Works Approval Application - Supplementary Report ...€¦ · 4.3 Previous Experience ... Hanson...

Works Approval Application – GNCJV Sand Extraction

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Works Approval and Licence Application Great Northern Connect Joint Venture

Works Approval Application - Supplementary Report NorthLink Central Section Sand Extraction

Document details

Document Number NLCS-DWER-WA 001

Revision Rev 1


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Revision History

Revision Date Revision description Prepared Reviewed Approval

0 1 Dec 2017 Issued for Review ESR BMD SFB

1 5 Dec 2017 Issued for Information ESR BMD SFB


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Table of contents

1. Executive Summary of Application ....................................................................................... 5

1.1 Structure of this Report .......................................................................................................... 6

2. Northlink WA Project ............................................................................................................... 6

2.1 Project scope ......................................................................................................................... 6

2.1.1 General .......................................................................................................................... 6

2.1.2 Separable portions ........................................................................................................ 7

2.1.3 Project features ............................................................................................................. 8

2.2 Main Roads' project and delivery objectives ......................................................................... 9

2.3 Integration within project management framework .............................................................10

3. Subject Land (‘Premises’) .....................................................................................................12

4. Application (‘Proposed Activities’) ......................................................................................16

4.1 Overview ..............................................................................................................................16

4.2 Justification ..........................................................................................................................19

4.3 Previous Experience ............................................................................................................19

4.3.1 Hanson Construction Materials Pty Ltd ...................................................................... 19

4.3.2 BGC Australia Pty Ltd ................................................................................................. 19

4.4 Summary of Proposed Activities .........................................................................................20

4.5 Cost of Proposed Development ..........................................................................................20

4.6 Clearing of Native Vegetation ..............................................................................................23

4.7 Topsoil and Overburden Management ...............................................................................23

4.8 Sand Extraction....................................................................................................................23

4.9 Screening .............................................................................................................................23

4.10 Expected production ............................................................................................................24

4.10.1 Maximum production capacity ................................................................................ 24

4.10.2 Processing throughput ............................................................................................ 24

4.11 Transportation and Traffic Management .............................................................................24

4.11.1 Site Access .............................................................................................................. 24

4.11.2 Traffic Generation .................................................................................................... 25

4.11.3 Refuelling and Servicing / Maintenance ................................................................. 25

4.12 Closure and Rehabilitation Plan ..........................................................................................25

5. Approvals, Permits and Licences ........................................................................................27

5.1 Existing Approvals ...............................................................................................................27

6. Consultation ...........................................................................................................................27

7. Site Investigations and Assessments .................................................................................29

8. Environmental Siting and Biophysical Description ...........................................................29

8.1 Summary ..............................................................................................................................29

8.2 Climate .................................................................................................................................29

8.3 Specified Ecosystems and Significant Natural Areas .........................................................30

8.3.1 Regional / Conservation Reserves ............................................................................. 30

8.3.2 Bush Forever ............................................................................................................... 30

8.3.3 Threatened Ecological Communities (TECS) ............................................................ 30

8.4 Geology, Soils and Topography ..........................................................................................30


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8.5 Acid Sulfate Soils .................................................................................................................30

8.6 Contamination ......................................................................................................................33

8.7 Groundwater ........................................................................................................................33

8.8 Surface Water ......................................................................................................................33

8.9 Wetlands ..............................................................................................................................33

8.10 Vegetation and Flora ...........................................................................................................33

8.11 Threatened and Priority Flora ..............................................................................................40

8.12 Significant Fauna Habitat ....................................................................................................40

8.13 Aboriginal Heritage ..............................................................................................................40

8.14 Residential Receptors..........................................................................................................40

9. Environmental Risks and Management ..............................................................................41

9.1 Fugitive Emissions – Dust ...................................................................................................41

9.1.1 Emission Description................................................................................................... 42

9.1.2 Emission Control ......................................................................................................... 42

9.1.3 Emission Monitoring .................................................................................................... 43

9.2 Noise and Vibration .............................................................................................................47

9.2.1 Emission Description................................................................................................... 48

9.2.2 Ambient Noise Monitoring - Existing Noise Levels ..................................................... 48

9.2.3 Emission Control ......................................................................................................... 48

9.2.4 Enquires, complaints, commendations ....................................................................... 51

9.2.5 Non-conformance, incident and corrective action ...................................................... 51

9.3 Surface Water ......................................................................................................................52

9.4 Groundwater ........................................................................................................................52

9.5 Vegetation and Flora ...........................................................................................................52

9.6 Dieback Management..........................................................................................................52

9.7 Weed Management .............................................................................................................53

9.8 Acid sulphate soils ...............................................................................................................53

9.9 Aboriginal Heritage ..............................................................................................................53

9.10 Bushfire ................................................................................................................................53

10. Community Engagement ..................................................................................................54

11. Conclusion .........................................................................................................................54


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1. Executive Summary of Application

Main Roads Western Australia (MRWA) is constructing a new section of the Perth–Darwin National Highway (PDNH). NorthLink WA will provide a vital, state of the art transport link between Morley and Muchea. It will reduce travel times and congestion, and provide significant productivity benefits to the economy, industry, motorists and local communities.

Great Northern Connect (GNCJV) is a joint venture between Laing O'Rourke Australia Construction Pty Ltd and BGC Contracting Pty Ltd, and is delivering the NorthLink Central Section (NLCS) for MRWA.

The NLCS Project extends north from the intersection of Tonkin Highway and Reid Highway in Malaga through Whiteman Park to Gnangara Road, Lexia. The highway then deviates north-east through Gnangara-Moore River State Forest and borders the north-west of Ellenbrook, before proceeding in a generally northern orientation to Maralla Road north of Ellenbrook.

This report has been prepared to support the Application for a new concurrent Works Approval and Licence lodged with the Department of Water and Environmental Regulation (DWER), to assist in the delivery of this project. This Application for a new concurrent Works Approval and Licence under the Environmental Protection Regulations 1987, is lodged for a Category 12 Premises, defined as a Premises on which material extracted from the ground is screened, washed, crushed, ground, milled, sized or separated.

In the northern section of the NLCS, the road alignment traverses two large areas subject to significant cut to maintain appropriate road grades. The underlying sand represents a significant material resource, noting that the NLCS traverses and is in close proximity to the existing Hanson Silica sand mine site at Gaskell Avenue (Works Approval Licence L6752/1995/11).

In summary, the current Application includes:

▪ Sand to be removed from two areas of significant cut within NLCS alignment to maintain appropriate road grades.

▪ Sand Area A: approximately 50,000 m3 of manufacturing sand over approximately 8 weeks.

▪ Sand Area B: c.a. 300,000 m3 of manufacturing sand over approximately 45 weeks.

▪ Sand Area A may not proceed depending on the timing of the Works Approval process.

▪ Sand to be screened on site at approximately 1500 tonnes / day and stockpiled using stacker for lot conformance testing

▪ Sand to be loaded out using wheeled loaders and transported offsite post compliance verification and testing (circa 1 month lead to provide adequate stockpiles for loadout).

▪ Proposal does not over-extract sand. All sand proposed to be utilised would otherwise be subject to earthworks cut to fill operations for NLCS if not used for manufacturing sand.

▪ Sand to be used by BGC Australia in manufacture of concrete, concrete noisewalls, asphalt and brickpavers for the NLCS project.

This report provides background to the Project, describes the Subject Land and its context, explains the proposed development components and provides justification for the proposal having regard for relevant environmental and planning considerations. This report presents the environmental values within the site, and how these have been incorporated into specific design and management responses. In addition, the report provides an assessment of the key potential impacts to environmental factors, and proposed management measures ensures the proposed development will not significantly impact the environmental values of the area.

As part of the due diligence undertaken for the Application, a comprehensive suite of assessments have been undertaken to support the current Proposal. The outcomes of these investigations have informed the Project’s design, operation and management. Management


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measures are integrated with the existing approvals to have minimal impact on the surrounding natural and human environment.

The PDNH (Swan Valley Section) has already been subject to Public Environmental Review and approved by the Western Australian Minister for Environment in Ministerial Statement No.1036 (23rd September 2016), and a decision was made under sections 130(1) and 133 of the EPBC Act 1999 to approve the PDNH (Swan Valley Section), WA (EPBC 2013/7042) on 2nd of December 2016.

1.1 Structure of this Report

This report has been prepared to support the Application for a new concurrent Works Approval and Licence. The report is structured in accordance with the Works Approval and Licence Application Form. This report should be read in conjunction with the Works Approval and Licence Application, along with primary project documents (refer to Attachment 8 of the Application):

GNC Environmental Management Plan.

Reports as contained in Part 9 and Attachment 8 of the Application.

