Environment Construction Method Statement #6...Environment Construction Method Statement #6 Mine Void Drilling and Grouting HEA-CMS-GL-ENV-006-00-01 Scope This Construction Method

Environment Construction Method Statement #6

Mine Void Drilling and Grouting

HEA-CMS-GL-ENV-006-00-01

Scope This Construction Method Statement describes the environmental management measures to be applied to mine void drilling and grouting activities.

Location/s Viaducts, Minmi Creek and F3 Interchange

Timing Pre-construction and construction

Minister’s COAs MCoA 30

Hunter Expressway Alliance

ECMS – Mine Void Drilling and Grouting

HEA-CMS-GL-ENV-006-00-01_Minevoids.Doc Page ii

DOCUMENT CONTROL

Document Type: Document No/Ref: HEA-CMS-GL-ENV-006-00-01

Title: Mine Void Drilling and Grouting

General Description:

This ECMS covers the activities and management measures for mine void treatment sites for the construction of a 13 km expressway from the Newcastle Link Road interchange with the F3, through to Buchanan.

Document Path: \\10.10.25.35\Data\HEA\01 Environment\01_09_ECMS\06_Mine_Void\Workingdocs\HEA-CMS-GL-ENV-006-00-01_Minevoids.Doc

Approval Name Position Signed/Approved Date

Document Editor / Author

Andrea Zambolt Senior Environmental Officer

Review Howard Chemney Environment Manager

Final approval Peter Chatburn Alliance Project Director

DOCUMENT REVISIONS

Rev Date Prepared by Reviewed by Approved by Remarks

01 17.09.10 A. Zambolt T. Doczy P. Chatburn

EMR Certification

I have reviewed this ECMS and find it to be in accordance with the relevant Conditions of Approval and all relevant undertakings made in the EIS, Representations Report and the approved CEMP.

Signed:

Environmental Management Representative

Date:



HEA-CMS-GL-ENV-006-00-01_Minevoids.Doc Page iii

Table of Contents

1 Introduction .................................................................................................................................1

1.1 ECMS overview ...................................................................................................................1

1.2 Key reference documents to ECMS .....................................................................................2

1.2.1 Additional relevant references ......................................................................................3

2 Scope of works............................................................................................................................4

2.1 Clearing and access ............................................................................................................7

2.1.1 Access tracks ...............................................................................................................7

2.1.2 Construction pads ........................................................................................................7

2.2 Drilling .................................................................................................................................8

2.2.1 Drilling equipment ........................................................................................................8

2.2.2 Drilling methods ...........................................................................................................8

2.2.3 Water use ....................................................................................................................8

2.2.4 Spoil management .......................................................................................................9

2.2.5 Investigation of mine drill hole and mine voids ..............................................................9

2.3 Grouting ..............................................................................................................................9

2.3.1 Supply of grout batch plant ...........................................................................................9

2.3.2 Mobilise and demobilise grout batch plant .................................................................. 10

2.4 Materials ............................................................................................................................ 10

2.4.1 Material supply ........................................................................................................... 10

2.4.2 Grout mix ................................................................................................................... 10

2.5 Delivery of grout from batch plant to grout pump ................................................................ 11

2.5.1 Pumping of grout into mine void ................................................................................. 11

2.5.2 Clearing blocked injection lines .................................................................................. 11

2.5.3 Disposal of excess grout ............................................................................................ 11

2.6 Hours of operation ............................................................................................................. 12

2.7 Site rehabilitation and restoration ....................................................................................... 12

3 Key roles and responsibilities .................................................................................................... 13

4 Statutory requirements and approvals ....................................................................................... 14

4.1 Revision of ECMS to reflect licence conditions ................................................................... 14

4.2 ECMS consultation process ............................................................................................... 14

4.3 Minister’s Conditions of Approval ....................................................................................... 15

5 Site induction and training ......................................................................................................... 18



HEA-CMS-GL-ENV-006-00-01_Minevoids.Doc Page iv

6 Monitoring and inspection .......................................................................................................... 18

7 Revisions .................................................................................................................................. 18

8 Document control ...................................................................................................................... 18

9 Attachments .............................................................................................................................. 19

Attachment A .......................................................................................................................................

Environmental Construction Method Statement Environmental Control Plans ...................................

Attachment B .......................................................................................................................................

Diagrammatic representation of drilling and grout filling activities ......................................................

Attachment C .......................................................................................................................................

Grouting Spill Procedure ..................................................................................................................

List of Figures

Figure 2.1: Extent of mine voids within the project area ..................................................................5

Figure 2.2: Typical drilling equipment. ............................................................................................8

Figure 2.3: Diagrammatic representation of likely batch plant for the project ...................................9

Figure 2.4: Testing of the stiff grout to ensure the correct consistency. ......................................... 10

LIST OF TABLES

Table 1.1: Relevant sub-plans to the ECMS ..................................................................................2

Table 4.1: Legislation and statutory obligations ........................................................................... 14

Table 4.2: Matrix of Minister’s Condition of Approval 30 .............................................................. 15



HEA-CMS-GL-ENV-006-00-01_Minevoids.Doc Page | 1

1 Introduction This Environmental Construction Method Statement (ECMS) documents the requirements for works associated with mine void drilling and grouting. This document:

addresses the requirements of the Minister’s Condition of Approval 30 for the Hunter Expressway project,

reflects the requirements of the Hunter Expressway Alliance (HEA) environmental management system (as detailed in the Construction Framework Environmental Management Plan),

incorporates the management measures from the relevant sub-plans and

describes the environmental management measures relating specifically to the construction activities and potential environmental issues.

This ECMS has been prepared as a practical environmental management tool for use by all HEA personnel and subcontractors and incorporates the assessment of the environmental and community risks for these works. The specific environmental and community management controls developed and detailed in the ECMS, include the following key information:

Key site and management personnel - responsibilities and contact details.

Operating hours.

Construction details – activities, staging and schedule.

Objectives and targets – monitoring requirements, criteria and procedures.

Action tables/plans – responsibilities, training, timing, reporting, monitoring/auditing and checklists.

Environmental Control Plans - Site layout, monitoring locations, erosion controls, noise barriers, discharge points and limits of clearing.

1.1 ECMS overview The General Construction ECMS 1 will be required for all construction sites.

This activity specific ECMS provides only specific requirements for drilling and grouting of mine voids and the grout batch plant. This ECMS will need to be used in conjunction with the following ECMSs for the project:

ECMS 1: General Construction (HEA-CMS-ENV-001) which will apply for the non-specific requirements for the site.

ECMS 2: Clearing and Topsoil Management (HEA-CMS-ENV-002) which will apply for the clearing necessary for the pads.

ECMS 5: Access Tracks for Mine Void Treatment and Viaducts (HEA-CMS-ENV-005) will apply to the tracks necessary for access to the area.

The Site Supervisor in consultation with the QA Manager will determine which ECMSs are required for each work sites. Refer to the overview map contained in ECMS #1 for an overview of all ECMSs.

This ECMS includes the following:




Attachment A – Environmental Control Plans.

Attachment B – Diagrammatic representation of drilling and grout filling activities.

Attachment C – Grouting spill procedure

The ECMS site-specific Environmental Control Plans (ECPs) include site-specific drawings on a cadastral and air photo base with site boundary overlain, general traffic controls and site-specific environmental management action tables. ECPs are to be read/ implemented in conjunction with the ECMS document and relevant reference documents and are for day-to-day reference for managing activities on the individual sites. The ECPs have been designed as A3 and/or A1 drawings for attachment to site shed walls.

