groundwater management plan - coal combustion product ... · commercial in confidence groundwater...

Prepared for: Eraring Energy PO Box 5044 Dora Creek NSW 2264

Groundwater Management Plan - Coal Combustion Product Management Facility Eraring Power Station, Rocky Point Road, Eraring

AECOM 28 July 2009 Document No.: N6052202 _RPT_FINAL_28July09.doc

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Commercial in Confidence Groundwater Management Plan - Coal Combustion Product Management Facility

N6052202 _RPT_FINAL_28July09.doc

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i N6052202 _RPT_FINAL_28July09.doc

Contents EXECUTIVE SUMMARY.........................................................................................................................1 1.0 INTRODUCTION ......................................................................................................................1 2.0 BACKGROUND .......................................................................................................................3

2.1 Overview ...................................................................................................................3 2.2 Potential Groundwater Impacts .................................................................................3 2.3 Conceptual Hydrogeological Model ...........................................................................4 2.4 Project Approval Requirements for the CCP Facility..................................................4 2.5 Relevant Background Documentation .......................................................................5

2.5.1 Environment Protection Licence .................................................................5 2.5.2 NSW DEC 2007 Guidelines for the Assessment and Management

of Groundwater Contamination ...................................................................5 2.5.3 Land Management Plan (LMP)...................................................................6 2.5.4 Surface Water Management Plan (SWMP) ................................................6

2.6 Other Background Documentation.............................................................................7 2.6.1 Reports.......................................................................................................7 2.6.2 Legislation and Guidelines..........................................................................7

3.0 GROUNDWATER MANAGEMENT PLAN ...............................................................................9 3.1 Objectives..................................................................................................................9 3.2 Scope ........................................................................................................................9 3.3 Overview ...................................................................................................................9 3.4 Review of the Existing Groundwater Monitoring Regime ...........................................9

3.4.1 Existing Groundwater Monitoring Network..................................................9 3.4.2 Survey of Existing Monitoring Wells..........................................................11 3.4.3 Sampling Methodologies for the Existing Groundwater Monitoring

Regime.....................................................................................................12 3.4.4 Existing Analytical Schedule.....................................................................13 3.4.5 Adequacy of the Existing Groundwater Monitoring Network .....................13

3.5 Historical Groundwater Monitoring Results..............................................................14 3.5.1 Overview ..................................................................................................14 3.5.2 Summation of Historical Groundwater Results .........................................14

3.6 Updated Groundwater Monitoring Regime...............................................................15 3.6.1 Installation of Additional Groundwater Monitoring Wells ...........................15 3.6.2 Groundwater Monitoring Parameters........................................................16 3.6.3 Assessment Criteria to be used in GMP ...................................................17

4.0 REPORTING AND REVIEW...................................................................................................19 4.1 Provisions for Periodic Auditing and Reporting of Results to the Director

General....................................................................................................................21 4.2 Management Plan Review.......................................................................................21

5.0 CONCLUSIONS AND RECOMMENDATIONS ......................................................................23 6.0 REFERENCES .......................................................................................................................25



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List of Tables Table 1: Groundwater Monitoring Wells Located During 20 March 2009 Site Visit ................................10 Table 2: Available Survey Details for Monitoring Wells ..........................................................................12 Table 3: Survey Details for Newly Installed Groundwater Monitoring Wells ...........................................16

List of Figures Body Report

Figure 1: Groundwater Management Process .......................................................................................19 Figure 2: Groundwater Monitoring Protocol ...........................................................................................20

Figures Section

Figure F1: Site Location Figure F2: Site Layout Figure F3: Pacific Power Plan of CCP Facility Groundwater Monitoring Network Figure F4: Conceptual Site Model - CCP Site Figure F5: Existing Groundwater Monitoring Well Network Figure F6: Recently Installed Groundwater Monitoring Wells Figure F7: Background Well MW01 in Relation to Currently Monitored and Newly Installed Wells

List of Appendices Appendix A Borelogs – Monitoring Wells in Existing Network Appendix B Borelogs - Newly Installed Monitoring Wells Appendix C Groundwater Sampling Methodologies



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Executive Summary

ENSR Australia Pty Limited (trading as AECOM and hereafter referred to as AECOM) was engaged by Eraring Energy Pty Limited (Eraring) to prepare a Groundwater Management Plan (GMP) for the catchment area of the Coal Combustion Product Management Facility (CCP Facility) located on the Eraring Power Station (EPS) property, 3 & 28 Rocky Point Road and 45 Point Piper Road, Eraring (herein referred to as ‘the Site’).

The GMP has been developed as part of the project approval process for the upgrade of the CCP Facility and will provide guidance for the ongoing management of groundwater that is potentially affected by the CCP Facility. The primary objective of the GMP was to produce a program for the protection and maintenance of groundwater quality in the catchment of the CCP Facility.

The scope of works conducted by AECOM was aligned with the requirements of the Project Approval document for the CCP Facility upgrade and included a review of the existing groundwater monitoring regime, prior to commencing operation of the upgraded CCP Facility and the subsequent development of a new or updated GMP.

Based on review of the available data, the recommendations for the future monitoring program for the CCP Facility catchment are as follows:

• Monitoring wells GM/D1, GM/D2, D26, D29, MW01, MW02, MW03, MW05 and MW06 should be included in future monitoring.

• Heavy metals (arsenic, cadmium, chromium, copper, selenium, lead and zinc total petroleum hydrocarbons (TPH) and polycyclic aromatic hydrocarbons (PAHs) should be monitored biannually.

• Sulphate, chloride and fluoride should be monitored biannually.

• Monitoring for iron is no longer considered necessary as the concentrations have generally remained consistent and are considered to be naturally occurring due to the underlying geology.

• Cations (calcium, magnesium, sodium, potassium), boron, manganese, alkalinity, pH, conductivity, temperature, total dissolved solids, nitrate, phosphorus and anion/cation balance should be monitored quarterly.

• Sampling procedures used for the existing monitoring program were considered to be adequate and are to be used for future monitoring program.

• Subsequent to the 2009 monitoring results from the newly installed wells screened in the deeper aquifer (and if results indicate the same previous trends), consideration should be given to further refining the analytical suite by removal of analytes such chromium, cadmium and possibly manganese.

Based on guidance provided in ANZECC (2000) and the results of historical monitoring, AECOM considers that future results should be compared to a combination of historical results and background concentrations in the first instance, as trend analysis of the historical data indicates little change in parameter concentrations over time. Furthermore, background monitoring and geochemistry of the area indicates that background concentrations for several parameters (including, but not limited to iron, arsenic and manganese) are likely to be naturally elevated.

