Springvale MPPS Water Treatment Project · potentially be affected by the proposal Section 7 4 (b) A program to augment the baseline data over the life of the development Section

Springvale MPPS Water Treatment Project

Water Management Plan

SMPPS-O-02-M13-00-01

DOCUMENT CONTROL

Rev Date Revision Comments Prepared by Reviewed by Approved by

0 23/8/17 Draft for internal review Sean Daykin

Jacobs

Elena Ivanova

Veolia

1 25/8/17 Final Sean Daykin

Jacobs

Elena Ivanova

Veolia

Huw Thomas

Veolia

2 03/10/17 Update following EPA and WaterNSW review Sean Daykin

Jacobs

Elena Ivanova

Veolia

Huw Thomas

Veolia

3 24/10/17 Update following DPE review Sean Daykin

Jacobs

Elena Ivanova

Veolia

Huw Thomas

Veolia

4 27/10/2017 Update following DPE review Sean Daykin

Jacobs

Elena Ivanova

Veolia

Huw Thomas

Veolia

5 27/10/2017 Final Sean Daykin

Jacobs

Elena Ivanova

Veolia

Huw Thomas

Veolia

Page: Page 2 of 40 Document: SMMPS-O-00-M13-00-01 Date: 24.10.2017

FORM Water Management Plan

Printed documents are uncontrolled versions. Check printed copies against the current electronic version for validity.

CONFIDENTIALITY CONDITIONS All information whether oral, electronic, printed or graphic contained in this document or obtained by you from VANZ (Information) is confidential to VANZ and shall not be used by you other than for the purpose of reviewing this document and the proposal contained herein. You shall not copy or reproduce any Information except when, and then only to the extent, reasonably necessary for the purpose of reviewing this document and the proposal contained herein. Upon receiving notice that our proposal has not been accepted, and if notified by VANZ, you shall destroy, in a secure manner, this document and any Information. You shall ensure that any employee or any other person to whom you supply the Information is bound by the terms of these conditions.




DEFINITIONS AND ACRONYMS Table 1 – Definitions and Acronyms

Term Definition

BOM Bureau of Meteorology

CEMP Construction Environment Management Plan

CMMS Computerised Maintenance Management System

CoA Certificates of Analysis

DO Dissolved Oxygen

DPE Department of Planning and Environment

DPI Department of Primary Industries

EA Energy Australia

EC Electrical Conductivity

EIS Environmental Impact Statement

EPA Environment Protection Authority

ESCMP Erosion and Sediment Control Management Plan

FDS Functional Description Specification

HNCMA Hawkesbury-Nepean Catchment Management Authority

LDP Licensed Discharge Point

LOS Level of Service

MPPS Mount Piper Power Station

OEMP Operational Environmental Management Plan

PEMP Project Environmental Management Plan

POEO Protection of the Environment Operations

REA Reject Emplacement Area

SCSS Springvale Coal Services Site

SCADA Supervisory Control and Data Acquisition

SSGV Site Specific Guideline Values

TARP Trigger Action Response Plan

TCR Thompsons Creek Reservoir

TSS Total Suspended Solids

VANZ Veolia Australia New Zealand

WAL Water Access Licences

WCS Western Coal Services

WRIA Water Resources Impact Assessment

WTF Water Treatment Facility

WTS Water Transfer System




TABLE OF CONTENTS

Section 1 Introduction ..................................................................................................... 6

1.1 Project Extents .................................................................................. 6 1.2 Purpose ............................................................................................. 8 1.3 Plan Development and Consultation ................................................. 8

Section 2 Statutory Requirements ............................................................................... 10

2.1 Relevant Legislation and Guidelines ............................................... 10 2.2 Approvals and Licensing ................................................................. 10

Section 3 Exisitng Environment ................................................................................... 11

3.1 Topography ..................................................................................... 11 3.2 Climate ............................................................................................ 11 3.3 Geology ........................................................................................... 12

3.4 Surface Water Environment ............................................................ 12

Section 4 Environmental Impact Assessment Key Findings and Predictions ......... 14

4.1 Wangcol Creek ................................................................................ 14

4.2 Coxs River ....................................................................................... 14 4.3 Thompsons Creek Reservoir ........................................................... 14

4.4 Groundwater .................................................................................... 15

Section 5 Water Management Performance Measures............................................... 16

5.1 General ............................................................................................ 16

5.2 Surface Water Resources ............................................................... 18

5.3 Construction and Operation of Infrastructure ................................... 18 5.4 Brine and Residual Waste ............................................................... 23

5.5 Chemical and Hydrocarbon Management ....................................... 23

Section 6 Site Water Balance ....................................................................................... 24

Section 7 Monitoring Program ..................................................................................... 26

7.1 Existing Monitoring Program and Baseline Data ............................. 26

7.2 Program to Augment Baseline Data ................................................ 28

Section 8 Contingency Plan ......................................................................................... 29

8.1 Construction .................................................................................... 29

8.2 Operation ......................................................................................... 29

8.3 WTF Maintenance ........................................................................... 30

Section 9 Performance Standards ............................................................................... 31

9.1 Quality of Water from the WTF to the TCR ...................................... 31 9.2 Quantity and Quality of Residuals from the WTF to the REA .......... 32

9.3 Quality Parameters Compliance Monitoring .................................... 32

Section 10 Reporting and Review ............................................................................. 34

10.1 Annual Review ................................................................................ 34 10.2 Incident Reporting ........................................................................... 34

10.3 Review and Revision ....................................................................... 34 10.4 Stakeholder Consultation Protocol .................................................. 35 10.5 Roles and Responsibilities .............................................................. 35

Section 11 References ............................................................................................... 37




APPENDICIES ................................................................................................................. 38

Appendix A – Process Flow Diagrams ........................................................... 38 Appendix B – Draft Erosion and Sediment Control Management Plan .......... 39 Appendix C – Trigger Action Response Plan ................................................. 40

TABLES Table 1 – Definitions and Acronyms .............................................................................................. 3

Table 2 – Development Consent Requirements ............................................................................ 8

Table 3 – Soil Landscapes and Characteristics (GHD, 2016b) .................................................... 20

Table 4 – Water Balance Summary Predicted Inputs and Outputs .............................................. 25

Table 5 – Baseline Data Collection Sites and Current Monitoring Programs ................................ 26

Table 6 – Treated Water Performance Standards (Veolia, 2017a) .............................................. 31

Table 7 – Residuals Performance Standards (Veolia, 2017a)...................................................... 32

Table 8 – Quality Parameters Compliance Monitoring and Sampling (Veolia, 2017a) ................. 32

Table 9 – Roles and Responsibilities ........................................................................................... 35

FIGURES Figure 1 – Project Extents and Location ........................................................................................ 7

Figure 2 – Monthly Average Rainfall (063224) ............................................................................. 11

Figure 3 – Daily Average Evaporation (063005) .......................................................................... 12

Figure 4 – Site Water Balance ..................................................................................................... 24

Figure 5 – Monitoring Locations .................................................................................................. 27




SECTION 1 INTRODUCTION

The Springvale Water Treatment Project (SWTP) (the Project) comprises a Water Treatment

Facility (WTF) and Water Transfer System (WTS). The Project involves constructing and

operating a pipeline and ancillary facilities to transfer water from the existing Centennial Coal

Springvale Mine and Angus Place Colliery dewatering facilities on the Newnes Plateau for

treatment and reuse at Mount Piper Power Station (MPPS).

The objective of the Project is to improve water quality in the upper Coxs River catchment through

the transfer of water from existing underground mine dewatering facilities for reuse at the MPPS

cooling towers as a first priority thus removing the requirement to discharge into the upper

catchment of the Coxs River.

Veolia has been selected as specialist water services company to design, construct, test and

commission, operate and maintain the Project. The duration of the operations and maintenance

phase is 15 years. This arrangement is documented under a Water Treatment Services Contract

to be entered into between Springvale Coal Pty Ltd, NSW Energy Australia Pty Ltd and Veolia.

The Project will involve construction of the following elements:

Water Transfer System (WTS) – The WTS is a 15 kilometre water transfer pipeline, to transfer up

to 42 mega-litres per day (ML/d) of mine water from existing underground mine dewatering

facilities (operated by Springvale Coal Pty Ltd) to MPPS (operated by Energy Australia Pty Ltd);

and

Water Treatment Facility (WTF) – The WTF is a desalination plant designed to treat the mine

water for use in the cooling towers and discharge excess treated water to Thompson’s Creek

Reservoir (TCR) if required; discharge of treated water will only occur when MPPS is not

operating at full capacity.

1.1 Project Extents

The Project, and hence this Water Management Plan (WMP), are limited to the following upstream

and downstream extents. Water management aspects beyond these extents will be addressed by

the water management plans associated with Springvale Coal Mine, Springvale Coal Services

Site (SCSS) and MPPS.

The approximate location of the Project extents is shown on Figure 1.

1.1.1 Upstream Extent

The upstream extent of the Project is at the booster pump situated on the downstream side of the

Newnes Plateau gravity tank. Water management upstream of this site will be carried out by

Downstream of Mine Water Booster Station (WBS002).

1.1.2 Downstream Extents

The Project has two downstream extents:

Immediately upstream of the discharge point where discharge is occurring to TCR. The discharge

and TCR will continue to be managed by Energy Australia.

At the end of the pipeline that transfers residual material to the Residual Emplacement Area

(REA) on the SCSS. Water management associated with the REA will be in accordance with the

Western Coal Services (WCS) Water Management Plan (Springvale Coal Services, 2017).




Figure 1 – Project Extents and Location




1.2 Purpose

The primary objective of this WMP is to manage and minimise the impact of the construction and

operation of the Project on the local water resources by:

outlining procedures to ensure adherence to all guidelines and legislative requirements

relevant to water management on the Project;

addressing the following conditions of the Development Consent (Consent) (DPE, 2017):

o Schedule 2. Conditions 1, 5 and 6

o Schedule 3, Conditions 1, 2, 3 and 4

o Schedule 4, Conditions 1, 2, 4, 5 and 6

describe procedures to enable compliance with the water management performance

measures detailed in Table 1 of the development consent.

The Planning Assessment Commission of New South Wales approved the project application on

19 June 2017, subject to a set of conditions. The Consent defines a number of environmental

performance conditions relevant to the preparation and implementation of a WMP for the Project.

Conditions relating specifically to the production of this management plan have been summarised

in Table 2. Table 2 also specifies where these conditions have been addressed within this

document.

This WMP has been developed early on in the Project design phase and will therefore require

updating as the design evolves. The review process is detailed in Section 10.