Currently there is only detailed information relating to the pads required for Viaduct 3 and the ECP has been based on this. However as works progress and remaining areas are required to be entered, further ECPs will be added to the ECMS. Refer Section 2 for further details.

1.2 Key reference documents to ECMS The development of this ECMS has been guided by the following detailed management plans and reports to assist in the development of mitigation of specific environmental issues for the works. A list of the relevant sub-plans is given in Table 1.1. This ECMS provides the required detail for day-to-day worksite activities and the management plans and reports will be referred as needed for specific information requirements:

Table 1.1: Relevant sub-plans to the ECMS

Issue Relevant Plan(s) Details

Noise & vibration (incl. blast management)

Construction Noise & Vibration Sub Plan

(incl. Blast Management Strategy & Construction Noise Impact Statements)

HEA-PL-GL-NVP-001-00

Provides a comparison of measured background noise levels at sensitive receivers vs. predicted noise impacts, duration of impacts from site works and traffic, physical and site management measures to minimise impacts and compliance monitoring program.

Flora & Fauna

Visual

Flora and Fauna Management Sub Plan (incl Landscape Master Plan) HEA-PL-GL-FFP-001-00

Clearing and Grubbing Procedure HEA-PL-GL-FFP-001-G

Preliminary fauna mitigation structures and specifications HEA-PL-GL-FFP-001-C

Provides details of the location of sensitive environment, including EECs and management measures to prevent construction encroachment.

Soil and water quality

Soil & Water Management Sub Plan HEA-PL-GL-SWP-00-00

Landscape Management Sub Plan

Spoil Management Sub Plan

Provides details of the physical and management controls for surface runoff, erosion and sedimentation control, incident response and details of the compliance monitoring program.




Issue Relevant Plan(s) Details

HEA-PL-GL-SHP-001-00

Water Quality Monitoring Work Procedure HEA-PL-GL-SWP-001-A

Dewatering Procedure HEA-PL-GL-SWP-001-B

Location of Drainage Structures, Waterways and Water Quality Monitoring Locations HEA-PL-GL-SWP-001-00

Land contamination Hazard & Risk Management Plan

HEA-PL-GL-HRP-001-00

Provides details of the assessment of contamination.

Heritage Aboriginal Cultural Heritage Management Sub Plan HEA-PL-GL-IHP-001-00

Historical Heritage Management Sub Plan HEA-PL-GL-HHP-001-00

Provides details of the location known and potential of archaeological sites and heritage sites as well as management measures to prevent damage or destruction.

Air Quality Construction Air Quality Management Plan

HEA-PL-GL-AQP-001-00

Provides details on the location of sensitive receivers, air quality impacts from construction works and mitigation strategies and measures.

Waste Waste Management & Re-Use Sub Plan

HEA-PL-GL-WMP-001-00

Provides details on the waste strategies and management measures to maximise reuse, minimise waste generation and ensure lawful disposal where required.

1.2.1 Additional relevant references

Managing Urban Stormwater: Soil and Construction, Appendix C- Unsealed Roads. Department of Environment and Climate Change (2008). http://www.environment.nsw.gov.au/resources/stormwater/0802soilsconststorm2c.pdf

Mine Void Grouting Works for Viaduct 3 Consistency review report Hunter Expressway Alliance (2010). HEA-GEN-RPT-EN000-077.

http://www.environment.nsw.gov.au/resources/stormwater/0802soilsconststorm2c.pdf




2 Scope of works This ECMS covers works associated with mine void drilling and grouting.

The eastern end of the Hunter Expressway alignment is underlain by historic underground mine workings (mine voids) that present a potential hazard for the construction of the project, specifically the viaducts and the F3 Interchange. Figure 2.1 shows the extent of the mine voids that impact the project. The main mining method used has been ‘bore and pillar’ where approximately 60% of the coal has been extracted and the remaining coal has been left in the form of pillars to support the roof.

Within these areas of the project alignment, the HEA has identified the potential for sudden collapse of large areas of the existing structural pillars within the mine voids, which would result in subsidence and horizontal movement.

Investigation shows that without any treatment, a pillar collapse in the vicinity of structures (ie bridges and viaducts) could possibly result in a vertical movement in the order of 0.5-0.8 m and horizontal movements of 50-300 mm. This degree of movement would not be acceptable as structures would fail and this would pose a maintenance and safety risk for the project.

Treatment of the mine voids left by the coal extraction is therefore required to prevent subsidence movement associated with the sudden collapse of standing pillars to ensure adequate strength and stability for bridge and viaduct structures. The mine void treatment would require an area equal to half the overburden depth outside the alignment to be treated with a low strength grout. As the overburden depth is approximately 90 metres on average, an area of 40-50 metres beyond the alignment would require grouting.

Mine voids will also likely have high levels of methane gas trapped within the voids. Care will need to be taken during drilling of the voids to prevent sparks or other ignition sources from coming into contact with the gas which is highly flammable.

The process will require a number of steps including

1. Site clearing for construction pads.

2. Preparation and maintenance of access tracks and pads.

3. Transport of drilling machines and equipment to site and set up on construction pads.

4. Drilling to required depth of approximately 90 m (average) below ground surface to locate mine voids.

5. Transport and set up of grout batch plant on construction pad.

6. Premix of grout and transport to site by trucks or through a series of pipelines or other similar methodology.

7. Injection of grout into the mine voids.

ZamboltA

Typewriter

Figure 2.1 Extent of mine voids in the project area




The work will be staged and is likely to be in the following sequence – however this would be subject to the final viaduct construction program.

1. Viaduct 3 (ECP 1)



4. Minmi Creek (ECP 4)

5. F3 interchange (ECP 5)

6. Retaining wall RW14 (ECP 6)

Plant will occupy each site for approximately 5 to 8 months with some overlap.

2.1 Clearing and access Clearing will need to be done for access tracks and the construction pads and will be done in accordance with ECMS 2 Clearing and Topsoil Management (HEA-CMS-ENV-002) and ECMS 5 Access Tracks for Mine Void Treatment and Viaducts (HEA-CMS-ENV-005). Prior to clearing, individual erosion and sediment control plans will need to be developed for each pad area.

2.1.1 Access tracks

Where possible, existing roads and tracks will be used to access the construction pads. However this will depend on the current condition of the tracks. The following tracks will be used as necessary:

Existing tracks with adequate width – some potholing and minor maintenance may be required.

Existing tracks which will need to be widened and upgraded – some clearing will need to be carried out.

New tracks – clearing and grading will need to be carried out.

Where possible, access tracks will be used for both the mine subsidence treatment works and the building of bridge structures to minimise clearing. Due to the steep terrain in this area, the access tracks will need to be designed across the slope to provide a grade suitable for use by trucks, plant and equipment. Clearing for the construction pads and access tracks will be kept within the limits defined for the project. For further details regarding mitigations for clearing and access tracks, refer to ECMS 2 and ECMS 5.

2.1.2 Construction pads

Each of the six stages will require different numbers and locations of pads depending on local conditions. The location and extent of the drilling pads for Viaduct 3 are shown in the Environmental Control Plan in Appendix A. Pads will only be located and constructed in consultation with the Environment Manager.

The construction pads will be placed in strategic locations taking advantage of mine void locations, topography and maximum drill angle to maintain accuracy. The pad material will be compacted and levelled and will be constructed from nearby material where possible. The top of the pad will have a road base surface or similar to provide a level surface and hard working platform for both drilling and grouting activities. The pads will include containment bunds and drill storage areas.