.



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1.0 Introduction

ENSR Australia Pty Limited (trading as AECOM and hereafter referred to as AECOM) was engaged by Eraring Energy Pty Limited (Eraring) to prepare a Groundwater Management Plan (GMP) for the catchment area of the Coal Combustion Product Management Facility (CCP Facility) located on the Eraring Power Station (EPS) property, 3 & 28 Rocky Point Road and 45 Point Piper Road, Eraring (herein referred to as ‘the Site’), as shown on Figure F1 and the Site layout on Figure F2.

The GMP has been developed as part of the project approval process for the upgrade of the CCP Facility and will provide guidance for the ongoing management of groundwater that has the potential to be affected by the upgrade and ongoing operation of the CCP Facility.



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2.0 Background

2.1 Overview Coal Combustion Product (CCP) is a by-product of electricity generation, produced by the burning of coal and is comprised of fly ash and furnace bottom ash. Approximately 45% of all CCP produced at EPS is sold and reused in other processes such as concrete manufacturing or as a gravel substitute for use in landscaping and roads. The remaining 55% is stored in the CCP Facility, which comprises a large dam located to the north of the EPS. Currently, the CCP Facility holds CCP which is mixed with water at a ratio of 30% CCP to 70% water (lean-phase).

Eraring proposes to upgrade the CCP Facility to increase efficiency and extend the operational life of the EPS. Project Approval (No. 07_0084) for the CCP Facility upgrade was granted by the Department of Planning (DoP) under Section 75J of the Environmental Planning and Assessment (EPA) Act 1979 on 29 April 2008.

As detailed in the Project Approval document (No. 07_0084), the upgrade involves increasing the capacity of the CCP Facility and the introduction of a more concentrated CCP mix comprising 70% CCP and 30% water (dense-phase). The upgrade also involves the installation of new infrastructure comprising of CCP collection, storage, conditioning and pumping facilities to allow for storage and transportation of CCP from the power station to the CCP Facility.

A toe drain collection system intercepts seepage water at the toe of the dam and this water is then returned to the dam.

2.2 Potential Groundwater Impacts Potential impacts to groundwater quality associated with the proposed upgrade and expansion of the CCP Facility are primarily related to the seepage and migration of potentially contaminated groundwater, which could ultimately impact the local groundwater quality, as well as the water quality of receiving waters of Lake Macquarie, such as Myuna Bay.

Recirculated Lake Macquarie water is used to slurry ash for placement in the CCP Facility. Under existing conditions, it is anticipated that there is some seepage and downward vertical migration of saline water used in the conditioning and mixing of fly ash from the CCP Facility after placement. Water seepage through the base of the CCP Facility and seepage water at the toe of the dam that is not collected at the toe drain has the potential to impact local groundwater quality as well as the water quality of groundwater receptors surrounding the Site via leaching of contaminants from the lean phase emplacement, as well as seawater trace element components (such as boron and major ions including magnesium, calcium, potassium and bicarbonate) from the water used for mixing the CCP.

Currently, due diligence groundwater sampling from five monitoring wells is carried quarterly out at the EPS. Quarterly analysis is undertaken for parameters including major ions, boron, manganese and iron. On an annual basis the analytical schedule is expanded to include the following metals: arsenic, cadmium, chromium, copper, selenium, lead and zinc. Additionally, parameters including temperature, pH, conductivity, fluoride and phosphorus are also analysed.

The proposed expansion of the CCP Facility and dense phase placement of fly ash is not anticipated to impact the groundwater quality beneath or down-gradient of the CCP Facility over and above existing groundwater quality. The proposed dense phase placement technique would require significantly less water during the conditioning and mixing process to form the dense phase slurry. This would reduce the quantity of water within the CCP storage facility, which is likely to result in a reduction of seepage to groundwater compared to the current lean phase placement. In addition, the cementious nature of the




dense phase emplacement would likely form a low permeability layer across the surface of the existing lean phase emplacement, as well as across the surface of the proposed expansion area of the CCP Facility. It is anticipated that this would minimise future potential for seepage to groundwater. The proposed implementation of dense phase placement is therefore anticipated to result in a reduction in groundwater seepage in comparison to current conditions.

While the proposed expansion and upgrade of the CCP Facility is not anticipated to adversely impact existing groundwater quality, there is a requirement as part of the Project Approval to produce and implement a GMP.

2.3 Conceptual Hydrogeological Model A conceptual hydrogeological model is useful in assessing the nature and occurrence of groundwater, and the source, pathway and receptors for potential contaminants entering the groundwater system. In this case, the CCP Facility is considered to be the source of potential contaminants and the contaminant transport pathways include seepage through native aquifer material or ash deposits at the toe of the CCP Facility. Anecdotal information suggests that groundwater monitoring wells near the toe of the CCP Facility may be screened, at least partially, within ash deposits of the former Wangi Power Station ash dam foot print area. The nearest groundwater receptors include Crooked Creek, which passes beneath the western shoulder of the dam, and Lake Macquarie, which is located approximately 300 m down-gradient of the dam at the closest point.

Groundwater is anticipated to flow to the south-southeast towards Lake Macquarie. The monitoring wells currently included in the quarterly monitoring program provide limited information on shallow groundwater quality at the toe of the CCP Facility dam and down-gradient of the dam.

As the completion details of some of the groundwater monitoring wells are unknown, it is difficult to assess the aquifer, or material, being monitored in these wells. It is understood that only shallow groundwater monitoring wells (i.e. up to approximately 4 m deep) were installed previously at the Site, and that some of the monitoring wells may potentially be monitoring groundwater quality within ash deposits of the former Wangi Power Station ash dam. Anecdotal evidence from Eraring personnel and several bore logs for the previously installed wells indicate that ash deposits up to 3.5 m thick from the Wangi Power Station were present beneath the toe of the current CCP Facility dam.

It is understood that the original background (up-gradient) monitoring well at the Site (D3), which was located in the vicinity of the recently installed MW01 shown on Figure F7, was often dry and had not been monitored since 2002. Therefore, monitoring well D3 has only provided limited background groundwater quality information regarding groundwater quality entering the site. Monitoring well MW01, installed by AECOM in November 2008, replaced monitoring well D3 and will facilitate monitoring of the background quality of the groundwater entering the site.

