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16.0 Water management – Emergency discharge plans 276
16.0 Water management – Emergency discharge plans
# Department Condition Description Completion date Status
Pre-Dec 2012 Post-Dec 2012
Completion of upgraded emergency response plans to cover all 35 52d iv April 2014 regulated water and waste storage facilities 36 49h, 52d i IV 53B c Develop Emergency Discharge Management Plan July 2013
Commitments completed Evergreen Commitments Commitments work in progress Firm deliverables for that month
16.1 INTRODUCTION
QGC’s water management facilities handle substantial water volumes of varying quality. A ‘best practice’ approach requires plans and procedures for situations where equipment or facility failure could result in a spill or emergency discharge.
A specific response guide has been developed for unforeseen emergency discharges from critical elements in the water management system and related infrastructure. The focus is on risk scenarios using the likelihood or potential to cause significant impacts on MNES.
This document presents the QGC Upstream Gas Field - Unforeseen Emergency Discharge Plan (UEDP) for the QCLNG project. The plan has been prepared to fulfil Commitment 36 of the Stage 2 CSG WMMP for compliance with the requirements of EPBC approval 53B c (formerly conditions 49h (I) and (II)) and 53B e (i) (III) (formerly Condition 52d (I) (IV)) of federal approval EPBC 2008/4398 to develop a Stage 3 CSG WMMP.
16.1.1 PLAN FRAMEWORK AND CONTEXT
The UEDP has been designed as an overarching plan and Emergency Response Guideline (ERG) that links directly with existing QGC incident management and emergency response plans developed under QGC’s Environmental Management System (EMS) in accordance with the international standard AS/NZS ISO 14001.
The plan is a specific response guide developed for handling unforeseen emergency discharges from critical elements of QGC’s water management system and related infrastructure. The plan is focused on scenarios that are ranked in accordance with or potential to cause significant or long-term impacts or harm to a Matter of National Environmental Significance (MNES) and events or situations that results in an abnormal state and require an immediate response in order to contain, minimise and/or to prevent – serious environmental harm as defined in Queensland's Environmental Protection Act 1994. 277
The primary risk scenarios specifically identified in this Plan include: • Loss of containment or discharges from CSG water storages and aggregation ponds; • Loss of containment or discharges from brine storages and aggregation ponds; • Uncontaminated discharge of CSG water, brine or treatment chemicals from water treatment facilities; and • Serious rupture or damage to CSG water or brine trunklines.
This Plan complies with the relevant HSSE Management System standards and procedures as listed in the table of references (Section 16.1.2) and has been developed to complement all existing and future management plans and procedures for responding to environmental incidents including QGC’s site-based emergency management procedures, dam safety emergency response plans and individual pond operating plans for individual CSG regulated storages and water treatment plant (WTP) operations management plans.
Emergency preparedness and response at QGC is not described in one document. There are several layers of emergency management at QGC and a range of standards, plans, procedures and guides prepared for the various organisational and system levels. An overview of emergency management at QGC is provided in Figure 16-1.
This UEDP shall function as an Emergency Response Guide (ERG) for the purpose of QGC’s management structure and should be read and implemented in conjunction with the QGC Environmental Emergency Incident Response and Reporting Procedure (QCOPS-OPS-ENV-PCE-000012) and any relevant site-based emergency response procedure in place for a particular site or asset type.
16.1.2 REFERENCE DOCUMENTS
This list of reference documents to the UEDP presented here should be read in conjunction with this Stage 3 WMMP: • Emergency Management Standard: QCQGC-BX00-HSS-STD-000011 (QGC, 2012); • Incident Management Plan: QCQGC-BX00-HSS-PLN-000002 (QGC, 2012); • Procedure for Environmental Emergency Incident Management: QCOPS-OPS-ENV-PCE-000014 (QGC, 2012); • Environmental Emergency Incident Response and Reporting Procedure: QCOPS-OPS-ENV-PCE-000012 (QGC, 2012); and • Site Emergency Response Procedure – Kenya: QCOPS-BX55-HSS-PCE-000001-4 (QGC, 2013). 278
BG Internal Incident Reporting Crisis Safety Case Environment Control and Investigation Management BG Standards are BG-ST-HSSE-AI- BG-ST-HSSE- Framework BG-ST-HSSE- BGA-HSSE-GEN- documents developed by 001 ENV-001 (Standards) EFF-001 ST-0900 BG Group Governance Committee . Compliance with BG Standards is mandatory for all BG employees and contractors . This document outlines the minimum mandatory QGC Incident and requirements for ensuring Near Miss Reporting, QGC Emergency all incidents and near Investigation and Management Standard This document outlines the misses are reported, Analysis Standard QCQGC-BX00-HSS-STD- fundamental concepts and investigated, analysed and QCQGC-BX00-HSS-STD- 000011 principles for emergency corrective and preventive 000011 management activities action implemented to undertaken at QGC . It prevent reoccurrence . also outlines the QGC Emergency Management System structure . A Safety Case is a document that ensures that suitable and sufficient Safety Case – Upstream QGC Incident This document measures are in place to Operations Management Plan (IMP) outlines QGS’s Incident prevent a major accident or QCOPS-OPS-HSS-SAC- QCQGC-BX00-HSS-PLN- Management System . environmental event and 000001 000002 It describes the to reduce the effects identification, notification, of these events should escalation and activation they occur . arrangements of the QGC Indicent Management Team (IMT) . It takes precedence over all ERPs .
Emergency Response Procedure’s (ERPs) are a QGC Emergency site specific document that Response Procedure outlines the Emergency Environmental (site based) Emergency Incident Response for a specific Management Procedure area . QCOPS-OPS-ENV-PCE- 000014 Emergency Response Guide (ERG) The ERG is a specific Development against the response plan developed requirements of ISO 14001 for handling a particular (as part of QGC’s EMS) and type of emergency event to provide linkage between (i .e . gas explosion) . the BG Standards and They are contained as QGC’s emergency response appendices to the broader relating specifically to an Emergency Response environmental incident Procedure . management .
Environmental Emergency Incident Response and Reporting Procedure QCOPS-OPS-ENV-PCE- 000012
Documents the requirements for responding to and investigating and environmental incident . This document should be referred to in conjunction with ERG’s . It shall be used to compliment the EMS Procedure for Environmental Emergency Incident Management .
Figure 16-1 – QGC's environmental emergency management structure 279
16.1.3 EXCLUSIONS AND RELATIONSHIP WITH EXTERNAL PROJECTS
The UEDP has been developed to incorporate QGC’s QCLNG upstream gas field CSG water management activities. In accordance with the Department variation to project conditions dated 2 November 2012 EPBC 2008/4398 QCLNG Gasfield, this plan does not incorporate elements relevant to treated CSG water provided to SunWater under the Glebe Weir or Chinchilla Weir Pipeline Projects.
60A: The proponent must treat all coal seam gas water as required under this approval before the coal seam gas water associated with the approved action enters the following pipelines:
• The Kenya to Chinchilla Pipeline referred to the Department (EPC 2011/6000); and • The Woleebee Creek to Glebe Weir pipeline (EPBC 2011/6181).
Once the CSG water has been treated as required under this approval and has entered the pipelines specified above, conditions 43-60 will no longer apply to that water. QGC is actively engaged with SunWater through relevant water service agreements for the projects and to develop and implement resource management and monitoring plans and operating protocols to ensure compliance with project conditions and sustainable beneficial use.
While the Kenya to Chinchilla Weir and Woleebee Creek to Glebe Weir pipelines are not included in this plan, QGC has amended the Kenya Site Emergency Response Procedure (ERP) (QCOPS-BX55-HSS-PCE-000001-4) and QGC Incident Reporting Investigation Procedure (QCQGC-BX00-HSS-PCE-000017) to ensure notifications and response actions are in place to appropriately manage risks associated with augmentation of town water supplies for the Kenya to Chinchilla Pipeline Project, including relevant notification procedures.
16.2 ENVIRONMENTAL VALUES PROTECTION OBJECTIVES
QGC has identified the following objectives for protecting environmental values in relation to CSG water management: • The extraction and treatment of CSG water is not causing adverse impacts to the surrounding environment, including site specific environmental values; • Treated water for beneficial reuse is meeting specified water quality criteria tailored for the intended reuse application and to avoid any adverse environmental impacts; • Avoid the potential for accidental spills and leaks of brine ponds and saline waste; • Avoid surface water contamination of nearby waterways; • Protect the groundwater quality in the vicinity of the WTP and storage ponds by minimising the potential for seepage of untreated CSG water and brine product from storage ponds to groundwater; • Minimising the generation of concentrated brine waste from the WTPs; • Decommissioning and rehabilitation of brine ponds/basins is to be undertaken as required throughout the life of the project; and • Maximise treated water recovery from the WTPs for beneficial reuse. 280
16.3 WATER MANAGEMENT CRITERIA
QGC has developed a suite of management criteria intended to be utilised as a tool to assess the overall performance of the QGC's CSG Water Management Strategy and the continual development and implementation of the system.
The management criteria provided below incorporate specific environmental objectives against which each component or use within the proposed water management network is to be monitored and assessed for performance as they are progressively implemented into the network.
The criteria also constitute active tools for avoidance, management and mitigation for potential and actual environmental harm including unforeseen emergency discharges. Control measures have been proposed to manage the potential risks of unauthorised release or spills to an acceptable level. These measures incorporate standard actions and procedures including monitoring.