2.2 Drilling Drilling will be carried out from the construction pads and the number of holes will be determined by the success rate of hitting the mine voids, collapsed areas and the viscosity of the grout. The intention is to drill the least number of holes possible while meeting the requirement of filling the mine void area. Approximately 3,000 holes will need to be drilled during the mine void treatment.

2.2.1 Drilling equipment

Due to the topography in the area, track mounted drilling equipment will be used. Suitable equipment that will be used includes Atlas Copco Mustang F4 series, Atlas Copco L8, Hutte 205 or equivalent as depicted in Figure 2.2.

Figure 2.2: Typical drilling equipment.

2.2.2 Drilling methods

Drilling depth will vary between 65 m to 120 m and, where necessary, will be undertaken with retractable casing due to the risk of hole collapse while drilling. Hole diameter will be approximately 140 mm to allow inspection equipment (e.g. camera) where required to be sent down and grouting mix to be pumped in.

Mine voids will be tested to determine the presence of methane gas. Where methane is detected, a water mist or a biodegradable foam will be added to the drill line as a flushing medium to reduce the risk of sparks and therefore ignition of the gas. Where no methane is present, air will be used to flush the drill line.

On completion of the drill hole, a steel or poly pipe will be inserted into the hole where necessary to ensure free access for inspection equipment and delivery of the grout. Where methane gas is present, the top of the hole will be capped to prevent the gas from escaping.

Refer figures in Attachment C for a diagrammatic representation of typical drill coverage and how the grouting will be carried out.

2.2.3 Water use

As indicated above, a water mist may be required for certain areas where methane gas is present. By using this technique, water demand for the drilling will be minimal and only a fraction of the amount required if water flushing was used.

Water will also be required to mix the grout to the right consistency. The expected water demand for the grout is 500 L/m3 of grout. The volume of grout is expected to be approximately 200,000 m3, therefore total water use for both drilling and grouting will be approximately 200 ML.

http://images.google.com.au/imgres?imgurl=http://img.alibaba.com/photo/101669538/Atlas_copco_L8_L6_Drill_rig.jpg&imgrefurl=http://www.alibaba.com/product/ie102708488-101669538-0/Atlas_copco_L8_L6_Drill_rig.html&usg=__PsX7S2zPppCh8S_Ud3gCVhuXjIs=&h=245&w=410&sz=27&hl=en&start=1&um=1&itbs=1&tbnid=vZ5RRncCv88lFM:&tbnh=75&tbnw=125&prev=/images%3Fq%3Datlas%2Bcopco%2Bl8%2Bdrill%2Brig%26um%3D1%26hl%3Den%26safe%3Dactive%26tbs%3Disch:

http://images.google.com.au/imgres?imgurl=http://www.constructionequipmentguide.com/scripts/asp_resize_edit.asp%3Fid%3D4426%26width%3D400&imgrefurl=http://www.constructionequipmentguide.com/Atlas-Copcos-Mustang-4-F1-Compact-Rig-Can-Drill-in-Tight-Work-Sites/11818/&usg=__RVok3hRaEMJroMoAvYOWYq7kURg=&h=533&w=400&sz=26&hl=en&start=1&um=1&itbs=1&tbnid=YjN4fdQzM9H8rM:&tbnh=132&tbnw=99&prev=/images%3Fq%3Datlas%2Bcopco%2Bmustang%2Bdrill%2Brig%26um%3D1%26hl%3Den%26safe%3Dactive%26sa%3DN%26tbs%3Disch:




2.2.4 Spoil management

The drill holes will be approximately 140 mm in diameter and drilling depth would vary between 65 m and 120 m in depth. The total number of holes over the alignment will be approximately 3,000 holes. Therefore this will result in approximately 3,000 to 5000 m3 of spoil. If suitable, spoil will be reused on site, otherwise it will be disposed of in accordance with the Waste Management and Re-use Subplan (HEA-PL-GL-WMP-001-00).

2.2.5 Investigation of mine drill hole and mine voids

On completion of drilling for each hole within a section, a camera will be lowered into the mine void where required to confirm the location with the mine map and to investigate the flow path available for the grout.

2.3 Grouting The grouting of the mine voids will be undertaken with two different types of grout. A stiff (barrier) grout will be used to form a barrier around the perimeter area and a more liquid (infill) grout will be used to fill all the voids within the barrier. The grouting system will consist of a batch plant, grout pumps and holding tanks. The barrier grout will either be transported to a point close to the grout hole by agitator trucks or pumped where possible. The infill grout will be pumped to the relevant hole via a pump and hose.

2.3.1 Supply of grout batch plant

A grout batch plant will be required to mix the grout on site to the correct consistency. The grout batch plant will be located within the construction boundary in the cut between Viaduct 1 and Viaduct 2 between chainage 1800-2100.

The grout batching production is expected to be undertaken outside standard construction hours. A noise impact assessment has been undertaken and is contained in the Construction noise and vibration impact statement: Batching plants, pre-cast yard, site offices and compound (CNVIS) document for the project. The CNVIS found that the nearest residential receivers are located approximately 800 metres from the site. Nearest vibration sensitive sites are 100 metres from the site.

The grout batch plant that will be used for the project will generally be as depicted in Figure 2.3.

Figure 2.3: Diagrammatic representation of likely batch plant for the project




2.3.2 Mobilise and demobilise grout batch plant

The grout batch plant will be mobilised to site from the current location on the Coopernook to Herons Creek Pacific Highway Upgrade project. Prior to arrival of the plant, an area of approximately 3,800 m2 will need to be prepared as a pad. The pad will also be semi-sealed with geofabric and crushed rock (or equivalent) to suppress dust and minimise erosion potential.

The grout batch plant will take approximately 3-4 days to install and fully commission. Transport to site will be by oversized semi trailers with special permits required. Demobilisation of the grout batch plant will occur in the reverse order of the installation process.

2.4 Materials

2.4.1 Material supply

Material required for the grout is water, flyash, cement and a fine aggregate (crusher dust). The flyash, cement and crusher dust will be sourced from local suppliers where available. The water will be sourced from local supply and supplied to site via water tanker trucks until the project water pipeline is operational.

2.4.2 Grout mix

A number of trial mixes have been tested to find a suitable barrier mix and fill mix. Figure 2.4 shows the testing of the barrier mix.

Figure 2.4: Testing of the stiff grout to ensure the correct consistency.

A typical barrier mix of one cubic meter of stiff grout will comprise approximately the following amounts (this is subject to change depending on individual circumstances at the site):

83 kilograms (kg) of cement 830 kg of flyash 830 kg crusher dust 275 kg of water




A typical fill mix of one cubic meter of liquid grout will comprise:

82 kg of cement 1085 kg of flyash 450 kg of water

2.5 Delivery of grout from batch plant to grout pump

2.5.1 Pumping of grout into mine void

Pumping both barrier grout and infill grout will be done from the grout batch plant via the most effective delivery system (eg pipe, hose, trucks etc) to the mine void. It is expected that barrier grout will mostly be delivered via agitator trucks whilst the infill grout will be delivered via a hose system.

All pump lines are planned to be 100 mm internal diameter, however this may increase to 125 mm where required. The majority of the line will be flanged steel concrete pump line. Where flexible line is required this will be rubber concrete pump line (Alfagomma or similar). All pump lines will be rated to 100 bar safe working pressure.

Two distinct types of grout pumping line will be operated:

The barrier pump lines will be relatively short, stretching from a concrete pump setup on the drill pad to all holes on that drill pad (~50m length of pump line). We may extend the barrier pump line to adjacent drill pads if this best suits site logistics (up to 150m pump line). The barrier pump line will be entirely within the drill pad and access tracks.