Additionally, it is noted that limited information is available with respect to where and how groundwater discharges from the Site into Lake Macquarie.

The Conceptual Site Model (CSM) illustrating the potential contaminant source-pathway-receptor (pollutant linkages) affecting groundwater, as assessed from data review and monitoring well records, is included as Figure F4.

2.4 Project Approval Requirements for the CCP Facility The Project Approval (No. 07_0084) document issued by the Minister for Planning under Section 75J of the Environmental Planning and Assessment Act 1979 for the CCP Facility upgrade (dated 29 April 2008), requires that Eraring design and construct the CCP Facility expansion in a manner that does not intercept the underlying groundwater. The Project Approval (07_0084) document requires that:




• for the staged expansion of the CCP Facility, in conjunction with changes in the CCP disposal method from lean phase to dense phase, a review of the existing groundwater monitoring regime be undertaken and any existing GMP be updated, of which a copy shall be submitted to the Director General for approval prior to implementation.

The Project Approval (No.07_0084) document also sets out groundwater monitoring requirements for the CCP Facility, which requires that EPS shall undertake a review of the existing groundwater monitoring regime and update any existing Groundwater Management Plan accordingly.

2.5 Relevant Background Documentation In addition to complying with the Conditions of the Project Approval document (No. 07_0084), the GMP has been aligned with, and should be read in conjunction with, the following documents:

• Eraring Power Station Environmental Protection Licence (EPL) (No.1429);

• Guidelines for the Assessment and Management of Groundwater Contamination, dated 2007 (NSW DEC 2007);

• Eraring Land Management Plan (LMP), Eraring Energy Lands, Eraring NSW, 7 September 2007 (HLA ENSR 2007); and

• Surface Water Management Plan (SWMP), Eraring Energy Lands, Eraring Power Station, NSW, 11 July 2008 (ENSR 2008).

These documents are discussed in the following Sections.

2.5.1 Environment Protection Licence EPS is subject to an Environment Protection Licence (EPL No. 1429), under the Protection of the Environment Operations Act 1997 (POEO Act 1997). The EPL sets out Conditions for the undertaking of any potentially polluting activities on the Site and has been considered throughout the GMP.

The EPL sets water discharge limits and includes requirements for the monitoring of pH and total suspended solids (TSS) at the emergency CCP Facility outlet located in the culvert under Wangi Road.

The EPL does not contain requirements to monitor groundwater or for the implementation of a GMP, and all groundwater monitoring to date has been undertaken by EPS as a voluntary, due diligence exercise.

2.5.2 NSW DEC 2007 Guidelines for the Assessment and Management of Groundwater Contamination

Groundwater clean-up guidance is provided in the DEC (2007) Guidelines for the Assessment and Management of Groundwater Contamination. DEC policy is that where groundwater contamination has been identified, the objective of any remediation or management should be “to protect human and ecological health and to ultimately restore the groundwater to its natural background levels”. To achieve this objective, DEC states that, at a minimum, the following management strategies must be considered:

• Control short term threats arising from the contamination;

• Restrict groundwater use;

• Prevent or minimise further migration of contaminants from source materials to groundwater;

• Prevent or minimise further migration of the contaminant plumes; and




• Clean-up of groundwater to protect human and ecological health, restore the capacity of the groundwater to support the relevant environmental values and, as far as practicable, return groundwater quality to its natural background levels.

2.5.3 Land Management Plan (LMP) In addition to the requirements of the Project Approval document (No. 07_0084), AECOM identified key performance indicators (KPIs) relating to groundwater management at the Site in the Eraring Land Management Plan (LMP), Eraring Energy Lands, Eraring NSW, 7 September 2007 (HLA ENSR 2007).

These KPIs, which have been updated based on the current understanding of the Site and considered in the production of this GMP, were as follows:

• All groundwater monitoring locations to be recorded and updated annually on Eraring Energy’s GIS;

• GIS data to be collated and used to establish a baseline year (2006) from which changes can be assessed;

• All groundwater samples to be assessed against relevant NSW DEC (2007) guideline values;

• Aim for no adverse impacts to groundwater (above background) from analytes (as per NSW DEC guidelines); and

• Mitigation measures to be in place and activated within a timely manner for incidences relating to groundwater quality.

2.5.4 Surface Water Management Plan (SWMP) AECOM produced the Surface Water Management Plan (SWMP), Eraring Energy Lands, Eraring Power Station, NSW, 11 July 2008 (ENSR 2008), as a supplement to the LMP (HLA ENSR 2007), to identify and provide guidance for the management of surface water across Eraring owned lands.

The SWMP (ENSR 2008) presented existing and proposed strategies for the management of clean and used surface water at the Site with regards to monitoring and reporting requirements. The SWMP (ENSR 2008) also defined KPIs for surface water management at the Site.

The KPIs presented in the SWMP (ENSR 2008), which have been considered in the production of this GMP, were as follows:

• By the end of 2007 all surface water monitoring sites to be recorded and updated annually on Eraring Energy’s GIS;

• GIS data will be used to establish a baseline year (2006) from which changes can be assessed. This data will be collated by the end of 2007;

• Clean and used water to be managed as separate entities across the Site;

• All water discharged from the Site is to comply with EPL No. 1429, that is:

- Zero licence exceedences in relation to water quality for all water discharged from the Site; and

- Zero licence exceedences in relation to water quantity for all water discharged from the Site;

• Mitigation measures to be in place including:

- An up-to-date Surface Water Incident Mitigation Protocol;




- Up-to-date Emergency Response Plans;

- All on-Site emergency response equipment to be readily available and well maintained; and

- Oil / water detectors to be in good working order.

2.6 Other Background Documentation 2.6.1 Reports The following additional reports have been referred to as necessary in the preparation of this GMP:

• HLA ENSR (2007), Environmental Assessment, Upgrade and Expansion of the Coal Combustion Product Management Facility, Eraring Power Station, dated November;

• HLA ENSR (2007), Ash Dam Groundwater Assessment – Stage 1 Progress Report, (letter report), dated 12 June; and

• HLA Envirosciences Pty Ltd (2006), Groundwater Monitoring Review, Eraring Power Station, dated 10 May.

2.6.2 Legislation and Guidelines The following legislation and guidelines have been considered in the preparation of the GMP for CCP Facility catchment:

• Contaminated Land Management Act (CLM Act) 1997 and the Contaminated Land Management Amendment Act 2008;

• Protection of the Environment Operations (POEO) Act 1997;

• Water Act 1912;

• Water Management Act 2000;

• ANZECC (2000), Australian and New Zealand Guidelines for Fresh and Marine Water Quality; and

• NSW DEC (2007), Guidelines for the Assessment and Management of Groundwater Contamination, dated 2007 (NSW DEC 2007).