2. Northlink WA Project

The three Stages that make up the Northlink WA Project are vital components of a wider series of improvements to the Perth Darwin National Highway (PDNH). Northlink WA is a new 37km link from the intersection of the Reid and Tonkin Highways to Great Northern Highway and Brand Highway at Muchea. It is split into 2 sections (Central and North) with the division between the two sections at Maralla Road, Ellenbrook. The central section shall be completed as a single contract which comprises the Northlink WA Stage 2 project (the NLCS Project).

The primary objective of these improvements is to enhance freight efficiency and productivity by reducing travel time and improving journey time reliability between the Perth Metropolitan Area and the north west of Australia.

It will provide another crucial link in the Perth Urban Transport Corridor through a dedicated, highly efficient North South connection, creating links from Perth to North West WA between Perth's heartland industrial areas, such as Kewdale, Welshpool, and Fremantle Port. Current stop-start traffic will be replaced with free-flowing movement.

The project will link with the Gateway WA project and the Perth Freight Link project to provide a free-flowing 85km route from Muchea to Fremantle Port and Perth's southern industrial and trade centres – delivering significant benefits to the economy, industry, motorists, and local communities. The project will result in improved safety for all road users, reduced traffic congestion, fewer trucks on urban roads, lower emissions, reduced noise and significant freight industry productivity improvements.

2.1 Project scope

2.1.1 General

The Project includes the following:

▪ Investigation, design and construction to the required standards and in accordance with environmental requirements consistent with the location of the Project Works.

▪ Provision of all connections, modifications and improvements necessary to link the Project Works to the existing road network.

▪ Relocation of services and other utilities required for construction of the Project Works.


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▪ Maintenance of landscaping and drainage for a three year period.

▪ Repairs to all defects which occur within a period of five years from practical completion and which are not part of routine maintenance requirements.

Stage 2 of the project comprises the design and construction of a 17.5 km section of the Perth Darwin National Highway (PDNH) between Tonkin Highway and Maralla Road, which includes:

▪ The Reid Highway / Tonkin Highway Systems Interchange;

▪ The Grade Separation of Beechboro Road North over Reid Highway;

▪ The Grade Separation of Marshall Road over PDNH;

▪ The Hepburn Avenue / PDNH Grade Separated Roundabout Interchange;

▪ The Gnangara Road / PDNH Partial Parclo Interchange;

▪ The Promenade / PDNH Grade Separated Roundabout Interchange;

▪ Intersection of Reid Highway and Altone Road;

▪ Altone Road Modifications;

▪ Landscaping;

▪ Relocation of services and facilities;

It is envisaged the project shall be operational for traffic by mid-2019.

2.1.2 Separable portions

It is anticipated that the Project will be delivered in three separable portions as follows:

Table 2-1. Project separable portions.

Separable Portion Completion date of Contract Description of Project Works included

Separable Portion 1 September 2019 Revegetation and landscaping works

Separable Portion 2 Mid 2019 (140 weeks from Award) The balance of the Project Works

Separable Portion 3 December 2017 All Project Works along Altone Road and the intersection of Reid Highway / Altone Road intersection including all turning lanes


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Figure 2-1. The Northlink WA Project location plan including major road intersections.

2.1.3 Project features

Northlink WA – The Project is the second package of a program of works to upgrade Tonkin Highway to freeway standards and extend this link northward via Ellenbrook to connect with both Great Northern Highway and Brand Highway at Muchea. The following elements need to be taken into consideration:

▪ Urbanisation.

▪ Vehicle Traffic.

▪ Pedestrian and Cyclist Traffic.

▪ Services.

▪ Drainage.

▪ Road Reserve/Proposed Road Reserve.

▪ Community Issues.

▪ Interface with other Northlink WA project works.


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2.2 Main Roads' project and delivery objectives

The primary objective of this Project is to provide efficient and safe road access for all road users and to provide road infrastructure that supports economic and regional development.

More detailed project objectives for Northlink WA are to:

▪ Improve freight capacity, efficiency and productivity.

▪ Reduce urban congestion now and into the future.

▪ Improve road safety through the “Towards Zero” initiative.

▪ Improve amenity for the community, tourists and road users.

▪ Maximise sustainability through economic, social and environmental improvement.

▪ Create value through affordable infrastructure.

The Great Northern Connect Team understands that the successful delivery of the NLCS Project is critically linked to meeting Main Roads' project and strategic Perth Urban Transport Corridor delivery objectives (Figure 2-2).

These objectives have shaped our vision for the project which is framed around creating exceptional value-for-money and certainty in delivering a world class road transport corridor.

In delivering this vision and satisfying or exceeding all project and delivery objectives, we will:

▪ Continue to develop a culture of quality where everyone strives to elevate the mindset to perform the works once and without errors.

▪ Maintain a strong project culture, focussed on innovation and achieving outstanding and more sustainable project outcomes.

▪ Diligently manage delivery risks.

▪ Identify and capitalise on delivery opportunities.

▪ Effectively manage project interfaces with Stage 1 & 3 of the Northlink WA project, and broader metropolitan road network.


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Figure 2-2. Main Roads' project and delivery objectives.

2.3 Integration within project management framework

Our proposed project management system (Figure 2-3) shows full integration of proven management plans and sub-plans that will facilitate a seamless approach to design and construction, assurance, organisation and value creation management.

Our project management system is underpinned by strong governance and compliance management, and clearly embodies Main Roads' project and delivery objectives.


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Figure 2-3. Project management system framework.


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3. Subject Land (‘Premises’)

Part 2 and Attachment 2 of Application.

Premises: Sand Extraction Area A:

Part Lot 9507 Maralla Road, Ellenbrook, WA 6069 Volume 2714, Folio 608, LOT 9507 ON PLAN 53136

Lot 9508 Maralla Road, Ellenbrook, WA 6069 Volume 2714, Folio 609, LOT 9508 ON PLAN 53136

Lot 12851 Maralla Road, Ellenbrook, WA 6069 Volume LR3110, Folio 139, LOT 12851 ON PLAN 21246


Sand Extraction Area B:

Lot 80 Maralla Road, Ellenbrook, WA 6069 Volume 2066, Folio 893, LOT 80 ON PLAN 21245


Applicant: Great Northern Connect Joint Venture

Local Government Area: City of Swan

Development Scheme: Local Planning Scheme No. 17

Zoning (LPS17) : Regional Reserve – Primary Regional Road / Special Use

MRS: Reserved (Primary Regional Road / Public Purposes)

Works Approval Area: Sand Extraction Area A: 4.1 ha

Sand Extraction Area B: 9.4 ha

Total: 13.5 ha

The Subject land (the “Premises”) is located approximately 20 kilometres north-east of the Perth CBD, within the locality of Ellenbrook, in the City of Swan local government area.

The Subject land is located within the Perth – Darwin Highway Road alignment, as part of the NorthLink Central Section (NLCS) road construction project works.

Sand extraction area A is bounded by the Perth – Darwin Highway Road alignment to the east and west, regional bushland reserve to the north, and the Ellenbrook residential subdivision to the south.

Sand extraction area B is bounded by regional bushland reserve to the east and west, Maralla Road to the north, and the Ellenbrook residential subdivision to the south.

The areas identified have previously been cleared as part of road construction activities for NorthLink Central Section project works.

Sand is proposed to be extracted from two areas of significant cut within NLCS alignment to maintain appropriate road grades. The proposal does not over-extract sand, and all sand proposed to be utilised would otherwise be subject to earthworks cut to fill operations for NLCS.


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Figure 3-1a. Locality Plan for Subject Land.


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Figure 3-1b. Locality Plan for Subject Land.


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Figure 3-1c. Locality Plan for Subject Land.


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4. Application (‘Proposed Activities’)


4.1 Overview

In the northern section of the NLCS, the road alignment traverses two areas subject to significant cut to maintain appropriate road grades. The underlying sand represents a significant material resource, noting that the NLCS traverses and is in close proximity to the existing Hanson Silica sand mine site at Gaskell Avenue (Works Approval Licence L6752/1995/11).

This Application proposes to extract and screen sand from these areas as part of North Link Central Section (NLCS) Project works.

Approval is sought to screen the extracted sand by on-site screening and stockpiling of material.

This Application seeks a temporary approval of 1 year duration to screen sand at the subject site.

The operations and material stockpiling will occur on land within the NLCS road alignment, in areas previously cleared as part of Project works.

In summary, the current Application includes:

▪ Sand to be removed from two areas of significant cut within NLCS alignment to maintain appropriate road grades.

▪ Sand to be screened on site at approximately 1500 tonnes / day and stockpiled using stacker for lot conformance testing.

▪ Sand to be loaded out using wheeled loaders and transported offsite post compliance verification and testing (circa 1 month lead to provide adequate stockpiles for loadout).

▪ Proposal does not over-extract sand. All sand proposed to be utilised would otherwise be subject to earthworks cut to fill operations for NLCS if not used for manufacturing sand.

▪ Sand to be used by BGC Australia in manufacture of concrete, concrete noisewalls, asphalt and brickpavers for the NLCS project.

