Illawarra Coal Dendrobium DSC Notification Area Avon and Cordeaux Reservoirs DSC Notification Area Management Plan Dendrobium Mine Avon & Cordeaux Reservoirs DSC Notification Area Management Plans Review History Revision Description of Changes Date Monitoring Plan DENMP003 Revision 7 Final Plan for Area 1 01/06/05 Revision 8 Plan updated to include Area 2 30/03/07 Revision 9 Final Plan incorporating Area 2 20/10/07 Revision 10 Rewrite and updated to include Area 3A 27/11/09 Incorporate DSC and Water NSW comments 15/01/10 Incorporate additional DSC and Water NSW comments 10/03/10 Revised Mine Plan Area 3A and DSC Comments 06/04/10 Contingency Plan DENMP0049 Revision 1 Final revision for Area 1 20/07/05 Revision 2 Draft Revision to Accompany Area 2 Application 30/03/07 Revision 3 Final Revision to incorporate Area 2 20/10/07 Rewritten and updated to incorporate Area 3A 27/11/09 Incorporate DSC and Water NSW comments 14/01/10 Revision 4 Incorporate additional DSC and Water NSW comments 10/03/10 Revised Mine Plan Area 3A and DSC Comments 06/04/10 Revision 5 Revised to incorporate contingency for Dendrobium Dyke 22/02/11 Closure Plan DENMP0030 Revision 1 Final for Area 1 01/06/05 Revision 2 Draft incorporating Area 2 30/03/07 Revision 3 Final incorporating Area 2 20/10/07 Revision 4 Rewritten and updated to incorporate Area 3A 27/11/09 Incorporate DSC and Water NSW Comments 14/01/10 Incorporate additional DSC and Water NSW Comments 10/03/10 Revised Mine Plan Area 3A and DSC Comments 06/04/10 Management Plans DENMP0078 Revision 0 Monitoring, Contingency and Closure Plans were 26/9/11 Draft 2 updated after an annual review and then consolidated into one document Revision 0 Revised to incorporate results of Annual Review, revised 5/10/12 Draft 3 TARP, updated responsibilities, updated contacts and to include Area 3B Revision 0 Final Endorsed by DSC 12/12/12 Revision 1 Revised to incorporate results of Annual Review 22/05/14 Draft 1 Revision 1 Revised to incorporate DSC correspondence 15/07/14 25/11/14 Revision 2 Revised following review of Management Plan 17/08/15 Revision 3 Rewrite and Update following review 0910/15 This document is valid 24hrs from time printed Document ID: DENMP0078 Revision: 3 Page 2 of 72 Publication Date: 16/09/2015 Dendrobium Mine Avon & Cordeaux Reservoirs DSC Notification Area Management Plans CONTENTS 1 CONTACT LIST ...................................................................................................................................................... 5 2 INTRODUCTION .................................................................................................................................................... 6 3 PURPOSE .............................................................................................................................................................. 7 4 SCOPE ................................................................................................................................................................... 9 5 DEFINITIONS ......................................................................................................................................................... 9 6 HAZARD IDENTIFICATION ..................................................................................................................................11 7 MONITORING MANAGEMENT PLAN ..................................................................................................................15 7.1 SCOPE.....................................................................................................................................................................16 7.2 CONTROL PROCEDURES ............................................................................................................................................16 7.3 PRINCIPAL MONITORING CONTROLS ...........................................................................................................................17 7.3.1 Underground Water Sampling and Analysis .......................................................................................................... 17 7.3.2 Underground Water Balance ................................................................................................................................. 18 7.4 SECONDARY MONITORING CONTROLS ........................................................................................................................19 7.4.1 In – Seam Drilling ................................................................................................................................................... 19 7.4.2 Underground Geological Mapping ......................................................................................................................... 19 7.4.3 Surface Geological Mapping .................................................................................................................................. 19 7.4.4 Environmental Monitoring at the Mining Face ........................................................................................................ 20 7.4.5 Groundwater Monitoring ........................................................................................................................................ 20 7.4.6 Subsidence Monitoring .......................................................................................................................................... 21 7.4.7 Statistical Reports .................................................................................................................................................. 27 7.4.8 Compliance Reports .............................................................................................................................................. 27 7.4.9 Monitoring, Reporting and Extraction Schedule ..................................................................................................... 27 7.4.10 Liaison Officer ........................................................................................................................................................ 27 7.4.11 Face Location ........................................................................................................................................................ 28 7.4.12 Dendrobium Dyke Monitoring................................................................................................................................. 28 8 CONTINGENCY PLAN ..........................................................................................................................................29 8.1 SCOPE.....................................................................................................................................................................29 8.2 CONTROL PROCEDURES ............................................................................................................................................30 8.2.1 Principal Monitoring Controls ................................................................................................................................. 30 8.2.2 Secondary Monitoring Controls .............................................................................................................................. 30 8.3 PUMPING .................................................................................................................................................................30 8.4 CONTINGENCY ACTIONS ............................................................................................................................................34 8.4.1 Grouting, PUR Injection and Similar Activities ....................................................................................................... 34 8.4.2 Sealing ................................................................................................................................................................... 34 8.5 TRIGGER ACTION RESPONSE PLANS ...........................................................................................................................35 8.6 PRINCIPAL TARP FLOW CHART .................................................................................................................................37 8.7 PRINCIPAL TARP .....................................................................................................................................................39 8.8 SECONDARY TARP ..................................................................................................................................................40 9 CLOSURE PLAN ...................................................................................................................................................45 9.1 SCOPE.....................................................................................................................................................................45 9.2 ASSUMPTIONS ..........................................................................................................................................................45 9.3 CONTROL PROCEDURES ............................................................................................................................................46 9.3.1 Water Inflow Scenario Analysis.............................................................................................................................. 46 9.4 HYDRAULIC SEAL DESIGN ..........................................................................................................................................48