3.0 Groundwater Management Plan

3.1 Objectives The primary objective of the GMP is to produce a program for the protection and maintenance of groundwater quality in the catchment of the CCP Facility. This will be achieved through compliance with the requirements of the CCP Facility Project Approval document (No. 07_0084) and alignment of the GMP with the Environment Protection Licence (EPL No. 1429) and the KPIs identified in the LMP.

3.2 Scope The scope of works for the GMP has been aligned with the requirements of the Project Approval document for the CCP upgrade (No. 07_0084), as follows:

• Undertake a review of the existing groundwater monitoring regime prior to commencing operation of the upgraded CCP Facility. This review should include, but will not necessarily be limited to:

- Survey of existing monitoring wells;

- Review of parameters and pollutants to be monitored, including procedures and protocols for sampling and testing;

- Review of the adequacy of existing groundwater monitoring network at the EPS to assess whether current contaminant concentrations at receiving waters originate from existing activities associated with the power station, including the existing CCP storage facility;

- Installation of additional groundwater monitoring wells, both up- and down-gradient of the CCP storage facility;

- Details of groundwater quality limits that would indicate impacts from the CCP storage facility, particularly as a result of seepage, and a contingency response plan in the event that impacts are identified; and

- Provisions for periodic auditing and reporting of results to the Director-General.

• Revise the existing groundwater monitoring regime, as necessary, and update any existing GMP in accordance with the groundwater monitoring review. A copy of the updated GMP shall be submitted to the Director-General for approval prior to its implementation.

3.3 Overview The following Sections present the information obtained from the review of the existing groundwater monitoring network and detail recommended future groundwater monitoring and assessment, as required by the CCP Facility Project Approval (No. 07_0084) document.

3.4 Review of the Existing Groundwater Monitoring Regime 3.4.1 Existing Groundwater Monitoring Network A plan produced by Pacific Power International - Ash Disposal Area - dated 29 January 1997 (included as Figure F3), shows the locations of the 43 monitoring wells comprising the well network down-gradient of the CCP Facility and the ground conductivity survey lines. The plan indicated that the monitoring wells were installed in 1985 by Pacific Power.




Six of the existing monitoring wells (GM1/D1, GM1/D2, D3, D26, D27 and D29) have been monitored on a quarterly and annual basis since 1997 by Aurecon. There have been two wells noted on the above plan as D3, one located immediately down-gradient of the toe of the dam and the other located up-gradient as a background monitoring well, which was replaced in November 2008 by MW01 as this monitoring well has been dry, and since March 2002 there has been no groundwater recorded at this location. It is noted that all historical monitoring results for D3 provided to AECOM relate to sampling from the up-gradient background well. Monitoring well D27, which is outside Eraring property, was damaged and lost, possibly as a result of previous Council mowing works.

Of the original monitoring wells, the following are currently monitored, see Figure F5:

• GM1/D1;

• GM1/D2;

• D26; and

• D29.

These monitoring wells are located near the toe of the CCP Facility (GM1/D1 and GM1/D2) and south of Crooked Creek (D26 and D29 - some 350 m south of the CCP Facility) as shown on Figure F7. Historically, these monitoring wells were selected as representative monitoring wells for any groundwater migrating radially and south of the CCP Facility area.

On 20 March 2009, a Site visit was undertaken by AECOM, accompanied by Eraring personnel. During the Site visit, the depth to water and total monitoring well depths of accessible monitoring wells were measured. The construction method for groundwater monitoring wells at the Site is unknown, but Site observations indicate that it is likely that industry standard construction practices had been employed.

During the Site visit, it was observed that the majority of monitoring wells (including all currently monitored monitoring wells) were completed with a PVC pipe stick-up and top cap to minimise the ingress of rainwater or debris. The PVC was observed to be generally in good condition. However, AECOM noted during a previous Site visit on 16 March 2006 that there was evidence of UV radiation deterioration of the PVC pipe due to direct exposure to sunlight.

Only two of the monitoring wells (MW01 and D26) were completed with a steel monument cover. He monument for MW01 was padlocked, although there was no lock on the monument at D26. The erection of a steel monument is common practice at sites where monitoring well integrity is a possible issue. Table 1 below presents the well information obtained during the Site visit for monitoring wells that were located.

Table 1: Groundwater Monitoring Wells Located During 20 March 2009 Site Visit

Monitoring Well ID Material Condition Stick up/gattic

cover Size (mm)

Standing Water

Level (m bgs)

Total Depth (m

bgs)

GM1/D1 (deep)

PVC pipe with cap

Sound Stick up, no steel monument

80 - 8.9*

GM1/D2 (deep)

PVC pipe with cap


80 2.11 16.58




*information obtained from historical borelog provided by Eraring

Bore logs for GM1/D1, GM1/D2, D40, D41 and D42 were provided by Eraring and presented information regarding the strata drilled. The monitoring well logs are provided in Appendix A. A review of the bore logs indicated that the geological sequence encountered comprised local ashy fill (from Wangi Power Station), overlying alluvial materials and reworked alluvial materials (clayey silty sand / sandy clay), overlying weathered conglomerate and mudstone bedrock (in deeper boreholes). Details are included in the Conceptual Site Model Figure F4.

AECOM noted that the screened interval information was not available for the previously installed groundwater monitoring wells in the CCP Facility catchment (including the wells which are currently used as part of the monitoring regime). As a result, while there is a long history of monitoring, the groundwater quality results cannot be related to a specific strata or section of an aquifer and may reflect mixed groundwater as encountered through the ash, alluvial and weathered bedrock.

3.4.2 Survey of Existing Monitoring Wells In accordance with the Project Approval requirements, on 29 April 2009 AECOM conducted a survey of the monitoring wells currently included in the monitoring program. In addition, survey details for six of the groundwater monitoring wells in the existing network (GM1/D1 – GM1/D3 and GM2/D40 – GM2/D42) were provided on the bore logs made available by Eraring.