These management criteria are not set or enforced as compliance limits but act as performance tool to assist QGC with the continual improvement and efficiency of the water management strategy and system. The criteria have been developed in compliance with the requirements of Section 310D (5)(e) of the EP Act and in accordance with the associated environmental conditions contained within QGC’s relevant upstream gas field environmental authorities. 281
CSG Water Management Monitoring Management Criteria Management Objective Frequency Performance Indicator and Actions System
Production To monitor the Produced water Performance Indicators Wells1 quality of CSG water from a sample of • Produced water quality parameters that exceed produced from production wells a deviation of 20% above long-term average2 are wells to ensure is sampled and investigated environmental values analysed at least • Early warning detection (LOR) of restricted substances of end use beneficial annually that may cause environmental harm reuse are preserved • Early warning detection of elevated levels of parameters that may cause integrity issues to well and pipeline infrastructure4 Potential Actions Required • Additional monitoring undertaken inform investigation into change in chemical parameter concentrations • Control use of water or reduce water production from affected wells
Wellhead Zero leaks and spills Producing wells to Performance Indicators Separator from infrastructure. be visited at least • Surveillance Monitoring indicates vegetation health No visible damage to monthly to check surrounding facilities vegetation or soil on for signs of leaks or • Infrastructure integrity (leakage data) surrounding land vegetation damage Potential Actions Required • Investigate any signs of leaks or damage to vegetation to locate, isolate, contain and/or repair any leaks identified
Water • Minimise leaks Annual inspection Performance Indicators Gathering or spills from of ground above • Surveillance monitoring indicates vegetation health Line gathering line a sample of the surrounding facilities and pumping water gathering • Infrastructure integrity (leakage data) infrastructure lines for evidence • No visible of water leakage or Potential Actions Required damage to vegetation damage • Investigate any signs of leaks or damage to vegetation vegetation or soil to locate and isolate, contain and/or repair any leaks on surrounding Pipeline Integrity identified land Management • Inspections of additional sections of water gathering • No observable System (PIMS) system if warranted by findings from initial inspections reduction in groundwater quality
Water • Minimise Data recording and Performance Indicators Trunklines leaks or spills telemetry (Flow) • Surveillance monitoring indicates vegetation health from pipeline surrounding facilities and pumping Annually • Infrastructure integrity inspections infrastructure (surveillance) • Leakage rates inferred by flow metering trends and/or • No visible variance between inflow and outflow meters damage to Potential Actions Required vegetation or soil • Determine whether inferred leakage rates are consistent on surrounding with leaking trunkline land • Locate any leaks, then isolate, contain and/or repair those • No observable leaks reduction in groundwater quality
1 QGC currently samples all CSG production well. As the project expands, a selection of representative CSG production wells will be sampled in each operating field. 2 Across the standard suite of parameters tested under the existing QGC monitoring program. 3 Limit of reporting. 4 Indicated through existing water quality sampling program of Low Point Drains (LDP). 282
CSG Water Management Monitoring Management Criteria Management Objective Frequency Performance Indicator and Actions System
In-field • Zero leaks and Tanks Performance Indicators Tanks Storage spills Data recording and • High level alarm Tanks, Ponds • No storage telemetry (level and Regional Ponds Regional failures or flow) • Early warning water forecasting indicates inflows ponds overtopping may exceed 1/5 of the regional pond storage capacity (untreated • No untreated Ponds (storages sized for five days at peak flows) CSG water) CSG water Annual integrity • Percentage completion of specified maintenance and entering the inspections inspection routines receiving Potential Actions Required environment • Confirm real time data reports are consistent between • No observable flow metering systems reduction in • Increase pond monitoring frequency groundwater • Assess maintenance backlog and determine whether quality additional resources are required to rectify backlog • Take action to reduce levels by diverting flow, reducing residence time in regional storage ponds and/or increasing flows to WTP
Aggregation • No visible Data recording and Performance Indicators Dams damage to telemetry (Level) • Early warning water level reaches Maximum Operating (untreated vegetation or soil Level (MOL) CSG water) on surrounding Quarterly • Mandatory Reporting Level (MRL) land (quality and • Full Integrity of security and fauna exclusion fencing • No observable surveillance) around HDPE lined facilities reduction in • Pond wall, liner, and seepage collection system integrity groundwater controls confirmed through shallow groundwater quality monitoring underdrainage leakage detection • No mortality or • No pond overtopping as controlled by water transfer entrapment of balancing and routine MRL monitoring local fauna and • No emergency release under normal and design storm livestock conditions • No accumulation • EA Conditions, Notification Schedule I: of salts and other • Annual dam inspections by suitably qualified people contaminants • Early warning detection of restricted substances that in the sub-soil may cause environmental harm profile below the • Early warning detection of elevated levels of parameters collection system that may cause integrity issues to well and pipeline • No storage infrastructure failures or Potential Actions Required overtopping • Confirm monitoring data reports and increase monitoring frequency as required based on analysis of inflow forecasting; • System modification to divert/reduce inflows and investigate integrity/quality concerns • Manage storage pond capacity through balancing via transfer of water between CSG water dams • System modification to divert/accept increase flow to WTP and beneficial use • Manage inflow to the pond (including diversion or reduction of production) • Works to rectify any leakage or seepage detected from dams • Works to rectify fauna exclusion structures surrounding HDPE lined facilities
5 Infield storage tanks are designed for three hour residence time at peak flows 6 A telemetry project for ponds is currently being developed and has not yet been implemented project-wide. Where telemetry does not exist, interim transition monitoring programs for water levels will continue to operate. Pond level monitoring according to existing systems may vary in frequency depending on individual pond type/use and operating status. 283
CSG Water Management Monitoring Management Criteria Management Objective Frequency Performance Indicator and Actions System
Reverse • CSG water to Data recording and Performance Indicators Osmosis be treated to telemetry (flows • Water to be treated to specific water quality standards Plants acceptable and pressure and relevant to the end use standards for some water quality • Early warning departure from water quality approved end parameters) requirements through daily monitoring of key permeate uses characteristics (such as EC) • No visible Daily, weekly and • Surveillance monitoring and maintenance program damage to monthly water indicates infrastructure integrity vegetation or soil quality monitoring Potential Actions Required on surrounding depending on • Confirm monitoring data reports and increase land beneficial use monitoring frequency • Zero leaks and • System modification to reduce or divert inflows and spills outside Monthly investigate integrity/quality concerns, corrective actions bunded areas (surveillance) taken where required • No unauthorised • Isolate or change source water discharges • System modification to recirculate outflows back to to receiving storage ponds during remedial works and testing environments • Manage production (including reduction of production) • No chemical to be instigated, remedial works required containment • Implementation of Plant Operator environmental failures inspection program
Treated • Zero leaks and Data recording and Performance Indicators Water Pond spills telemetry (Level) • Early warning water level reaches Maximum Operating (and Pump • No storage Level (MOL) Stations) failures Daily and weekly • Full Integrity of security and fauna exclusion fencing • No observable (Quality) around HDPE lined facilities deterioration in • No pond overtopping as controlled by water transfer/ treated water Quarterly balancing and routine MRL monitoring quality (surveillance) • Early warning departure from water quality • No mortality or requirements through daily monitoring of key permeate entrapment of characteristics (such as EC) local fauna and Potential Actions Required livestock • Confirming monitoring data reports and increase monitoring frequency as required based on analysis of inflow forecasting; • System modification to reduce/divert inflows and investigate integrity/quality concerns, corrective actions taken where required • Manage storage pond capacity through increasing outflows to beneficial use where possible • Manage WTP production (including reduction of throughput) to be instigated, remedial works required • Recirculate water through water treatment plant if required or redirect water to a beneficial use for which the quality is acceptable or alternative use such as construction where available • Works to rectify fauna exclusion structures surrounding HDPE lined facilities 284
CSG Water Management Monitoring Management Criteria Management Objective Frequency Performance Indicator and Actions System
Brine • Zero leaks and Data recording and Performance Indicators Containment spills telemetry (Level) • Early warning water level reaches Maximum Operating Ponds • No storage Level (MOL) failures Quarterly • Mandatory Reporting Level (MRL) • No observable (Quality and • Full Integrity of security and fauna exclusion fencing reduction in surveillance) around facilities groundwater • Pond wall, liner, and seepage collection and quality recirculation system integrity controls confirmed • No accumulation through shallow groundwater monitoring/ of salts and other underdrainage leakage detection and surveillance contaminants monitoring in the sub-soil • No pond overtopping as controlled by water transfer/ profile below the balancing and routine MRL monitoring collection system • Annual dam inspections by suitably qualified people • No mortality or Potential Actions Required entrapment of • Confirm monitoring data reports and increase local fauna and monitoring frequency as required based on analysis of livestock inflow forecasting • Water quality fit • System modification to reduce/divert inflows and for purpose or investigate integrity/quality concerns, corrective actions for contractual taken where required agreement • Manage brine production (including reduction of WTP throughput) to be instigated, remedial works required • Works to rectify any leakage or seepage detected from dams • Works to rectify fauna exclusion structures surrounding HDPE or synthetic geomembrane lined facilities • Implementation of actions resulting from annual pond inspections
Table 16-1 – QGC's water management criteria – management network
Although not specifically required for the purpose of the UEDP and for the purpose of the plan, the management criteria outlined below for on tenement use of CSG water and preferred outlet uses has been included for information and to illustrate how QGC will manage and monitor these activities on a routine basis and some of the high-level control and actions in place to ensure sustainable operation. 285
Management CSG Water Performance Criteria CSG Water Use Management Performance Indicator and Actions Objective Monitoring System Frequency
