project (Bamford and Greatwich 2016), comprising:

• undertaking counts of waterbird species, including species and numbers present,

• assigning one of four behavioural activities to each individual observed. These activities include foraging, resting, locomotion (flying, swimming or walking to a new location) and comfort (preening, stretching, bathing etc).

Observation will be undertaken through the use of spotting scopes and binoculars to accurately record waterbird species and

abundance.

Surveyed once in January/February during construction and post-construction.


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Groundwater monitoring - Primary parameters

Physiochemical properties– Primary parameters

Water levels Monitoring bores will be placed up and down gradient of the wetlands. Actual locations will be confirmed based on site access and long term site availability. Existing monitoring sites will be utilised where possible.

Bore installation

Groundwater bores will be installed to a depth of 3 m below the groundwater table to account for natural fluctuations in the height of the groundwater table. The screen will be set so a 2 m section is above the water table where possible. Installation of groundwater monitoring bores will be conducted with the use of a stem auger drill rig or similar, which allows the collection of soil samples/cores to a depth of 10 m below surface level and will allow a better description of the deep lithology. This style of drilling rig allow for the installation of monitoring bores without the potential for the bore hole collapsing and are therefore ideal for wetland conditions. Pre-drilling safety works will include Dial Before You Dig searches and cable location to confirm that services will not be impacted by the drilling process. All bores drilled will be geologically logged and surveyed for top of casing and ground levels for use in the Wetland Condition Monitoring and Management Plan.

Manual readings

Water levels in groundwater bores will be manually dipped using a Heron Dipper- T water level instrument or similar. Manual dipping of water bores will be undertaken at the time of data downloads.


• pH, TDS, EC, redox potential, DO, temperature

Groundwater sampling will be undertaken in accordance with AS/NZS 5667.11:1998, Water quality – Sampling, Part 11: Guidance on sampling of groundwaters. The bore will be purged until field parameters become stabilised. Purged water will be collected in a pail and disposed of away from the bore site.

During the purging process, physical water parameters (pH, DO, conductivity, temperature, and redox potential) will be measured using a multi-parameter probe. The readings will be taken at 5 minute intervals and recorded.

Water samples will be collected from the bore once field readings are stabilised (i.e. the difference between successive readings is within 10%, except for pH which will be within 0.1).

A peristaltic pump will be used to collect water from bores with a depth of less than 15 m. A foot valve pump will be used to collect samples from deeper bores. For both collection methods, site-specific tubing will be used to avoid cross-contamination between sites. Water samples will be discharged into sample bottles directly from the tubing.

Decontamination

Re-useable equipment will be washed and rinsed using a 2% solution of Decon 90 and finally rinsed with laboratory supplied de-ionised water. This was to minimise the potential for cross-contamination between sites.

Blank samples


Duplicate samples

Each batch of samples will include one duplicate for every 10 samples submitted to the laboratory. The purpose of these duplicates was to allow the laboratory to perform internal quality assurance and the results were included in the laboratory report.



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• TN, TP, ammonia, nitrate/nitrite, total Kjeldahl nitrogen, orthophosphate, TN:TP ratio

• metals (As, Al, Cd, Cr, Cu, Mn, Ni, Pb, Se, Zn, Fe)

• TPH and BTEX

Groundwater sampling will be undertaken in accordance with AS/NZS 5667.11:1998, Water quality – Sampling, Part 11: Guidance on sampling of groundwaters. The bore will be purged until field parameters become stabilised Purged water will be collected in a pail and disposed of away from the bore site.

Water samples will be collected from the bore once field readings are stabilised (i.e. the difference between successive readings is within 10%, except for pH which will be within 0.1).

A peristaltic pump will be used to collect water from bores with a depth of less than 15 m. A foot valve pump will be used to collect samples from deeper bores. For both collection methods, site-specific tubing will be used to avoid cross-contamination between sites. Water samples will be discharged into sample bottles directly from the tubing.

Decontamination

Re-useable equipment will be washed and rinsed using a 2% solution of Decon 90 and finally rinsed with laboratory supplied de-ionised water. This was to minimise the potential for cross-contamination between sites.

Blank samples


Duplicate samples


Quarterly (January, May, August, October).

Groundwater monitoring - Secondary parameters

Physiochemical properties – secondary parameters

• total acidity and total alkalinity

• major anions and cations (chloride, sulfate, carbonate, bicarbonate, calcium, magnesium, sodium and potassium)

As per quarterly parameters. Annually, in October during construction and post-construction.

Sediment monitoring - Secondary parameters

Sediment quality • Total Organic Carbon

• pH

• redox potential

• Metals (As, Cd, Cr, Cu, Mn, Ni, Pb, Se, Zn, Fe)

• TPH and BTEX

• Particle size distribution

Sediment samples will be taken using a stainless steel hand spade. Samples were separated based on depth intervals. Upper horizon surface samples were collected from the upper 5 cm of sediment and the lower horizon samples from 10–20 cm depth.

Blank samples

One rinse blank sample will be collected and analysed at the completion of the soil sampling. Laboratory provided deionised water will be used to rinse the equipment. The rinsate sample will be analysed for elements.

As this parameter is anticipated to be less variable than water quality and levels only one sampling event is proposed.

Duplicate samples


Annually during construction and post-construction.

Appendix 2

Monitoring locations


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*MGA 94, Zone 50

Groundwater monitoring locations

Groundwater bore *Easting *Northing

T2F 389498.37 6450297.29

T3B 390280.60 6449816.19

T3C 390003.00 6449795.00

T4B 390119.23 6449482.37

T4C 389898.81 6449447.89

BH10 390260.00 6449758.00

BH12 390836.00 6449532.00

GW-D3 390517.10 6449539.45

GW-D4 390286.74 6449624.07

GW-D5 389432.30 6449789.30

GW-D7 388900.03 6449587.97

GW-D8 388830.23 6449552.82

GW-T3E-A 389223.73 6449820.40

*MGA 94, Zone 50

Sediment monitoring location

*MGA 94, Zone 50

Surface water monitoring location

Site *Easting *Northing

Bibra Lake BLNS-B1 388996 6449292

A2 388758 6448816

A2S 388940 6449345

Bibra Lake Jetty# BL Jetty 388761 6448921

Frog Swamp FS2 389529 6450214

FS4A 389515 6450242

Roe Drain RD1 390193 6450103

RD1A 390190 6450039

Roe Swamp South S1 390041 6449521

A3 390040 6449566

North Lake NLWS-N2 388859 6450363

A1 388868 6450330

A1N 388867 6450403

A1E 389081 6450339

Sediment monitoring location

Site No *Easting *Northing

Bibra Lake BLN1 388936 6449312

Frog Swamp NL3 389455 6450200

Roe Drain SD1 390193 6450103

North Lake NL1 388884 6450416

Roe Swamp NL5 390040 6449567


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Macroinvertebrate monitoring location

Site location Latitude (GDA 94) Longitude (GDA 94)

Bibra Lake -32.090263 115.821427

Frog Swamp -32.079012 115.830061

North Lake -32.077936 115.823183

Roe Swamp -32.08519 115.834787

Kogolup Lake -32.127159 115.834523

Thomsons Lake -32.155229 115.825064

Yangebup Lake -32.116929 115.834892

Roe Highway Extension Wetlands Monitoring and Management Plan · Roe Highway Extension MRO15099_05 R001 Rev 5 30-Nov-16 Table of contents Summary i 1. Context, scope and rationale

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