The expected quantity of sand screened and transported from site is:


▪ Sand Area B: approximately 300,000 m3 of manufacturing sand over approximately 45 weeks.

The screening operation would be conducted by Hanson Construction Materials Pty Ltd who have the experience and expertise in relation to screening operations, and notably experience with specific conditions expected to be expected at the site, given their operation of the adjacent Hanson Silica sand operation at Gaskell Avenue.

Sand Extraction Area A may not proceed depending on the timing of the Works Approval process and the construction schedule for the NLCS.


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Figure 4-1. Area Subject to Works Approval Application (Premises) - Sand Extraction Area A.


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Figure 4-2. Area Subject to Works Approval Application (Premises) - Sand Extraction Area B.


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Table 4-1. Sand Extraction Areas - General Description.

Area Operation

A Under this Application, this area will be used to screen sand material extracted from the significant cut in this area which forms part of the NLCS road works

The clearing of this area has previously been undertaken as part of NLCS construction works.

Stockpiles will be used to facilitate noise attenuation, together with any additional noise bunding (earth stock piles) to achieve noise abatement as required.

The existing nearby turkeys nest will be used for dust suppression purposes.

Area subject to Works Approval (Sand Extraction Area A): 4.1 ha.

B Under this Application, this area will be used to screen sand material extracted from the significant cut in this area which forms part of the NLCS road works

The clearing of this area has previously been undertaken as part of NLCS road works.

Stockpiles will be used to facilitate noise attenuation, together with any additional noise bunding (earth stock piles) to achieve noise abatement as required.

Noise walls which will buffer adjacent receptors are scheduled to be constructed in this area in the first quarter of 2018.

The existing nearby turkeys nest will be used for dust suppression purposes.

Area subject to Works Approval (Sand Extraction Area B): 9.4 ha

4.2 Justification

The proposed extraction area is within the NLCS road alignment. Sourcing materials close to NLS2 provides significant benefits to the WA community of shorter road haul routes, reduced traffic implications and reduced greenhouse gas emissions.

4.3 Previous Experience

4.3.1 Hanson Construction Materials Pty Ltd

Hanson Construction Materials Pty Ltd operates the sand mine site at the immediately adjacent Gaskell Avenue site (Works Approval Licence L6752/1995/11). Hanson's 530 hectare mine site at Gaskell Avenue is able to produce concrete sand, filling sand and high grade silica sands at an annual capacity in excess of 1,500,000 tonnes, with proven reserves in excess of 50 million tonnes. This site is in the Bassendean sand belt but has high dunes of deep pure white silica sand overlaying the cream material used in the production of concrete and filling sands. Concrete sand is either dry screened or washed depending on raw material quality. Silica sand is extensively processed into several different grades and either sold in bulk or further processed within the drying and screening plant located on the site. In January 2016, Hanson Construction Materials Pty Ltd purchased the site from Rocla Pty Ltd.

4.3.2 BGC Australia Pty Ltd

BGC operates a number of basic raw material facilities and holds Works Approval Licences for a number Category 12 facilities, including:

▪ BGC Voyager II quarry, Mundaring.


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▪ BGC Elazac quarry, Port Hedland.

▪ BGC Ravensthorpe quarry, Ravensthorpe.

BGC (Australia) P/L has held numerous Works Approvals / Licences with the Department of Water and Environment Regulation, including:

▪ L8415/2010/2 : BGC (Australia) P/L : Category 12 – Screening of material etc.



4.4 Summary of Proposed Activities

A summary of proposed primary activities that will be occurring at the Site include but are not limited to the following:

▪ Site setup;

▪ Material extraction;

▪ Transport of materials within site;

▪ Screening;

▪ Storage and stockpiling of processed materials onsite; and

▪ Transport of material offsite.

Infrastructure to be established as part of the proposal includes:

▪ Screening Pads;

▪ Stockpile Pads;

▪ Screens and Conveyor Stackers;

▪ HV/LV Haul Roads.

4.5 Cost of Proposed Development

The cost of the development work is estimated to be <$20,000. This cost is based on the following facilities having to be provided for the planned <1 year of operations:

▪ Establishment of internal access tracks, pads and stockpiling areas: <$20,000

The cost of the proposed development work does not include:

▪ Costs associated with obtaining approvals.

▪ Costs associated with actual screening operations.

▪ Costs of excavating material to be used in screening operations.

▪ Construction of required noise attenuation measures which already form part of NLCS works.

▪ Costs of Subcontracted works.


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Table 4-3. Summary of Proposed Activities.

Proposal Element Description

Life of proposal <1 year commencing January 2018 for this proposal.

Extraction Area Extraction of sand will only occur within the existing NLCS road alignment.

Works Approval Area: Sand Extraction Area A: 4.1 ha

Sand Extraction Area B: 9.4 ha

Total: 13.5 ha

Amount of material to be extracted

The expected quantity of sand screened and transported from site is:

Sand Area A: approximately 50,000 m3 of manufacturing sand over approximately 8 weeks.

Sand Area B: approximately 300,000 m3 of manufacturing sand over approximately 45 weeks.

Maximum depth of excavation

Operations are restricted to the approved designed levels for the NLCS road alignment.

Dewatering No dewatering will be required as part of the Application.

Sand extraction methodology

Sand will be extracted by way of wheeled loaders.

The detailed methodology for this process is outlined within the Project Construction Management Plan.

Sand processing after extraction

Sand will be excavated from the cut areas and transported to the mobile screening facility (Terex® Finlay 683 self-contained screening unit) and horizontal stacker unit.

Material from the screening operations will then be stockpiled on site.

The stockpiled material will be loaded by wheeled loaders (Komatsu WA 600 or equivalent) onto B-double trucks for transportation from the Premises.

The proposed processing plant capacity will be of the order 1500 metric tonnes per day.

Transport

Truck movements Truck types – Pocket Road Trains or B doubles will be used to transport sand from the Premises offsite.

Sand materials truck movements will be restricted to normal construction hours (Mon-Sat between 7am to 7pm, excluding public holidays).

Vehicle Access All truck movements to and from the Site will be via Gaskell Avenue which is also the dedicated access to the existing Hanson Construction Materials P/L sand operation.

Gaskell Avenue is an established heavy haulage route with dedicated truck turning onto Gnangara Road, along with existing staging and laydown areas.

Trucks / vehicles entering the Premises via the existing western entry/exit point from Gaskell Avenue.

Trucks / vehicles leaving the Premises will leave via the existing western entry/exit point from Gaskell Avenue.

No further modification is required.

Clearing

Clearing of native The areas required for the extraction, associated screening and stockpiling of the


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vegetation material have previously been cleared as part of NLCS Project works.

With regard to approval to clear native vegetation, the PDNH (Swan Valley Section) was subject to Public Environmental Review and approved by the Western Australian Minister for Environment in Ministerial Statement No.1036 (23rd September 2016), and a decision was made under sections 130(1) and 133 of the EPBC Act 1999 to approve the PDNH (Swan Valley Section), WA (EPBC 2013/7042) on 2nd of December 2016.

Water

Water requirements Dust suppression at screening locations and along access routes will be by means of watercarts and sprinklers/sprays.

Dust suppression on the main internal site access roads will be by means of water carts, and is already being undertaken as part of NLCS Project works. To minimise dust from the main circulation route through the site, dust minimisation applications will be reviewed as required. Higher watering frequencies will be adopted, as needed, during drier months of the year.

Water requirements for the operations will covered under existing Water Licences for NLCS Project works in this particular area:

DWER Groundwater Licence: GWL 200195(1) (Attachment 4).

Water supply source An existing turkeys nest developed for the NLCS exists and will utilised as a water resource. The turkey nest is located in close proximity to the extraction areas, and is immediately adjacent to Gaskell Avenue.

Construction water bores provide water to the turkey nest, and an existing monitoring bore network monitor any potential impacts associated with abstraction.

Infrastructure

Location All extraction and screening activities will be within the existing approved NLCS road alignment, in two areas designated Sand Extraction Area A and B.

Material from the screening operations will then be stockpiled on site.

Fuel Fuel will be distributed to individual items of plant via mobile tanker.

Workforce

Operations Existing temporary offices and amenities are located in close proximity at the GNC NLCS site compound on the east side of Gaskell Avenue.

Temporary ablution block toilets are provided at the site offices

Parking will be provided at the site office.

Hours of operation Overall extraction operations will be as per normal construction hours (7am to 7pm, Monday to Saturday, excluding public holidays), although works will be generally limited to 7am to 5pm.

Routine maintenance work occur within these timframes.

Transportation of sand material from the subject site would also be as per normal construction hours (7am to 7pm, Monday to Saturday, excluding public holidays), with works generally limited to 7am to 5pm.

Plant and Equipment

Construction During the construction and advance works packages the Premises shall be prepared for establishment of Crushing and Screening plant.

Onsite plant expected to be used for this stage shall include the following:

Wheeled Loaders; D8 Dozer; 40 tonne articulated dump truck, Watercart.