Managed Waste • No increase in As required Performance Indicators utilisation of irrigation weed and pest (per event/use) • Visual surveillance monitoring CSG Water for species (pre and post-event) authorised Dust suppression • No • Water application rates, quality Petroleum accumulation monitoring and data logging in Activities Pond of salts accordance with the QGC Land construction and other Release Management Plan contaminants • EA Condition – Dust Suppression in the soil and Land Release Limits profile Potential Actions Required • No degradation • Restrict/control use of water and of soil profile initiate investigations and further and structure monitoring • No visible • Remediation action implemented damage to • Performance Improvement vegetation process to be initiated or soil on surrounding land
Direct Supply to Non-QGC • Provision of Real-time telemetry Performance Indicators Water Service Infrastructure 100% of agreed (flows/pressure and • Early warning departure from Provider supply some water quality water quality requirements • No reduction in parameters)3 through daily monitoring of key agreed supply permeate characteristics water quality Daily, weekly and (such as EC) monthly water Potential Actions Required quality monitoring • Confirm monitoring data depending on reports and increase monitoring beneficial use frequency • System modification to reduce/ Monthly divert inflows and investigate (surveillance) integrity/quality concerns, corrective actions taken where required • Manage production (including reduction of production) to be instigated, remedial works required • Recirculate water through water treatment plant if required or redirect water to a beneficial use for which the quality is acceptable
1 QGC’s environmental responsibility under the QGC QCLNG CWMP and Project EAs is limited to supplying the required treated associated water to the nominated Treated Water Pond (to agreed Quality and Quantity). 2 Metering estimation is based on system performance 3 Real-time telemetry is an automated data transfer process and does not occur instantaneously. 286
Management CSG Water Performance Criteria CSG Water Use Management Performance Indicator and Actions Objective Monitoring System Frequency
Aquifer Post • Zero leaks and Quarterly water Performance Indicators Repressurisation treatment facility spills outside quality monitoring • Surveillance monitoring indicates (Managed bunded areas of ponds vegetation health surrounding Aquifer • No storage Monthly facilities, and infrastructure Recharge) Pilot failures (surveillance) integrity (no leakage) (Prefeasibility Potential Actions Required Trials) • System modification to restrict/ divert inflows • Regular maintenance regime • Shut down if required at pump infrastructure or isolate trunklines to instigate maintenance
Recharge process • No degradation Real-time Telemetry Performance Indicators of background (flows/pressure and • Water quality monitoring to groundwater some water quality determine no deterioration of quality parameters) background water quality in the • No over- Aquifer Monitoring target aquifer pressurisation (quality) • Aquifer pressure monitoring to of the aquifer determine no over-pressurisation of injection well or surrounding monitoring wells. Potential Actions Required • System modification to restrict/ control injection flows and inflows • Shut down if required at pump infrastructure to Investigate quality/pressure concerns
4 Refer treated water ponds objectives and criteria 5 To be determined through the feasibility stage of the aquifer pressurisation project investigations
Table 16-2 – Water management criteria – water outlets and use
16.4 ENVIRONMENTAL CONSEQUENCE RATING ASSESSMENT AND MANAGEMENT RESPONSE
QGC has considered the environmental consequence rating profile of each of the process element and over- arching strategies for the management of CSG water, including the intended treatment proposed. The key environmental risks for each management option have been assessed and assigned a rating based on potential consequence with regard to environmental harm.
For the purpose of the UEDP all key infrastructure elements of the water management system have been captured in the Environmental Rating Table (Table 16-3). The assessment and rating does not take into account the likelihood or risk profile of such an incident occurring as the QGC Water Management Criteria (Section 16.3) have been specifically developed to allow for continuous evaluation and optimisation of the water management system and thus reduce the likelihood or potential for such events. Therefore the ratings assessment below is specifically derived to determine trigger and response actions for such unforeseen emergency events if these were to occur. 287
Consequence Consequences Level type
Negligible I Minor II Moderate III Major IV Critical V
Natural Negligible impact Impact on fauna, Short-term Long-term impact Destruction Environment on fauna/flora flora and/or impact on of regional of sensitive habitat, aquatic habitat but no sensitive significances environmental ecosystems or negative effects environmental on sensitive features. Severe water resources. on ecosystem. features. Triggers environmental impact on Incident reporting Requires regulatory features ecosystems. according to immediate investigation (e.g. wetlands). Regulatory routine protocols regulator Regulatory and high level notification intervention government and/or action intervention and/or action
Potential Consequence I II III IV V
Wells – Spills and leaks
Gathering lines and trunklines – Spills and Leaks
Treated water ponds – Wall failure or discharge
Water treatment facilities -- Spills and discharge of CSG water, brine or chemicals
Regulated CSG ponds – Wall failure or discharge
Regulated brine ponds – Wall failure or discharge
Table 16-3 – UEDP Environmental Consequence Rating Table
QGC has separated the risk scenarios for unforeseen emergency discharges into two key categories: primary and secondary risks. These categories have been selected based on the specific consequence rating relating to unforeseen discharges from those elements of the system and the potential for of significant environmental harm. The process of categorisation allows nomination of key areas that require specific UEDP actions above and beyond the existing standard incident and emergency response procedures covering all unauthorised releases as detailed in Section 16.5).
Secondary risk scenarios include accidental spills and leaks that are contained and do not result in an indirect or direct release to groundwater or surface waters with potential for significant or long-term impacts or harm.
Secondary risk scenarios are determined as those that have been categorised with a potential consequence rating of I, II or III and require response actions as per the standard procedures listed in Section 16.5 and include: • Restricted spills of treated CSG water, brine or water treatment chemicals from Water Treatment Facilities; and • Minor leaks or spills of treated CSG water or brine from pipelines or storage ponds.
Primary risk scenarios include unforeseen emergency discharges that would result in indirect or direct release to groundwater or surface waters with potential for significant or long-term impacts or harm. 288
Primary risk scenarios are determined as those categorised with a potential consequence rating of IV or V and require additional UEDP monitoring, response and reporting actions as listed in Section 18.6, including: • Loss of containment or discharges from CSG water storages and aggregation ponds; • Loss of containment or discharges from brine storages and aggregation ponds; • Uncontained discharge of CSG water, brine or treatment chemicals from water treatment facilities; and • Serious rupture or damage to CSG water and brine trunklines.
Prescribed management measures including monitoring described in Section 16.6 are in additional to the standard procures under existing Environmental Incident Plans listed in Section 16.5 are specific triggers enacted through implementation of this UEDP.
16.5 ENVIRONMENTAL INCIDENT RESPONSE AND REPORTING PROCEDURES
The following procedures shall give guidance and direction on how to handle specific types of incidents relating to all unauthorised releases and unforeseen discharges. These procedures are a summary of immediate response, control and monitoring actions. The full procedures are detailed in the QGC Environmental Emergency Incident Response and Reporting Procedure QCOPS-OPS-ENV-PCE-000012 including identification of the steps and responses to be undertaken upon discovery of an unauthorised release.
Emergency or Incident Environmental Impact Action Response Plan
Refer to Section 16.5.1 CSG waters CSG Water Release
Chemicals Refer to Section 16 .5 .2 (hydrocarbons, Fuel, Oil and Chemical Spills Unauthorised TEG/other) release (1) Brines and Refer to Section 16.5.3 concentrates Brines and Concentrates
Hydraulic Refer to Section 16.5.4 Hydraulic stimulation release Stimulation Fluid Releases
Spills to land or water Refer above Dam collapse, breach or overflow (2) Refer to Individual Pond Operating Procedures (IPOPs) Downstream flooding Refer to Section 16.6.1 Dam Collapse, Breach or Overflow
Figure 16-2 – Environmental emergency incidents – unauthorised releases action response procedures 289
16.5.1 CSG WATER RELEASE
Immediate response • The person(s) after initial discovery of the incident should immediately seek to stop the flow of water if safe and possible to do so; • Notification of supervisor of the incident providing relevant incident category assessment according to QGC Incident Report Matrix; • Incident category assessment according to QGC Incident Assessment Matrix; • Supervisor to advise Line Manager of incident in accordance with QGC Emergency Response Procedure protocols; • Supervisor to notify Field Environment Officer (FEO) and complete an incident report; • Supervisor to contact Land Access Consultant if incident occurred off QGC-owned land, and provide details of incident and actions to address the situation; and • Land Access Consultant to contact landowner and advise of incident.
Control and minimise • Attempt to stem the flow of the water by creating earthen bunds or using surrounding material available: Extra caution should be taken to minimise any impacts on nearby environmentally sensitive areas (ESA) or watercourses; • Determine estimated quantity of water released; and • Trace the flow of the spill to its maximum extent.
Assessment • Perform sampling of the water at origin of the spill recording the following parameters: • pH • Electrical Conductivity (EC) • Temperature (°C) • FEO shall visit site of incident if required to do so for assessment: • Confirm details of the spill (i.e. cause of the release, extent of spill, location, water quality parameters as reported); • Take photographic record of incident; • Identify significant features (waterways, vegetation types, built structures within the receiving environment); and • Confirm incident category in accordance with QGC Incident Assessment Matrix. • FEO to report details of incident to Manager Environment; • Supervisor to issue Incident Flash, in accordance with QGC Incident and Near Miss Reporting and Investigation Requirements; and • Supervisor of owning business unit reports incident in Synergi in accordance with QGC Incident Reporting, Investigation and Analysis Standard. 290
Notification • Manager Environment provides notification to the regulatory body (DEHP) consistent with conditions of site specific EA: • Initial advice to be provided within 24 hours of becoming aware of incident; and • Written Incident report required to be submitted to DEHP within 10 business days of the initial notification in accordance with site specific EA. • Immediate notification to SunWater and the Queensland Office of Water Supply Regulator is required where an unplanned release of contaminant to waters occurs within the area of the Chinchilla or Dawson River Drinking Water Supply Schemes which involves a material impact to the water quality provided under those schemes in a way that would have an adverse effect on public health; and • The Department notification is undertaken in accordance with Condition 106 of the gas field approval including reporting of non-compliance and remedial action within five business days.