1.3 Plan Development and Consultation

This WMP has been developed in accordance with the conditions of Consent for the Project (SSD

7592), the Project Environmental Impact Statement (EIS) (GHD, 2016a), the Development

Application Amendment (GHD. 2016b) and the WCS Modification 1 Water Resources Impact

Assessment (WRIA) (GHD, 2016c). The Conditions of Consent relevant to this Water

Management Plan are shown in Table 2.

Table 2 – Development Consent Requirements

Relevant Conditions of Consent

Definition Document Reference

Water Management Plan

4 (b) Detailed baseline data on surface water flows and quality in the watercourses that could potentially be affected by the proposal Section 7

4 (b) A program to augment the baseline data over the life of the development Section 7

4 (b)

A detailed description of measures to comply with the water management performance measures:

maintain separation between mine water and treated water management systems.

minimise the use of clean water on site.

design, install, operate and maintain water management systems in a proper and

efficient manner.

design, install and maintain erosion and sediment controls generally in accordance with

the series Managing Urban Stormwater: Soils and Construction including Volume 1,

Volume 2A – Installation of Services and Volume 2C – Unsealed Roads.

design, install and maintain infrastructure within 40 m of watercourses generally in

accordance with the Guidelines for Controlled Activities on Waterfront Land (DPI 2007),

or its latest version.

Section 5




Relevant Conditions of Consent

Definition Document Reference

design, install and maintain any creek crossings generally in accordance with the Policy

and Guidelines for Fish Habitat Conservation and Management (DPI, 2013) and Why

Do Fish Need to Cross the Road? Fish Passage Requirements for Waterway Crossings

(NSW Fisheries 2003), or their latest versions.

4 (b) A program to monitor and report on the performance measures Section 10

4 (b) Reporting procedures for the results of the monitoring program Section 10

4 (b) A plan to respond to any exceedances of the performance criteria, and mitigate any adverse surface water impacts of the proposal Sections 8 and 9

Management Plan Requirements

2 The Applicant must ensure that the management plans required under this consent are prepared in accordance with any relevant guidelines, and include:

2 (a) detailed baseline data Section 7

2 (b)

a description of:

the relevant statutory requirements (including any relevant approval, licence or lease

conditions);

any relevant limits or performance measures/criteria;

the specific performance indicators that are proposed to be used to judge the

performance of, or guide the implementation of, the development or any management

measures

Sections 2 and 5

2 (c) a description of the measures that would be implemented to comply with the relevant statutory requirements, limits, or performance measures/criteria Section 5

2 (d)

a program to monitor and report on the:

impacts and environmental performance of the development;

effectiveness of any management measures (see c above)

Sections 5, 7 and 10

2 (e) a contingency plan to manage any unpredicted impacts and their consequences Section 8

2 (f) a program to investigate and implement ways to improve the environmental performance of the development over time Section 5

2 (g)

a protocol for managing and reporting any:

incidents;

complaints;

non-compliances with statutory requirements; and

exceedances of the criteria and/or performance criteria; and

Section 10




SECTION 2 STATUTORY REQUIREMENTS

2.1 Relevant Legislation and Guidelines

The key legislation and guidelines applicable to water management are:

Water Management Act 2000;

Water Management (General) Amendment (Aquifer Interference Regulation 2011) under

the Water Management Act 2000;

Water Sharing Plan for Greater Metropolitan Region Groundwater Sources and

Unregulated River Water Sources (July 2011);

Drinking Water Catchments Regional Environmental Plan No.1 (under the Environmental

Planning and Assessment Act 1979 (EP&A Act));

Protection of the Environment Operations Act 1997;

Managing Urban Stormwater: Soils and Construction (the Blue Book), Volume 1, Volume

2A, Volume 2C and Volume 2E, Mines and Quarries (Landcom 2004);

National Water Quality Management Strategy: Australian Guidelines for Water Quality

Monitoring and Reporting (ANZECC/ARMCANZ 2000);

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (ANZECC

2000);

Guidelines for the Assessment and Management of Groundwater Contamination (DECC

2007);

Policy and Guidelines for Fish Habitat Conservation and Management (DPI, 2013);

Why Do Fish Need to Cross the Road? Fish Passage Requirements for Waterway

Crossings (NSW Fisheries, 2003);

Guidelines for Controlled Activities on Waterfront Land (DPI, 2007).

2.2 Approvals and Licensing

2.2.1 Water Access Licences

The Project will use TCR as both a water supply storage and release point for excess treated

water, the current Water Access Licences (WALs) in place for the operation of the Coxs River

water supply system were reviewed. The WAL conditions and combined approval issued to

Energy Australia authorises the take and use of water from the Coxs River for power generation

purposes and includes Lilyvale Dam (Lake Lyell), Wallerawang Dam (Lake Wallace) and TCR.

These licence conditions define Energy Australia's water access rights and obligations and

regulate the operation and management of its water management works. There are no proposed

changes to the current WALs held by Energy Australia.

2.2.2 Environmental Protection Licence

Following consultation with the Environment Protection Authority (EPA) it was considered that the

Project will not require a new Environmental Protection Licences (EPL).




SECTION 3 EXISITNG ENVIRONMENT The existing environment as described in GHD (2016a, 2016b, 2016c) and RPS (2014) is as follows:

3.1 Topography

The MPPS site is located within the gently undulating Coxs River valley immediately adjacent to

the SCSS. The local topography at the MPPS site is however relatively steep as the site is

situated on a slope with a northeasterly aspect.

The dominant landforms in the region include the wooded hills and slopes of the Ben Bullen State

Forest which occupies the catchment divide and surrounds the MPPS site and dominates all parts

of the Project site that have not been impacted the MPPS or SCSS developments.

3.2 Climate

The climate of the region is considered to be cool–temperate, with mild summers and cold winters.

The local climate is influenced by topography, altitude, and aspect. Monthly mean maximum

temperatures typically range between 12 °C and 28 °C.

3.2.1 Rainfall

Daily rainfall data was obtained from SILO for the Lithgow (Birdwood St) station (BOM station

number 63224). The average annual rainfall for the area is 867.8 mm. This station is

approximately 13 km south-east of the centre WTP site. The data period for this site was taken

from January 1889 to July 2017.

The monthly average rainfall observed is summarised in Figure 2. The distribution of the rainfall

throughout the year is relatively uniform; however, rainfall is generally slightly higher during the

warmer months (October through to March). The maximum monthly average occurs in January of

94.2 mm and the minimum monthly average occurs in September of 57.4 mm. Rainfall intensity is

locally affected by the influence of the Great Dividing Range.

Figure 2 – Monthly Average Rainfall (063224)

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3.2.2 Evaporation

Daily pan evaporation data from the Bathurst Agricultural Station, BoM station 63005, from 1966

to July 2017, is presented in Figure 3. This station is the closest rainfall station, which records the

daily evaporation. This data was used to derive average monthly evaporation rates. The average

daily pan evaporation for the period is 3.7 mm/day.

The evaporation is higher in the summer months (December to February) and lower in the winter

months (June to August). The maximum average evaporation rate of 6.7 mm/day occurs in

January and the minimum average evaporation rate of 1.1 mm/day occurs in June.

Figure 3 – Daily Average Evaporation (063005)

3.3 Geology

The Project area is underlain by Permian rocks of the Shoalhaven group, with occurrences of

early Triassic rocks of the Narrabeen group on top of ridges. The Shoalhaven group is overlain by

the Illawarra Coal Measures in the vicinity of MPPS.

3.4 Surface Water Environment

The Project site is situated in the Upper Coxs River Sub-catchment, which is within the Blue

Mountains Western Catchment managed by the Hawkesbury-Nepean Catchment Management

Authority (HNCMA).

The MPPS WTF site is located primarily south of Wangcol Creek and the WTS will run alongside

Sawyers Swamp Creek and Sawyers Swamp Creek Ash Dam and will then cross the Coxs River

via a horizontal directionally drilled bore.

3.4.1 Wangcol Creek

Wangcol Creek is a perennial stream that joins the Coxs River north of Lidsdale village at “Blue

Lake”, an old open cut mine void. A portion of Wangcol Creek lies nearby the Castlereagh

Highway and its condition in the river valley varies from partly vegetated to cleared and degraded

land.

0

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A number of smaller tributaries enter Wangcol Creek that have headwaters in cleared land, mining

areas, or the Ben Bullen State Forest. The dominant land use in the upstream catchment of

Wangcol Creek is largely forestry with other land uses occupying a relatively small portion of the

catchment area.

3.4.2 Coxs River

The Coxs River is a perennial river that drains a catchment area of approximately 1,700 km2 and

is part of the greater Hawkesbury/Nepean catchment. The river rises within the Ben Bullen State

Forest east of Cullen Bullen and flows generally in a south-east direction through the Blue

Mountains World Heritage Area and into Lake Burragorang (impounded by Warragamba Dam),

which is the primary reservoir for drinking water supply to Sydney.




SECTION 4 ENVIRONMENTAL IMPACT ASSESSMENT KEY FINDINGS AND PREDICTIONS

The key findings and predictions from the EIS that are relevant to this WMP are taken from the

Amended Springvale Water Treatment Project Water Resources Impact Assessment (GHD,

2016b).

The assessment of water resources was undertaken to determine the potential impact of the

Project on the surface water environment in the context of the local water cycle, surface water

quality, the fish community within TCR, stream health and downstream water users. Predicted

impacts are summarised in the following sections.

4.1 Wangcol Creek

The results of the water and salt balance modelling indicated that, for the 50% power generation

scenario, the amended Project is predicted to increase the flow in Wangcol Creek at the

confluence with the Coxs River by up to 2% on average compared to existing conditions and by

up to 4% compared to the do nothing scenario. The electrical conductivity (EC) in Wangcol Creek

was predicted to increase as a result of the discharges from the WCS, by up to 16% compared to

the do nothing scenario. However, future changes in the water management system at WCS are

shown to mitigate this increase, with only a 1% increase in EC compared to existing conditions.

4.2 Coxs River

For the results for the proposed conditions modelled in the 50% power generation scenario,

inflows to Lake Wallace, Lake Lyell and Lake Burragorang from the Coxs River were predicted to

decrease compared to existing conditions and the do nothing scenario. The EC of inflows to the

major reservoirs within the Coxs River was also predicted to decrease compared to both existing

and do nothing scenarios with a 47% to 48% reduction in salinity of flows into Lake Lyell and Lake

Wallace. This occurs as a result of the desalination of mine water make, compared to the

modelled discharge of untreated mine water to Sawyers Swamp Creek in the do nothing scenario.

4.3 Thompsons Creek Reservoir

The water and salt balance modelling results indicated that, for 0% and 25% power generation

scenarios, the use of TCR to store excess treated water is not sustainable over the life of the

Project.

