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Splityard Creek Dam EMERGENCY ACTION PLAN – SPLITYARD CREEK DAM ISSUE: 13 Date: February 2020 Prepared by CS Energy/GHD Limited 1 Controlled Copy No: Gated: No Manned: Yes 2 Type: Earth and rock-fill embankment Project: Splityard Creek Dam EAP File no.: F/19/1991 Rural no.: 683 Wivenhoe Somerset Road (Power Station) o Location: Lat. -27.371944 (27°22'19"S) o Lon. 152.640833 (152°38'27"E) DISCLAIMER: This report has been produced by CleanCo to provide information for client use only. The information contained in this report is limited by the scope and the purpose of the study and should not be regarded as completely exhaustive. This report contains confidential information or information which may be commercially sensitive. If you wish to disclose this report to a third party, rely on any part of this report, use or quote information from this report in studies external to the Corporation, permission must first be obtained from the Chief Executive, CleanCo. 1 SunWater template 2 Monday to Friday Splityard Creek Dam - 2019/20 - i13 Emergency activation quick reference – Dam hazards The Emergency Action Plan (EAP) for Splityard Creek Dam covers three emergency conditions evaluated within CleanCo’s Dam Safety Management Program. Use Table 1 to select the relevant section of the EAP that deals with the emergency condition. Note: The Incident Coordinator (IC) is responsible for activating the EAP unless otherwise directed by the Dam Safety Technical Decision Maker (DSTDM). Should the IC be unavailable, the Dam Duty Officer (DDO) is responsible. Table 1: Emergency activation quick reference – Dam hazards Dam hazards and Activation levels for dam hazards section numbers Alert Lean Forward Stand Up Stand Down Piping: embankment, • Increasing leakage through dam • Increasing leakage through an 1. Piping condition has been established • Risk assessment has determined that foundation or embankment, foundations or abutments embankment, the foundations or 2. Failure in progress or likely due to piping, and sufficient piping risk has reduced abutments abutments with cloudy water water in storage to create a dam failure hazard See section 5 • EAP activated Earthquake • Earthquake reported or felt in the area • Earthquake reported or felt in the area 1. Earthquake reported or felt in the area, and a possible • No change detected or no damage found failure path has been identified during the inspections, or See section 6 • Intensity less than 5 MM (using Modified • Intensity greater than or equal to 5 MM, or Mercalli Scale in Appendix H Figure 13 2. Failure in progress or likely due to earthquake, and • Intensity less than 5 MM and change • Risk assessment has determined that sufficient water in storage to create a dam failure detected during surveillance inspection failure risk has reduced to an acceptable hazard • EAP activated level • Repairs completed as necessary Terrorist threat / activity • Alert/brief received from QPS Security and Counter-Terrorism Command relevant to dam 1. Possible terrorist activity or suspicious behaviour noticed • No damage found during the inspections, or or high energy impact at the dam, threat received relevant to dam safety, and safety • EAP activated Risk assessment has determined that See section 7 failure risk has reduced 2. Large explosion heard/observed at the dam (e.g. bomb • Repairs completed as necessary explosion, aircraft hit), and damage observed on the dam 3. Failure in progress or likely due to impact or explosion, and sufficient water in storage to create a dam failure hazard Splityard Creek Dam - EAP v13 Page ii Splityard Creek Dam - 2019/20 - i13 Table of Contents Emergency activation quick reference – Dam hazards ........................................................ ii Document control .......................................................................................................... viii Document revision history ................................................................................................ ix Controlled document distribution list ................................................................................ x 1. References, abbreviations and definitions ................................................................. 1 1.1 References/associated documents ................................................................................... 1 1.2 Abbreviations and acronyms ............................................................................................ 3 1.3 Business terms and definitions ......................................................................................... 2 2. Introduction ............................................................................................................. 5 2.1 Context .............................................................................................................................. 5 2.2 Purpose ............................................................................................................................. 6 2.3 Scope ................................................................................................................................. 6 2.4 CleanCo provides training ................................................................................................. 6 2.5 Dam emergency organisation within CleanCo .................................................................. 7 2.6 Community information ................................................................................................... 7 2.7 Lessons Learnt ................................................................................................................... 8 2.8 Downstream notification lists ........................................................................................... 8 2.9 Comprehensive Risk Assessments .................................................................................... 8 3. Roles and responsibilities ......................................................................................... 9 4. Dam details ............................................................................................................ 13 4.1 General dam information ............................................................................................... 13 4.2 Population at risk ............................................................................................................ 14 4.3 Spillway adequacy and reservoir water releases ............................................................ 14 4.4 General arrangement ...................................................................................................... 14 4.5 Emergency inspections and monitoring ......................................................................... 15 5. Dam hazard – Piping: embankment, foundation or abutments ................................ 16 5.1 Overview ......................................................................................................................... 16 5.2 Emergency Actions .......................................................................................................... 16 6. Dam hazard – Earthquake ....................................................................................... 24 6.1 Overview ......................................................................................................................... 24 6.2 Emergency Actions .......................................................................................................... 24 7. Dam hazard – Terrorist threat/activity or high energy impact .................................. 32 7.1 Overview ......................................................................................................................... 32 Splityard Creek Dam - EAP v13 Page iv Splityard Creek Dam - 2019/20 - i13 7.2 Emergency Actions .......................................................................................................... 32 Notifications and communication lists ....................................................... 39 Flood impact downstream and inundation maps........................................ 54 Routine and emergency access routes ....................................................... 57 Machinery and equipment ......................................................................... 59 Technical information ................................................................................ 60 Summary of legal requirements ................................................................. 68 Notices from local government and district groups including responses ..... 69 Emergency action plan – Toolkit ................................................................ 72 Splityard Creek Dam - EAP v13 Page v Splityard Creek Dam - 2019/20 - i13 List of Tables Table 1: Emergency activation quick reference – Dam hazards Table 2: Splityard Creek Dam specifications Table 3: Piping: Embankment, foundation or abutments – DDO emergency action Table 4: Piping: Embankment, foundation or abutments – IC emergency action Table 5: Piping: Embankment, foundation or abutments – IC external communication plan Table 6: Piping: Embankment, foundation or abutments –DSTDM emergency action Table 7: Earthquake – DDO emergency action Table 8: Earthquake – IC emergency action Table 9: Earthquake – IC external communication plan Table 10: Earthquake –DSTDM emergency action Table 11: Terrorist threat/activity or high energy impact – DDO emergency action Table 12: Terrorist threat/activity or high energy impact – IC
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