Remediation and monitoring • FEO to assess need for ongoing environmental monitoring based on impact. Monitoring may include but is not limited to: • Soil and/or water sampling to be undertaken to assess changes from background. For soils monitoring this may include but not be limited to three replicate samples at depth intervals of 0 to 10 cm, 20 to 30 cm and 50 to 60 cm at both an analogue and the impact site as a minimum. For monitoring of waters this program must include upstream, downstream and impact site monitoring procedures. Advice should be sought from a suitably qualified person in the area of land contamination matters before sampling is undertaken; and • Regular visual inspections of the site, including but not limited to the establishment of fixed-point photographic monitoring points. • FEO to assess and provide advice on the need for remedial works that addresses issues of environmental impact. FEO shall provide such advice to the business unit who will be responsible for implementation. Such works may include but are not limited to: • Reinstatement of landform; • Removal of ponded water; • Re-vegetation of impacted areas; • Removal of contaminated soil with cartage and disposal to be undertaken by an appropriately licensed operator. Waste records to be forwarded to and retained by the FEO; and • Establishment of exclusion zones to allow natural site rehabilitation.
All sampling of soils and waters shall be undertaken in accordance with the DEHP Monitoring and Sampling Manual 2009, Environmental Protection (Water) Policy 2009 Version 2 (or any subsequent approved version).
*Sampling of soils and waters shall be undertaken in accordance with the DEHP Monitoring and Sampling Manual 2009 Environmental Protection (Water) Policy 2009 Version 2. 291
16.5.2 FUEL, OIL, CHEMICAL OR EFFLUENT SPILLS
Immediate response As per procedure in Section 16.5.1.
Control and minimise • Check if the necessary product information is available. Refer to the Safety Data Sheet (SDS); • Determine estimated quantity of contaminant; and • Trace the flow of the spill to its maximum extent.
*All SDS, the register of hazardous substances and risk assessments are available via Chem Alert accessible by the intranet at: http://qgcintranet/hsse/Pages/Chem%20Alert/Chem 20%Alert.aspx.*
Assessment As per procedure in Section 16.5.1.
DEHP notification As per procedure in Section 16.5.1.
Remediation and monitoring As per procedure in Section 16.5.1.
16.5.3 BRINES AND CONCENTRATES
Immediate response (as per procedure in Section 16.5.1).
16.6 UEDP SPECIFIC RESPONSE ACTIONS AND REPORTING PROCEDURES
The following procedures shall give guidance and direction on how to handle significant unauthorised releases and unforeseen discharges resulting in potential for significant or long-term environmental impact through direct or indirect release to surface or groundwater.
These procedures are to be implemented in addition to those identified in Section 16.5.
The response plan can be triggered by four events resulting in direct or indirect release to surface or groundwater: • Loss of containment or discharges from CSG water storages and aggregation ponds; • Loss of containment or discharges from brine storages and aggregation ponds; • Uncontained discharge of CSG water, brine or treatment chemicals from water treatment facilities; and • Serious rupture or damage to CSG water and brine trunklines. 292
16.6.1 REGULATED DAM COLLAPSE, BREACH OR OVERFLOW (CSG WATER OR BRINE)
The Mandatory Reporting Level (MRL) is the level at which it is mandatory that the holder of a DEHP authorised Environmental Authority must communicate to DEHP that there is a possibility of a spillway discharge from a regulated dam.
Once the MRL is reached, QGC must act to reduce the pond water level to below the MRL with the aim of reducing the risk of a pond spill occurring. Available action strategies are dependant on the individual pond type and its connectivity to the overall water management systems and thus have to be considered on a case-by-case basis. All regulated dams are constructed with engineered spillways to ensure that in the unlikely event of a spill occurring that the integrity of the pond structure is maintained.
Should it become necessary to discharge CSG water from a regulated storage, such an action would be done with notification to and engagement with the Queensland Regulator. In the event of such a release a specific receiving environment water quality monitoring program would be implemented involving the monitoring at a number of locations in receiving waters downstream of the release.
Figures 16-3, 16-4 and 16-5 provide regionalised surface water catchment plans for the three QCLNG Project development areas. The plans indicate all key QCLNG project related ponds (existing and proposed at the time of publication). The plans are to be used as a tool in the selection of potential upstream and downstream surface water monitoring locations. In addition the plans indicate proposed surface water monitoring locations specific to the three (3) QGC Water Treatment Plant Hubs, these locations are further described in Table 16-6 UEDP monitoring locations for water treatment plant hubs.
Table 16-4 provides a summary of typical mechanisms to avoid, minimise and manage risks of emergency discharge from regulated storages. This table should be read in conjunction with the water management criteria and controls identified in Section 16-3.
Avoid Minimise Manage if Releases Occur
Operate ponds below Maximum If a pond(s) reaches MOL immediately Mitigation and monitoring procedure Operating Level (MOL) review system water balance and implemented forecast and consider if action is required
Continuous monitoring of CSG water Where modelling or monitoring • Agency and landholder notifications systems (inflows, storage levels and indicated pond(s) may exceed MRL • Remediation, monitoring and outflows) including increased frequency initiate system management actions reporting if required (e.g. water transfer to other ponds, increase outflows to WTP, diversion or cease inflows to pond) to avoid or minimise potential for controlled spill event
Regular water balance forecasting Where routine inspections indicate risk Management controls during emergency to provide early warning of system of potential loss of hydraulic integrity event (refer Table 16-5) peaks or triggers for management and of a pond, immediately initiate system contingency planning management actions to avoid or minimise potential for uncontrolled spill event (e.g. actions as per above, or where required)
Table 16-4 – Mechanisms to avoid, minimise and manage risks – regulated storages 293
Assessment and monitoring • Determine estimated quantity of water released; • Trace the flow of the spill to its maximum extent; • Implement surface water quality sampling and monitoring; • Initial site and surface water sampling of the water at origin of the spill and downstream and at an upstream reference point should at a minimum record the following parameters: • pH; • Electrical Conductivity (EC); and • Temperature (°C); • Where initial surface water sampling downstream at the nearest property boundary indicates elevated levels of the above parameters in concentrations that have the potential to cause significant environmental harm then additional UEDP monitoring should be actioned as per below; • All of the major QCLNG project ponds (existing and proposed) are identified in Figures 16-3, 16-4 and 16-5, current at the date of publication of the plan: • Where these ponds fall inside regional water treatment plant hubs, potential surface water monitoring locations should be sourced from the Table 16-7 – Unforeseen Emergency Discharge Monitoring Locations – Water Treatment Plant Hubs. These specific monitoring locations are also identified on the corresponding catchment area Figures 16-4 and 16-5; • Where these ponds fall outside the identified regional water treatment plant hubs, then suitable upstream and downstream surface water monitoring locations should be determined by the on-site FEO or relevant environmental coordinator with guidance from the Figures 16-3, 16-4 and 16-5 indicating surface water catchments for the respective development regions. For the Southern Gas Fields region two (2) potential monitoring locations have been proposed for consideration as these are active QGC Receiving Environment Monitoring Plan (REMP) sites. For the Central Gas Fields and additional four (4) sites have been located north of the Condamine River along Columboola Creek; • Individual Pond Operating Plans identify sensitive receptors, surface and ground water users and downstream land users who would be impacted by these receptors in case of emergency discharge such as a dam break. The referenced list of downstream receptors and locations may be used as a guidance and to assist in tracing the flow of the spill to its maximum extent; • Where downstream groundwater allocations are identified in the IPOP, advice should be sought from the Environment Manager (based on geologist input) for these ponds; and • Conduct monitoring of nearby water monitoring bores if required where there is likelihood of significant or long-term groundwater impacts from infiltration. 294
