Prepared by Sunwater Limited Emergency Action Plan—Kroombit Dam IMPORTANT NOTE: Kroombit Dam is an unmanned dam. Issue: 8.2 Date: September 2020 Project: Kroombit Dam EAP File no.: 08-000371/001 Rural no.: N/A – located on Valentine Plains Road o o Location: Lat. -24.415984 Lon. 150.771644 24o24’57.49”S 150o46’17.86”E DISCLAIMER: This report has been produced by SunWater 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, SunWater. Kroombit–2020/21–i8.2 Emergency activation quick reference The Emergency Action Plan (EAP) for Kroombit Dam covers six dam hazards evaluated within Sunwater’s Dam Safety Management Program. Use the following table to select the relevant section of the EAP that deals with the dam hazard. Note: The Incident Coordinator (IC) is responsible for the decision to activate the EAP. Should the IC be unavailable, the Local Event Coordinator (LEC) or Dam Duty Officer (DDO) is responsible for the decision. Table 1: Emergency activation quick reference Activation levels Dam Hazards and Alert Lean Forward Stand Up Stand Down section numbers • Locally managed (DDO) • Locally managed (DDO, IC and LEC) • Locally managed (DDO, IC and LEC) with advice from • Locally managed (DDO, IC and LEC) with Owner’s Rep/DSTDM advice from Owner’s Rep/DSTDM Activation triggers for dam hazards Flood operations • EL 265.70m and rising • Storage above FSL 265.80m • Storage above EL 267.08m (750m3/s) • Storage level EL 266.00m and falling, with no See section 5 further rain expected in the catchment Chemical spill/toxic • Reports of contamination or potential • Not applicable • Confirmation of or highly likely probability of a large • Risk assessment that risk has reduced conditions contamination in the catchment area of amount of chemical spill/toxic conditions found in the • Confirmation that significant contamination See section 6 the storage (excludes normal storage/catchment has not occurred operating and monitoring of BGA) • All clear WQ test result • Escalated BGA or toxic condition from the Sunwater Environmental group Piping: embankment, • Increasing leakage through an • Increasing leakage through an embankment, • Piping condition has been established • Risk assessment has determined that failure foundation, or embankment, the foundations, or the foundations, or abutments with cloudy water risk has reduced abutments abutments See section 7 Earthquake • Earthquake reported or felt in the area, • Earthquake reported or felt in the area, AND • Earthquake reported or felt in the area, AND • Risk assessment has determined that failure See section 8 AND • Intensity greater than or equal to 5MM, OR • A change detected from surveillance, OR risk has reduced • Intensity less than 5 Modified Mercalli • Intensity less than 5MM and change detected • A possible failure path has been identified (MM) during surveillance inspection Terrorist threat/activity • Not applicable • Not applicable • Possible terrorist activity noticed at the dam or threat • Risk assessment has determined that failure or high energy impact received risk has reduced See section 9 • Large explosion heard/observed at dam (e.g., bomb explosion, aircraft hit) • Failure in progress or likely due to impact or explosion • Sufficient water in storage to create a dam hazard Overturning/sliding of • Indications of movement of monoliths • Storage level at flood of record EL 268.36m , OR • Obvious displacement of one or more monoliths, OR • Risk assessment has determined that sliding or monoliths noted such as cracking, increased • Increase in movement, pressures, or seepage • Evidence of scouring at or near toe of dam, OR overturning risk has reduced See section 10 seepage, or opening of joints • Storage Level at stability factor of safety 1.3, EL 270.38m NEXT PAGE: EMERGENCY ACTIVATION QUICK REFERENCE – OTHER EMERGENCY SITUATIONS ALL ACTION MUST BE TAKEN WHEN IT IS SAFE TO DO SO 13 15 89 SunWater Customer e.g., taking photographs/video, dam inspections, instrument readings Kroombit_Dam_EAP_-_I8_2.docx ! ALL PHOTOS MUST BE DATE STAMPED Support 24-hour contact line Page i Kroombit–2020/21–i8.2 Emergency activation quick reference – Other Emergency Situations The EAP for Kroombit Dam covers one other emergency situation evaluated within Sunwater’s Dam Safety Management Program. Use the following table to select the relevant section of the EAP that deals with the other emergency situation. Note: The Incident Coordinator (IC) is responsible for the decision to activate the EAP. Should the IC be unavailable, the Local Event Coordinator (LEC) or Dam Duty Officer (DDO) is responsible for the decision. Table 1: Emergency activation quick reference (continued) Activation levels Other Emergency Communications Failure – Dam Site (DDO) Communications Failure – Local Area (LEC/ORR) Communications Failure – Brisbane (IC/DSTDM) Situations and section numbers • Site managed (DDO - becomes LEC) • Brisbane managed by Incident Coordinator (IC) • Locally managed by Local Event Coordinator (LEC) Activation triggers for other emergency situations Comms Failure • Unable to communicate to or from Dam site • Unable to communicate to or from Local Area • Unable to communicate to or from Sunwater Brisbane See section 11 ALL ACTION MUST BE TAKEN WHEN IT IS SAFE TO DO SO 13 15 89 SunWater Customer e.g., taking photographs/video, dam inspections, instrument readings Kroombit_Dam_EAP_-_I8_2.docx ! ALL PHOTOS MUST BE DATE STAMPED Support 24-hour contact line Page ii Kroombit–2020/21–i8.2 Table of contents Emergency activation quick reference .............................................................................................. i Emergency activation quick reference – Other Emergency Situations .............................................. 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 ............................................................................................................ 2 1.3 Business terms and definitions ......................................................................................................... 3 2. Introduction .......................................................................................................................... 7 2.1 Context ............................................................................................................................................. 7 2.2 Purpose ............................................................................................................................................. 8 2.3 Scope ................................................................................................................................................ 8 2.4 Sunwater provides training .............................................................................................................. 8 2.5 Principles used in developing this EAP ............................................................................................. 9 2.6 Community information ................................................................................................................. 11 2.7 Lessons learnt ................................................................................................................................. 11 2.8 Downstream notifications lists ....................................................................................................... 12 2.9 Comprehensive Risk Assessments .................................................................................................. 12 3. Dam details ......................................................................................................................... 13 3.1 General dam information ............................................................................................................... 13 3.2 Population at risk ............................................................................................................................ 14 3.3 Spillway adequacy .......................................................................................................................... 14 3.4 General arrangement ..................................................................................................................... 14 3.5 Emergency inspections and monitoring ......................................................................................... 15 4. EAP roles and responsibilities .............................................................................................