The infill pump line will be 500-1200 m long, reaching from the batch plant to where it is required. This pump line will be laid through the vegetation, preferably alongside existing access tracks. The line will be shortened / lengthened to reach the active drill pad.

The pump line will be laid on or very near the ground by hand by a crew of four people. Typically it will be laid on sand bags / car tyres to prop it up approximately 100 mm above the ground. Short gullies will be crossed using a rigid steel line that will be elevated as it crosses the gully. Cliffs etc greater than about 5 m high will be descended / climbed using flexible rubber hose.

2.5.2 Clearing blocked injection lines

Due to the long pumping distances and skin friction of the pipe line, grout solids may settle out at the low points of the infill grout pipeline routes and so may cause blockages. Where injection lines become blocked, water will be used at high pressure to clear the injection lines and force the grout into the mine void area.

2.5.3 Disposal of excess grout

Any grout not used in the mine void treatment will be tested and appropriate disposal options will be undertaken. This may include discharge or reuse in the construction works.




2.6 Hours of operation Drilling and grouting works will be undertaken within the approved construction hours specified in Condition of Approval no. 73, or as otherwise approved under Condition of Approval no. 74. If required, out-of-hours approval for the proposal would be obtained from DECCW in accordance with the Environment Protection Licence for the project and Condition of Approval no. 73.

2.7 Site rehabilitation and restoration The drilling pads and associated construction access tracks will be progressively rehabilitated to their pre-construction state at the completion of the mine void grouting works (except for those areas required for the construction of the viaducts). The rehabilitation will be undertaken in accordance with the 100% Design for Topsoil Submission report and will include the following activities.

1. Where existing topsoil is absent:

Rip the Subsoil/subgrade will be to a depth of 300 mm.

Apply A2 horizon to a depth of 200 mm, where A2 horizon is absent.

Apply A1 horizon bushland topsoil to a depth of 100 mm.

Apply appropriate hydromulch seed mix or planting in accordance with the landscape plans.

2. Where existing topsoil is present:

Rip the topsoil to a depth of 300 mm.

Avoid ripping within the dripline of established trees.

Apply composted site woodchip to the amount as directed by the Alliance soil scientist to augment the organic matter of the site soil.

Apply appropriate hydromulch seed mix or planting in accordance with the landscape plans.

3. Mulching:

Apply 75 mm mulch to all planted areas whether group planting or individual tree planting.

Apply 1 m x 1 m x 75 mm of mulch per tree around individually planted trees.

Do not apply mulch to areas below the water line.

All advanced Hiko tube shrubs and trees are to be staked and installed with tree guards as per the planting schedules.




3 Key roles and responsibilities Refer to the ‘General Construction ECMS #1 for roles and responsibilities for key personnel.




4 Statutory requirements and approvals A summary of the key statutory requirements and approvals for the works are detailed in the table below.

Table 4.1: Legislation and statutory obligations

Regulator Licence/Approval etc Relevant works

Dept of Planning MCoA -Comply with Blue Book: Managing Urban Stormwater: Soil and Construction

Design and construction of waterway crossing and erosion sediment control structures

DECCW Environmental Protection Licence - POEO Act 1997

Discharge from sediment basins

Impact on waterways

Noise criteria

DECCW, Dept of Planning Approval as per MCoA -60 To clear areas that exceed project limits

DECCW Licence to harm or pick threatened species, populations or ecological communities or damage habitat

Clearing or disturbing areas of threatened species, populations, or EEC

Seed and cutting collection

NSW Heritage Council NSW Heritage Act 1977:

s139 excavation permit s146 notice of relic discovery

Excavation near a heritage item

DECCW National Parks and Wildlife Act 1974:

s87 / s90 Aboriginal Heritage Impact Permit

Construction works near an aboriginal sites

4.1 Revision of ECMS to reflect licence conditions Up-to-date copies of each licence are kept on site for reference as required.

4.2 ECMS consultation process Consultation for the project has been undertaken with agencies and stakeholders including:

Department of Planning

DECCW

Lake Macquarie City Council




Maitland City Council

Cessnock City Council

Industries and Investment NSW

Utility providers

Local Aboriginal Land Councils

Ongoing consultation during the works covered under this ECMS will be undertaken with relevant stakeholders where changes to works occur under this ECMS. Specifically DoP and DECCW will be notified where necessary.

Any further updates to the ECMS requires EMR endorsement and a summary of changes and updates will be provided to the public for their information, and a full copy of the ECMS be made available on the internet, following EMR endorsement .

4.3 Minister’s Conditions of Approval Minister’s Condition of Approval 30 is reproduced in the table below with cross reference to where the condition is addressed in this ECMS or other project management documents.

Table 4.2: Matrix of Minister’s Condition of Approval 30

Reference MCoA 30 Requirement ECMS Reference

The Proponent shall prepare Construction Method Statements (CMS) identified in the CEMP required by Condition 24. CMSs must be certified by the EMR as being in accordance with the Conditions of Approval and all undertakings made in the EIS, Representations Report and the Approved CEMP.

Each CMS shall include, but not be limited to:

i construction activities and processes associated with the relevant construction site(s), including staging and timing of the proposed works;

1. Introduction and 2. Scope of works

ii specific hours of operation for all key elements including off-site movements;

2.9 Hours of operations

iii cover specific environmental management objectives and strategies for the environmental system elements and include, but not be limited to:

Environmental Control Plan at Attachment A - will cover relevant issues

noise and vibration;

air quality;

water quality;

erosion and sedimentation;

access and traffic; NA

property acquisition and/or adjustments NA

heritage and archaeology

flora and fauna





groundwater

acid sulfate soils

spoil stockpiling and disposal

waste/resource management

weed management

flooding and stormwater control NA

geotechnical issues NA

visual screening NA

landscaping and rehabilitation

safety, hazards and risk

energy use

resource use and recycling

utilities

iv address, but not be limited to:

a. identification of the statutory and other obligations which the Proponent is required to fulfil during project construction, including all approvals and consultations/agreements required from other authorities and stakeholders, and key legislation and policies which control the Proponent’s construction of the project;

5. Statutory requirements and approvals

b. measures to avoid and/or control the occurrence of environmental impacts;

Environmental Control Plan - Attachment A

c. measures (where practicable and cost effective) to provide positive environmental offsets to unavoidable environmental impacts;

NA

d. definition of the role, responsibility, authority, accountability and reporting of personnel relevant to compliance with the CMS;

3. Key roles and responsibilities & ECP in Attachment A

e. site specific environmental management techniques and processes for all construction processes which are important for the quality of the environment in respect of permanent and/or temporary works;

ECP in Attachment A

f. site specific monitoring, inspection and test plans for all activities and environmental qualities which are important to the environmental management of the project, including performance criteria, tests, and protocols (eg. frequency and location);

6. Monitoring and inspections & ECP in Attachment A

g. locational details of important elements such as temporary noise barriers; portable offices and amenities; truck, plant and materials storage; access locations; provision of site hoardings etc;

ECP in Attachment A

h. environmental management instructions for all complex environmental control processes which do not follow common practice or where the absence of such instructions could be potentially detrimental to the environment;

Refer to Table 1-3 in ECMS 1 General Construction

i. steps the Proponent intends to take to ensure that all Plans and Sub Plans are being complied with;

ECP in Attachment A





j. consultation requirements with relevant government agencies and utility/ service providers; and,

ECP in Attachment A

k. community consultation and notification strategy (including local community, businesses, relevant government agencies, and all relevant Councils), and complaint handling procedures.