Monitoring well D29, which is part of the existing monitoring regime, could not be located by AECOM during either the Site visit on the 20 March 2009 or during surveying on 29 April 2009, therefore, the

Monitoring Well ID Material Condition Stick up/gattic

cover Size (mm)

Standing Water

Level (m bgs)

Total Depth (m

bgs)

GM1/D3 PVC pipe with cap


50 2.1 4.0

D10 PVC pipe with cap


50 1.73 2.5



50 1.75 3.0



50 2.0 2.3


Sound (original well destroyed, new well installed adjacent)

Stick up, steel monument present but rusted and not locked

50 1.7 2.4



50 Detail not known

D42 (deep)

PVC pipe, no cap

Well bent, no cover

No cover present 50 1.9 8.0

MW01 (deep)

PVC pipe with cap

Sound Stick up, steel monument present

50 8.7 11.9




survey details have been requested from Aurecon. MW01 was not included in the survey at the time as AECOM was told that the survey data could be provided for that well.

All available survey details for existing monitoring wells are presented in Table 2 below.

Table 2: Available Survey Details for Monitoring Wells

MGA Coordinates ANG Coordinates ISG Coordinates Monitoring Well ID

Eastings Northings Eastings Northings Eastings Northings

Collar Relative Level (m

AHD*)

Currently monitored

GM1/D1 364240.59 6341240.74 416776 835569 - - 4.1 / 4.395**

GM1/D2 364744.94 6341298.94 417279 835615 - - 6.3 / 6.38**

D26 364613.59 6340974.42 2.59

Previously monitored

GM1/D3 - - 415430 836953 - - 33.9

GM2/D40 - - - - 147047 835289 101.9

GM2/D41 - - - - 146939 835322 101.0

GM2/D42 - - - - 147146 835284 102.0 * Above Australian Height Datum **Original Survey data / 29 April 2009 survey data ***Survey information for recently installed MW01 still to be obtained

3.4.3 Sampling Methodologies for the Existing Groundwater Monitoring Regime Information regarding the methodologies used in the existing groundwater monitoring regime was provided by Aurecon.

Since 2000, four monitoring wells (GM1/D1, GM1/D2, D26, D29) located down-gradient of the CCP Facility catchment area have been sampled as part of the groundwater monitoring regime for the CCP Facility (see Figure F5). Up-gradient monitoring well MW01 has also been included in the groundwater monitoring regime since March 2009. This monitoring program has been undertaken by Eraring as aproactive, due diligence approach.

The sampling techniques used by Aurecon were reported to be as follows:

• Prior to sampling, the depth to water is measured and monitoring wells are purged using bailers;

• After allowing for the monitoring well to re-charge, the water level is re-measured;

• Prior to sampling, polyethylene sample bottles are conditioned with water which is to be taken for analysis;

• Samples are collected using bailers and field filtered where required;

• The samples are stored in an esky at 0-4°C for transportation to the laboratory;




• pH, temperature and conductivity measurements are taken in the field;

• Results are tabulated and reported to Eraring after each monitoring event; and

• The results are compared against historical results to assess changes in concentrations (if any) over time.

3.4.4 Existing Analytical Schedule Quarterly monitoring of these monitoring wells is carried out for anions (sulphate, chloride, fluoride), cations (calcium, magnesium, sodium, potassium, iron), boron, manganese, alkalinity and pH. Annual monitoring of these monitoring wells also includes heavy metals (arsenic, cadmium, chromium, copper, selenium, lead and zinc).

3.4.5 Adequacy of the Existing Groundwater Monitoring Network In accordance with the Project Approval, a review was undertaken by AECOM in order to assess whether the current contaminant concentrations at receiving waters originate from existing activities at EPS, including the CCP Storage Facility. It is noted that for this review the ultimate receiving waters were considered to be Myuna Bay (Lake Macquarie) as shown in Figures F1 and F2.

As part of this review, the need for additional monitoring wells was also assessed. Based on the information gained during the 16 March 2006 and 20 March 2009 site visits undertaken by AECOM, and from the sampling information provided by Aurecon, the adequacy of the existing groundwater monitoring network has been assessed as follows:

• The locations of monitoring wells, GM1/D1, GM1/D2, D26 and D29 are considered to be adequate for monitoring groundwater conditions at the toe of the CCP Facility and provide a reasonable coverage;

While there is an extensive monitoring record from monitoring wells GM1/D1, GM1/D2, D26 and D29, the position of the screened interval in the wells was unable to be confirmed therefore it is not clear whether the monitoring wells are screened in aquifer groundwater (shallow or deep) or perched water;

• No monitoring wells located between the CCP Facility and Crooked Creek (which is considered to be a potential receptor) are currently included in the monitoring program;

• In the existing groundwater monitoring network, there were insufficient monitoring wells between the CCP Facility and the receiving waters of Myuna Bay;

• D42 has been damaged, D27 and D40 have been lost, and other wells have been poorly maintained (lack of top cap, and/or no security monument or lockable cap in public areas, overgrown vegetation). As a result, the analytical results from groundwater sampling cannot be assured as being representative of formation water; and

• D26 has been dry during eight out of 17 monitoring events since March 2005, therefore limited monitoring data is available.

The currently monitored well network in the CCP Facility catchment is considered adequate to spatially characterise the shallow groundwater quality changes observed at monitoring well locations, GM1/D1, GM1/D2, D26 and D29. However, the absence of known specific screened sections in the deeper wells does not enable the results to be specifically related to the deeper aquifer.

As a result of the above review, and in agreement with EPS, four additional screened monitoring wells were installed in March 2009 by AECOM, down-gradient of the CCP Facility, to infill data gaps identified regarding deeper groundwater quality.




The information gained from the existing groundwater monitoring regime from wells down-gradient of the CCP Facility is considered to be sufficient. However, as monitoring well screen construction details were not available for the monitored wells, it is unclear if the results are representative of conditions in the natural groundwater aquifer or in perched water within anthropogenic ash deposits (from former Wangi Power Station), or both strata.

3.5 Historical Groundwater Monitoring Results 3.5.1 Overview The results of historical quarterly groundwater monitoring at the Site were provided by Eraring in table format. It is understood that this data was provided to Eraring by Aurecon.

The summary below does not include monitoring wells D3 and D27 as they have been excluded from the groundwater monitoring regime since 2000 due to being dry or damaged/lost, and therefore no data beyond 1999 is available for these monitoring wells.

3.5.2 Summation of Historical Groundwater Results The current groundwater monitoring well network is considered to provide limited information on groundwater quality at the toe of the CCP Facility as well as down-gradient of the dam. As stated above, since the completion details of the groundwater monitoring wells is unknown, it is difficult to assess the aquifer, or strata, being monitored. It is understood that shallow groundwater monitoring wells have been installed at the Site, and that potentially some of the monitoring wells are monitoring groundwater quality within ash deposits of the former Wangi Power Station ash dam.