A 50% power generation scenario is considered to best represent the operation of MPPS. The

assessment of the 50% power generation scenario indicated that the operating level within TCR

would need to be reduced to hold excess water during the peak supply of mine water. The

reduction in water level would be approximately 1.2 m below the current operating level. This

predicted change is within the historical fluctuation level of TCR.

The assessment of the 75% and 100% power generation scenarios indicated that the current

operating level of TCR could be maintained (±0.1 m). This is largely due to the fact that 100% of

the water supplied by the Project will be consumed by MPPS over the life of the Project. A power

generation requirement of 61% at MPPS was predicted to be the lower limit to maintain the

current operating level of TCR (±0.1 m).

The assessment of operational scenarios for emergency storage of excess treated water

considered the maximum potential supply of 42 ML/day. The assessment indicated that to




accommodate a five or ten day emergency storage of excess treated water would require an

approximately 0.4 m and 0.6 m reduction in the operating water level in TCR respectively.

The treated water from the proposed WTP is predicted to be considerably less saline than the

water in TCR, with a neutral pH and low concentrations of metals and nutrients. Any effect on the

water quality of TCR will be that of dilution, though minimal change is predicted due to the large

volume of TCR and the improbability of a sustained, high-volume discharge of treated water to the

reservoir.

4.3.1 TCR Downstream Environment and Water Users

Negligible change to the water quality in the downstream receiving environments of Thompsons

Creek and Pipers Flat Creek is predicted. Site specific guideline values (SSGVs) were derived

based on the historical water quality monitoring record for Pipers Flat Creek. No exceedances of

these SSGVs are predicted as a result of the Project.

The Project will not significantly alter downstream water users with respect to quality however

some users may experience an increased variation in surface water flow due to either the removal

of constant flow rates or a greater dominance of natural catchment contributions.

4.3.2 TCR Fish Community

It is considered unlikely that the Project will have an impact on the fish community. The

temperature and the low hardness of the proposed release have the potential to be outside the

ranges of trout tolerance, however these factors are not likely to effect the fish community given

the size and depth of the impoundment.

The distribution of trout species within TCR is predicted to change in response to changes in

water level, due to changes in the availability of preferred habitat, however this is not predicted to

result in any mortality or reduction in survival of the species. The treated water releases are not

predicted to be toxic to any of the fish species in TCR.

The responsibility for the management of TCR will remain with Energy Australia and is not

considered part of the Project.

4.4 Groundwater

There are no likely impacts to the groundwater environment identified as a result of the Project,

due to the minimal groundwater interactions expected with the construction of any additional

pipeline alignments.




SECTION 5 WATER MANAGEMENT PERFORMANCE MEASURES

The following Section details the measures that will be taken to comply with the performance

measures set out in Schedule 3 of the Consent Conditions and as shown in Table 1.

5.1 General

5.1.1 Maintain separation between mine water and treated water management systems

Process flow diagrams are shown in Appendix A. The mine water system including storage and

transfer infrastructure is kept separate from the treated water at all times. The separation is

maintained through a variety of design measures, which are themselves maintained by a

comprehensive asset management process. Further detail on this aspect will be provided once

the design is finalised, prior to commissioning.

The asset management process is detailed in the Operation Management Plan (Veolia, 2017a)

and includes conditions inspections, routine performance assessment and a maintenance

program.

5.1.2 Minimise the use of clean water onsite

Rainwater that falls on the administration and industrial buildings will be reused for toilet flushing,

gardening and wash-down. Rainwater that falls on the plant area roads and hardstand that cannot

be harvested will be directed via drains and culverts to the existing culvert to the west of the WTF

for treatment within MPPS.

Approximately 671 m3/day of treated mine water will be used as service water for the WTF

equipment as required by technological processes.

Potable water will be delivered by truck to provide a potable and non-potable supply to

supplement the rainwater harvesting system when rainfall is insufficient to meet demands.

5.1.3 Design, install, operate and maintain water management systems in a proper and efficient manner

The installation, operation and maintenance of water management systems will be carried out with

adherence to the relevant procedures and standards as detailed in the Operation Management

Plan (Veolia, 2017a).

The following key elements relating to asset management demonstrate adherence with this

condition:

5.1.3.1 Asset management strategy

Veolia’s Asset Management Strategy (PL-ANZ-21-381) seeks to achieve the following asset

management specific high-level objectives:

maintain the level of service (LOS), as detailed in the Operation Management Plan

(Veolia, 2017a), delivered over the duration of the contract term;

manage asset risks and the efficient delivery of services to ensure lowest lifecycle costs;

continuously improve the asset management portfolio of services to achieve best value

for Veolia and their clients.




Veolia will implement an asset management system to enable the physical assets for the Project

to be maintained, repaired, rehabilitated and replaced in such a way as to ensure the following

outcomes:

no drop in level of service delivered over the duration of the contract;

optimum equipment performance, reliability and availability;

minimum total cost of ownership of each asset over its lifecycle;

minimum business risks to all stakeholders;

compliance with all statutory and contractual requirements.

The corporate Asset Management Policy (PO-ANZ-21-391) details the business commitment to

this outcome.

Veolia uses an integrated approach to asset management which considers all aspects of the

asset’s lifecycle including safety, operational performance, level of service, contractual

requirements, maintenance requirements and the asset’s whole of life costs.

5.1.3.2 Asset management system

A Computerised Maintenance Management System (CMMS) will be used for scheduling,

recording and analysing all maintenance activities.

The CMMS comprises an inventory of all managed assets. It includes performance and condition

grading of all asset components, and other relevant data such as capacity, size and age. The

information allows trending of asset condition and performance over the operating period.

The system is also used to capture data relating to all inspection and maintenance activities.

5.1.3.3 Summary of relevant assets and treatment process

The following assets are relevant to the water management system and will be managed in

accordance with the asset management system:

Mine Water Receipt Points - receive mine water;

Water Transfer System - transfer mine water to the WTF;

Mine Water Buffer Pond - receives various streams from the MPPS mixed waters receipt

point and blowdown receipt point 2 before treatment of these streams at the WTF;

Water Treatment Facility (WTF) - treats mine water;

Water Product Delivery Points - transfer the treated water to the MPPS treated water

Delivery Point (TWDP1) and any volumes that exceed the prevailing treated water

demand of MPPS to the Clean Water Pond Delivery Point (TWDP3), and if the clean

water pond is unable to receive that water, transfer all remaining treated water as

stabilised treated water to the Thompsons Creek Reservoir Delivery Point TWDP2;

OPUS Treatment Plant - treats combined blowdown brine from the Cooling Towers and

mine water brine from the Water Treatment Facility at the Brine Treatment Facility;

Brine Crystalliser Plant - the mixed salt crystalliser is the final component of the brine

concentration process. The Crystalliser will receive OPUS RO concentrate from the

crystalliser feed tank and deliver brine concentrates to the brine waste ponds for

subsequent disposal to the Ash Mixing Facility at delivery point BDP1;

Mixed Salt Storage and Transfer System - deliver mixed salt from the Brine Crystalliser to

the Ash Emplacement Delivery Point (SDP1);




Lime Salt Storage and Transfer System - deliver lime salt from the OPUS Treatment

Plant to the Ash Emplacement Delivery Point (SDP2).

5.2 Surface Water Resources

The performance measures specified in the consent conditions relating to surface water resources

require that there are no more than negligible change beyond those predicted in the EIS (GHD

2016a & 2016b) to the following:

surface water flows;

surface water quality;

other surface water users;

channel stability.

Compliance with the performance measures will be assessed through a continuation of the current

monitoring programs conducted by Centennial Coal and Energy Australia. Data will be assessed

against the Contingency Plan (Section 8) and the documented actions will be taken in the event of

a performance measure exceedance.

The existing data collection sites and monitoring data relevant to assessing the Project

performance against the predictions made in the Project EIS are detailed in Section 7.

5.3 Construction and Operation of Infrastructure

5.3.1 Erosion and sediment control

Excessive sedimentation can occur as a result of erosion of exposed soils migrating into drainage

channels and watercourses particularly due to rainfall events. Sedimentation has the potential to

affect the natural flow regime by altering flow rate and direction and decreasing the depth of

channels, which can lead to an increased risk of flooding. It may also affect water quality and

conditions for flora and fauna.

Progressive Erosion and Sediment Control Drawings (PESCD) are designed for use as a practical

guide to manage risks to soil and water associated with construction activities. They may be

produced in conjunction with an Environmental Work Method Statement (EWMS), which provides

more detailed site-specific environmental mitigation measures.

The PESCDs will be consistent with the draft Erosion and Sediment Control Plan (Appendix B).

The draft Erosion and Sediment Control Management Plan (ESCMP) (Veolia, 2017b) has been

documented to define erosion and sediment control processes for implementation by all

employees and subcontractors, whilst undertaking works associated with the Project.

The PESCDs will be displayed prominently in site compounds and will form part of all employee

inductions.

The PESCDs will meet this objective by ensuring that best practice environmental management

measures are incorporated into all stages of the construction activity. All design installation and

maintenance of erosion and sediment controls will be in accordance with the latest version of the

series Managing Urban Stormwater: Soils and Construction. The latest version of the series

Managing Urban Stormwater: Soils and Construction are available at

http://www.environment.nsw.gov.au/stormwater/publications.htm.

Selection of erosion and sediment control measures will involve the following steps:

identifying of the problem to be managed – erosion or sedimentation;

http://www.environment.nsw.gov.au/stormwater/publications.htm




in the case of erosion, differentiate between raindrop impact and concentrated flow;

in the case of sedimentation, identifying if sediment is conveyed by sheet or concentrated

flow;

selecting the appropriate techniques as outlined in appendix F of the Managing Urban

Stormwater: Soils and Construction, Volume 2e.

The PESCDs will be prepared for individual areas four weeks before expected construction

activities that will clearly show the site layout and other matters listed in sections (a) below.

(a) The following background information will be presented in the PESCDs:

location of site boundaries and adjoining roads;

approximate grades and indications of direction(s) of fall;

approximate location of trees and other vegetation, showing items for removal or retention

(consistent with any other plans attached to the application);

location of site access, proposed roads and other impervious areas (e.g. parking areas

and site facilities);

existing and proposed drainage patterns with stormwater discharge points;

north point and scale.

As part of the construction phase of the Project, two key disturbance activities will be required:

WTS installations (above and below ground), boring (horizontal directional drilling);

clearing, regrading and building infrastructure for the WTF.