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Operations During normal operations onsite, plant expected to be used shall include the following:

Wheeled Loaders; 40T Articulated Dump Trucks; Watercart; Terex® Finlay 683 self-contained screening unit; Horizontal Deck Screens; Haulage B-doubles.

4.6 Clearing of Native Vegetation

The areas required for the extraction, associated screening and stockpiling of the material have previously been cleared as part of NLCS Project works.

With regard to approval to clear native vegetation, the PDNH (Swan Valley Section) was subject to Public Environmental Review and approved by the Western Australian Minister for Environment in Ministerial Statement No.1036 (23rd September 2016), and a decision was made under sections 130(1) and 133 of the EPBC Act 1999 to approve the PDNH (Swan Valley Section), WA (EPBC 2013/7042) on 2nd of December 2016 (Section 5 of Report).

4.7 Topsoil and Overburden Management

Topsoil and overburden removal within Sand Extraction Area A and B has occurred as part of NLCS Project works:

▪ Topsoil has been removed and stored for rehabilitation works which form part of NLCS Project works.

▪ Overburden will form part of cut to fill operations as part of NLCS Project works.

▪ Excavation will occur progressively.

4.8 Sand Extraction

Sand extraction at the subject site will be in accordance with relevant NLCS Project Management Plans and construction methodologies, and relevant Hanson and BGC procedures used on similar sites.

4.9 Screening

The sand from the extraction area will be screened on site utilising mobile screening equipment - Terex® Finlay 683 self-contained screening unit, in conjunction with a horizontal stacker unit (Figure 4-3). Activities will be coordinated with existing NLCS construction operations to address safety at all times.

The screening areas will operate in accordance with NLCS Project requirements and Approvals, and the GNC Environmental Management Plan and GNC Construction Noise and Vibration Management Plan are contained within Attachment 8 of this report.

Once material has been screened it will be stockpiled prior to transportation off site. Stockpiles will be managed to limit fugitive dust egress from the subject site. The various grade sized product will be loaded by wheeled loaders onto B-double trucks for transportation from the subject site. All loads exiting the subject site will be covered to prevent the egress of dust.


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4.10 Expected production

4.10.1 Maximum production capacity

The expected quantity of sand to screened and transported from site is restricted by the size of the sand resource at the two proposed locations. This is based on the limits of the cut for the road design at these locations.


▪ Sand Area B: approximately 300,000 m3 of manufacturing sand over approximately 45 weeks.

4.10.2 Processing throughput

Maximum processing throughput under operating hour restrictions is expected to be 1,500 tonnes / day.

Figure 4-3. Terex® Finlay 683 self-contained screening unit and horizontal stacker.

4.11 Transportation and Traffic Management

4.11.1 Site Access

Vehicles will enter the overall area from Gnangara Road along Gaskell Avenue, which is the dedicated access to the Hanson (Gaskell Avenue) Sand Mining Operation (Figure 3-1a).

Vehicles will enter the NLCS Project area from Gaskell Avenue along the construction corridor for the NLCS Project (Figure 4-4). No further modifications are proposed to the intersection of Gaskell Avenue and the subject site.


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4.11.2 Traffic Generation

The proposal will not substantially contribute to traffic generation along Gaskell Avenue which is a dedicated heavy haulage route for the existing Hanson Sand Operation.

4.11.3 Refuelling and Servicing / Maintenance

Refuelling of plant and equipment will occur on the subject site primarily via mobile tankers.

All major servicing of equipment will be conducted off-site, whilst onsite routine / minor maintenance will occur using dedicated trucks with oil and waste recovery systems. Regular inspections and maintenance of fuel, oil and hydraulic fluid in storages and lines will be carried out for wear or faults.

Refuelling and servicing / maintenance will be in accordance with strict requirements contained within the GNC Environmental Management Plan (Attachment 8), specifically the Environmental Risk Action Plan – Dangerous Goods, Hazardous Materials and Spill Management (Appendix 4, pp 145-155).

4.12 Closure and Rehabilitation Plan

The areas the subject of this Application (Sand Extraction Areas A and B) form part of the NorthLink Central Section road alignment. At the cessation of the proposed works for sand extraction and screening, these areas will be subject to road construction works.

A strip at the edge of project works will be subject to rehabilitation works. Rehabilitation will re-establish the landform, and topsoil will be placed as the top layer of the rehabilitated area which will allow the flora to re-establish in the area, visually returning the site to the existing form and in the long term creating an environment which is capable of sustaining flora and fauna.


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Figure 4-4. Access to NLCS Sand Extraction Areas A and B from Gaskell Avenue.


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5. Approvals, Permits and Licences


5.1 Existing Approvals

The major NLCS Approvals are contained within Attachment 4 of this Application. A summary of the Approvals and associated conditions for the NLCS Project is contained in Section 2 of the GNC Environmental Management Plan (Attachment 8).

▪ Environmental Protection Act, 1986 (WA)

The PDNH (Swan Valley Section) has been subject to Public Environmental Review and was approved by the Western Australian Minister for Environment under s45 of the EP Act in Ministerial Statement No.1036 (23rd September 2016).

▪ Environment Protection and Biodiversity Conservation Act, 1999 (C’wth)

A decision was made under sections 130(1) and 133 of the EPBC Act 1999 to approve the PDNH (Swan Valley Section) (EPBC 2013/7042) on 2nd of December 2016.

▪ Aboriginal Heritage Act, 1972 (WA)

Section 18 consent for the disturbance of Registered Aboriginal heritage sites within the PDE was submitted by Main Roads Western Australia (MRWA) under section 18(2) of the Aboriginal Heritage Act 1974 on the 4th of May 2016 and was approved on the 25th of November 2016.

▪ Rights in Water and Irrigation Act 1914 (WA)

Compliance with relevant provisions of the RIWI Act, including Licences to take water under s 5C, and Licences to construct or alter a well under s 26D of the RIWI Act.

6. Consultation

A detailed assessment of the extensive consultation undertaken as part of the NLCS is contained in Section 7.4 of the GNC Community and Stakeholder Engagement Plan, including but not limited to (Department names refer to those at the time of consultation):

Commonwealth:

▪ Department of Infrastructure and Regional Development

▪ Department of the Environment

▪ Treasury

▪ Infrastructure Australia

State:

▪ Department of Premier and Cabinet

▪ Department of Aboriginal Affairs

▪ Department of Environment Regulation (now DWER)

▪ Department of Fire and Emergency Services

▪ Department of Local Government and Communities


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▪ Department of Parks and Wildlife (now DBCA)

▪ Department of Planning

▪ Department of Transport

▪ Department of Water (now DWER).

▪ MainRoads WA.

Local:

▪ City of Swan

▪ City of Bayswater

▪ City of Wanneroo

▪ Eastern Metropolitan Regional Council (EMRC)

▪ WA Local Government Association

Groups / Community:

▪ South West Aboriginal Land and Sea Council (SWALSC)

▪ Traditional Owner Groups

▪ Community, Recreational, Environmental Groups, Businesses and Associations

▪ Community / nearby residents (100 m, 500 m, 1,000 m from Project boundary).

▪ There is also a ‘Community Reference Group’ associated with the NLCS which meets at least quarterly to discuss the Project and issues which may influence the broader community.

Figure 6-1. NLCS Community and Stakeholder Engagement.


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7. Site Investigations and Assessments


As part of the due diligence undertaken for the NLCS, a comprehensive suite of assessments have been undertaken. The outcomes of these investigations have informed the Project’s design and referral of relevant agencies for assessment.

8. Environmental Siting and Biophysical Description


8.1 Summary

The primary environmental factors in relation to the Subject land are summarised below with reference to DER Guidance Statement – Environmental Siting (DER, 2016).

8.2 Climate

The nearest Bureau of Meteorology (BoM) weather station at Pearce RAAF Research Station (Station No. 009053) provides average monthly climate statistics for the Upper Swan locality (Figure 8-1). Average annual rainfall recorded at Upper Swan since 1937 is 651.1 mm (BoM 2016). Rainfall may occur at any time of year; however, most occurs in winter in association with cold fronts from the southwest. Highest temperatures occur between December and March, with average monthly maximums ranging from 30.3°C in December to 33.5°C in January (BoM 2016). Lowest temperatures occur between June and September, with average monthly minimums ranging from 8.2°C in July and August to 9.4°C in June (BoM 2016). Winds and the seasonality of rainfall in the Perth region is a factor that influences stormwater, dust control and sediment, and erosion control management strategies. The Perth region experiences strong westerly winds or gales in winter and strong easterly winds and south-westerly sea breezes in summer.

Figure 8-1. Pearce RAAF historical weather averages (Source: Bureau of Meterology, 2016).


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8.3 Specified Ecosystems and Significant Natural Areas

It should be noted that the areas the subject of this Application have previously been cleared and established as part of works associated with NLCS construction works. Therefore, the comments below relate to any potential indirect impacts to specified ecosystems and natural areas.