ECP in Attachment A

Specific requirements of the main environmental system elements referred to in (iii) shall be as required under the conditions of this approval and/or as required under any licence or approval. All CMS shall be made publicly available




5 Site induction and training Refer to the ‘General Construction ECMS #1 for training details.

6 Monitoring and inspection Refer to the Environmental Control Plan, Attachment A for details on monitoring and inspection.

7 Revisions Revisions to the ECMS will be made as required and changes will be endorsed by the EMR as required.

The current copy of this ECMS is kept at the worksite and at the HEA Project Display Office following EMR endorsement (where they may be viewed on request) and a summary of the update provided to community members for their information via the HEA Project Display Office.

8 Document control Project document control is detailed in the PMP and project filing and numbering is defined in procedure HEA-MP-GL-OPS-002-00. When the document is reviewed a new revision number is assigned by the Environment Manager.

The current revision of the ECMS and specifically the ECMS Drawing Sheets (1-3) will be available and displayed in site offices for ongoing implementation and amendment as conditions or approval change. The documents will be saved in Keystone.




9 Attachments Attachment A – Environmental Construction Method Statement Environmental Control Plans

Attachment B – Diagrammatic representation of drilling and grout filling activities

Attachment C – Grouting spill procedure



HEA-CMS-GL-ENV-006-00-01_Minevoids.Doc

Attachment A

Environmental Construction Method Statement Environmental Control Plans

50 mm on Original

GENHEA GIS

HUNTER EXPRESSWAY ALLIANCE

Company Zone Type Figure No. Issue

DescriptionIssue Date Approved

1780

1800

1820

1840

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2000

2020

2040

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2120

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242024

40

246024

80

2500

252025

40

256025

80260026

20264026

60268027

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40276027

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20284028

60288029

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9

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17

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14

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12

10

11

2b

2a

1a

1b Blue Gum Creek 1Blue Gum Creek 2

Blue Gum Creek 4 & PAD

PAD 10 Rock shelter on Burnt Creek

BW010

BW011

BLUE G

UM CRE

EK

BURN

T CR

EEK

Lichenostomus melanops

BGC-D

BGC-U

BERESFIELD

Viaducts

Rest area

Buchanan interchange

Newcastle interchange

Kurri Kurri interchange

Skyline Ridge cut

JOHN REN

SHA W DRIVE

GEORGE BOOTH DRIVE

BLA CKHILL ROAD

MINMI ROAD

LEGG

ETTS

DRIVE

SYDN

EY N

EWCA

STLE

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EWAYBU

CHAN

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ROAD

NEWCASTLE

LINK ROAD

KURRI KURRI

NEWCASTLE

1:1000

0 100 m

Grouting pad

! European heritage location

! Indigenous heritage location

! Hollow-bearing tree

! Threatened fauna location

!A Water monitoring location

Richmond Vale Railway

Richmond Vale Railway Tunnel

Design

Expressway project boundary

Road design (DES HEA 007)

Basin design

Construction access design

Water bodies

Watercourse

Vegetation (CK2010 Niche)

Alluvial Tall Moist Forest (EEC)

Coastal Foothills Spotted Gum-Ironbark Forest (EEC)

Aboriginal heritage management zones (Umwelt)

Cleared under s.90 consent

Impact minimisation

EN189 B

ECMS:MINE VOID DRILLING AND GROUTING

A FOR INFORMATION 27 JUL 10

0000

PRELIMINARY

DB

Status

Original Size

Coordinate System

Height Datum

Drawn

Designed

Date Printed

A0

MGA ZONE 56

AHD

NOT USED FOR CONSTRUCTION

EM

13 SEP 10Tuesday, September 13, 2010 3:45:21 PM\\10.10.25.35\data\HEA\L-GIS\A_Current\B_Maps\HEA-GEN-GIS-EN189-A0-ECMS Mine Grouting-A.mxd

Management Sub-Plans

Construction Air Quality

HEA-PL-GL-AQP-001

Flora and Fauna HEA-PL-GL-FFP-001

Hazard and Risk HEA-PL-GL-HRP-001

Historical Heritage HEA-PL-GL-HHP-001

Indigenous Heritage HEA-PL-GL-IHP-001

Construction Noise and Vibration

CNVMP-HEA-PL-GL-NVP-001

Soil and Water HEA-PL-GL-SWP-001

Spoil HEA-PL-GL-SMP-001

Utility Services HEA-PL-GL-USP-001

Waste Management/Reuse

HEA-PL-GL-WMP-001

Community Involvement Plan

HEA-PL-GL-CIP-001

Licences/Approvals

Environment Protection Licence No. 13296

Section 87/90 Permit – National Parks and Wildlife Act 1974

Part 3A Permit – Rivers and Foreshores Improvement Act 1948

Indigenous Heritage Management

Sub-Plan Ref: Indigenous Heritage Management Plan (HEA-GL-PL-IHP-001)

Objective: To protect any identified heritage items where they are to be preserved. To ensure correct protocols are followed where unidentified items are discovered.

Performance criteria: No damage to any known indigenous heritage items. Any heritage items inadvertently encountered during construction are protected in accordance with NSW legislative requirements.

Mitigation measures Responsibility

Pre-construction

Brief all Contractors on the provisions of the National Parks and Wildlife Act in relation to Aboriginal objects/items, location of no-go zones and the protocol for the discovery of previously unidentified Aboriginal objects prior to commencement of working on the site.

CM, PEM

Note especially the heritage items close to the site - the Aboriginal Pathway on Stockrington Road and the Blue Gum Ck grinding groove sites are the most applicable.

CM, PEM

During construction

Stay within the construction boundary, delineated by the green area on the map. Where necessary, fence this area on site.

CM

Restrict all ground disturbing works to within the existing Section 90 consent (#2562) area for the Hunter Expressway.

SE

If suspected Aboriginal sites or relics are identified during construction works then all work that may impact on that area shall cease immediately and the Protocols in Sections 5.4 and 5.5 of the Indigenous Heritage Management Sub-Plan implemented. If you don't know these protocols, ask the Environment Manager.

SS, PEM

Monitoring

Pre-Construction condition inspection to be undertaken by qualified archaeologist prior to works commencing near an Aboriginal heritage object.

CM

Regularly monitor Aboriginal sites area to ensure mitigation measures are still in place - ie fences are still up and no damage has occurred.

SS, PEM

During initial ground breaking a representative of the LALC will be invited to observe the works, to ensure no unidentified items are disturbed without the required approvals and recording.

PEM

Historical Heritage Management

Sub-Plan Ref: Historical Heritage Management Plan (HEA-GL-PL-HHP-001)

Objectives: To minimise disturbance and avoid damage to any identified historical heritage items during construction.

Performance criteria: Heritage items are protected during construction in accordance with NSW legislative requirements.


Pre-construction

Provide personnel and contractors site induction on the requirements of the Heritage Act 1977 and heritage site identification/ protection. Note particularly the Tunnel and Burrenjim Dam.

PEM

The following item(s) must be signed on site:

• Richmond Vale Railway – Rail Tunnel 134 (No 1 Tunnel) and cutting at chainage 2365 to 2480.

SS

Seek specialist advice and assessment by a structural engineer to ensure that Tunnel 134 and Burrenjim Dam are not impacted by proposed works.

CM

Appropriate signage to the fenced area is to be erected to note that the item/s is/are a historical heritage item and protected by the provisions of the Heritage Act 1977 (NSW) and that any potential impact is an offence.

PEM

During construction

The following heritage items must not be disturbed on site: SS

• Burrenjim Dam at chainage 2590 to 2710

• Jewboy Bushrangers Cave at chainage 2795

Install appropriate erosion and sedimentation controls around/uphill to heritage items as required.