As part of constructing the WTS, the following control measures will be adopted:

controlled site access locations, with existing access routes to be utilised where possible;

sediment fencing and flow breaks in areas of excessive grade (greater than 5%);

where disturbed catchments yield a sediment volume greater than 150 m3 /year, a

sediment basin will be used;

diversion of clean water around disturbance activities using temporary lined channels or

appropriate located pipes; windrows of won material can also be utilised to protect the

trenching site;

clearance of approximately 10 m of easement in locations where no easement already

exists;

clearance will be undertaken as required during construction leaving mulch as

groundcover while construction works are being undertaken;

excavated spoil material will be placed on the down slope side of the trench;

rehabilitation of the trench is to occur within 10 days of the backfilling (IECA 2000);

stabilisation method can take a suitable form that will applicable to the conditions of the

disturbance activity with a default condition being the application of jute matting.

With the construction of the WTF, the following control measures will be adopted:

clean water diversions for management of the southern catchment;

sediment fencing around the majority of northern perimeter of the site;

controlled site access location, with existing access routes to be utilised where possible;

isolation fencing to clearly demarcate construction areas from operational areas from

within the existing MPPS;

where disturbed catchments yield a sediment volume greater than 150 m3 /year, a

sediment basin will be used;




rolled erosion control products reduce erosion by completely covering the disturbed area.

rolled erosion control products are easily applied to disturbed areas in an emergency or

where the area requires temporary stabilisation for an extended period of time;

dirty water from site shall be directed into the existing water management system present

at MPPS;

rehabilitation of WTF site will be undertaken using rock mulching material or concrete;

those areas not associated with the plant should be revegetated.

The PESCDs apply to all construction activities that disturb material or have the potential to result

in environmental harm as a result of the migration of material from its original location. The plan

endeavours to comply with conditions stated on development approvals, permits, licenses,

sediment control plans and environmental impact assessments.

As a minimum requirement during construction, the maintenance of erosion and sediment controls

will include the following:

general site inspections of construction works undertaken weekly and following significant

rainfall events. During these inspections, water management and sediment control

structures are inspected for capacity, structural integrity, effectiveness and level of

sediment within structures, with the results recorded and reported on where appropriate;

maintenance of the sediment and erosion control measures when visual defects are

observed;

maintenance of groundcover in areas of rehabilitation;

sediment trapped behind fences is to be cleaned out and appropriately stockpiled;

the maintenance of all erosion and sediment control measures are required until

disturbance activities and site rehabilitation is complete.

5.3.2 Soils

The following summary of soils information has been taken from the Project EIS. The soil landscapes which apply to the project area (incorporating both the WTF and WTS sites) and associated characteristics are detailed in Table 3 below.

Table 3 – Soil Landscapes and Characteristics (GHD, 2016b)

Site Soil Landscape Typical Terrain Soil Characteristics

WTS Hassans Walls Cliff and steep slopes / open forests and woodlands

Rock fall hazard, steep slopes, extreme water erosion, mass movement, localised shallows soils, high run on, non-cohesive soils.

Cullen Bullen Hill crests Dispersibility, erodibility, hard setting surface, acidity, low fertility, low wet bearing strength.

Newnes Plateau Gently undulating wide crests and ridges

Acidity, high permeability, low fertility, aluminium toxicity, localised shallow soils.

Deanes Creek Narrow low lying valley swamps along drainage lines and open woodlands

High water tables, permanent water logging, acids soils, low fertility, high run on.

Mount Sinai Narrow undulating crests and steep side slopes

Extreme water erosion, rock, outcrop, steep slopes, acidity, highly permeable soils, low fertility.

Lithgow Lower slopes and poorly drained areas

Hard setting surface, acidity, aluminium toxicity, low fertility, high run on, permanent high water table, water logging, foundation hazard, acidity, low fertility.

Pipers Flat Alluvial areas Low organic matter, erodibilty, hard setting surface, low permeability, acidity, aluminium toxicity, low fertility, low wet




Site Soil Landscape Typical Terrain Soil Characteristics

bearing strength.

WTF Lithgow Lower slopes and poorly drained areas

Hard setting surface, acidity, aluminium toxicity, low fertility, high run on, permanent high water table, water logging, foundation hazard, acidity, low fertility.

The majority of the WTF site is located in an area of disturbed terrain. The Soil Landscapes of the Wallerawang 1:100,000 Sheet map and report (1993), classifies the disturbed terrain as follows:

Landscape: made land on various geologies (unconsolidated);

Soils: Dominated by Anthroposols in disturbed areas. Here most of the original soil has

either been removed, buried or greatly disturbed. In gravel pits and quarries bedrock is

often exposed whilst in landfill areas of transported earths, sediment and industrial,

building and household wastes are found. These areas may be artificially topsoiled or

covered by concrete and bitumen.

5.3.3 Acid Sulfate Soils

A review of the Lithgow Local Environmental Plan 2014 indicated that there are no known occurrences of Acid Sulfate Soils within and/or adjacent to the WTF and WTS sites.

No suspected Acid Sulfate Soils were observed in the material excavated during the Baseline Contaminated Site Investigation, undertaken by Jacobs in August 2017, because fill and natural soil did not exhibit the following characteristics (as defined in the ASSMAC 1998):

Fill and soils did not exhibit a sulphurous smell

There was no evidence of shell

No jarositic horizons or substantial iron oxide mottling was observed; or

Fill and soils were not classified as unripe muds (soft, buttery, blue grey or dark greenish

grey) or estuarine silty sands or sands (mid to dark grey) or bottom sediments of estuaries

or tidal lakes (dark grey to black).

5.3.3.1 Potential contaminated soil / material encountered during construction

An Unexpected Discovery of Contaminated Land Procedure will be developed prior to the

commencement of earth works / excavation. This procedure will detail the actions to be taken if

potentially contaminated soil / material is encountered during excavation / construction activities.

The Environmental Nominee shall notify the representatives of Energy Australia and/or Springvale

Coal, and/or Western Coal Services Coal immediately. In consultation with the representatives,

the Environmental Nominee is to assess the situation and if considered necessary, commission a

suitably qualified contamination specialist to undertake a contamination investigation in the area of

the find. All material to be disposed off-site is to be classified in accordance with the NSW Waste

Classification Guidelines (EPA, 2014). If necessary, the Environmental Nominee will liaise with the

relevant authorities to determine the appropriate management options.

5.3.4 Controlled activities on waterfront land

Construction activities within 40m of watercourses are regulated by DPI Water under the Water

Management Act (2000). An approval will be sought prior to construction of the pipeline and

associated infrastructure and all activities will be in accordance with the Guidelines for Controlled

Activities on Waterfront Land (DPI 2007).




5.3.5 Waterway crossings

The construction of the WTS will involve crossing ephemeral drainage channels on the Newnes

Plateau and the Coxs River. Potential risks to surface water and groundwater values associated

with the construction of the Project may include:

erosion of exposed soils within the construction area and transport of sediment into

drainage channels and watercourses particularly as a result of rainfall events (Section

5.3.1);

disruption to the groundwater and/or surface water flow regime;

contamination due to spills and leaks.

All creek crossing will be designed, installed and maintained in accordance with the Policy and

Guidelines for Fish Habitat Conservation and Management (DPI, 2013) and Why Do Fish Need to

Cross the Road? Fish Passage Requirements for Waterway Crossings (NSW Fisheries, 2003) or

their latest versions.

The PESCDs will be prepared prior to commencement of the waterways crossing construction

works and will be provide to WaterNSW four weeks beforehand for their review and comment.

The current plans for the waterway crossing are as follows:

5.3.5.1 Ephemeral Channels

The ephemeral drainage lines within the Newnes Plateau will be crossed via the following

methodology:

temporary diversion of the creek (if flowing) around the crossing site;

emplacement of a culvert within the existing creek channel (culvert sizing to be finalised

during Project design);

construction of the pipeline over the culvert;

removal of temporary diversion and reinstatement of the creek in the original channel with

the installed culvert.

The PESCPs will be prepared prior to commencement of construction works. Amended sections of the plan relating to the waterways crossing will be provide to WaterNSW four weeks beforehand for their review and comment.

5.3.5.2 Coxs River

The Coxs River waterway crossing will be achieved through Horizontal Directional Drilling (HDD)

of one bore approximately 1.2 km long. The bore will be drilled from east of Wolgan Road and will

cross beneath Wolgan Road, the Castlereagh Highway, the Coxs River and Bray’s Lane.

If the site investigations prior to drilling determine that the bore will intercept the water table then

measures must be taken to minimise the interaction with groundwater such as appropriately

weighted drilling muds. It is noted that the installation of pipelines where a WAL is not required is

considered a minimal impact aquifer interference activity according to the Aquifer Interference

Policy (DPI Water, 2012).

5.3.6 Uncontrolled Discharge

Any loss of pipeline pressure due to leakage will be detected by flow meters installed on the

upstream and downstream ends of the pipeline. The automatic shut down of the vent valve will

occur in approximately 15 minutes, which will isolate area where the leakage is detected.




Preventive and corrective maintenance will be conducted throughout the operation of the Project

to minimise the risk of potential pipeline rupture. An emergency response team will be set up prior

to the commencement of operation and will be available 24/7. An integrated emergency response

plan will be developed in consultation with Springvale Coal and Energy Australia to ensure all

Project personnel have the required awareness and training to adequately deal with emergencies.

5.4 Brine and Residual Waste

A brine and residual waste disposal plan will be developed prior to commission of the Project in accordance with Schedule 3, Condition 5 of the Development Consent (SSD 7592). Following consultation, the plan will be submitted to the Department of Planning and the Environment (DPE) at least two months prior to commissioning of the Project.

5.5 Chemical and Hydrocarbon Management All chemical and hydrocarbon management will be undertaken as follows and in accordance with Australian Standard AS1940-2004 and other relevant Australian standards as applicable.

5.5.1 Chemical delivery and transfer

All tankers delivering chemicals to site will conform to the relevant standard, and follow the Australian Dangerous Goods Code requirements (where applicable).

Chemical Deliveries will be managed in accordance with a work instruction (to be developed) describing the unloading and recording of bulk chemical deliveries.

5.5.2 Chemical storage

Bulk storage areas for chemicals are contained within purpose-built impervious bunds to retain

any spills and prevent contamination of stormwater run-off.

Large capacity spill kits will be provided around the chemical storage area. Any spillage will be

immediately contained and/or absorbed with a suitable absorbent material as far as practicable.

Storage systems are designed to ensure that incompatible materials are kept separate. Safety in

design principles have been applied during the design of the plant to ensure that systems do not

allow any dangerous mixing of incompatible chemicals.

All site staff will be trained in chemical handling and spill management.

A copy of the site manifest and chemical Safety Data Sheets (SDS) will be kept in a cabinet at the

entry to site. Chemical SDS will be stored and accessible at the chemical storage areas.