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M o o n i e R i v e r GILB M o o n i e R i v e r Label UEDD Monitoring Locations ERT GULLY Easting Northing M o o n ii e R ii v e rr GILBERT GULLY C a t c h m e n t FINC A Condamine River at Banana Bridge crossing on the Warra-Kogan Road. Label 27U74E4D1D Mo7n0it2o7ri6n4g3 Locations Easting Northing C a t c h m e n t H CR EEK F STRE C a t c h m e n t B Condamine River at Healy’s Crossing,I NsCouth of Warra. A 28C04o1n1damTiCnH7eW0O R22iv1e3r2 at Banana Bridge crossing on the Warra-Kogan Road. 277441 7027643 C a t c h m e n t H CR RTH RD EEK STRE B Condamine River at Healy’s Crossing, south of Warra. 280411 TCH7W0O 22132 QCLNG Project UEDP Catchment – Southern Gas Fields RTH RD TOOM BILLA CREEK TO C OMBI Trunkline - Water Subcatchment Area RA LLA CR WL EEK C ERS T RE O UEDD Monitoring Locations EK O ^_ C M Trunkline - Water Subcatchment Area RA BI Proposed Trunkline - Water Major Watercourse W L LE L C RS A T RE R O UEDD Monitoring Locations EK D O ^_ M BI 0 2 4 6 8 10 ! Proposed Trunkline - Water Major Watercourse L Ponds Minor Watercourse L Threatened Ecological CommunitCies E A ECIL PL ONI RD R AIN S MO D K " Water Treatment Plant Principal Road ! Ponds Minor Watercourse E Box Gum Grassy Woodland Threatened Ecological CommunitCies E E ECIL NI R Kilometres PLAIN MOO D R S C M a c i n t y r e & W e i r R i v e r s M a c i n t y r e & W e i r R i v e r s R K Proposed UIC Secondary Road " Water Treatment Plant Principal Road E E Brigalow Box Gum Grassy Woodland D E CEC R WAUGH W IL PLAIN C a t c h m e n t RD S RD C a t c h m e n t C M a c i n t y r e & W e i r R i v e r s O M a c i n t y r e & W e i r R i v e r s R R Grassland QGC Owned Land PLAINS Brigalow Proposed UIC Secondary Road C CIL E E IE RD D C ON MO CEC WAUGH W IL PLAIN C a t c h m e n t RD S RD C a t c h m e n t O K QCLNG EIS Area R SEVT QGC Owned Land E LAINS WILKINS RD Grassland C P E CIL R R CE NIE D R OO C E M R E WeIVeping Myall Woodlands L A R K SEVT QCLNG EIS Area S T A R E WILKINS RD R K I E D T E E D R W E A K W R W E C R O E R C E R E R R A C R E IV C C Weeping Myall Woodlands A L A R S T W A R R K I E D T E D R W E A K W W E E C O E R R R C R A C C A W ± Unforeseen Emergency Discharge Plan - South 0 2 4 6 8 ± Kilometers Figure 16-3 – QCLNG Project UEDP Catchment –U Southernnfore sGasee Fieldsn EmergencySC ADLE:i1s:250c,00h0at a(A3r) ge Plan - South 0 2 4 6 8 Map Projection: GDA94 Kilometers DCDB, Watercourses, Fields, Springs Note: Every effort has been made to ensure this information is spatially accurate. The location of this information should not be relied on as the exact field location. DATA SOURCE: "Based on or contains data provided by the State of Queensland (Department of Natural Resources and Mines) 2013. In consideration of the State permitting use of this data you acknowledge and agree that the State gives no warranty in relation to the data (including accuracy, reliability, SCALE: at (A3) DATE: 8/07/2013 CREATED BY: CL CHECKED BY: LN MAP TYPE: v3 Other MAP NO: M_28494_03 REV NO: A 1:250,000 - DNRM; Roads - StreetPro completeness, currency or suitability) and accepts no liability (including without limitation, liability in negligence) for any loss, damage or costs (including consequential damage) relating to any use of the data. Data must not be used for direct marketing or be used in breach of the privacy laws." Map Projection: GDA94 DCDB, Watercourses, Fields, Springs Note: Every effort has been made to ensure this information is spatially accurate. The location of this information should not be relied on as the exact field location. DATA SOURCE: "Based on or contains data provided by the State of Queensland (Department of Natural Resources and Mines) 2013. In consideration of the State permitting use of this data you acknowledge and agree that the State gives no warranty in relation to the data (including accuracy, reliability, DATE: 8/07/2013 CREATED BY: CL CHECKED BY: LN MAP TYPE: v3 Other MAP NO: M_28494_03 REV NO: A - DNRM; Roads - StreetPro completeness, currency or suitability) and accepts no liability (including without limitation, liability in negligence) for any loss, damage or costs (including consequential damage) relating to any use of the data. Data must not be used for direct marketing or be used in breach of the privacy laws." 295
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G A AZZ U AR I DS E N C a t c h m e n t RD R M S C a t c h m e n t N MYR L RD I W C A A RD E B E Z A I H UEDD Monitoring Locations T T U T R I ARA I ^_ G SPI Z E K D L O ST G EK E W AN E R L ! RD L Ponds Major Watercourse R N A D QCLNG Project C UEDPD CatchmentI – Central Gas FieldsS SOUT STE Label UEDD Monitoring Locations F Easting H R Northing R INO G R D HRT BAKER U IX S RD S RD B D YN M R BA
HU RTELSR L D H D D M R A AT C Nine Mile Creek – upstream QGC Kenya site boLundary (tributary of Wieambilla Creek) 251743 7015878 E " O S D Water Treatment Plant Minor Watercourse N EG C DR Threatened EcoR logical CommRunities H H T H Trunkline - Water Subcatchment Area T S D A A A U SO R I R L L N R ED D Wieambilla Creek – upstream QGC Kenya site boundary 245393 7015923 A N L M I MYR LS RD O C A T A A E O B RD F W Z D G H UEDD Monitoring Locations T T R R R ES U I ARA MAL KO O Proposed UIC Principal Road I ^_ G E K Box Gum Grassy Woodland K A D L OG EK W AN N E Wieambilla Creek – downstream QL GC Kenya site boundary 243916 7018865 E R ! Ponds RDMajor Watercourse S
R A D R C D ST K R EIN
Label UEDD Monitoring Locations Easting Northing OH D UG RTS RD MB E YN U F Wieambilla Creek –downstream QGC Kenya site at the Kogan-CondLamine Road crossing. 239703 7022777 E H E H D MI Brigalow QGC Owned Land Secondary Road R LLE R AN R AT S RD
C Nine Mile Creek – upstream QGC Kenya site boundary (tributary of Wieambilla Creek) 251743 7015878 L 2 4 6 8 10 " Water TreOatment Plant Minor Watercourse C D N 0 EG Threatened Ecological Communities G Condamine River –upstream QGC Windibri site boundary R R H 235081 7028002 A A T S D A A B SO R L R L L ED D Wieambilla Creek – upstream QGC Kenya site boundary 245393 7015923 A N L I L O T A QCLNG EIS Area AN D F O Grassland W H Condamine River –downstream site – outside of managed irrigation reach at Glen OliveG Road crossing 220305 7026170 R U ES R R MAL N O Box Gum Grassy KWO oodland K Proposed UICA Principal Road O D E DONOGHUE RD D G E Wieambilla Creek – downstream QGC Kenya site boundary 243916 7018865 L N R S N Kilometres G R !
K I Sandy Creek – upstream QGC Windibri site boundary 234947 7023476 H U D
H T H E T SEVT O F Wieambilla Creek –downstream QGC Kenya site at the Kogan-Condamine Road crossing. 239703 7022777 R E C R E ARTE Celeste NS L U ANE MIL O Brigalow QGC Owned Land Secondary Road S O E R LE J RS Condamine River –downstream QGC Windibri site boundary 231740 AN 7029169 RD N G S L C U
G Condamine River –upstream QGC Windibri site boundary 235081 7028002 A L D L A B Y R Weeping Myall Woodlands L UNDULLA D CR H L EEK U QCLNG EIS Area AN R GrasslNand D T H Condamine River –downstream site – outside of managed irrigation reach at Glen Olive Road crossing 220305 7026170 R BI U UL SLEY N C L RD RE A O D E DONOGHUE RD D EK G KES L E R PER R D L N EY G G L I Sandy Creek – upstream QGC Windibri site boundary 234947 7023476 ! D D H D U D H I S L AH T H R R T SEVT O R O UNDULLA D R UNDULLA CARTE R Celeste BI NS L U ANE O S J Condamine River –downstream QGC Windibri sitO e boundary 231740 C7R0E2EK9169 E N CREEK G S UL D LY R Weeping Myall Woodlands UNDULLA D CR H EEK U R N DU BISL T CR LLA EY RD EEK E KES RD PER L EY G L D D D D I L S R AH ± R R UNDULLA O D UNDULLA BI CREEK CREEK Unforeseen Emergency Discharge Plan - Central 0 2 4 6 Kilometers
± SCALE: 1:200,000at (A3) Unforeseen Emergency Discharge Plan - Central 0 2 4 6 Map Projection: GDA94 Zone 56 DCDB, Watercourses, Fields, Springs Note: Every effort has been made to ensure this information is spatially accurate. The location of this information should not be relied on as the exact field location. DATA SOURCE: "Based on or contains data provided by the State of Queensland (Department of Natural Resources and Mines) 2013. In consideration of the State permitting use of this data you acknowledge and agree that the State gives no wKairloramntey tien rrselation to the data (including accuracy, reliability, DATE: 9/07/2013 CREATED BY: LN CHECKED BY: CL MAP TYPE: v3 Other MAP NO: M_28494_02 REV NO: A - DNRM; Roads - StreetPro completeness, currency or suitability) and accepts no liability (including without limitation, liability in negligence) for any loss, damage or costs (including consequential damage) relating to any use of the data. Data must not be used for direct marketing or be used in breach of the privacy laws." SCALE: 1:200,000at (A3)
Figure 16-4 – QCLNG Project UEDP Catchment – Central Gas Fields Map Projection: GDA94 Zone 56 DCDB, Watercourses, Fields, Springs Note: Every effort has been made to ensure this information is spatially accurate. The location of this information should not be relied on as the exact field location. DATA SOURCE: "Based on or contains data provided by the State of Queensland (Department of Natural Resources and Mines) 2013. In consideration of the State permitting use of this data you acknowledge and agree that the State gives no warranty in relation to the data (including accuracy, reliability, DATE: 9/07/2013 CREATED BY: LN CHECKED BY: CL MAP TYPE: v3 Other MAP NO: M_28494_02 REV NO: A - DNRM; Roads - StreetPro completeness, currency or suitability) and accepts no liability (including without limitation, liability in negligence) for any loss, damage or costs (including consequential damage) relating to any use of the data. Data must not be used for direct marketing or be used in breach of the privacy laws." 296
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L S S T N KOWG O AT K U I A D W BO LA U MBA UR E MBI W F N I GANDIL DOW EYS U AN RD D I L B N R C R F DF S RD D D R B LOW C R ER W T C O RD EST RD H MU O A E R N S M D A D J W T ALYA R ARRAM D L R T D A R OO R R RD GL T EN U H AUBYN R O L ET E L RD R D E K D L O AT R E N L I D R N D L R O E I A R Trunkline - Water Subcatchment Area A D H L R L K W L C E C A S E L N I I
R N G HICKS W RD D UEDD Monitoring Locations E N C I N ^_ M N I N A LE A D N G ! C W R PondRs O Major Watercourse A O MT E G S H B MYRTL EK D E N OL RD AL IAM M C O K D L Y O D H R R A T R T SC MANTO IL EST D H LL PA N VASR QCLNGE ProjectMI UEDP S Catchment – Northern Gas Fields F W R OO RK W N E HA RD LR O R K A O T D SLOPS AIN R F LD F O SW T R D D E D O S N R O O L S S N KOWG O AT OD