Limited data is available for the former upgradient well (D3), therefore it has been difficult to assess whether the background metal concentrations are naturally elevated in the area. However, based on local geology (iron stained conglomerate, shale and sandstone) and the limited results from the recently installed up-gradient borehole (MW01), it is expected that metals such as iron, manganese and arsenic may be naturally elevated.

Considering the above, historical groundwater monitoring results from March 1997 to March 2009 for boreholes GM1/D1, GM1/D2, D26 and D29 are summarised, with trends based on mean concentrations, as follows:

• Iron concentrations have remained consistent within most boreholes and overall concentrations have mean results ranging from 1.28 mg/L (D26) to 76.17 mg/L (D29).

• Selenium concentrations have remained consistent within most boreholes and overall concentrations have mean results ranging from 0.0029 mg/L (GM1/D1) to 0.0124 mg/L (GM1/D2). An anomalous peak of 0.083 mg/L (GM1/D2) occurred in March 2007.

• Chromium concentrations have remained consistent within most boreholes for the majority of the monitoring period and have been decreasing since 2007. Mean results for the boreholes range from 0.003 mg/L (GM1/D1 and GM1/D2) to 0.0108 mg/L (D26). An anomalous peak of 0.038 mg/L (D26) occurred in June 2000.

• Lead concentrations have remained consistently low within all boreholes and overall concentrations have mean results ranging from 0.0078 mg/L (GM1/D1) to 0.041 mg/L (D26).

• Copper concentrations have remained generally consistent within most boreholes and overall concentrations have mean results ranging from 0.007 mg/L (GM1/D1) to 0.516 mg/L (D2). Concentrations in GM1/D2 increased over time to a peak of 1.45 mg/L (GM1/D2) in March 2005 and have decreased over time since then.




• Arsenic concentrations have remained consistent within most boreholes and overall concentrations have mean results ranging from 0.0088 mg/L (D29) to 0.0347 mg/L (GM1/D2). An anomalous increase of concentrations occurred in GM1/D2 during the period 2004 to 2006, with a reported peak of 0.131 mg/L. Although concentrations have subsequently decreased, they are still noted to be outside the mean concentration range.

• Zinc concentrations have remained consistent within most boreholes and overall concentrations have mean results ranging from 0.038 mg/L (D29) to 0.638 mg/L (GM1/D2). It is noted that concentrations in GM1/D2 were generally outside the mean concentration range.

• Manganese concentrations have been somewhat varied in GM1/D1 and GM1/D2, but remained consistent for D29. Overall concentrations have mean results ranging from 0.187 mg/L (D26) to 3.346 mg/L (GM1/D1). It is noted that many of the concentrations reported in GM1/D1 and GM1/D2 were generally outside the mean concentration range.

• Fluoride concentrations were erratic in GM1/D2, but remained consistent for D26, D29 and GM1/D1. Overall concentrations have mean results ranging from 0.10 mg/L (D26) to 2.407 mg/L (GM1/D1).

• Cadmium concentrations have been consistent for all boreholes since March 2003. The results for all wells (GM/D1, GM/D2, D26, D29) for the period from 1998 to 2002 were consistently reported as 0.005 mg/L, indicating a potential error or perhaps a higher laboratory detection limit during that period of time. Overall concentrations have mean results ranging from 0.0024 mg/L (GM1/D1) to 0.003 mg/L (D29).

• Boron concentrations have been consistent within most boreholes. Overall concentrations have mean results ranging from 0.057 mg/L (D26) to 8.772 mg/L (GM1/D1). An anomalous increase of concentrations occurred in GM1/D2 during the period 2004 to 2006, with a reported peak of 2.2 mg/L. The concentrations were noted to be within the mean concentration range and have subsequently decreased.

• The results obtained from one round of monitoring the up-gradient background well MW01 indicated elevated iron (128 mg/L), manganese (6.76 mg/L) and arsenic (0.529 mg/L), which are all greater than the mean ranges for those metals, indicating that these analytes may be naturally elevated due to the geology / geochemistry of the area.

It is noted that the concentrations reported for the abovementioned contaminants of concern since 1997 have generally remained consistent. Minor anomalous results were reported, however these were not considered to pose a significant risk to the environment as they appeared to be localised, with concentrations generally decreasing following the anomaly.

3.6 Updated Groundwater Monitoring Regime 3.6.1 Installation of Additional Groundwater Monitoring Wells On 21 April 2009, AECOM installed four additional groundwater monitoring wells (MW02, MW03, MW05 and MW06) to expand the deeper groundwater monitoring network for the CCP Facility catchment area. MW04 was not installed as coverage of the area was considered to be adequate following installation of the four above-mentioned wells. The locations of the recently installed monitoring wells are shown on Figure F6.

The monitoring wells were installed to depths of 8.0 m (MW06), 11.80 m (MW03) and 12.0 m (MW05 and MW06) below ground level, with the screened sections positioned in silty sand. The bore logs for these groundwater monitoring wells are provided in Appendix B.




On 29 April 2009, a survey of the four newly installed groundwater monitoring wells (MW02, MW03, MW05, MW06) was conducted using a registered surveyor to establish levels (in AHD) and GPS coordinates. The details of the survey are presented in Table 3 below.

Table 3: Survey Details for Newly Installed Groundwater Monitoring Wells

GPS Coordinates Height - Top of

PVC Pipe (m AHD*)

Ground Surface - next to well (m AHD*)

Groundwater Monitoring

Well Easting (MGA Ground)

Northing (MGA Ground)

MW02 364535.39 6341258.31 7.850 7.085

MW03 364230.79 6341197.34 4.200 3.605

MW05 364435.73 6341062.31 2.775 2.030

MW06 364563.75 6341151.35 3.570 2.895

* Metres Above Australian Height Datum

3.6.2 Groundwater Monitoring Parameters The NSW DEC (2007) guidelines make reference to the National Water Quality Management Strategy Guidelines for Groundwater Protection in Australia (Agriculture and Resource Management Council of Australia and New Zealand and Australian and New Zealand Environment and Conservation Council, 1995). These guidelines recommend contaminants to be monitored for electricity generation activities including fly ash ponds and landfills.