5.5.3 Chemical dosage

Dosage is controlled by the Supervisory Control and Data Acquisition (SCADA) system and is

described in the relevant Functional Description Specification (FDS).

5.5.4 Chemical handling

Chemical Deliveries will be managed in accordance with a work instruction (to be developed)

describing the unloading and recording of bulk chemical deliveries.

5.5.5 Chemical quality management

The quality of chemicals used on site complies with specifications provided by the chemical

suppliers and further Certificates of Analysis (CoA) can be required from the suppliers. Further

checks and laboratory analysis can also be performed upon delivery of the chemicals to confirm

their quality.




SECTION 6 SITE WATER BALANCE

Figure 4 – Site Water Balance

WBS002




A summary of the predicted inputs and outputs of the system is shown in Table 4. It should be

noted that at the time of writing the Project design was ongoing. Therefore, the estimates

presented in Table 4 should be considered indicative and subject to change. Estimates will be

updated prior to Project commissioning.

Table 4 – Water Balance Summary Predicted Inputs and Outputs

Inputs Predicted Daily Volume (ML/d)

Mine dewatering facilities 0 - 42

Thompsons Creek Reservoir 0 - 42

Direct rainfall onto storages <0.1

Total 0 – 42.1

Outputs Predicted Daily Volume (ML/d)

Thompsons Creek Reservoir 0 - 42

Evaporation from cooling water system 0 – 38

Residuals to REA 0 – 0.43

Brine co-disposal ~ 0.2

Total 0 – 42.63




SECTION 7 MONITORING PROGRAM

7.1 Existing Monitoring Program and Baseline Data

With respect to addressing Schedule 3, Condition 4b of the Consent Conditions; the baseline

datasets and continued monitoring considered relevant to assessing the predictions made in the

Project EIS (GHD, 2016b) are shown in Table 5 and Figure 5.

Following consultation with DPE it was considered that the collection and reporting of data that is

also undertaken as part of the commitments of Energy Australia and Centennial Coal would not be

required under this WMP.

The upstream and downstream extents of the project are described in Section 1.1. The monitoring

sites required to assess the predictions made in the Project EIS (Table 5) are beyond these

extents. Table 5 details which entity will be collecting and reporting on the relevant data.

The monitoring commitments under this WMP pertain to the quantity and quality of treated water

and residuals being transferred from the WTF to TCR and the REA respectively. These

commitments are detailed in Section 9.

Table 5 – Baseline Data Collection Sites and Current Monitoring Programs

Watercourse Monitoring Sites Data Owner Current Monitoring Program

N/A LDP006 Western Coal Services Volume and quality

Daily, monthly and quarterly during discharge

Wangcol Creek Wangcol Creek Gauge Western Coal Services Monthly water quality sampling

Wangcol Creek Wangcol Creek Upstream (US) Western Coal Services Monthly water quality sampling

Wangcol Creek Wangcol Creek Downstream (DS) Western Coal Services Monthly water quality sampling

Wangcol Creek Wangcol Creek Far Downstream (DS) Western Coal Services Monthly water quality sampling

Coxs River Coxs River (Delta Site)

Downstream of Lake Wallace Springvale Coal Biannual water quality sampling 1

Thompsons Creek Reservoir

TC1 Energy Australia Monthly / Weekly water quality sampling 2

Thompsons Creek Confluence Thompsons Creek and

Pipers Flat Creek Energy Australia

One event prior to the Project EIS

At least quarterly water quality sampling recommended

Pipers Flat Creek PFup Energy Australia Monthly / Quarterly water quality sampling

Biannual aquatic ecology monitoring

Coxs River CR5 Centennial Coal Biannual aquatic ecology monitoring

1. Minimum frequency of historical data (GHD, 2016b)

2. Frequency increased from Monthly to weekly in May 2016 (GHD, 2016b)




Figure 5 – Monitoring Locations




7.2 Program to Augment Baseline Data

Given the comprehensive data collection already underway in the Upper Coxs River Catchment it

is considered that the current monitoring programs conducted by Centennial Coal and Energy

Australia continue and that data from the sites shown in Table 5 is used to augment the baseline

data and allow early detection of changes to those watercourses beyond that predicted in the

Project EIS (GHD, 2016a & 2016b).

Water quality monitoring should be conducted on at least a quarterly basis at the Thompsons Creek monitoring site at the confluence of Thompsons Creek and Pipers Flat Creek.

The relevant data owner will provide the baseline data to Veolia on the request.

7.2.1 Water and Salt Balance Update

It is recommended that the predictions made as part of the Project and regional scale water and

salt balances are compared against observational data on an annual basis and the predictions

should be updated every three years or as part of consent modifications that have the potential to

affect the water and salt balance.




SECTION 8 CONTINGENCY PLAN

8.1 Construction

The contingency plans to be adopted during Project construction are documented in the

Construction Environmental Management Plan (CEMP) (Veolia, 2017c). An overview is as follows:

The occurrence of incidents at the Project can potentially impact on other Project activities.

Similarly, incidents that occur in the surrounding area including the local road network can also

impact construction activities.

In the event of an incident, the following measures will be applied:

provide initial response to unplanned incidents with the aim to make incident scene safe,

and prevent further harm to persons or property;

provide support to emergency services, including traffic control in the vicinity of the

incident;

inform affected stakeholders of any incident and provide assistance, if appropriate, for the

duration of the incident;

during major incidents provide a senior construction representative on-site to liaise with

the stakeholder representatives and emergency service agencies;

reschedule planned works that will interfere with the incident, or create additional delays

to those stakeholders already affected by the incident.

8.2 Operation

A variety of contingency measures have been considered as part of the Project design to

accommodate unforeseen circumstances relating to water management including pipeline rupture

and leakage that may occur as a result of general wear and tear, bush fire, falling branches etc.

Such measures will be included in an Operational Environmental Management Plan (OEMP),

which will be reviewed and updated prior to Project commission.

The following design measures will be implemented to reduce the risk of such occurrences:

there will be no valves installed on the residuals pipeline (residuals waste) due to the

water quality. An above ground hydraulic standpipe (9m high) is proposed to be installed

to discharge air regularly during operation, which will prevent any spills;

air vent valves are to be installed along the mine water pipeline to discharge air regularly

during operation; these air vent valves will have a spill prevention system;

a trenched installation will be utilised where necessary to reduce the risks of vandalism,

bushfire damage and mechanical damage from falling branches. The buried depth has

been optimised to allow access whilst providing sufficient thermal protection from

bushfire;

any loss of pressure due to leakage will be detected by flow meters installed on the

upstream and downstream ends of the pipeline. The automatic shut down of the vent

valve will occur in approximately 15 minutes, which will isolate area where leakage is

occurring;

the pipeline will be flexible to accommodate any minor ground movement and will be

oversized to accommodate excess flow.




8.3 WTF Maintenance

The buffer pond shall provide storage to manage water during WTF plant maintenance

activities. The pond has a capacity of 103 ML.

Incoming mine water will typically flow directly to the clarifiers as part of the water treatment

process. A hydraulic standpipe will be configured to allow the flow to be split between the

clarifiers and the buffer storage. Any overflows from the clarifiers, filters and filtered water tank

will also be diverted directly to the buffer pond. Water temporarily stored in the buffer pond will be

pumped back to the water treatment plant for subsequent treatment when capacity is available in

the treatment system.




SECTION 9 PERFORMANCE STANDARDS

The Project has the potential to impact the environment through the quantity and quality of treated

water being discharged into TCR and the quantity and quality of residuals being transferred to the

REA.

A Trigger Action Response Plan (TARP) has been developed to address these aspects and is

detailed in Appendix C. The TARP will be subject to review and update prior to Project

commissioning.

9.1 Quality of Water from the WTF to the TCR

The Treated Water performance standards are presented in Table 6. The electrical conductivity

requirement has been corrected to a reference temperature of 25°C.

Table 6 – Treated Water Performance Standards (Veolia, 2017a)

Water Product Quality Parameter

Unit Water Product Target Standard - From Services

Commencement Date

50 %ile 95%ile Maximum

Salinity µS/cm 3001 5001 9001

Total Suspended Solids mg/L 10

pH2 pH Unit

Refer to note 2 below

Aluminum (total) mg/L 0.08

Arsenic III mg/L 0.024

Arsenic V mg/L 0.01

Cadmium (total) mg/L 0.0004

Copper (total) mg/L 0.0018

Cobalt (total) mg/L 0.0018

Nickel (total) mg/L 0.013

Zinc (total) mg/L 0.015

Iron (total) mg/L 0.05

Boron (total) mg/L 0.37

Manganese (total) mg/L 0.5

Lead (total) mg/L 0.001

Mercury (total) mg/L 0.0006

Chromium (total) mg/L 0.0005

Selenium (total) mg/L 0.005

Langelier Saturation Index3

> -0.5 <1.0

1. Salinity corrected to 25°C

2. pH of the Treated Water must be between 6.5 and 8.5

3. Langelier Saturation Index only applies to Stabilised Treated Water delivered to the Thompsons Creek Reservoir

Delivery Point (TWDP2).

The WTF has been tailored to accommodate a specific mine water quality envelope. Where the

quality of incoming mine water is materially out of envelope a mechanism is in place to manage

the conditions and maintain the treated water performance standards shown in Table 6. An




overview of this mechanism is as follows.

24 hours written notice to request a reduction in flow to a specified rate;

assessment of the requirement for additional pre-treatment of incoming water;

assessment of the requirement for re-treatment if treated water performance standards

have not been met;

Complete details are provided in the operational management plan (Veolia, 2017a) and the

relevant actions and responses are shown in the TARP (Appendix C).

The operation of the TCR and any associated discharges will be under the management of

Energy Australia.

9.2 Quantity and Quality of Residuals from the WTF to the REA

The performance standards regarding quantity and quality of discharge to the WCS REA are

shown in Table 7.

Table 7 – Residuals Performance Standards (Veolia, 2017a)

Water Product Quality Parameter

Unit Water Product Target Standard

Minimum Maximum

Flow (daily)1 m3/d 0 4301

Flow (annual average)2 m3/d 0 3,502

pH 6.5 8.5

Temperature ºC 40

Electrical Conductivity3 µS/cm 2,5003

1. Maximum flow limit applies to the total flow inclusive of all wastes and flushing water on a daily basis

2. Maximum flow limit applies to the total flow inclusive of all wastes and flushing water on a 12 monthly basis

3. Electrical Conductivity corrected to 25°C

The electrical conductivity requirement has been corrected to a reference temperature of 25°C.

The transfer of residuals to the REA is predicted to lead to increased discharge from LDP006,

which is managed by EPL3607 and the WCS water management plan.