8.3.1 Regional / Conservation Reserves

Reserve areas are located adjacent to the Subject Land, but the proposed activities are set-back from the boundary of the site and will not impact adjoining areas.

Sand extraction area A is bounded Nature Reserve to the north and Sand extraction area B is bounded by Nature Reserve to the east and west (Figure 8-2) (Attachment 7).

8.3.2 Bush Forever

The Government of Western Australia’s Bush Forever Policy is a strategic plan for conserving regionally significant bushland within the Swan Coastal Plain portion of the Perth Metropolitan Region. The objective of Bush Forever is to protect comprehensive representations of all original ecological communities by targeting a minimum of 10% of each vegetation complex for protection (Government of Western Australia 2000). Bush Forever Sites are representative of regional ecosystems and habitat and have a key role in the conservation of Perth’s biodiversity.

Sand extraction area A is bounded regional bushland reserve to the north and Sand extraction area B is bounded by regional bushland reserve to the east and west. These areas are also identified as Bush Forever sites (Figure 8-2).

8.3.3 Threatened Ecological Communities (TECS)

There are a number of Threatened and Priority Ecological Communities (TECS / PECS) in proximity to the Subject land associated with this Application (Figure 8-3).

8.4 Geology, Soils and Topography

The Swan Coastal Plain (SCP) consists of Pliocene to Quaternary sediments (collectively termed “superficial formations” which comprise Aeolian, alluvial, swamp, estuarine and shoreline sediments) that were deposited on a gently seaward-sloping unconformity surface on top of Mesozoic sedimentary rocks. The major dune systems, oriented in a north–south direction, transect the SCP. The Bassendean dunes are the oldest (Pleistocene), lowest and most leached of the series. To the west of the Bassendean dune system are the calcareous Quindalup dunes, the youngest unit. The superficial formations (i.e. sands, sandstone and limestone) support Perth’s two major aquifers: the Gnangara mound north of the Swan River, and the Jandakot mound south of the river.

8.5 Acid Sulfate Soils

Acid sulfate soils (ASS) are naturally occurring, iron-sulfide rich soils, sediments or organic substrates, formed under waterlogged conditions. If exposed to air, these sulfides can oxidise and release sulfuric acid and heavy metals. This process can occur due to drainage, or excavation.

The subject areas are not mapped as moderate to high risk of ASS (Attachment 7).


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Figure 8-2. Regional reserve areas in proximity to the Subject land.


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Figure 8-3. Threatened and Priority Ecological Communities in proximity to subject land (refer Attachment 8 – NLWA Public Environmental Review Document).


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8.6 Contamination

There are no contaminated sites in proximity to the Subject land (DWER Contaminated Sites database).

8.7 Groundwater

Groundwater levels at the Subject area at approximately 44-47 m AHD. Groundwater contours follow the natural topography of the Subject land (Attachment 7). The “proposal area(s)” will not intersect the water table.

Sand extraction area A is located within the Priority 3 (P3) zone of a Public Drinking Water Source Areas (Attachment 7), while Sand extraction area B is outside the PDWSA. The objective of PDWSAs, is to ensure that land use and development within PDWSAs is compatible with the protection and management of the public water supply.

No impacts to the PDWSA are anticipated from the proposed activities.

There is a significant monitoring bore network associated with the NLCS and in proximity to the Subject areas which is subject to monthly water quality assessment (Attachment 7, Figure 11).

8.8 Surface Water

There are no surface water features within the Subject areas.

8.9 Wetlands

Wetlands on the Swan Coastal Plain have been classified under the Department of Parks and Wildlife (DPAW) Geomorphic Wetlands Database based on the characteristics of landform and water permanence. DPAW has assigned wetland management categories based on their ecological, hydrological and geomorphological significance, taking into account the degree of disturbance that had occurred. The three Wetland Management Categories on the Swan Coastal Plain can be summarised as follows: Conservation Category (CC), Resource Enhancement (RE), and Mulitple Use (MU).

Review of the Geomorphic Wetlands of the Swan Coastal Plain dataset identified a number of CCWs in proximity to the subject land, but these will not be impacted by the proposed activities (Figure 8-4) (Attachment 7).

There are no nationally important or RAMSAR listed wetlands within or in close proximity to the Subject Land.

8.10 Vegetation and Flora

Refer to NLWA Public Environmental Review Document (Figure 8-5 and 8-6) (Attachment 8).

It should be noted that the areas the subject of this Application have previously been cleared and established as part of works associated with NLCS construction works. Therefore, it is only potential indirect impacts which are relevant.


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Figure 8-4. Vegetation associations in proximity to subject land (refer Attachment 8 – NLWA Public Environmental Review Document).


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Figure 8-5. Vegetation associations in proximity to subject land (refer Attachment 8 – NLWA Public Environmental Review Document).


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Figure 8-6. Vegetation condition in proximity to subject land (refer Attachment 8 – NLWA Public Environmental Review Document).


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Figure 8-7. Conservation significant flora in proximity to subject land (refer Attachment 8 – NLWA Public Environmental Review Document).


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Figure 8-8. Fauna habitat in proximity to subject land (refer Attachment 8 – NLWA Public Environmental Review Document).


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Figure 8-9. Black cockatoo habitat assessment in proximity to subject land (refer Attachment 8 – NLWA Public Environmental Review Document).


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8.11 Threatened and Priority Flora

Refer to NLWA Public Environmental Review Document (Figure 8-7) (Attachment 8).

Threatened and Priority Flora

There are a number of threatened and priority in proximity to the subject land.

Vegetation condition monitoring is conducted quarterly in accordance with Ministerial Statement 1036 for the NLCS (Attachment 4), therefore, any potential impacts to native vegetation and threatened and Priority flora adjoining the Subject land will be assessed as part of this ongoing monitoring. Dust deposition as a result of activities associated with this Application is a potential factor, however, this is assessed as part of ongoing weekly inspections and quarterly vegetation monitoring associated with the NLCS Project (Refer also GNC Flora and Vegetation Management Plan).

8.12 Significant Fauna Habitat

Refer to NLWA Public Environmental Review Document (Figure 8-8 and 8-9) (Attachment 8).

8.13 Aboriginal Heritage

The proposal will not impact any Registered Aboriginal Sites or Heritage Places. Heritage monitoring has been conducted during NLCS Project works.

8.14 Residential Receptors

There are neighbouring residential dwellings in proximity to proposed activities (Figure 4-1 and 4-2; Attachment 2). These are not expected to be significantly impacted by operations of the Premises. The primary risk factors associated with the proposed activities are potential

▪ Fugitive emissions (dust); and

▪ Noise emissions.

In addition to the management measures and controls outlined within this report and relevant Project management plans, a primary mechanism to mitigate potential impact to nearby sensitive receptors (residential dwellings), primarily at Sand Extraction Area B, is the scheduled installation of noise walls which in the first quarter of 2018. The noise walls are up to 5m in height and provide significant mitigation to noise and dust from the Subject land (Figure 8-9).

Noise from the subject site is not expected to adversely impact on the amenity of the locality.

With regard to dust, dust can be adequately managed having regarding to the proposals set out for dust management within the GNC Environmental Management Plan.

It is noted that construction within the northern section of the NLCS alignment has been ongoing since the first quarter of 2017, therefore, it is considered that there is an existing level of acceptance of construction related activity from the subject site.

Having regard to the management measures set out within this report it can be concluded that despite a restricted separation distance, proposed activities will not have a significant impact on the amenity of the locality and residences within the vicinity of the subject site.


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Figure 8-9. Indicative noise wall as constructed along Reid Hwy in the NLCS by GNCJV.

9. Environmental Risks and Management

Refer also to Part 6 of Application and Attachment 8.

The following plans have been developed and apply to the Works and will ensure the Project does not result in adverse impacts on environmental receptors in the vicinity of the Application area:

▪ GNC Environmental Management Plan (Attachment 8).

▪ GNC Noise and Vibration Management Plan (Attachment 8).

9.1 Fugitive Emissions – Dust

Management of dust generation and emission for the NLCS is outlined in the GNC Environmental Management Plan (Attachment 8), specifically the Environmental Risk Action Plan – Air Quality and Dust Management (Appendix 4, pp 141-145). Dust is currently being managed throughout the NLCS, including for bulk earthworks within the project area.

The expectation is that emissions are unlikely to adversely affect the area’s environmental values or the health, welfare and amenity of neighbouring residences. The objective of ensuring that emissions from construction works do not adversely affect environmental values or the health, welfare and amenity of people and land uses will be met through managing potentially adverse construction and operation impacts as per the GNC Environmental Management Plan (EMP).


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9.1.1 Emission Description

Airborne dust has the potential to be generated from the following activities associated with the Proposal:

▪ Mechanical extraction of the sand material.

▪ Transport of sand to the screening facilities.

▪ Screening operations.