SS

Heavy earth moving equipment must not use the Richmond Vale Railway formation for access or cause any disturbance to surface features.

CM, SS

All work will cease within the immediate vicinity of any suspected Non-Indigenous heritage items identified during construction work and the Environment Manager notified and the Contingency Protocol will be implemented.

SS

Soil and Water Management

Sub Plan ref: Soil and Water Management Plan

Objective:

• Minimise the impact of erosion and sedimentation from construction activities and comply with EPL criteria for water discharge points from sediment basins.

Performance criteria:

• DECCW water quality discharge criteria for all design storm are met

• Ensure that there are no pollution incidents causing environmental harm

• Maintain background water quality levels in surrounding waterways and aquatic habitats

• Control the impact of erosion and sedimentation from earthworks and other construction activities by implementing effective erosion and sedimentation control measures

• Prevent pollution by containing all fuel and other chemical spills and by implementing effective control measure

Discharge criteria for basins: Oil & grease: pH: TSS:

visible 6.5-8.5 50 mg/L

Water quality monitoring locations Location

Blue Gum Creek (BGC) 2.590km


Re-schedule works that may lead to erosion and sedimentation (e.g. clearing) when the daily weather report received for the project forecasts rainfall events.

CM

Pre-clearing

Ensure the Progressive Erosion and Sediment Control Plan for the pads is certified by the Project Soil Conservationist.

PEM

Install erosion and sediment controls prior to any land disturbance in accordance with the Progressive Erosion and Sediment Control Plan developed for each defined work site.

SE, SS

Establish perimeter bunds around the grout batch plant to divert run on water away from the site and install a fist flush system.

SE, SS

Maintain vegetation in and adjacent to drainage lines to improve the quality of runoff before entering waterway and to prevent erosion.

SE

Clearing

Maintain soil surface cover with methods including use of the cut stump to minimise soil exposure to erosion.

CM

Remove site vegetation for re-use/sale, or tub ground and either stockpiled (& managed to become compost for revegetation purposes) or windrowed to form sediment retention berms.

SE, CM

During clearing ensure groundcover/grasses and topsoil are retained in order to capture the runoff infiltration capacity of the groundcover for as long as possible, and to minimise topsoil runoff.

SE

Keep topsoil in areas not being excavated to prevent exposure of the subsoil during clearing SE

Construction Air Quality Management

Sub-Plan Ref: Construction Dust Management (HEA-PL-GL-AQP-001)

Objectives: To minimise dust generation and manage air and dust emissions from the worksite to prevent impact on surrounding receptors.

Performance Criteria:

No sustained periods of time with visible dust.

Sensitive receptors are identified on the map for the area covered by this ECMS.


General earthworks

Use water sprays (water carts as required) to control dust emissions. SS

Recycled water to be used for dust suppression in preference to potable water. SS

Vehicle speed within the worksite areas is not to exceed 10km/hr. SS

Vehicle and transport management

Plant or equipment are not to be parked idling for extended periods of time. SS

Maintain operation and exhaust systems of construction plant, vehicles and machinery to minimise emissions to atmosphere. If exhausts observed to be emitting excessive smoke, appropriate maintenance is to be undertaken.

SS

Ensure wheels and undercarriage of trucks (wheel wash) are clean prior to the exiting the worksite – to be undertaken at the “wheel wash” area as shown on plan.

SS

Clean any dirt tracked onto public roadways from construction vehicles using brooms or a street sweeper.

SS

Cover spoil loads and secure tailgates prior to trucks leaving the worksite. SS

Monitoring

Conduct weekly inspections of worksite to monitor the effectiveness of the dust control measures.

PEM

Environmental Hazard Management

Report Ref: Hazard and Risk Plan (HEA-PL-GL-HRP-001)

Objective: To manage environmental hazards on the worksite.

Performance Criteria:

Management actions result in no incidents occurring as a result of worksite activities.

Storage of dangerous goods complies with Australian Standards, and response to any spill or other incident occurs in accordance with the Incident Response Plan.


All personnel will be inducted and trained prior to commencing work onsite on the hazards and risks of the worksite including environmental risks (e.g. spill response and cleanup and reporting).

CM

Chemicals are to be stored on site in quantities less than limits defined as “dangerous” under the Australian Dangerous Goods Code.

SS

Store all dangerous goods brought onto the worksite within the designated bunded area(s). No storage is to occur outside the designated areas.

SE, SS

Fuels and oils are only to be stored and handled in accordance with AS1940: 1999. SE, SS

Record keeping of substances used on site are to be detailed on the MSDS register. CM, SE

Provide spill kits (oil and hydrocarbon based absorbent materials) at each storage area and at areas of the worksite where handling and use of dangerous goods occur and provide appropriate staff with training in their use.

CM, SS

Spill clean-up in regards to blockages or pipeline splits must be undertaken in accordance with the procedure contained in Attachment D.

SS

Cleanup and reporting of any dangerous goods spill/leak is to occur immediately in accordance with the Incident Response Plan procedures.

SS

Conduct weekly inspections of dangerous goods storage areas, including documentation of volumes/weights of dangerous goods, status of bunding, visible staining/spills/leaks etc, check of spill kit contents.

SS

Waste Management and Reuse

Sub-Plan Ref: Waste Management and Reuse Plan (HEA-PL-GL-WMP-001)

Objective: To implement reuse and recycling programs where practicable for waste generated from the project activities.

Performance criteria (targets): Vegetation clearing – 100% reuse on site; Contaminated water reuse – 50% (refer Waste Management and Re-use Sub-plan for details).


Provide site personnel with induction/instruction in waste produced/ reused/ recycled/ disposed and any special storage or disposal arrangements (e.g. hazardous wastes, chemicals, waste oils/ acid sulfate soils/contaminated materials).

CM

Ensure waste containers have clear signage to identify the specific containers for waste segregation.

SS

Waste reuse

Spoil is to be replaced in the hole where possible, otherwise to be reused on-site in accordance with the Spoil Management Plan.

SS

Store any empty fuel, lubricant and chemical containers for collection by a drum recycler for cleaning and reuse.

SS

Waste recycling

Provide waste bins at the work site and batch plant in convenient locations for segregation of recyclable materials.

SS

Waste disposal

Provide rubbish skips in appropriate locations on site and ensure a contractor is commissioned to regularly remove/empty the bins. All bin removal/clearance will be undertaken within site boundaries.

CM

Dispose of all non-hazardous waste that cannot be recycled/reused in skips for disposal to approved landfill.

CM

Dispose of all hazardous or contaminated waste materials at approved disposal facilities in accordance with the EPA’s Environmental Guidelines: Assessment, Classification and Management of Liquid and Non-liquid Wastes, and Contaminated Land Management Act 1997.

CM, SE, PEM

Check licences of all waste transporters and make sure they are appropriately licensed to carry the materials to licensed waste facilities.

CM, SE

Monitoring

Records of waste disposal and recycling (quantities, destination) will be tracked (docket system) and reported monthly.

CM, SE

Monitor waste management and recycling practices at the worksite weekly. PEM

Noise and Vibration Management

Sub-Plan Ref: Construction Noise and Vibration (CNVMP-HEA-GL-PL-NVP-001);

Objective: To minimise noise/vibration impact to sensitive receptors.

Performance criteria: No noise complaints.


Provide site personnel with induction/instruction on key noise issues, approved construction hours and community concerns. Note particularly the susceptibility of the Tunnel and Burrenjim dam to vibration levels.