Existing Monitoring Program

• Annual groundwater monitoring has been historically, and is currently, carried out for heavy metals (arsenic, cadmium, chromium, copper, selenium, lead and zinc).

• Quarterly groundwater monitoring has been historically, and is currently, carried out for anions (sulphate, chloride, fluoride), cations (calcium, magnesium, sodium, potassium, iron), boron, manganese, alkalinity and pH.

• Lake water quality monitoring (minimum 10 times per year) from two locations within Myuna Bay (considered to be the ultimate receiving water body) is conducted for temperature, salinity, dissolved oxygen, water clarity and zooplankton.

Recommended Future Monitoring Program (GM/D1, GM/D2, D26, D29, MW01, MW02, MW03, MW05 and MW06)

• Increase annual groundwater monitoring for heavy metals (arsenic, cadmium, chromium, copper, selenium, lead and zinc), to biannual and include total petroleum hydrocarbons (TPH) and polycyclic aromatic hydrocarbons (PAHs), which are included in the CoPC list for electricity generation sites including fly-ash ponds provided in ARMCANZ & ANZECC (1995);

• Reduce quarterly monitoring of major anions (sulphate, chloride and fluoride) to biannual monitoring;

• Removal of iron from the quarterly monitoring list and continued quarterly monitoring for the following:




- Remaining existing CoPCs - cations (calcium, magnesium, sodium, potassium), boron, manganese, alkalinity and pH; and

- Additional recommended CoPCs - conductivity, temperature, total dissolved solids, nitrate, phosphorus and anion/cation balance.

Protocols for obtaining representative groundwater samples and accurate and reproducible analytical results are outlined in EPA Victoria Publication 669 (2000) Groundwater Sampling Guidelines. Sampling procedures as used by Aurecon for the existing monitoring program were considered to be adequate and are to be used for future monitoring program (see Section 3.4.3). The methodologies are also included as Appendix C.

Further to the 2009 monitoring results from the newly installed deeper screened monitoring wells (and if they show the same previous trends - see Section 3.5.2), consideration should be given to further refining the analytical suite by removal of CoPCs such chromium, cadmium and possibly manganese.

3.6.3 Assessment Criteria to be used in GMP Groundwater is considered to be a receptor for potential derived contamination, however as previously stated, Myuna Bay is considered to be the ultimate receiving water body.

Groundwater quality is protected in NSW by the Protection of the Environment Operations Act (1997) and the Water Management Act (2000).

Guidance for assessing the most appropriate criteria to apply to groundwater analytical results in NSW is provided by NSW DEC (2007). These guidelines require that in assessing groundwater contamination, all environmental values of the groundwater need to be identified and their relevance considered such that appropriate groundwater investigation levels (GILs) are selected to assess groundwater quality at a site. NSW DEC (2007) states that concentrations of potential contaminants of concern in groundwater at a site must be compared, in the first instance, against existing generic criteria, if available, which protect environmental values such aquatic ecosystems (provided in ANZECC 2000). NSW DEC (2007) further states that “where the existing generic GIL is below the naturally occurring background concentration of a particular contaminant, the background concentration becomes the default GIL”.

According to ANZECC (2000), these guidelines should apply to the quality both of surface water and of groundwater since the environmental values which they protect relate to above-ground uses (e.g. irrigation, drinking water, farm animal or fish production and maintenance of aquatic ecosystems). Hence groundwater should be managed in such a way that when it comes to the surface, whether from natural seepages or from bores, it will not cause the established water quality objectives for these waters to be exceeded, nor compromise their designated environmental values.

ANZECC (2000) provides ‘Trigger’ levels for chemicals within water, which represent the best current estimates of the concentrations of chemicals that should have no significant adverse effects on the aquatic ecosystem. ANZECC (2000) indicates that an exceedance of a trigger level does not necessarily imply that there is an inherent risk, rather that further assessment and monitoring may be required prior to implementing appropriate management actions. AECOM also notes that while low reliability Trigger Levels have been derived within ANZECC (2000), it is noted that their application is limited as the “low reliability guideline trigger values were derived, in the absence of a data set of sufficient quantity, using larger assessment factors to account for greater uncertainty”, and that “low reliability values should not be used as default guidelines”. ANZECC (2000) stipulates that the identification of the receiving environment or the likely beneficial use of the water is essential for selection of the most applicable criteria.

Review of the data provided indicated that elevated concentrations of some parameters (i.e. iron, manganese and arsenic) are likely to be naturally occurring due to the geology / geochemistry.




Background concentrations for CoPCs such as iron, manganese and arsenic are likely to be elevated as these metals are commonly associated with conglomerates, shales, mudstones and sandstones, which were encountered as part of the regional geology. Iron staining has also been observed in the underlying conglomerate and mudstone encountered in historical boreholes.

Based on the limited data from background well MW01, it is noted that the generic criteria presented in ANZECC (2000) are less than the concentrations reported in MW01 for the majority of the abovementioned analytes. As expected, the generic criteria presented in ANZECC (2000) were also less than the historical mean range of concentrations reported for the wells monitored. Therefore, based on the guidance provided in ANZECC (2000), AECOM recommends that future monitoring results be compared to background concentrations as well as the historical mean ranges listed below:

• Iron: historical mean range of 1.28 mg/L to 76.17 mg/L.

• Selenium: historical mean range of 0.0029 mg/L to 0.0124 mg/L.

• Chromium: historical mean range of 0.003 mg/L to 0.0108 mg/L.

• Lead: historical mean range of 0.0078 mg/L to 0.041 mg/L.

• Copper: historical mean range of 0.007 mg/L to 0.516 mg/L.

• Arsenic: historical mean range of 0.0088 mg/L to 0.0347 mg/L.

• Zinc: historical mean range of 0.038 mg/L to 0.638 mg/L.

• Manganese: historical mean range of 0.187 mg/L to 3.346 mg/L.

• Fluoride: historical mean range 0.10 mg/L to 2.407 mg/L.

• Cadmium: historical mean range 0.0024 mg/L to 0.003 mg/L.

• Boron: historical mean range of 0.057 mg/L to 8.772 mg/L.


Commercial in Confidence

Groundwater Management Plan - Coal Combustion Product Management Facility


4.0 Reporting and Review

The following procedures are presented as a response plan in the event that monitoring identified an adverse change in contaminant concentrations or concentration trends in groundwater that could potentially be attributed to the expanded CCP storage facility. Figure 1 and Figure 2 below illustrate the procedures that are to be followed for implementation of this GMP.