▪ Transport of material from screen locations to stockpiles.

▪ Loading of sand materials to export from the subject site.

9.1.2 Emission Control

The GNC Environmental Management Plan (Attachment 8) provides for a range of management measures to control the potential for dust egress from the subject site. Management measures to be implemented with the proposed activities include:

▪ Multiple water trucks (35,000L Moxy) on site at all times to conduct dust suppression associated with proposed activities (extraction, screening, transport of material).

▪ Access roads will be constructed of crushed limestone and well maintained.

▪ To minimise dust from the main circulation route through the sites, internal roads will be subject to dust suppression by means of water carts.

▪ A speed limit in trafficable areas, with vehicle speeds reduced where necessary to minimise dust emissions. On site signage will be utilised to reinforce on site speed limits.

▪ Vehicles will remain within designated roads and park only in allocated areas.

▪ Screening activities located in topographic low points with stockpiles used as windbreaks.

▪ Material drop heights between loaders and trucks, and trucks to stockpiles, will be kept to the minimum practical height.

▪ Truck loads will be covered to ensure no dust is generated during transport.

▪ Bunds used for acoustic screening will assist in trapping fugitive dust.

▪ Noise walls adjoining the NLCS will significantly mitigate dust impacts to adjoining receptors.

▪ A polymer based spray-on soil stabilizer will be applied to areas within the subject site as required.

▪ Dust suppressant additives or methods that reduce overall water consumption will be considered wherever practicable.

▪ Higher watering frequencies will be adopted, as needed, during drier months of the year.

▪ Workforce inductions include information in relation to the minimisation of dust. Toolbox and awareness sessions to be conducted on air quality/dust and mitigation measures.

▪ Weather conditions (obtained from Bureau of Meteorology) will be included in daily pre-start meeting.

▪ Activities with high dust generating potential will not be undertaken during adverse weather conditions.

▪ A ground water licence for extraction of water from the subject site has been obtained from the Department of Water and Environmental Regulation to assist in dust suppression.


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9.1.3 Emission Monitoring

▪ Baseline dust monitoring has been carried out ahead of commencement of operations. Dust Monitoring will continue throughout the duration of operations.

▪ Multiple dust monitors are located in the vicinity of proposed activities. Up to 12 (twelve) Dustraks will measure the amount of particulates (PM10) in air at a given time. As outlined in the DWER's NEPM (Ambient Air Quality), 2003 guidelines, an action level of 50µg/m3 will be used as a trigger level to implement further dust control measures. Exceedances/ incidents will be recorded and actioned if 50ug/m3 is an average over a 24 hour period (0000 hrs to 2359 hrs of the same day).

▪ Suitably qualified personnel to establish air monitoring (Dustraks) - fixed stations fitted with telemetry to relay live monitoring and alerts at boundaries nearby sensitive receptors.

▪ Visual monitoring of dust at all times by operational personnel, supervision and GNCJV personnel, also monitored during general site inspections (daily and weekly inspections).

Figure 9-1. Indicative noise and vibration, and dust monitoring locations currently in proximity to Sand Extraction Area A conducted by GNCJV.


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Table 9-1. GNC Environmental Management Plan (EMP) Environmental Risk Action Plan – Air Quality and Dust Management (Appendix 4).

1. Air Quality and Dust Environmental Risk Action Plan

Scope and receiving environment

Road commuters, residential developments, pedestrian walkways, recreation spaces, businesses and sensitive environmental areas are located in close vicinity of the Project. These receptors may be impacted by uncontrolled air emissions including dust, diesel exhaust/ greenhouse gases and associated odours generated during the construction phase.

The volume and duration of dust emissions are expected to be highest in the earlier stages of the Project during ground engaging works and in dry weather conditions. Potential impacts should decrease as the Project develops (i.e. once earthworks are completed) and in wet weather conditions. Controls will be implemented with forward planning to manage; emissions from site where nuisance dust could occur, in regards to the running of plant and machinery and the release of offensive odours to receptors.

This ERAP will outline the controls used to mitigate dust and other gas emissions in addition to monitoring dust emissions at boundaries nearby to receptors so to effectively manage impacts to the workforce, public, adjacent roads, visual amenity and the environment.

The key dust generating sources within the Project include:

Earthworks and excavations

Soil and fill material transfer from truck to stockpile, stockpile to footprint, and if applicable on public roads.

Wind erosion of stockpiled materials

Vehicular movements on unsealed roads and

Human movements on unsealed pathways.

Other air quality concerns are likely to originate from:

Machinery, vehicles and plant/ equipment

Storage of waste or materials

This ERAP is a living document and will be updated as required where scope of works are amended or where a subsequent risk is identified.

Note: this ERAP does not include asbestos; refer to Attachment 3.1 Asbestos-in-Soil Management Plan of Appendix 26, Contaminated Sites Management Plan or Unexpected Finds Protocol in Section 16.9 of this Plan.

Objective Mitigate dust generation and other air emissions to minimise impacts to the workforce, public, roads, visual amenity and environmental receptors using the Project's controls and management strategies.

Legal, contractual and other requirements

Legislation/regulations

▪ Environmental Protection and Biodiversity Conservation Act 1999 (Cwth)

▪ Environmental Protection Act 1986

▪ Environmental Protection Regulations 1987

▪ Environmental Protection (Unauthorised Discharges) Regulations 2004.

▪ Ministerial Statement No. 1036

▪ Occupational Safety and Health Act 1984

▪ Occupational Safety and Health Regulations 1996

Technical guidelines

DWER’s Guideline for Managing the Impacts of Dust and Associated Contaminants from Land Development Sites, Contaminated Site Remediation and other Related Activities (2011)

Australian New Zealand Standard 3580: Methods for Sampling and Analysis of Ambient Air (including Australian New Zealand Standard 3580: Methods for Sampling and Analysis of Ambient Air (including 3580.9.7 Determination of Suspended Particulate Matter Dichotomous Sampler (PM 10, course PM and PM 2.5) - Gravimetric Method)

DWER’s National Environment Protection (Ambient Air Quality) Measure for PM 10, 2003

National Environment Protection (Assessment of Site Contamination) Measure 1999


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Contractor requirements/documents

▪ SWTC Contract 20/15

▪ Appendix 32 of the SWTC

▪ PDNH Flora and Vegetation – Construction Condition Environmental Management Plan (NLWA-03-EN-RP-0051)

GNC Plans

▪ Appendix 22, Water Quality, Erosion and Sedimentation Control Management Plan

Site specific planning, approval conditions and licence conditions

No licensing or approvals required

Reid - Malaga Project Area Environmental Conditions (Appendix 32):

Temporary fencing 2.2 m high must be constructed adjacent to and within construction areas adjacent to Lightning Swamp. This fencing is to be covered in sheeting to minimise dust impacts to adjacent vegetation.

Targets No valid dust or air emission complaints resulting from construction works

Nil occurrence of unreasonable dust emissions

Nil occurrence of unreasonable release of contaminant (exhaust/ fumes etc.) or prescribed contaminant into the air

Responsibilities Project Environmental Coordinators

Deliver environmental awareness training on impacts of dust generation and other impacting gases

▪ Monitor dust and other generation/gas generating activities

▪ Monitor and assess dust suppression effectiveness

▪ Monitor servicing and pre-start machinery checks

▪ Investigate and prepare incident reports

All employees on-site

▪ To be developed post contract award

Controls & Management Strategies

Implement Appendix 22, Water Quality, Erosion and Sedimentation Control Management Plan

Refer to Section 4.11(h) of the SWTC – Temporary Revegetation and Landscaping Works:

Undertake temporary Revegetation and Landscaping Works as soon as final earthworks are complete in any given work lot within the Site to meet the soil erosion requirements of clause 3.11 and the dust control requirements of clause 9.6(m)

Temporary soil erosion control measures must be provided for all bare soil areas and batter slopes that may be at risk of soil erosion before any Revegetation of Landscaping Works are scheduled to begin

The temporary Revegetation and Landscaping Works must prevent any gravel, sand, silt or clay being moved by wind or rain, or disturbance by movement of machinery, plant or personnel until such time as the permanent Revegetation and Landscaping Works are undertaken and completed.

Refer to Section 9.6(m) of the SWTC – Dust:

Employ construction methods which will keep dust to a minimum particularly near residences, and which comply with the relevant Department of Water and Environment Regulation guidelines and OSH Law;

Treat areas of the Site exposed by clearing works with Dustex (or similarly approved stabilisation product), if no construction activities are occurring within the area for more than two weeks;

Treat cut and fill batters prior to Revegetation and Landscaping Works with Dustex (or similarly approved stabilisation product), to reduce any dust impacts;

Provide for the cleaning and keeping clean of roads, streets and other areas on or immediately adjacent to the Site as a result of the carrying out of the Project Works (including the use of street sweepers with traffic management as required);

Implement procedures to prevent soil from being deposited outside the Site;


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Implement procedures to ensure soil is not displaced through the action of strong winds during and after construction;

Damp down or cover loads being transported to or from the Site where wind-blown material may cause nuisance or become a traffic hazard;

Implement temporary landscape treatments during construction to cover areas of ground disturbed by clearing, excavation and stockpiling of material; and

Undertake dust monitoring to confirm compliance with clause 9.6(m)(i) if complaints are received from residents.