9.3 Quality Parameters Compliance Monitoring

A frequency of quality monitoring and sampling collection to be undertaken is outlined in Table 8

below.

A rationality of the treated water compliance monitoring will be assessed based on results from

the treated water monitoring undertaken and if necessary compliance monitoring parameters will

be revised.

Table 8 – Quality Parameters Compliance Monitoring and Sampling (Veolia, 2017a)

Monitoring Point Quality Parameters Monitoring Frequency

Program

Treated Water at the Thompsons Creek Reservoir Delivery Point

Conductivity uS/cm

Turbidity

pH

Continuous online

Total Suspended Solids mg/L

Aluminium (total) mg/L

Arsenic III mg/L

Arsenic V mg/L

Cadmium (total) mg/L

Cobalt (total) mg/L

Weekly




Monitoring Point Quality Parameters Monitoring Frequency

Program

Nickel (total) mg/L

Zinc (total) mg/L

Copper mg/L

Iron (total) mg/L

Boron (total) mg/L

Manganese (total) mg/L

Lead (total) mg/L

Mercury (total) mg/L

Chromium (total) mg/L

Selenium (total) mg/L

Residuals at the Residuals Delivery Point

Conductivity uS/cm

Temperature deg

pH

Continuous online

Total Suspended Solids mg/L

Iron (total) mg/L Weekly




SECTION 10 REPORTING AND REVIEW

10.1 Annual Review

The conditions of consent stipulate that by the end of March each year, the Applicant must submit

a review of the environmental performance of the development for the previous calendar year to

the satisfaction of the Secretary. Results from the surface water monitoring undertaken in

accordance with this WMP and will be reported in the Annual Review as discussed in section 4.11

of the CEMP (Veolia, 2017c).

10.2 Incident Reporting

Incident response and incident reporting procedures will be completed in accordance with the

Development Consent Schedule 4, Condition 6, which states that the Applicant must:

notify the Secretary and any other relevant agencies of any incident that has caused, or

threatens to cause, material harm to the environment;

notify the Secretary and any other relevant agencies as soon as practicable after the

Applicant becomes aware of the incident for any other incident associated with the

development; and

within 7 days of the date of the incident, provide the Secretary and any relevant agencies

with a detailed report on the incident, and such further reports as may be requested.

In accordance with Section 153 of the POEO Act, EPL holders have a duty to notify “relevant

authorities” as specified in the POEO Act (the EPA, local authority, Ministry of Health, Work Cover

Authority and Fire and Rescue NSW) of pollution incidents where material harm to the

environment is caused or threatened. Material harm includes actual or potential harm to the health

or safety of human beings or to ecosystems that is not trivial or results in actual or potential loss or

property damage of an amount over $10,000.

A detailed environmental incident response procedure has been developed for the construction of

the Project and is shown in section 4.5 of the CEMP (Veolia, 2017c).

10.3 Review and Revision

This WMP and associated TARP has been developed at the beginning of the Project design

phase and will therefore require updating as the design evolves. It is recommended that a review

is undertaken once the design is finalised and prior to the commencement of operation of the

Project.

Review and revision of this WMP must be done in accordance with the Development Consent

Schedule 4, Condition 4 which states:

The Applicant must:

update the strategies and plans required under this consent to the satisfaction of the

Secretary prior to carrying out any decommissioning activities on site; and

review and, if necessary, revise the strategies and plans required under this consent to

the satisfaction of the Secretary within 1 month of the:

o submission of an incident report under condition 5 below; or

o any modification to the conditions of consent.




10.4 Stakeholder Consultation Protocol

Details in relation to community liaison, complaints handling, reporting and record keeping,

applicable to the Project stage can be found in a Stakeholder Management Plan appended to the

CEMP (Veolia, 2017c).

10.5 Roles and Responsibilities

Energy Australia holds EPL 13007 for the operation of MPPS. Energy Australia and Springvale

Coal applied for the Project jointly however; Springvale Coal is listed as holding the development

consent. Veolia is responsible for the design, construction and operation of the Project, which will

take place on the leased premises of Energy Australia.

The roles and responsibilities matrix is shown in Table 9. All parties have confirmed their

commitments.

The following definition applies:

Customer: NSW Energy Australia Pty Ltd and Springvale Coal Pty Ltd (including Western

Coal Services).

Table 9 – Roles and Responsibilities

Areas of Management

Veolia

Responsibilities

Springvale Coal (Customer)

Responsibilities

Western Coal Services (Customer)

Responsibilities

Energy Australia (Customer)

Responsibilities

Energy Australia Environmental Protection Licence (EPL 13007) for Mount Piper Power Station operations

To comply with requirements set up in the Contract between Veolia and the Customer

Nil Nil

To comply with the EPL requirements

New EPL for WTF (if required) – to be determined following EPA consultation

Comply with any Licence as applied to the Owner & Operator of the WTF by the EPA or other Government Body.

Nil Nil Nil

Development Consent (SSD 7592) for the Springvale Water Treatment Project

To operate in accordance with the Development Consent as part of its responsibilities under the Contract between Veolia and the Customer

To ensure that Veolia meets the requirements of Development Consent

Nil Nil

Thompson Creek Reservoir (TCR)

To comply with treated water performance standards for discharge of excess water to TCR (Section 9.1) and requirements set up in the Contract between Veolia and the Customer. Do not adversely affect the current riparian water releases or water quality procedures that currently exist at TCR. Abide by the Licence discharge requirement as applied by the EPA.

Nil Nil

To operate TCR and manage any associated riparian water releases in accordance with the existing water management scheme

To regulate water levels in the TCR in accordance with the existing emergency response scheme




Areas of Management

Veolia

Responsibilities

Springvale Coal (Customer)

Responsibilities

Western Coal Services (Customer)

Responsibilities

Energy Australia (Customer)

Responsibilities

Residuals Emplacement Area (REA) (Development Consent SSD 5579 MOD 1)

To comply with residuals performance standards for discharge of residuals to REA (Section 9.2 of the WMP) and requirements set up in the Contract between Veolia and the Customer

Nil

To operate REA in accordance with relevant requirements of the Brine and Residuals Waste Disposal Plan (to be developed by Energy Australia prior to commissioning of the WTF) and in accordance with the Development Consent (SSD 5579 MOD 1).

To assist in the development of the Brine and Residuals Waste Disposal Plan (e.g. to develop sections of the plan relevant to the REA management system and approvals).

Nil

Ash Repository (Ash and Brine Disposal Area)

To comply with relevant requirements of the Brine and Residuals Waste Disposal Plan (to be developed by Energy Australia prior commissioning of the WTF in accordance with condition 5 of the development consent) and requirements set up in the Contract between Veolia and the Customer

To assist in the development of the Brine and Residuals Waste Disposal Plan as required (e.g. provide information related to brine and salt waste and residuals waste produced by WTF).

Nil Nil

To develop the Brine and Residuals Waste Disposal Plan prior to commissioning of the WTF in accordance with condition 5 of the development consent (SDD 7592) and conditions of approvals for the Ash Repository.

To operate the existing Ash Repository management system in accordance with relevant requirements of the Brine and Residuals Waste Disposal Plan.




SECTION 11 REFERENCES

DPE, 2017. Development Consent. Springvale Water Treatment Project SSD 7592. Dated 19

June 2017.

DPI Water, 2012. Aquifer Interference Policy. Published by the NSW Department of Primary

Industries, a division of NSW Department of Trade and Investment, Regional Infrastructure and

Services. Publication number: 11445

DPI, 2013. Policy and Guidelines for Fish Habitat Conservation and Management. Published by

the NSW Department of Primary Industries, a part of the Department of Trade and Investment,

Regional Infrastructure and Services. Policy Number: TI-O-138

GHD, 2016a. Springvale Water Treatment Project State Significant Development 7592

Environmental Impact Statement. Prepared by GHD. Dated September 2016

GHD, 2016b. Springvale Water Treatment Project Amendment to Development Application.

Prepared by GHD. Dated December 2016

GHD, 2016c. Western Coal Services Project Modification 1 Water Resources Impact Assessment.

Prepared by GHD. Dated November 2016.

GHD, 2017. Western Coal Services Water Management Plan. Prepared by GHD. Dated

September 2017

Landcom, 2004. Managing Urban Stormwater: Soils and Construction. 4th Edition

NSW Fisheries, 2003. Why Do Fish Need to Cross the Road? Fish Passage Requirements for

Waterway Crossings

RPS (2014) Centennial Western Coal Services Water Management Plan. Prepared RPS. Dated

04 August 2014. Document Reference S167I/011e

Veolia, 2017a. Operational Management Plan (in draft). Prepared by Veolia

Veolia 2017b. Erosion and Sediment Control Management Plan. Prepared by Abergeldie and

Veolia

Veolia, 2017c Project Environmental Management Plan. Prepared by Abergeldie and Veolia




APPENDICIES

Appendix A – Process Flow Diagrams




Appendix B – Draft Erosion and Sediment Control Management Plan

Springvale MPPS Water

Treatment Project

Erosion and Sediment Control Plan

SMPPS-O-01-M13-00-06

DOCUMENT CONTROL

Rev Date Revision Comments Prepared by Reviewed by Approved by

0 23/8/17 Draft for internal review Mark McGrath

Abergeldie

Elena Ivanova

Veolia

Huw Thomas

Veolia

1 16/10/17 Revised Draft James Tesoriero Abergeldie

Elena Ivanova

Veolia

Huw Thomas

Veolia


Document: SMPPS-O-01-M13-00-06

Revision Date: 16/10/17 Page 2 of 23

TABLE OF CONTENTS

1 DOCUMENT CONTROL ...................................................................................................................................................3

1.1 APPROVAL ...................................................................................................................................................................3

1.2 DOCUMENT REVISION STATUS ................................................................................................................................3

1.3 DISTRIBUTION (CONTROLLED COPIES) ...................................................................................................................3

2 EROSION AND SEDIMENT CONTROL MANAGEMENT ................................................................................................3

2.1 PURPOSE .....................................................................................................................................................................4

2.2 SCOPE ..........................................................................................................................................................................4

2.3 ABBREVIATIONS & DEFINITIONS ..............................................................................................................................4

2.4 ENVIRONMENTAL LEGISLATION ...............................................................................................................................4

3 OBJECTIVES ....................................................................................................................................................................4

4 RESPONSIBILITIES (Refer BMS005) ..............................................................................................................................6

5 TRAINING AND AWARENESS (Refer HR006) ................................................................................................................6

5.1 EMPLOYEE TRAINING.................................................................................................................................................6

5.2 SUBCONTRACTOR TRAINING ....................................................................................................................................6

5.3 STATUTORY REPORTING ..........................................................................................................................................6