CM

Carry out works in accordance with Practice Note VII of the RTA's Noise Manual. SS

Investigate any noise or vibration complaints reported and recorded in accordance with Community Involvement Plan.

CRM, PEM

Plant and equipment to be switched off when not in use. SS

Delivery of oversize items of plant/ equipment to the worksite may occur outside of standard work hours only in accordance with RTA requirements and approval of EPA.

SE, SS

Heavy vehicle movements related to the worksite activities shall not pass through residential areas.

SE

All site equipment will be equipped with properly functioning noise attenuation devices (eg mufflers) and will be properly tested, serviced and maintained to minimise noise emissions. Maximise the offset distance between noisy plant items and sensitive receivers (where practicable) and minimise co-incidence of noisy plant working simultaneously.

SS

Monitoring Responsibility

Undertake monitoring of Tunnel 134 and Burrenjim Dam by a qualified vibration consultant and structural engineer during works, where Burrenjim Dam, Richmond Vale Railway and/or Tunnel 134 (Tunnel No. 1) are deemed to be at risk from potential vibration impacts as a result of the proposed drilling.

CM, PEM

Hours of work

Audible Construction Works

• Monday to Friday 7am-6pm

• Saturday 8am-1pm

Out of Hours Delivery

• Oversize Plant & Equipment in accordance with MCoA 61

• Community Relations Manager to be notified in advance

Out-of-Hours Operations

• No audible construction works out of hours.

• Delivery of materials required by the Police or other authorities are permitted out of hours.

• All out of standard hours construction works to be undertaken subject to approval from Environment Manager and Community Relations Manager.

Sundays or Public Holidays - No Audible Construction Works

HEA Points of Contact

For all Public Enquiries

HEA Community Response Line 1800 001 267

DECCW Pollution Line 131555

Peter Chatburn Project Director 0418 233 905

Aiden McCann Construction Manager 0418 627 085

Tracey Doczy Environment Operations Manager 0439 300 118

Erran Woodward Environment Officer 0437 343 178

Louise Neville Community Relation Manager 0447 464 031

Ken Holmes Environmental Management Representative

0438 046 261

David Ledlin RTA Senior Environmental Officer 0411 126 989

Fauna rescue Wires 1300 094 737

Wildlife Aid Rescue – Hunter Valley

0447 667 737

Native Animal Trust Fund – Wildlife Rescue Service

0418 628 483

Key to responsibilities

Community Relations Manager CRM

Project Environmental Manager PEM

Construction Manager CM

Site Engineer SE

Site Supervisor SS

Burrenjim Dam

Flora and Fauna Management

Sub Plan ref: Flora and Fauna Management Plan

Other reports: Mine Void Grouting Works for Viaduct 3 Consistency Review Report (HEA-GEN-RPT-EN000-077)

Objective: To protect vegetation and fauna within the construction zone

Performance criteria:

• The clearing boundaries are clearly demarcated.

• No disturbance to flora or fauna outside the clearing limits.

• No harm to fauna

• No increase in distribution of weeds within the project areas.

• No clearing or removal of hollow-bearing trees tagged for protection.


Vegetation protection and management

No dumping of fill or rubbish into remnant bushland. SS

Ensure all site employees remain within the construction boundary and /or pad boundaries and within area designated for batch plant.

SS

Maintain erosion and sediment controls during construction until revegetation works are well established (at least 70% of exposed areas stabilised).

SS

Ensure all soil or fill introduced does not contain noxious weed material. SS

Site fencing

Ensure no-go zone fencing, barriers and wildlife exclusion fencing are installed to prevent construction and drilling pad encroachment into bushland areas and sensitive environments.

SS, SE

Pre site Clearing (refer to ECMS 2 Clearing and Topsoil Management)

Prior to any clearing and grubbing works ensure the pre-clearing surveys as per the Pre-clearing Checklist has been approved by the PEM for each relevant compound site and access tracks.

CM, PEM

Prior to any clearing and grubbing works ensure a Ground Disturbance Checklist is completed following Pre-clearing Checklist approval. (FFMP 5.2.4.3 & s7)

SS

Site clearing

Undertake clearing, topsoil removal, mulching and grubbing as per ECMS 2 Clearing and Topsoil Management. This procedure includes the requirement for a qualified ecologist to mark protected vegetation as per CoA 57. It also includes a requirement to relocate fauna, mulch and stockpile cleared vegetation, retain fallen logs and treat weeds.

SS, SE

Retain native vegetation logs for habitat reestablishment and remainder mulched for rehabilitation works.

SS, SE

Do not undertake clearing without the supervision of the Project Ecologist and/or Project Environmental staff.

SS, PEM

Weed infestation management

Control weeds that are located in the construction site and any areas cleared for pads in accordance with the Weed Management Strategy as contained in the CEMP, Flora and Fauna subplan and the General Construction ECMS 1 prior to site establishment works to prevent spread during the project construction phase.

SS, SE

Ensure all construction vehicles and machinery moving from weed infested areas to native vegetation are washed down, inspected and passed as clean to prevent the spread of weed propagules.

SS, SE

Locate washdown facilities at the interface between weed infested areas and native vegetation until a sterile construction corridor is established.

SE, CM

Fauna management

Install fauna mitigation structures in accordance with the Flora and Fauna subplan Appendix C and Section 5, Management Measures and Mitigation Strategies.

CM, PEM

Habitat trees identified in the flora and fauna subplan are to be managed in accordance with the Clearing and Topsoil Management ECMS 2.

CM

Inspect equipment and machinery left overnight prior to start up as well as skip bins without lids before removal from site to prevent accidental injury or death of wildlife.

SS, SE

Contact the Project Ecologist and appropriate fauna rescue organisations when native fauna is found on site, needs to be removed or is injured. As all native fauna are protected by the NPW Act, any injury or death of native fauna are to be prevented and must be notified. Keep contact details for the Project Ecologist and appropriate fauna rescue organisations on-hand. See contact numbers in contact table.

SS, PEM

Threatened species management

Ensure site staff induction includes the location and protection measures for flora and fauna as set out in these tables..

CM, PEM

Construction activities are to cease immediately if, during the course of construction (including vegetation clearing), any threatened flora and fauna species are identified. Project Ecologist and DECCW are to be consulted.

SS, PEM

Progressive site rehabilitation

Undertake progressive site rehabilitation and mitigation procedures as detailed in the Landscape Management Plan (prepared by a qualified rehabilitation specialist).

CM

Flora and fauna monitoring

Monitor the adequacy of the exclusion fencing, the use of underpasses, extent of road kills and rehabilitation of injured wildlife and wildlife utilisation of roadside wildlife corridors in accordance with the Landscape Management Plan.

PEM

Earthworks

Protect topsoil stored for construction compound establishment from water and wind erosion by seeding with a sterile cover crop or by covering with geo-textile fabric until required

SE

Stabilise road batters in areas of high erosion hazard using a sterile cover crop. SE

Do not located plant or operations within 20m of waterways unless for the purposes of waterway crossing construction.

SS, SE

Undertake progressive revegetation of disturbed areas. CM, PEM

Delineate clearing limits to confine construction activities within the necessary area(s). SE, CM

Maintain control measures until the site is stable and 70% soil surface cover has been achieved. Once the project site has been stabilised, temporary sediment controls can be removed.

CM, SE

Desilt erosion control devices following major rainfall events. Silt to be disposed of in accordance with CMS Waste Management Table.

Ensure wheels, tracks and body surfaces of plant and vehicles leaving the site are free of mud or sediment to minimise the potential for mud tracking on public roads.