B A K U U " R F OGANDILL EYS U RAN E Water Treatment Plant Minor Watercourse N R RD R F I B RD D R Threatened Ecological Communities C H D B N O S O WE D T MEBU O ST R C SH D A A MU R E D M D ND J D M ALYA R R Label UEDD Monitoring Locations Easting Northing R D D R R A R W A N GL EN R A I
H AUBYN DE K L D R V G ET O O L R R NC L
D A D A EAT O N O R UR R L R D T I L A L G R N R I
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O B D W L D R Proposed UIC Principal Road
R I L S A R Box Gum Grassy Woodland I Trunkline - Water Subcatchment Area Y
A D H Wandoan Creek – un-named tributLary downstream north-east of QD GC Delga Park site at Bakers E P
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R A E A B D A UEDD Monitoring Locations D O A D C M H D E Y N O ^_ N Road Crossing (adjacent QGC LaPilli property C 7I 73046 7093793 A S B R L A R M C E D N C C W D M G D A ! PondRs R Major Watercourse QGCA Owned Land Se condary Road O A A H O E Brigalow LW O S M B N KS MT MYR L T EE G O G G R ON TLE RD U R K AL AM A I C I N D L R A M K B R Wandoan Creek – downstream north of QGC Delga PD ark site at Sundown Road CrCoOsRsing (adjacent D O D LL R YA E BET I T ST D LL P TS N I E H A E BAC W R OO RK L K RD OLD OR KS T C M F W E D O W D 2 4 6 8 10 OD O ALL R R A " R 0 N S Water Treatment Plant Minor Watercourse A R QGC LaPilli property) T 771624 7096884 R CRE Grassland QCLNG EIS Area E Threatened Ecological Communities E E H D K O L N OCMEBU S E C S D W T H H A U RD K M Label UEDD Monitoring Locations Easting Northing H D R
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A DE D G D V G O O M Wandoan Creek – downstream site at BundNi Road Crossing 783916 L 7104970
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B W L D S A R Proposed UIC Principal Road
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W A M A SEVT E N E N E T L L
D I W N E E D D I A W N Junda Creek – downstreaN m of Woleebee Creek confluence at Booral Road Crossing 789104 7117403E A K K L U N N
KilometresE R J G C
D K V AN A AL A G R
B O A G C AC O A D H D K Y C I E O C E ESS Road Crossing (adjacent QGC LaPilli property 773046 7093793 C N A S B R R D O C M C E N L R C D M D D A R QGCA Owned Land Se condary Road TRAS S A H E R G Brigalow LW KS I D O A O Junda Creek – upstream of Dawson River Confluence at Leichardt Hwy Crossing 780337 7160753 M N KS L T ID O C LANE G G R ON U R G A I Weeping Myall Woodlands M C N D L A B R A R Wandoan Creek – downstream north of QGC Delga PD ark site at Sundown Road CrCoOsRsing (adjacent D O E E E BET T C TS BAC N I N L L K RD R R YAPU C YAL D M D NYA RDD M WALL Y R R R AN S QGC LaPilli property) T 771624 7096884 CRE Grassland QCLNG EIS AreBa A E PARK E EK O B a l o n n e R i v e r C L E B a l o n n e R i v e r W T H U K H T O D
C C D H M Wandoan Creek – downA stream site at Bundi Road Crossing 783916 7104970 D G H O
C R R
N R A S N K R E A O N E K SEVT E E N E E T C a t c h m e n t I E D W E N Junda Creek – downstreaN m of Woleebee Creek confluence at Booral Road Crossing 789104 7117403 A C a t c h m e n t K U N N E R C AL K AN G R G O C AC K C I E ESS C N A D E L R O C R R TRAS S D O Junda Creek – upstreamG of Dawson River ConfluencIe at Leichardt Hwy Crossing 780337 7160753 KS L I D D C ANE M G E Weeping Myall Woodlands A E N C L ± R YA D D R PUNYA R YAL Y D M R B PARK B a ll o n n e R ii v e rr Unforeseen Emergency Discharge Plan - North 0 2 4 6 8 10 C a tt c h m e n tt Kilometers ± SCALE: 1:300,000at (A3)
0 2 4 6 8 10 Map Projection: GDA94 Unforeseen EmergeDCnDB,c Wayter coDurseiss, Ficeldsh, Sparinrgsge Plan - North Note: Every effort has been made to ensure this information is spatially accurate. The location of this information should not be relied on as the exact field location. DATA SOURCE: "Based on or contains data provided by the State of Queensland (Department of Natural Resources and Mines) 2013. In consideration of the State permitting use of thisK dialotam yeotue arscknowledge and agree that the State gives no warranty in relation to the data (including accuracy, reliability, DATE: 8/07/2013 CREATED BY: LN CHECKED BY: CL MAP TYPE: v3 Other MAP NO: M_28494_01 REV NO: A - DNRM; Roads - StreetPro completeness, currency or suitability) and accepts no liability (including without limitation, liability in negligence) for any loss, damage or costs (including consequential damage) relating to any use of the data. Data must not be used for direct marketing or be used in breach of the privacy laws." SCALE: 1:300,000at (A3)
Map Projection: GDA94 DCDB, Watercourses, Fields, Springs Note: Every effort has been made to ensure this information is spatially accurate. The location of this information should not be relied on as the exact field location. DATA SOURCE: "Based on or contains data provided by the State of Queensland (Department of Natural Resources and Mines) 2013. In consideration of the State permitting use of this data you acknowledge and agree that the State gives no warranty in relation to the data (including accuracy, reliability, DATE: 8/07/2013 CREATED BY: LN CHECKED BY: CL MAP TYPE: v3 Other MAP NO: M_28494_01 REV NO: A - DNRM; Roads - StreetPro completeness, currency or suitability) and accepts no liability (including without limitation, liability in negligence) for any loss, damage or costs (in cFigureluding consequential da m16-5age) relating t o –any u sQCLNGe of the data. Data must no t Projectbe used for direct marketin gUEDP or be used in breach oCatchmentf the privacy laws." – Northern Gas Fields 297
Immediate response • All immediate response actions as per procedure in Section 16.5.1 ; • Review the relevant IPOP for relevant contact details for external notifications to people deemed to be potentially impacted including; • Sensitive Receptors – Landowners, or Persons At Risk (PAR); • Surface Water Allocations; • Groundwater Allocations; and • External Emergency Contacts
Control and minimise • Review the IPOP and implement the specific emergency management procedures. Standard emergency action considerations are identified in Table 16-5.
Item Emergency Action Considerations
• Potential human injuries and environmental harm should be managed through an On-Scene Coordinator. The On-Scene Coordinator will assist the General Manager in notifying the population at risk from the emergency 1 and, if required, assisting with evacuation of those people • The potential risk of, or further, human injuries should be managed by removing any nonessential staff from the area of the incident
• Risks associated with the incident should be managed by barricading off or delineating danger areas (if safe to do so) the affected area and restricting access • In assessing the extent of a potential uncontrolled release, no attempt should be made to traverse across or 2 immediately downstream of the affected area • In the case of an imminent release, the potential release area should be barricaded (if safe to do so). Temporary barricading options will be dependent on availability and mobilisation times (and could include temporary earth bunds or sand bags).
• Water delivery pumps should be switched off 3 • In the event of an imminent release, excess water should be pumped or decanted from the pond if practical and safe to do so
• Prevention of imminent or additional release should be managed in consultation with the Engineering Design Officer (EDO) responsible for the certification of the Pond. 4 • A QGC-approved earthmoving contractor should be mobilised to site promptly and, if required, the EDO responsible for the certification of the pond should also be mobilised to site to direct stabilisation works where practicable to do so.
• In the unlikely event that the uncontrolled release has not been contained, the Queensland State Emergency Services (SES) should be contacted. However this should not be taken as a transfer of responsibility from 5 the On-Scene Coordinator and support personnel. All pond specific emergency procedures should still be implemented.
• If there is an uncontained flow which may impact infrastructure, the relevant local council and appropriate 6 service providers should be contacted
• Remediation works should be undertaken in consultation with the QGC Site Construction Manager, or Field 7 Operation Manager or Asset Owner, Lead Pond Engineer and RPEDA
Table 16-5 – QCLNG pond emergency actions and considerations 298
Notification As per the procedure in Section 16.5.1.
Remediation and Monitoring As per the procedure in Section 16.5.1 and where required as per Section 16.6.4.
16.6.2 UNCONTAINED DISCHARGE OF CSG WATER, BRINE OR CHEMICALS FROM WATER TREATMENT FACILITIES
During operation and maintenance of QGC's Water Treatment Plans, significant or long-term environmental impact through uncontained discharges or spills are not expected nor considered likely. This is primarily due to the plant design, layout and operational controls in place. However, as the corresponding potential consequences of an uncontained discharge or spoll is categorised as a primary risk scenario, specific UEDP measures have been identified below for QGC's water treatment plant hubs.
Table 16-6 provides a summary of typical mechanisms to avoid, minimise and manage risks of uncontained emergency discharge from water treatment plant hubs. This table should be read in conjunction with the water management criteria and controls identified in Section 16.3 and Table 16-4 for the purposed of risk associated with regulated storages located adjacent the Water Treatment Plants.
Where initial surface water sampling downstream at the nearest property boundary indicates elevated levels in concentrations that have the potential to cause significant environmental harm then additional UEDP monitoring should be actioned. Potential surface water monitoring locations should be sourced from the Table 16.7 Unforeseen Emergency Discharge Monitoring Locations – Water Treatment Plant Hubs (also identified on the Figure 16.4 and 16.5) and monitoring of nearby water monitoring bores should be carried out where there is likelihood of significant or long-term groundwater impacts from infiltration.