6 ENVIRONMENTAL COMPLAINTS AND NON-COMPLIANCE ........................................................................................6

7 ENVIRONMENTAL EMERGENCY AND INCIDENT RESPONSE ....................................................................................6

8 ENVIRONMENTAL ASPECTS AND IMPACTS ................................................................................................................6

8.1 TOPOGRAPHY .............................................................................................................................................................7

8.2 VEGETATION ...............................................................................................................................................................7

8.3 SOIL TYPE ....................................................................................................................................................................7

8.4 HYDROLOGY ...............................................................................................................................................................8

9 MANAGING THE IDENTIFIED ENVIRONMENTAL ISSUES .........................................................................................10

10 EROSION AND SEDIMENT CONTROL EXAMPLES .....................................................................................................10

10.1 STOCKPILES ..............................................................................................................................................................11

10.2 ROCK CHECK DAM....................................................................................................................................................12

10.3 EARTH BANK (LOW FLOW) .......................................................................................................................................13

10.4 EARTH BANK (HIGH FLOWS) ...................................................................................................................................14

10.5 ROCK SEDIMENT BASIN ...........................................................................................................................................15

10.6 EARTH BASIN (WET) .................................................................................................................................................16

10.7 STRAW BALE FILTER ................................................................................................................................................17

10.8 SEDIMENT FENCE .....................................................................................................................................................18

10.9 MESH AND GRAVEL INLET FILTER .........................................................................................................................19

10.10 KERBSIDE TURF STRIP ........................................................................................................................................20

10.11 STABILISED SITE ACCESS ...................................................................................................................................21

10.12 CONTROL OF WIND EROSION ............................................................................................................................22

11 APPENDIX A – PROPOSED WATERCOURSE CROSSING .........................................................................................23




1 DOCUMENT CONTROL

1.1 APPROVAL

FUNCTION POSITION NAME SIGNATURE DATE

Prepared by HSEQ Manager James Tesoriero 16/10/17

Reviewed by Abergeldie Project Manager David Washington 16/10/17

Approved by Abergeldie Design Manager Jason Liddell 16/10/17

1.2 DOCUMENT REVISION STATUS

Each page of this document bears a document number and revision date. When revisions to the document are issued, the following table will be updated to show the most recent revision level. The revised document will be forwarded to the holders of controlled copies. Recipients are responsible for destroying or marking “superseded” on the previous revision.

REVISION DATE AMENDMENT DESCRIPTION

Any changes within this document that modify either the scope or intent of the original document are highlighted in the right margin by a vertical bar (|).

Where review and revision is deemed warranted, i.e. such as comments received from the Client, or where necessary to reflect changes in contractual or Project requirements, or as a result of an incident then these revisions shall be reviewed by the respective Project Manager and approved by the Construction Manager.

1.3 DISTRIBUTION (CONTROLLED COPIES)

COPY ISSUED TO COMPANY / POSITION DATE

1

2

2 EROSION AND SEDIMENT CONTROL MANAGEMENT

Abergeldie Complex Infrastructure utilise a comprehensive Integrated Management System (IMS), comprising of company operating procedures, processes, safe work practices and supporting documentation which form the basis and minimum criteria by which Abergeldie operate. Formulation of this document does draw upon corporate guidance to ensure that compatibility and that the highest project environmental standards exist.

There are no departures from these sediment and erosion controls as stated herein by the Company unless to adopt a higher safety standard.




Note: Working to ensure environmental sustainability is the responsibility of all employees, whether they are employed by Abergeldie Complex Infrastructure, or employed by our sub-contractors.

Note: Based on the assumption that >250m2 of material will be disturbed – it is a

requirement to develop and implement an Erosion and Sediment Control Management Plan (ESCMP) in accordance with requirements stated within Landcom – Managing Urban Stormwater Guidelines.

2.1 PURPOSE

This Erosion and Sediment Control Management Plan (ESCMP) has been documented to define erosion and sediment control processes for implementation by Abergeldie for our employees and subcontractors, whilst undertaking works associated with Veolia

The purpose of this Plan is to minimise soil erosion and the discharge of sediment to land and waterways as a result of our construction activities.

The Plan will meet this objective by ensuring that best practice environmental management measures are incorporated into all stages of the construction activity.

2.2 SCOPE

The Plan applies to all Abergeldie construction activities which disturb material or has the potential to result in environmental harm as a result of the migration of material from its original location. The scope of works to be undertaken on this project can be found detailed within the Project Management Plan.

2.3 ABBREVIATIONS & DEFINITIONS

OEH NSW Government – Office of Environment and Heritage (formerly Department of Environmental and Climate Change)

EMP Environmental Management Plan

WMP Work Method Procedure

SWMS / JSEA Safe Work Method Statement (otherwise known as Job Safety and Environmental Analysis), is conducted for all tasks undertaken on any project. The SWMS documents the tasks, possible hazards/aspects and describes means of mitigation/prevention to reduce or eliminate the hazard.

2.4 ENVIRONMENTAL LEGISLATION

Applicable legislation, Codes of Practice and other advisory documentation is detailed in the Project Environmental Management Plan.

3 OBJECTIVES

Abergeldie will endeavour to comply with conditions stated on development approvals, permits, licenses, sediment control plans and environmental impact assessments. To this end:

Only clean rainwater is permitted to enter waterways and drains. All other liquids and waste products shall be considered as pollutants.

Material will not be placed in any position that leads to pollution of waterways or drains.




Abergeldie will implement effective erosion and sediment control practices, through the following:

- Assessment of site conditions to identify land contour / slope, location of drainage systems, location of areas with soil disturbance or exposed surfaces.

- Planning the works to minimise the removal of natural vegetation and stabilisers, minimise the amount of site disturbance, minimise the duration of exposure, diversion of runoff from work site, storage of stockpiles of spoil away from areas of existing & / or concentrated runoff, coverage of stockpiles left unattended or not required for extended periods or rainfall is expected, determine the methods of transport when removing or delivering soil & material to site to prevent excessive pollution of surrounding environment.

- Installation of erosion and sediment controls prior to works commencing to prevent erosion and divert sediment from entering drainage systems by the strategic placement of barriers and other control measures.

- Monitoring effectiveness to ensure that the erosion and sediment control methods are adequate and effective.

- Rehabilitation of work area to original pre-construction / pre-excavation condition by regenerating / revegetating the area and possible installation of temporary sedimentation control until area is fully stabilised.




4 RESPONSIBILITIES (REFER BMS005)

Responsibilities of key personnel with regards to implementing this plan are as set out in the Project Management Plan.

The Abergeldie Construction Manager shall be accountable for the implementation of this Erosion and Sediment Control Management Plan and shall be assisted in daily activities by the Abergeldie nominated “Site Management” Environmental representative.

5 TRAINING AND AWARENESS (REFER HR006)

5.1 EMPLOYEE TRAINING

Prior to works commencing all members of the work team will attend a toolbox talk detailing the objectives and requirements of this and any other relevant plans, standards or guidelines.

5.2 SUBCONTRACTOR TRAINING

All subcontractors who perform site work shall receive environmental training as part of induction to ensure that they are aware of Abergeldie’s environmental requirements and commitments.

5.3 STATUTORY REPORTING

Statutory Reporting - Under the relevant state environmental legislation, notification of certain incidents/accidents or dangerous occurrences is to be made to a Statutory Authority.

Any communication required with the NSW EPA shall be limited to the HSEQ Manager and Construction Manager.

6 ENVIRONMENTAL COMPLAINTS AND NON-COMPLIANCE

In the event of an environmental complaint, non - conformance or process breach situation refer to Section 7 of the Project Environmental Management Plan.

7 ENVIRONMENTAL EMERGENCY AND INCIDENT RESPONSE

In the event of an environmental incident or emergency situation refer to Section 8 of the Project Environmental Management Plan.

8 ENVIRONMENTAL ASPECTS AND IMPACTS

Prior to commencement of works, a detailed assessment shall be undertaken to ensure that any potential environmental risks are identified and suitable management strategies are incorporated into the works/operations process to minimise the impact to the environment.

The identification of environmental risk, (i.e. the definition of work activity “Aspects” and the respective potential harm to the environment “Impacts”) shall be documented via one of the following Abergeldie processes:

The SWMS / JSEA, form WHS001-F05

The Project Aspect & Impact Register, form ENV001-F02




8.1 TOPOGRAPHY

The Project is located in an area of significant topographical variation.

The land surface on the Newnes Plateau contains elevations of around 1175 m Australian Height Datum (AHD).

The pipeline alignments drop steeply from the escarpment to LDP009.

The pipeline then traverses undulating terrain to Mount Piper Power Station (MPPS) with land surface elevations ranging from 875 and 1000 m AHD.

8.2 VEGETATION

The majority of the Project area has been previously cleared and substantially modified. It features regrowth native vegetation of varying age and structure. THE EASTERN PORTION (The Newnes Plateau)

Features relatively intact sclerophyll forest and woodland on sandstone substrate. Features relatively rich range of native plant species There are localised areas that have been degraded by impacts associated with timber

harvesting, access tracks and electricity easements. There is notable protected species:

- Tablelands Snow Gum, Black Sallee, Candlebark and Ribbon Gum Grassy Woodland (which is listed as an EEC under the TSC Act);

- Caesia parviflora var. minor (Small Pale Grass Lily) (listed as an endangered species under the TSC Act.); and

- Persoonia hindii, which is listed as an endangered species under the TSC Act.

THE CENTRAL WESTERN PORTION Area is aligned with the existing conveyer and includes extensive areas that have been cleared and converted to exotic pasture. It features:

small remnant patches of woodland on alluvial flats; more extensive forest remnants on higher ground; and a disturbed corridor associated with the conveyer through this entire section.

THE PROPOSED WATER TREATMENT PLANT SITE AT MPPS The area been extensively cleared and modified for construction of the power station and associated infrastructure.

8.3 SOIL TYPE

The soil and rock units encountered during Jacobs’ geotechnical investigation at the MPPS site are summarised below.

Uncontrolled Fill (Unit 1A)

Uncontrolled Filled composed of sand gravel/gravelly sand, with fine to coarse, sub-angular to sub-rounded gravel and containing trace amounts of sandstone, concrete cobbles and boulders. The Uncontrolled Fill reached depths of between 2 and 4 meters below ground level.

Coal Fill (Unit 1B)

Coal Fill was found below the Uncontrolled Fill at layers as thick as 6 meters at the centre of the site and as thin as 0.2 meters at the western and eastern extremities of the site. This




layer comprised of coal fill, which appeared as black sandy/gravelly sand with fine to medium sub-angular to angular coal gravels. Clay and sandstone was occasionally encountered.