General Controls

Induct personnel and conduct Toolbox and awareness on air quality/dust and mitigation measures

Include weather conditions (obtained from Bureau of Meteorology) in daily pre-start meeting

Suitably qualified personnel to establish air monitoring (Dustraks) - fixed stations fitted with telemetry to relay live monitoring and alerts at boundaries nearby sensitive receptors

Up to 12 (twelve) Dustraks will measure the amount of particulates (PM10) in air at a given time. As outlined in the DWER’s NEPM (Ambient Air Quality), 2003 guidelines, an action level of 50µg/m

3 will be used as a trigger level to implement further dust control measures.

Exceedances/ incidents will be recorded and actioned if 50ug/m3 is an average over a 24 hour

period (0000 hrs to 2359 hrs of the same day)

If required implement Unexpected Finds Procedure in Section 16.9 of this Plan. This will include; testing and classifying excavated material against the Assessment levels for Soil, Sediment and Water, Contaminated Sites Management Series December 2014 and Landfill Waste Classification and Waste Definitions 1996, and excavation procedure/controls required

Laboratory analyses conducted by a NATA-accredited laboratory

Vehicles on-site to keep within site speed limits

Vehicles, plant and machinery to follow designated haul roads and access roads at all times and park in allocated areas

Water trucks are to conduct dust suppression in conditions where dust lift-off can occur. Dust suppression will be undertaken more frequently during hotter and drier conditions to control dust generation from site and project works.

Earthworks, stockpiles and bare work areas that are not stabilised to receive dust minimisation measures throughout works i.e. water truck suppression.

Where Dustraks relay increased levels, water trucks will be directed to the area

Specific stockpiles to receive Hydromulch coating or covering by geotextile material i.e. if left for periods greater than six weeks or as directed

Stop works in conditions where dust suppression is not halting visible dust movement

Street sweeper truck to be available on request to remove excess dust deposited onto public roads

Complaints investigated and recorded

Conduct weekly environmental inspections.

Excessive exhaust emissions

Operators to undertake daily pre-starts to ensure that vehicles, plant and machinery are running efficiently

Servicing of vehicles must be achieved at all times and in a case where a vehicle or plant is overdue for service, it should be tagged out of operation until a service has been conducted

Contingency and Corrective Actions

In the event of an incident or non-compliance these contingency measures and corrective actions will be followed to reduce impacts to the workforce, public, roads, visual amenity or environmental receptor.

Trigger Contingency/Corrective Action

Air quality exceeds trigger value Identify source


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Increase controls and management depending on severity of exceedance and potential for continued re-offense i.e. dust suppression, servicing or more permanent measures

Rectify where possible e.g. street sweeper

Air quality exceeds trigger value over a 24hr period (0000hrs to 0000hrs)

Investigate and complete incident investigation to identify source

Where possible change or modify work practice (corrective action)

Increase controls to avoid re-offense e.g. more permanent measures of mitigating air quality

Consider more water trucks operating on-site

Complaint made by community with regards to dust emissions or air quality

Investigate complaint

Increase controls to avoid re-offense e.g. more permanent measures of mitigating air quality

Where practicable modify work activities to fit conditions

Timeframe Duration of site works

Monitoring and Reporting

Monitoring

Daily and Weekly Inspections:

Weekly Environmental Inspection E-T-8-1227

▪ Visual dust inspections conducted continually and look for changes from previous day

▪ Dustraks will continually monitor and results include live data will be available online

▪ Inspect vehicle adherence to speed limits, established roads and access points

Monitor the dust suppression being applied to soil and stockpiles, as well as loads traversing Project access roads

▪ Inspect machinery pre-start checks, servicing history and visual vehicle emissions

Note: During windy conditions monitoring may be required more frequently in some areas undertaking high dust generating activities.

Reporting

▪ Weekly Environmental Inspection Checklist – E-T-8-1227

▪ Project Corrective Action Register –E-T-8-0116

▪ Monthly Environmental Report

▪ Vehicle Daily Pre-start Checklist – E-T-8-0501a and E-T-8-0501b

▪ Daily Pre-task Meeting Records – E-T-8-0916

▪ Complaints Register

▪ Environmental Incident Complaint Report – E-T-8-1222

▪ IMPACT

▪ Main Roads Environmental Incident Report Form

9.2 Noise and Vibration

A Noise and Vibration Assessment, including construction, has been completed for the NLCS (Attachment 8: NLWA Condition Environmental Management Plan - Amenity Noise).

A Construction Noise and Vibration Management Plan has been prepared by GNCJV for Project works (Attachment 8).


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9.2.1 Emission Description

The proposed operation will generate some noise as a result of:

▪ the operation of earthmoving equipment, primarily associated with the extraction of material from the excavation area;

▪ the processing (screening) of extracted materials;

▪ vehicle movements associated with the operation of the proposal.

It should be noted, however, that bulk earthworks involving HV equipment (scrapers, articulated dump trucks, wheeled loaders, water carts, dozers etc) are currently already occurring within the NLCS alignment including through sand extraction areas A and B.

There is some level of acceptance of the construction activity within the NLCS as a result of the works which have been ongoing. Significant noise impacts are not expected from the operations.

Disturbance from vibration at receptors is also expected to be minimal as no blasting is proposed. Noise and vibration monitoring is ongoing within the NLCS (refer Figure 9-1).

9.2.2 Ambient Noise Monitoring - Existing Noise Levels

As per the Draft Guidelines on Environmental Noise for Prescribed Premises (released in May 2016), and as a requirement of Ministerial Statement 1036, continuous noise monitoring has been conducted to establish the ambient noise levels (Attachment 8: NLWA Condition Environmental Management Plan - Amenity Noise). Noise and vibration monitoring is ongoing within the NLCS (Figure 9-1) (GNC Noise and Vibration Management Plan, Attachment 8).

9.2.3 Emission Control

Best practice design and noise management will be used to minimise impacts to amenity to adjacent residential receptors. Specific noise management measures include:

▪ Noise walls associated with the NLCS Project works will be constructed in the first quarter of 2018 (Figure 9-2).

▪ Equipment and plant will be positioned in topographical low points.

▪ Stockpiles will be located and bunds constructed (where required) to provide noise suppression between adjacent receptors.

▪ A buffer will be maintained between the proposed activities and the residential properties on the boundary of the NLCS.

▪ The screening plant and excavation area will be located behind stockpiles to reduce noise impacts.

▪ All mobile equipment will be maintained with efficient mufflers and noise shielding devices.

▪ Mobile equipment without audible reversing alarms will be utilised where possible (i.e. low frequency reversing alarms will be used).

▪ All personnel will be provided with appropriate noise protection equipment and will be inducted on safe work practices.

In addition to the specific management measures above, the management practices listed below will be implemented on the Project to minimise noise impacts on the surrounding residences, and to address the requirements for the implementation of reasonable and feasible measures for the


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duration of the work. The noise controls listed below are consistent with AS 2436-2010 Guide to Noise Control on Construction, Maintenance and Demolition Sites and the SWTC.

▪ All construction works will be carried out within approved construction hours of 0700 hours to 1900 hours from Monday to Saturday (except public holidays), unless approved in a separate Out of Hours CNVMP.

▪ All construction work will be carried out in accordance with environmental noise control practices set out in Section 4.5 of AS 2436-2010 Guide to Noise Control on Construction, Maintenance and Demolition Sites.

▪ All public complaints shall be recorded and investigated.

▪ High noise generating works will be staggered where possible to minimise noise impacts.

▪ Where practicable, excessively noisy processes will be substituted with alternative processes.

▪ Temporary acoustic fencing/barriers around noise intensive equipment/sites will be considered to mitigate high level off-site noise levels.

▪ Plant and equipment will be located away from noise and vibration sensitive areas as far as practicable.

▪ All ‘warm-up’ of equipment by employees and contractors arriving to site will be conducted during approved site construction hours.

▪ Generators, machinery and vehicles are to be switched off when not in use.

▪ In selecting plant and equipment for construction works, preference will be given to those which minimise noise and vibration.

▪ Plant, machinery and vehicle reversing alarms will be broadband alarm type where required.

▪ All plant will be maintained in accordance with the manufacturer’s requirements.

▪ Maintain vehicle, plant, equipment maintenance schedules and lubrication as per manufacturers' specifications.

▪ Regular checks (additional to scheduled maintenance) are to be undertaken to ensure all equipment and vehicles are in good working order and are being operated correctly (i.e. Daily Vehicle Daily Pre-start Checklist – E-T-8-0501a and E-T-8-0501b). Checklist includes:

Engine cover condition;

Defective silencing equipment;

Rattling components; and

Leakages in compressed air lines.