Figure 1: Groundwater Management Process

Groundwater Management Plan

Background studies and previous groundwater

monitoring and indentify shortcomings

Routine water quality monitoring

Compliance with Standards and GMP

Liaise with DECC –Mitigation/management action

required

Is the incident reportable to authorities?

Non-compliance with Standards and GMP

Routine reporting





Figure 2: Groundwater Monitoring Protocol

Pre-sampling activities Drilling

Compliance with Standards and GMP

Liaise with DECC – Mitigation/ management action required

Is the incident reportable to authorities?

Non-compliance with Standards and GMP

Routine reporting

Installation

Bore Development

Groundwater Sampling

Groundwater level measurements

Purging

Filtration

Field measurements Sample collection

Decontamination

Analysis





4.1 Provisions for Periodic Auditing and Reporting of Results to the Director General

In accordance with the Project Approval requirements, results of the monitoring program will be provided to the DoP Director General as part of the Periodic Auditing.

4.2 Management Plan Review

This GMP will be reviewed on a five-yearly basis. Consideration and review of the monitoring locations will be undertaken at this time to ensure all monitoring locations remain representative.

Additionally, the GMP may be reviewed:

• Following changes to consent or licence conditions;

• Following any significant incident at the Site;

• Following the finalisation of any independent environmental audit; or

• If there is a relevant change in technology which is pertinent to Eraring Power Station operations.

Reviews of the GMP should involve consultation with relevant interested parties such as Site staff, adjoining landholders, community groups and government agencies, as required.




5.0 Conclusions and Recommendations

AECOM was engaged by Eraring Energy Pty Limited to prepare a Groundwater Management Plan (GMP) for the catchment area of the Coal Combustion Product Management Facility (CCP Facility) located on the Eraring Power Station, 3 & 28 Rocky Point Road and 45 Point Piper Road, Eraring, NSW.

The GMP has been developed as part of the project approval process for the upgrade of the CCP Facility and will provide guidance for the ongoing management of groundwater that is potentially affected by the CCP Facility.

The scope of work conducted included review of the existing groundwater monitoring well network and regime and provision of recommendations for revision of the groundwater monitoring program. AECOM also installed four additional well to supplement the existing network.

Based on the cementious nature of the proposed dense phase emplacement, a low permeability layer is expected form across the surface of the existing lean phase emplacement, as well as across the surface of the proposed expansion area of the CCP Facility, thus minimising the future potential for seepage to groundwater. Therefore, the proposed implementation of dense phase placement is therefore anticipated to result in a reduction in groundwater seepage in comparison to current conditions.

The recently modified monitored well network (including the four newly installed monitoring wells) in the CCP Facility catchment is considered adequate to spatially characterise groundwater quality changes.

The recommendations for the future monitoring program for the CCP Facility catchment are as follows:

• Monitoring wells GM/D1, GM/D2, D26, D29, MW01, MW02, MW03, MW05 and MW06 should be included in the future monitoring undertaken.

• Heavy metals (arsenic, cadmium, chromium, copper, selenium, lead and zinc total petroleum hydrocarbons (TPH) and polycyclic aromatic hydrocarbons (PAHs) should be monitored biannually;

• Sulphate, chloride and fluoride) should be monitored biannually;

• Monitoring for iron is no longer considered necessary as the concentrations have generally remained consistent and are considered to be naturally occurring due to the underlying geology.

• Cations (calcium, magnesium, sodium, potassium), boron, manganese, alkalinity, pH, conductivity, temperature, total dissolved solids, nitrate, phosphorus and anion/cation balance should be monitored quarterly.

• Sampling procedures used for the existing monitoring program were considered to be adequate and are to be used for future monitoring program.

• Further to the 2009 monitoring results from the newly installed deeper screened monitoring wells (and if they show the same previous trends), consideration should be given to further refining the analytical suite by removal of CoPCs such chromium, cadmium and possibly manganese.

Based on the guidance provided in ANZECC (2000) and the results of historical monitoring, AECOM considers that future results should be compared to a combination of historical results and background concentrations in the first instance, as trend analysis of the historical data indicates little change in parameter concentrations over time and background monitoring and geochemistry of the area indicates that background concentrations for several parameters are likely to be naturally elevated.




6.0 References

Agriculture and Resource Management Council of Australia and New Zealand and Australian and New Zealand Environment and Conservation Council (2005), National Water Quality Management Strategy Guidelines for Groundwater Protection in Australia

Australia and New Zealand Environment and Conservation Council (2000), Guidelines for Fresh and Marine Water Quality

ENSR (2007), Eraring Surface Water Management Plan, Eraring Energy Lands, Eraring Power Station, NSW, 11 July 2008

ENSR (2008), Proposal for Groundwater Management Plan, 13 October 2008

HLA (2006), Groundwater Monitoring Review, Eraring Power Station, 10 May 2006

HLA ENSR (2007), Eraring Land Management Plan, Eraring Energy Lands, Eraring NSW, 7 September 2007

HLA ENSR (2007), Environmental Assessment, Upgrade and Expansion of the Coal Combustion Product Management Facility, Eraring Power Station, November 2007

HLA (2007), Ash Dam Groundwater Assessment – Stage 1 Progress Report, 12 June 2007

NSW Department of Environment and Conservation (2007), Guidelines for the Assessment and Management of Groundwater Contamination

Protection of the Environment Operations (POEO) Act, 1997

Water Act, 1912

Water Management Act, 2000




Figures

CCP Storage Facility

LAKE MACQUARIE

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Dora Creek

Balcolyn

Eraring Power Station

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Site Location

Eraring Energy

Groundwater Management Plan -

CCP System


Rocky Point Road, Eraring NSW

Figure

F10 2500m

AECOM does not warrant the accuracy or completeness of informationdisplayed in this map and any person using it does so at their own risk.

AECOM shall bear no responsibility or liability for any errors, faults,defects, or omissions in the information.

Project ID: N6052202

Created By: TO

Last Modified: 14/05/2009

LAKE MACQUARIELAKE ERARING

PROJECT SITE

Myuna BayEraring Power Station

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Site Layout

Eraring Energy

Groundwater Management Plan -

CCP System


Rocky Point Road, Eraring NSW

Figure

F20 750m

AECOM does not warrant the accuracy or completeness of informationdisplayed in this map and any person using it does so at their own risk.

AECOM shall bear no responsibility or liability for any errors, faults,defects, or omissions in the information.

Project ID: N6052202

Created By: TO

Last Modified: 06/05/2009

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