Residual Soil (Unit 2)

The Residual Soil typically possessed medium to high plasticity, moist, silty clay. This layer was stiff to hard and graded to weather bedrock with depth. This layer directly undelayed either unit 1A or 1B and ranged in thickness of between 0.2 and 4 meters.

Bedrock (Unit 3)

The bedrock across the site typically consisted of shale and sandstone units with minor coal seams. This layer was typically underlaying Unit 2, but also was found to directly underlay Units 1A and 1B. Depths to rock ranged from 3.5 and 12 meters below the ground surface.

For more information regarding the subsoil conditions refer to Jacobs Geotechnical Investigation Report.

8.4 HYDROLOGY

The Springvale and Angus Place mining operations traverse the catchment divide of the Coxs River and the Wolgan River; whilst the surface facilities lie wholly within the Coxs River catchment. The Coxs River drains a catchment of about 2,630 km2 on the western side of the Blue Mountains and is bounded to the west by the Great Dividing Range, to the north by the upper Colo River catchment, and to the south by the Wollondilly River catchment. A tributary of the Nepean River, the Coxs River flows into Lake Burragorang (behind Warragamba Dam), the largest of Sydney's water-supply reservoirs. Sawyers Swamp Creek is an ephemeral stream located to the east of the Coxs River, below the Sawyers Creek Ash Dam. Sawyers Swamp Creek drains to the Coxs River approximately two kilometres north-west of the existing Springvale Mine LDP009.




The MPPS site is located within the catchment to Wangcol Creek. Wangcol Creek is a heavily modified ephemeral stream. Wangcol Creek drains into the Coxs River approximately three kilometres to the east of the MPPS.




9 MANAGING THE IDENTIFIED ENVIRONMENTAL ISSUES

Aspect Common Erosion & Sediment Management Strategies

Activity adjacent water

bodies (Waterways, dams,

creeks, rivers, canals, sumps,

etc),

Installation of sediment fencing down-gradient of disturbed area. These devices should meet the

minimum requirements of a sediment control device. Refer to examples in Section 10.

Sediment curtains to be installed within waterway, adjacent works or operations.

For on-going works or operations: installation of vegetation buffers i.e. turf stripping, down-gradient

of works or operations.

For activities within the riparian corridor, Controlled Activity Approvals will be accessed via:

http://www.water.nsw.gov.au/water-licensing/approvals/controlled-activity

Disturbed areas (i.e. Roads,

work pads, etc)

If the road or work area is to carry only light to medium traffic flows and light vehicles then the road

shall be gravelled (i.e. gravel/railway ballast/crushed concrete) to suppress dust.

If the road or work area is to carry heavy traffic flows or heavy machinery then sealing with soluble

glue or bitumen emulsion (e.g. PetroTac) shall be applied to the road surface or a dust suppression

regime shall be implemented e.g. wetting down where required (i.e. water cart).

Installation of sediment fencing down-gradient of disturbed area. These devices should meet the

minimum requirements of a sediment control device. Refer to examples in Section 10.

Immediate revegetation following completion of works.

For ongoing works or operations; installation of a sediment detention basin down-gradient of

disturbed area.

For the construction of drainage lines; drain surface should be rock-lined to minimise erosion.

Use established roads only.

Stockpiled Material Installation of sediment fencing down-gradient of disturbed area. These devices should meet the

minimum requirements of a sediment control devices. Refer to examples in Section 10.

Cover material using plastic sheeting to minimise wind erosion and storm water ingress into

material.

Divert all up-gradient flows around stockpiled material.

For on-going stockpiling: installation of vegetation buffers i.e. turf stripping, down-gradient of

stockpiles.

Dust Implement a dust suppression regime e.g. wetting down where required, rubble rock access tracks

(i.e. water cart, sprinklers)

Erecting dust fencing i.e. shade cloth/hessian fencing downwind of problematic areas. Refer to

examples in Section 10.

Revegetation of ongoing problematic areas, wherever possible.

Halting work during windy days

10 EROSION AND SEDIMENT CONTROL EXAMPLES

The following pages depict standard methods of controlling erosion and sediment related pollution. These examples shall be referenced on the Site Erosion and Sediment Control plan – refer to Appendix A of this document. For further details and or alternate options, refer to “Managing Urban Stormwater Guidelines” (Landcom 2004).

http://www.water.nsw.gov.au/water-licensing/approvals/controlled-activity




10.1 STOCKPILES




10.2 ROCK CHECK DAM




10.3 EARTH BANK (LOW FLOW)




10.4 EARTH BANK (HIGH FLOWS)




10.5 ROCK SEDIMENT BASIN




10.6 EARTH BASIN (WET)




10.7 STRAW BALE FILTER




10.8 SEDIMENT FENCE




10.9 MESH AND GRAVEL INLET FILTER




10.10 KERBSIDE TURF STRIP




10.11 STABILISED SITE ACCESS




10.12 CONTROL OF WIND EROSION




11 APPENDIX A – PROPOSED WATERCOURSE CROSSING

Approx. (GDA94 - MGA56)

(Survey to confirm pipe construction is inside the easement)

Location Easting Northing Crossing Final

Installation Crossing Construction Method

Approximate Distance

(m)

Approx. Construction

Duration (Days)

Observations

Base of Escarpment 232522.9791 6301854.052 Buried Cut and Cover - Temporary Diversion or Bypass

5 2 Currently dry, rainwater channel with a raised earth pass over the top for pedestrian access. Amongst heavy undergrowth.

Base of Escarpment 232557.7465 6302014.664 Buried Cut and Cover - Temporary Diversion or Bypass

10 3

Currently dry, rainwater channel with side banks needing access. Amongst heavy undergrowth. Item will end up with a creek crossing at existing bed level and tapered sides to allow for vehicle entry and exit.

Base of Escarpment 232322.1202 6301420.225 Above Ground

on Culvert

Culvert Installation for vehicle traffic - requires some in creek works to found and install the culverts, pipe run above ground on culvert.

35 15 Steep wall both sides, approx. 3m from ground level to creek bed on high side, 2m on other side, creek dry at time of walk (August 2017) and thick undergrowth present.

EA Land near fly ash disposal for

Wallerawang 231592.2641 6301735.191 Buried

Cut and Cover - Temporary Diversion or Bypass.

10 3 Pipe to be in or adjacent to existing track, construct in dry weather - currently dry, and diversion in place / coffer either side of works for duration. Likely 1-2 day construction period.

Coxs River / Castlereagh highway

/ Brays lane 228212.24 6301148.239 Buried

Directional Drill - No disturbance to water at ground in vicinity of crossing- approx. depth is 6m below river bed.

17 30 17m is the approx. length underneath the river. Total HDD is approximately 1200m in length. Location of entry and exit pits is 500 and 700m from the river.

Creek adjacent Cox's river

228044.795 6301205.186 Buried Directional Drill - No disturbance to water at ground in vicinity of crossing- approx. depth is 6m below river bed.

17 30 17m is the approx. length underneath the creek. Total HDD is approximately 1200m in length. Location of entry and exit pits is 270 and 930m from the river.

Adjacent to Coxs River

227969.986 6301236.395 Buried Directional Drill - No disturbance to water at ground in vicinity of crossing- approx. depth is 6m below river bed.

25 30

25m is the approx. length underneath the swamp / wetland. Total HDD is approximately 1200m in length. Location of entry and exit pits is 200 and 1000m from this location.

Existing Pond just south of coal wash

plant 225720.802 6303527.826

Above Ground on Existing

Bridge Structure

Prefab Pipe for installation onto existing pipe bridge and then connected via flanges at each end. Craned into location - Working over water - no disturbance to waterway.

80 2

Existing bridge with concrete bulkheads / supports at each end. Pipe transition concreted in to provide anchorage.

A conceptual ESCMP plan will be provided for each of the above water crossing methods (where relevant), once the method has been confirmed that it will be used.




Appendix C – Trigger Action Response Plan

Aspect Normal Level 1 Level 2 ResponseQuantity of water received frommine dewatering facilities

Quantity is within predictedrange

Trigger:

Supply is above predicted range but withinWTF capacity

Action:

Contact Springvale Mine to assess likelyduration and magnitude of excess supply

Estimate quantity of water to be transferredto TCR

Trigger:

Supply is above predicted range and inexcess of WTF capacity

Action:

Contact Springvale Mine to assess likelyduration and magnitude of excess supply

Assess if excess flows can be managed byWTF capacity and buffer pond storage

Request diversion of flows to utiliseavailable mine site storage options

Estimate any requirement to transfer treatedwater to TCR

Notify Springvale Mine OperationsManager

Notify Energy Australia EnvironmentalCoordinator or Operations Manager

Quality of water received frommine dewatering facilities

Quality is within envelope Trigger:

One or more water quality parameters areout of envelope

Action:

Review operational management plan

Provide 24 hours written notice toSpringvale Mine to request a reduction inflow to a specified rate to allow treatmentprocess to be adjusted accordingly

Assess of the requirement for additional pre-treatment of incoming water

Assess of the requirement for re-treatment iftreated water performance standards havenot been met

N/A Notify Springvale Mine OperationsManager

Quality of treated watersupplied from the WTF to TCR

Quality is within performancestandard measures

Trigger:

Temporary exceedance of treated waterperformance standard for one or more waterquality parameter

Action:

Trigger:

Ongoing exceedance of treated waterperformance standard for one or more waterquality parameter

Action:

Notify Energy Australia EnvironmentalCoordinator or Operations Manager

Document assessment outcomes

Aspect Normal Level 1 Level 2 ResponseInvestigate likely cause

Review influent water quality

Assess Impact to receiving environment

Utilise available storage as required

Investigate likely cause

Review influent water quality

Assess potential impact to receivingenvironment

Utilise available storage as required

Conduct necessary maintenance to addressthe exceedance

Quantity of residuals suppliedto REA

Quantity is within performancestandard measures

Trigger:

Temporary exceedance of residuals flowperformance standard

Action:



Trigger:

Ongoing exceedance of residuals flowperformance standard

Action:




Notify SCSS EnvironmentalCoordinator or Operations Manager

Quality of residuals supplied toREA

Quality is within performancestandard measures

Trigger:

Temporary exceedance of treated waterperformance standard by one or more waterquality parameter

Action:



Assess requirement to temporarily ceasetransfer to the REA and adjust quality ofresiduals

Trigger:

Ongoing exceedance of treated waterperformance standard by one or more waterquality parameter

Action:


Assess potential impact to receivingenvironment


Notify SCSS EnvironmentalCoordinator or Operations Manager

Documents

Springvale MPPS Water Treatment Project · potentially be affected by the proposal Section 7 4 (b) A program to augment the baseline data over the life of the development Section