▪ Operators will use the daily pre-starts to carry out maintenance checks.

▪ Toolbox and pre-start meetings on noise management requirements, sensitive receivers and measures will be completed during the project. Speed limits and approved access roads will also be addressed during these meetings.

▪ Environmental Toolboxes and pre-start briefings will be conducted, and work crews informed of the impacts of noise. These will work simultaneously with measures for reducing noise. Operators of construction equipment will be made aware of the potential noise issues as well as ways to minimise noise emission.

▪ Site vehicles to adhere to speed limits throughout the Project.

▪ GNC vehicle movements will be restricted to approved access roads.


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▪ Behavioural practices to be enforced, i.e.; no swearing or unnecessary shouting or loud stereos/radios on site. No dropping of materials from height, throwing of metal items and slamming of doors.

With the implementation of the above noise control measures, the proposal complies with relevant legislation and regulation.

Figure 9-2. NLCS Noise wall location in relation to Sand extraction area B.


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9.2.4 Enquires, complaints, commendations

All complaints shall be handled in accordance with the GNC Community and Stakeholder Engagement Plan. Where a noise or vibration complaint is received, the GNC shall respond to the complainant within 24 hours of its submission. The complaint will also be recorded in the GNC’s Public Complaints Register and Connect, which is MRWA’s Customer Relationship Management system (refer to Table 6 below regarding noise and vibration complaints and contingency actions).

Where a complaint is identified as being a direct result of a non-conformance or incident, the procedure outlined below will be followed to allow GNC to identify and amend existing procedures and implement appropriate actions.

Potential contingencies include but are not limited to the actions outlined in Table 7. Where the contingency actions do not resolve the issue, MRWA are to be notified as per Section 5.

Table 9-2. Noise and vibration complaint contingency actions.

Complaint type Contingency Actions

Noise complaint is received Record complaint in Complaints Register and Connect

Investigate and identify source of noise levels

Assess location of noise monitors and need for additional monitoring near origin of complaint

Respond to complainant and report within 24 hours

Modify the methodology, employ controls i.e. screens, substitute the source of the noise, or stage the works at less disruptive hours of work

Vibration complaint is received Record complaint in Complaints Register and Connect

Investigate and identify source of vibration levels

Assess location of vibration monitors

Respond to complainant and report within 24 hours

Request vibration monitoring with landowner at complaint origin

Modify the methodology, employ controls i.e. dampeners/buffers, substitute the source of the vibration i.e. higher hertz or smaller machinery, or stage the works at less disruptive hours of work

9.2.5 Non-conformance, incident and corrective action

Where monitoring confirms noise levels or vibration limit action criteria are exceeded, GNC shall investigate the cause of the exceedance. Where vibration limits are reached, GNC shall complete a record of an incident (refer to GNC incident classifications in Section 18 of the GNC EMP). If noise levels are exceeded at a monitoring location this will be recorded as a non-conformance. Where confirmation is possible using additional monitoring above or reasonably extrapolated to within a residential dwelling or business premise, the exceedance will be recorded as an incident.

All contingency actions taken will be recorded in IMPACT (incidents) and the corrective action register (non-conformances). Typical responses to noise or vibration exceedances are located below.

In addition to Project induction, issues with noise and vibration compliance will be included in daily pre-starts and environmental Toolboxes to raise awareness and educate the Project team.


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Table 9-3. Noise and vibration action criteria exceedance contingency actions.

Exceedance Contingency Actions

Noise limit Investigate, identify and review source of noise levels

Record complaint in IMPACT

Modify the methodology, employ controls i.e. screens, substitute the source of the noise, or stage the works at less disruptive hours of work

Assess location of noise monitors and potential for additional monitoring

Vibration limit Investigate identify and review source of vibration levels

Assess location of vibration monitors

Modify the methodology, employ controls i.e. dampeners/buffers, substitute the source of the vibration i.e. higher hertz or smaller machinery, or stage the works at less disruptive hours of work

9.3 Surface Water

The GNC Environmental Management Plan (EMP) specifies measures to ensure water quality is not impacted during works, including erosion and storm water management.

9.4 Groundwater

The following key management actions will be implemented to ensure the works do not result in any adverse impacts, either directly or indirectly to groundwater resources:

▪ Consult and obtain the necessary approvals from the appropriate regulatory authorities (Department of Water). A ground water extraction licence is proposed to be applied for to extract groundwater for dust suppression.

▪ Extraction activities are not proposed to intercept groundwater.

▪ Groundwater will be managed in accordance with the GNC Environmental Management Plan (EMP) and relevant sub-plans.

▪ Monitoring of groundwater prior to, during and post construction activities will be undertaken (where required) to ensure management measures are effectively implemented and that there are no substantive impacts to the environment.

9.5 Vegetation and Flora

The development of the site will not require clearing of vegetation, which has previously occurred as part of NLCS Project works.

Indirect impact to vegetation and flora associated with fugitive dust emissions will be minimised as a result of proposed management measures and controls.

9.6 Dieback Management

Dieback management is contained within the GNC Environmental Management Plan and GNC Soil Hygiene Management Plan for the subject site (Attachment 8).


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9.7 Weed Management

Weed management is contained within the GNC Environmental Management Plan for the subject site (Attachment 8).

The management of weeds will employ the following principles:

▪ All vehicles and equipment to be used during site preparation, excavation and closure will be cleaned and free from soil or plant material when arriving at site.

▪ Vehicles are to be prohibited from entering remnant vegetation, apart from normal travel along made firebreaks and maintenance activities.

▪ Illegally dumped rubbish is a major source of weeds and is to be removed promptly.

▪ No weed contaminated or suspect soil or plant material is to be brought onto the site.

▪ Declared weeds or environmental weeds should be controlled promptly by digging out or spraying.

▪ Ongoing monitoring of weeds should be undertaken at least annually in autumn, prior to winter rains.

▪ All materials to be used in revegetation will be sourced from certified weed free locations and businesses.

9.8 Acid sulphate soils

The management of ASS, if encountered, will be undertaken in accordance with the GNC Environmental Management Plan (EMP) and relevant sub-plans and established DWER guidelines.

9.9 Aboriginal Heritage

The following key management actions will continue to be implemented to ensure the works do not result in any adverse impacts, either directly or indirectly to Aboriginal heritage:

▪ Ongoing consultation with relevant stakeholders.

▪ Inductions for construction personnel will include Aboriginal heritage awareness.

▪ Cease construction works should any skeletal material or Aboriginal artefacts be encountered.

▪ If Aboriginal artefacts are uncovered, the Department of Aboriginal Affairs (DAA) and relevant stakeholders will be contacted and construction works will cease

▪ If skeletal material is uncovered, the police and DAA will be contacted and all works ceased until clearance is given. If the remains are determined to be of Aboriginal origin, the DAA and relevant stakeholders will be consulted on management of the remains.

9.10 Bushfire

The proposed extraction activities will occur within the existing NLCS road alignment in which there is no remaining vegetation.


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10. Community Engagement

GNCJV have a dedicated Stakeholder and Community Engagement team in place to manage community engagement for the Project.

GNCJV have developed a Community and Stakeholder Engagement Plan (CSEP) which describes the strategies, processes and implementation for engaging with NLS2 project stakeholders and community.

The CSEP is a practical, implementable and auditable tool, designed to facilitate community and stakeholder engagement and the timely flow of information during the construction delivery stages of the NLS2 project.

All enquires, complaints, commendations complaints received from the public are dealt with according to the processes outlined in:

▪ GNC Environmental Management Plan (Attachment 8).

▪ GNC Community and Stakeholder Engagement Plan.

The outline of the process is reviewed under Section 9.2.4 and 9.2.5 of this Application.

11. Conclusion

Northlink WA (Stage 2) is the central component of the Northlink WA Project which will provide a vital, state of the art transport link between Morley and Muchea. It will reduce travel times and congestion, and provide significant productivity benefits to the economy, industry, motorists and local communities.

The proposal as set out in this report is a component of the construction program, and is consistent with the environmental and planning framework that applies to the Subject Land.

This Application proposes to screen sand material from the existing NLCS road alignment. The material excavated is proposed to be screened on site to for subsequent use in the construction of NLCS. The works are temporary and will occur across < 55 weeks.

To support this Application, a range of assessment, reports and approvals have been undertaken. These detail that the proposed excavation and processing of sand on the subject site can occur in a manner that is not detrimental to the amenity of the locality or environmental attributes of the subject site or adjoining areas.

It should be acknowledged that the subject site is currently subject to road construction works and as such there is acceptance of the use of the subject site for construction purposes.

The Subject areas will eventually form part of the NLCS road alignment, which includes a progressive rehabilitation program.

It is requested that Approval is granted for the works as set out in this Works Approval Application.

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