SS

Use road sweepers if conventional measures such as rumble grids are not effective - to prevent mud tracking on public roads.

SS, SE

Reuse water collected in trenches and sedimentation basins where possible. When not possible treat water before discharge as per the Dewatering Procedure.

SS, SE

Undertake all dewatering procedures to safeguard groundwater as per the Dewatering Procedure.

SS, SE

Sediment basins

Install and manage sediment basins in accordance with the Sediment Basin Procedure. SE

Stockpiling

Place material stockpiles, construction buildings and other infrastructure only in cleared areas, typically in the road corridor or site compounds, adequately distant from sediment fencing that is installed down slope to prevent loss.

SE

Have all stockpiles that are predicted to be stored for longer than 10 weeks, covered or seeded with a sterile seed crop. Topsoil should be covered or have seeded with cover crop within 2 weeks.

SE

Do not undertake stripping of topsoil and stockpiling activities during periods of wet weather. SS, SE

Do not place stockpiled materials within 5m of retained trees, within the drip line, over root systems or where overhead tree canopies could be damaged by machinery or trucks. Avoid where possible, stockpiling near waterways or drainage line, near properties or flood prone areas.

SS, SE

Ensure topsoil stockpiles do not exceed 2.5m in height and maintained to prevent the growth of weeds.

SS, SE

Vehicle Movements

All vehicles must use the designated access tracks only. SS

Conduct truck wash downs and grout/cement truck washouts in approved areas only. Washdown areas must be adequately sized, located away from drainage areas and maintained regularly.

SS

Use recovered water from construction works where possible for vehicle and equipment washdown and dust suppression.

SE, CM

Store all excess grout, concrete and waste materials in bunded areas prior to reuse or disposal. SS, SE

Cover all spoil during transportation on public roads. SS, SE

Visually assess waste water captured in storage bunds for contamination prior to being released. Remove hydrocarbon contamination using appropriate absorbent materials.

SE, PEM

Locate washdown areas for equipment in bunded areas away from watercourses and Burrenjim Dam.

CM

Spill management

Manage grout spills in accordance with the Grout Spill Procedure in Attachment D of ECMS 6 Mine Voids.

SS

Manage fuels and spills in accordance with Refuelling and Liquid Storage Protocol’ (HEA-WP-GL-ENV-03-00-00)

SE, CM

Undertake refuelling and servicing of plant and equipment away from sensitive areas and ensure they carry or have ready access to a suitable spill kit.

SS, SE

Provide spill kits for minor spills and leaks, including floatable booms for deployment to nearby watercourses as appropriate and train relevant personnel in their use.

CM

Rehabilitation and Landscaping

For all rehabilitation of construction compounds, refer to Construction Method Statement: Site Stabilisation and Rehabilitation Works and the project Landscape Management Plan.

CM

Inspections

Daily informal visual checks of all erosion and sedimentation devices to ensure that controls have been provided where required and/or are functioning correctly.

SS, SE

Weekly inspections and completion of environmental checklists:

• Check that controls are being maintained in an efficient condition;

• Check that controls meet the requirements of any relevant approval and/or licence conditions; and inspections to inform the update of PESCPs and to identify where new controls are required

PEM

Inspections following significant rainfall by the Project Engineer, Superintendent and Environmental Officer.

SE, PEM

Monitoring and reporting

Obtain daily weather forecasts to guide works undertaken on site. PEM

Undertaken monitoring of the hydrological conditions within the proposed mine void grouting area to confirm the potential groundwater impacts of the proposal. Monitoring is to include:

• Review of the downhole camera data and the development of a conceptual model of groundwater in the mine void area

• The study of borehole data (as it becomes available) to interpret a hydrogeological conceptual model for the area.

• Column leachate testing of the grout mix to assess the impact that the grout may have on groundwater quality.

• Installation of a groundwater monitoring bore to access groundwater for sampling and use in the column leachate tests.

• Request for access to sample groundwater from the Oceanic Coal West Wallsend Colliery located down gradient of the site.

SE, PEM




Attachment B

Diagrammatic representation of drilling and grout filling activities




Attachment C

Grouting Spill Procedure



17/09/2010 Document Number:

Page 1

The following steps are to be carried out for any grouting works associated with the mine void grouting.

Step Activities Responsibility

1. Spill prevention

1.1. Highlight sensitive nature of pumping grout through bush during project inductions. Mine fill Manager

1.2. Use high quality pump line that is of equivalent pressure rating or higher than the maximum pumping pressure.

Grouting Engineer

1.3. Use smaller diameter high strength pipe rather than larger diameter pipeline to minimise line volume that may be spilt in event of leak.

Grouting Engineer

1.4. Fit pipeline with dedicated inspection ports length so regular internal inspections can be carried out.

Grouting engineer

1.5. Test line before first use. Ultrasonic testing of pipe wall thickness to be carried out monthly.

Grouting Supervisor

1.6. Conduct daily visual inspections of the pipeline route and sediment controls during use.

Grouting Supervisor

1.7. Ensure pressure is maintained below maximum line rating. Grouting Supervisor

2. Minimise potential for spill to affect uncleared areas and EEC

2.1. Plan pipeline route to avoid crossing above EEC (prevent leaks flowing down hill into EEC).

Grouting Engineer

2.2. Where practical, lay pipeline along side access tracks and on high side of access track so spill flows onto track, not into bush.

Grouting Supervisor

2.3. Where pipeline laid through bush, erect sediment controls along the down slope side of the pipeline route.

Grouting Supervisor

2.4. Build sediment fencing containment ‘ponds’ at the bottom of slopes so any spills are contained within pond.

Grouting Supervisor

3. Prevent the spill entering the waterway

3.1. Plan pipeline route so creeks crossed at already existing crossing points. Grouting Engineer

3.2. Securely support pipeline at creek crossings and consider possible flood events. Grouting Supervisor

3.3. Use double-walled or sleeved line at creek crossings. Grouting Supervisor



17/09/2010 Document Number:

Page 2

Step Activities Responsibility

3.4. Install sediment controls in accordance with ESCP. Grouting Supervisor

3.5. Use existing culverts to cross under creeks where available. Grouting Supervisor

3.6. Build sediment fencing containment ‘ponds’ at the bottom of slopes so any spills are contained within pond and so prevented from flowing into creek.

Grouting Supervisor

4. During the spill and clean up of spilt grout

4.1. Identify any grout leakage that may be occurring. Pump Operator, Tremie Operator, all personnel working along route of pipeline

4.2. Turn off the pump. Pump Operator

4.3. Inform Grouting Supervisor immediately. Pump Operator

4.4. Find source of leak (1000m pipeline route), build any additional sediment control if appropriate.

Grouting Supervisor

4.5. Notify the HEA Environment Manager. Minefill Manager

4.6. Allow any spilled grout to harden (3-7 days). Grouting Supervisor

4.7. Notify DECCW where material harm to the environment has occurred in accordance with the EPL.

Environment Manager

4.8. Scrape/peel hardened grout off the ground Grouting Supervisor

4.9. Dispose of grout to licensed facility Grouting Engineer

4.10. Assess site to determine cause of leak and what other controls or cleanup is required.

Grouting Engineer & Grouting Supervisor

5. After the spill

5.1. Fill out incident report form Grouting Engineer

5.2. Send report to DECCW (if required) Environmental Manager

5.3. Complete lessons learnt & assess remaining sites to determine if more or different controls are required

Minefill Manager

Documents

Environment Construction Method Statement #6...Environment Construction Method Statement #6 Mine Void Drilling and Grouting HEA-CMS-GL-ENV-006-00-01 Scope This Construction Method