Notification As per the procedure in Section 16.5.1.
Remediation and Monitoring As per the procedure in Section 18.5.1 and where required Section 13.6.4. 299
Design, monitoring and maintenance Control measures Manage if releases occur
• Treated water quality is to be • Maintenance of adequate capacity • Mitigation and monitoring regularly monitored to determine and redundancy in the water procedure implemented compliance with the adopted infrastructure to provide a buffer • Agency and landholder notifications criteria for authorised release and in case of WTP malfunction and/or • Remediation, monitoring and beneficial reuse emergency incident reporting • The WTPs are bunded where • Water quality controls will include • Management Controls for the plant practical to capture any CSG water some or all of the following as during emergency event include: or chemical spills including sludge, required: • System modification to reduce fuel, oil and chemical storage areas • Detention storage sufficient or divert inflows and investigate • Daily and weekly inspections to manage stormwater integrity/quality concerns, indicates infrastructure integrity quantity and a combination corrective actions taken where • Completion of routine of an sediment separator and required environmental checklists stormwater rock swales to • Isolate or change source water • Rapid close-out of incidents and manage stormwater quality • System modification to non-conformances • Stormwater quality recirculate outflows back to • All personnel to attend a site improvement devices (SQID) storage ponds during remedial induction which contains relevant including gross pollutant works and testing environmental requirements traps to reduces the impact of • Manage production (including • Additional and ongoing contaminated water entering reduction of in-flows) to be environmental training as required the first flush pond instigated during remedial • Constant supervision on site • A procedure specific to works • Environmental audits of work sites, emptying the first flush pond sub-contractors and compliance • Testing of water quality in issues chemical service pits prior to • Planned and unplanned removal maintenance regime indicates • Minimising disturbance and infrastructure integrity bare areas, and where this is • Regular environmental alerts and unavoidable, use of sediment toolboxes control devices. During the operation of the plant, the scheduling of heavy vehicle movements will (where possible) occur during daytime hours (7 am to 6 pm) including chemical deliveries
Table 16-6 – Mechanisms to avoid, minimise and manage the risks of emergency discharge from water treatment plants 300
Approximate Water Treatment Associated Storages Surface Water Monitoring Locations Coordinates Plant Hubs (DATUM: WGS84)
Kenya Central • Orana Pond 1 Nine Mile Creek – upstream QGC Kenya site 0251743 easting Water Treatment • Orana 2, 3 and 4 RO Reject boundary (tributary of Wieambilla Creek) 7015878 northing Plant (CWTP) and Brine Ponds Wieambilla Creek – upstream QGC Kenya site 0245393 easting • Rhynie Pond boundary 7015923 northing • Kenya Pond • WTP Sedimentation Pond Wieambilla Creek – downstream QGC Kenya site 0243916 easting • Kenya Treated Water Pond boundary 7018865 northing
Wieambilla Creek – downstream QGC Kenya site at 0239703 easting the Kogan-Condamine Road crossing. 7022777 northing
Condamine River – upstream QGC Windibri site 0235081 easting boundary 7028002 northing
Condamine River – downstream site – outside 0220305 easting of managed irrigation reach at Glen Olive Road 7026170 northing crossing
Windibri Water Berwyndale South Pond 4 Sandy Creek – upstream QGC Windibri site boundary 0234947 easting Treatment Plant 7023476 northing (WWTP) Condamine River – upstream QGC Windibri site 0235081 easting boundary 7028002 northing
Condamine River – downstream QGC Windibri site 0231740 easting boundary 7029169 northing
Condamine River – downstream site – outside 0220305 easting of managed irrigation reach at Glen Olive Road 7026170 northing crossing
Woleebee Creek Woleebee Creek Cells 1-3 Wandoan Creek – unnamed tributary downstream 773046 easting Northern WTP Northern NTP Pond north-east of QGC Delga Park site at Bakers Road 7093793 northing (NWTP) Crossing (adjacent QGC LaPilli property) NWTP Pond 2 Treated Water, Wandoan Creek – downstream north of QGC Delga 771624 easting NWTP Ponds 3, 4 and 5 Park site at Sundown Road Crossing (adjacent QGC 7096884 northing Sedimentation, RO Reject, Brine LaPilli property) and Clean In Place (CIP) waste Wandoan Creek – downstream site at Bundi Road 783916 easting Crossing 7104970 northing
Juandah Creek – downstream of Woleebee Creek 789104 easting confluence at Booral Road Crossing 7117403 northing
Juandah Creek* – upstream of Dawson River 780337 easting Confluence at Leichardt Hwy Crossing 7160753 northing
Notes: • The Water Treatment Plant Hub's proposed monitoring sites are to be used as a guide to UEDP sampling. These sites should only be used where safe access is possible and where relevant to the specific UED event. • Upstream reference sites for the Northern WTP hub should be located where possible on the QGC Delga Park site using upstream drainage locations where water is present or flowing during the event. • * Upstream Dawson River 8 Springs monitoring location for Dawson River 8 Springs. This site should only be triggered where event-related quality impacts are detected beyond other upstream monitoring locations identified.
Table 16-7 – Unforeseen emergency discharge monitoring locations – water treatment plant hubs 301
16.6.3 SERIOUS RUPTURE OR DAMAGE TO CSG WATER AND BRINE TRUNKLINES
QGC's regionalised water treatment plants and water management system are underpinned by a network of trunklines primary for the transport and untreated CSG water. In the future; in accordance with the development of QGC’s brine management strategy (see Chapter 15) this network of trunklines may require to be expanded to also include the transport of brine between treatment facilities to end use destinations. This section has been developed based on the design information and management strategies already employed for water trunklines and equally cover the potential for transport of brine and concentrates.
Review of any future design and development details of potential brine and CSG brine and concentrate trunklines will be made if require to amend and update relevant portions of the avoidance, mitigation and minimisation principles and actions procedures outlined below. Table 16.8 provides a summary of typical mechanisms to avoid, minimise and manage risks of serious rupture or damage to CSG water and brine trunklines. The table identifies that one of the key primary methods for avoidance of such events is though robust design and installation of the lines. This table should be read in conjunction with the water management criteria and controls identified in Section 16.3.
Design, Monitoring and Maintenance Control Measures Manage if Releases Occur
• Design elements of water trunklines • Surveillance monitoring of • Mitigation and monitoring include: vegetation health surrounding procedure implemented • Concrete lined carbon steel facilities and along the ROW • Agency and landholder notifications • Minimum 20 year design life • Routine Infrastructure integrity • System modification to divert from first LNG production inspections or isolate flows and investigate • Nominally sized to limit the • Online flow telemetry and control integrity/quality concerns, corrective maximum flow velocity to mechanisms to allow: actions taken where required between 2 to 3 m/s as an initial • Leakage rates to be inferred by • Remediation, monitoring and estimate flow metering trends and/or reporting • Flowmeters at each end to variance between inflow and detect leaks outflow meters • Pressure indication at the inlet • Control mechanisms to diver or • Back pressure control valve may isolate flows be installed at the end of the • Installation and maintenance of trunkline if elevation changes marker posts along the ROW may result in significant • Obtaining accurate as built data negative static pressure being to support internal GIS systems experienced and Dial Before YOU DIG (National • Surge protection to prevent Referral Service for Information on damage of the pipeline due to Underground Pipes and Cables) water hammer • Pipeline Integrity Management Unit • Combination air/vacuum vents (PIMS). installed at all high points for removal of gas and to prevent boiling of liquids due to vacuum formation • Pipelines are pressure tested to ensure there are no leaks prior to commissioning
Table 16-8 – Mechanisms to avoid, minimise and manage the risks of serious rupture or damage to CSG water and brine trunklines 302
Any failure, rupture or breach of a CSG water or brine trunkline or collection header has the potential to release contaminant that may cause environmental harm depending on the extent of the release and its location.
The potential volume of liquid released will be determined by: • The pipe diameter; • Volume of water contained in the pipe; • Distance of the particular piece of pipe to isolation valves; • Height of the failure point relative to the rest of the pipeline; • Flow rates; and • The time it takes to isolate the line.
Assessment and monitoring (as per the procedures in Section 16.5) • Section 16.5.1 for CSG water, or, Section 16.5.3 for brines and concentrates; • Where initial surface water sampling downstream at the nearest property boundary indicates elevated levels of the listed parameters in concentrations that have the potential to cause significant environmental harm then additional UEDP monitoring should be actioned; • All of the major QCLNG water trunklines (existing and proposed near term) are identified in Figures 16.3, 16.4 and 16.5, current at the date of publication of the plan: • Where any failure scenario is located in close proximity to a regional Water Treatment Plant Hub, potential surface water monitoring locations should be sourced from the Table 16.7 Unforeseen Emergency Discharge Monitoring Locations – Water Treatment Plant Hubs. These specific monitoring locations are also identified on the corresponding catchment area Figures 16.4 and 16.5); • Where any failure scenario is located outside the identified regional Water Treatment Plant Hubs, then suitable upstream and downstream surface water monitoring locations should be determined by the on-site FEO or relevant environmental coordinator with guidance from the Figures 16.3, 16.4 and 16.5 indicating surface water catchments for the respective development region; and • Conduct monitoring of nearby water monitoring bores if required where there is likelihood of significant or long term groundwater impacts from infiltration.
Notification As per the procedure in Section 16.5.1.
Remediation and Monitoring As per the procedure in Section 18.5.1 and where required as per Section 16.6.4.
16.7 UEDP REMEDIATION AND MONITORING
The type scale and extent of remediation works required to manage an unforeseen emergency discharge will be developed specific to the particular situation, event location including the extent of the environmental harm caused and with consultation and engagement with impacted stakeholders.
Where initial review of remedial works and assessment of monitoring as per Section 18.5.1 indicates ongoing risk of an adverse or significant effect on the receiving environment or stakeholders, QGC will develop a Site Specific Remediation Plan (SSRP).
The SSRP will be developed using input from the relevant engineering, environmental and technical disciplines and be structured to be consistent with the principles and objectives of the QGC Remediation, Rehabilitation, Recovery and Monitoring Plan (RRRMP) QCLNG-BX00-ENV-PLN-000026 as approved by The Department in accordance with gas field Conditions 15 to 17. 303
The SSRP will include but not be limited to: • An assessment of initial remedial works conducted • Potential and actual effects on the receiving environment and the need for further investigation and assessment; • An assessment of potential and actual effects on environmental values and MNES and/or surface and groundwater users; and • Details of proposed remedial and rehabilitation actions to be taken including: • areas to be rehabilitated; • land uses of each area to be rehabilitated prior to disturbance; • vegetation communities present, including a map of suitable scale displaying the distribution of vegetation communities including impacted areas; • proposed revegetation methods; • timeframes for rehabilitation; and • ongoing monitoring and reporting .
An initial SSRP (where required) will be developed within a further 10 business days post the provision of an incident report (see Section 16.5.1) where practicable. On completion of the remediation and rehabilitation activities identified in the SSRP a summary report will be prepared covering the following items: • A final assessment of the actual or potential environmental harm that has occurred or may occur in the longer term as a result of the release; • The success or otherwise of actions taken at the time of the incident to prevent or minimise environmental harm; • The successes of remediation and rehabilitation activities carried out under the plan; and • Any outstanding or ongoing issues and/or concerns.
The initial SSRPs and Summary Reports will be made available to The Department and the Queensland Regulator as part of the engagement phase and during the ongoing remediation and monitoring process.
16.8 EMERGENCY SCENARIO SIMULATION
16.8.1 INTRODUCTION
The basis of design and operating philosophy of the water management infrastructure is to manage produced water without the need to overflow or make an emergency discharge. To demonstrate the robustness of the system, an extreme emergency scenario has been simulated. This simulation takes the format of an artificial series of events affecting the Central and Northern WTP facilities. The scenario is set outside the normal operating parameters of the system.
16.8.2 SCENARIO ASSUMPTIONS
Figure 16-6 illustrates the key infrastructure elements in the system. The simulation assumes: • The scenario runs from the onset of major depressurisation in the Southern and Central Gas Fields in December 2013; • The key section begins in December 2014 when water treatment capacity is at a peak of up to 112 ML/d for Central and Southern and 100 ML/d for Northern; • Throughout 2013, the Central plant undergoes routine planned maintenance and upgrade shutdowns; • All inflows from the Central and Southern regional ponds report to the raw water ponds system, Orana 1 or Orana 5; 304
MCNULTY MCNULTY 200 ML AVON DOWNS
MINING SECTOR BELLEVUE REUSE GLEN EDEN 115 ML BERWYNDALE INDUSTRIAL REUSE BERWYN S / WINDIBRI
CHINCHILLA WEIR POND 4 4,370 ML
KENYA KENYA RWF TREATED WATER 2,001 ML 170 ML WINDIBRI WTP MATILDA – JOHN RHYNIE 6 ML/d 3,719 ML LAUREN
ORANA 2 ORANA 3 LAUREN ARGYLE 1,280 ML 1,040 ML 104 ML KENYA SUNWATER CODIE
RO REJECTRO KATE ORANA 1 5,158 ML KENYA EAST BRINE KENYA EAST CONCENTRATOR JAMMAT / OWEN 597 ML MARGARET KENYA WTP ORANA 5
CONCENTRATED BRINE CONCENTRATED 112 ML/d 2,130 ML FROM NORTHERN WTP FROM
DAVID DAVID 334 ML SEAN JORDAN WILL / RIDGEWOOD S ORANA 4 CELESTE MICHELLE 752 ML 310 ML WILL / RIDGEWOOD N CELESTE MYRTLE
MYRTLE TEVIOT 150 ML ABERDEEN MARIE RAE
JEN
ISABELLA RUBY-JO 760 ML RUBY-JO POPPY
BARNEY CLUNIE COUGALS
GLENDOWER Pump GLENDOWER 481 ML Existing ponds Under construction or to be built BROADWATER BROADWATER Development blocks 370 ML HARRY
Figure 16-6 – Central and Southern Gas Fields collection and storage networks 305
• From December 2014, additional inflows of 754 ML are added to the production profile, due to precipitation falling directly onto pond surfaces. The ponds do not have any upstream catchments so there are no overland flow inputs; and • A plant breakdown has caused a stop in the treatment process or the offtake pipeline is unable to discharge the treated water.
The objective of the analysis is to answer two key questions: • If the treatment plant is not operating how long can CSG water abstraction continue before the raw water ponds reach maximum operating level? • When the raw water ponds are full, how long can the regional ponds hold water below Maximum Operating Level (MOL) before CSG water abstraction has to be curtailed?
16.8.3 SIMULATION RESULTS
The results for Central and Southern are displayed in Figure 16-7.
13,000 160
12,000 140 11,000 Orana 5 10,000 120 Flood event 9,000 December 2014 8,000 100
7,000 80 6,000 Orana
5,000 60 4,000 40 (ML/d) Rate Withdrawal KWTP 3,000 50 days of WTPs shutdown 2,000 South flows (01/11/14-20/01/15) Rynie 20
Volume Storage Capacity (ML) / Volume in Storage (ML) in Storage Volume (ML) / Capacity Storage Volume 1,000
0 01/11/2015 01/11/2013 01/11/2014 01/12/2015 01/12/2013 01/01/2015 01/12/2014 01/10/2015 01/01/2014 01/10/2014 01/07/2015 01/01/2016 01/10/2016 01/05/2015 01/02/2015 01/03/2015 01/07/2014 01/05/2014 01/04/2015 01/02/2014 01/08/2015 01/07/2016 01/03/2014 01/06/2015 01/05/2016 01/02/2016 01/09/2015 01/04/2014 01/03/2016 01/08/2014 01/06/2014 01/04/2016 01/09/2014 01/08/2016 01/06/2016 01/09/2016
Updated 13 November 2013 WTPs and Pond 4 transfer Withdrawal rate (ML/d) Current storage (Rynie + Orana 1 + Orana 5): 4400 ML
Figure 16-7 – Emergency Event: Simulation results 306
• On the left side of the graph is the commencement of major depressurisation in January 2014; • Inflows gradually increase over the year to a maximum of 92 ML/d; • The yellow line displays the withdrawal rate (i.e. the volume of water treated in the plant) planned shutdowns for maintenance during the early part of 2013 are included; • The blue line displays the increasing combined raw water pond levels as water production ramps up; • In December 2014, an extreme event similar to the Queensland December 2010 event is added to the simulation – 754 ML for the Kenya WTP complex and 118 ML for the NWTP complex; • The total valume is derived from total December 2010 rainfall of 348.8 mm (from BoM as measured at Miles Post Office, station number 042023) and total area of the ponds (e.g. 2,191,000 2m for the Kenya complex); • The simulation reverts to mean rainfall from January 2015 which, at 95.4 mm, is higher than the January 2011 recorded total of 88.6 mm; • In addition 50 days of plant shutdown are added to the simulation; • The lack of treatment capacity results in a sharp increase in pond operating level, and • Despite water backing up in the raw water ponds, the Maximum Operating Level (MOL) is not exceeded.
Therefore, under such a scenario the production profile can be managed without discharge of untreated water while a plan for plant startup or wells shutdown can be implemented. Furthermore, if this analysis considered the regional storage ponds in the Southern Gas Fields, an additional 40 days storage is available. Therefore, the results can be considered as conservative and should represent a worst case condition over the life of the project.
Running the same scenario for the Northern Gas Fields, the duration for shut down for the Northern Gas Fields is limited to 26 days using the same operating assumptions as for the Central and Southern case. Although this is less time than for the Central and Southern Gas Fields, it still provides sufficient time to manage water production such that all raw water is contained within the ponds. Again, a plan for either start-up of water facilities or the shut-down of wells would be prepared to contain and treat all raw water. As a back-up, an additional 46 days of storage is available in the Polaris regional pond.
In case of water quality issues, water can be recirculated for further treatment and temporarily stored in existing ponds. If out-of-spec water is detected by the in-line monitor at the Treated Water Pond Outlet, inflow to the Treated Water Pond ceases and the treated water is re-circulated to the Raw Water Pond.
The plants are operated under a performance incentive whereby the operator must meet the Nomination that QGC has set for delivery of water to the respective beneficial use schemes. By managing production incentives the potential for extended shutdowns is minimised. Therefore, an extended shutdown of up to 50 days is not considered to be a likely scenario.
In terms of the key questions of the analysis: • The Kenya complex can store CSG water for up to 50 days without treatment. Those 50 days are more than adequate to address any plant failures. • The regional pond complex adds another 40 days to the storage capacity; • Under a similar scenario the NWTP has 26 days of storage available – also sufficient time to address plant failures. With an additional 46 days regional storage; and • To avoid reaching MOL the water production profile will be managed including inflows.
# Department Condition Description Completion date Status
Pre-Dec 2012 Post-Dec 2012
Completion of upgraded emergency response plans to cover all 35 52d iv April 2014 regulated water and waste storage facilities 36 49h, 52d i IV 53B c Develop Emergency Discharge Management Plan July 2013
Commitments completed Evergreen Commitments Commitments work in progress Firm deliverables for that month