SUBSIDENCE MONITORING USING THE GLOBAL POSITIONING SYSTEM(GPS)
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WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
Page 1 of 27
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Sustainable Development Plan
Subsidence Monitoring Program
West Wallsend Colliery
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
Page 2 of 27
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Contents
1.Introduction ........................................................................................................... 3
1.1 Background .................................................................................................. 3
1.2 Purpose and Scope ........................................................................................ 3
1.3 Relationship with Other Documents ................................................................. 3
2. Statutory Requirements ..................................................................................... 6
2.1 Project Approval ............................................................................................ 6
2.2 SMP Approval ............................................................................................... 6
3. Subsidence Monitoring Program .......................................................................... 7
3.1 Vertical Subsidence and Ground Movement ...................................................... 7
3.1.1 Built Feature Monitoring ........................................................................................................... 7
3.2 Visual Subsidence Inspections ......................................................................... 7
4. Evaluation of Monitoring Results.......................................................................... 8
5. Review and Improvement................................................................................... 8
5.1 External Reporting ......................................................................................... 8
5.2 Review ......................................................................................................... 8
6. Accountabilities ................................................................................................. 9
7. References ....................................................................................................... 9
7.1 Legislation .................................................................................................... 9
7.2 West Wallsend Colliery ................................................................................... 9
8. Appendix 1 – Stage one subsidence Monitoring Program LW44 (Chainage 1175 to 300 m) 11
8.1 Stage 1 Subsidence Monitoring Program LW44 ................................................ 11
8.2 Proposed Monitoring .................................................................................... 11
8.3 Built Features Monitoring .............................................................................. 11
8.4 Inspections and Monitoring ........................................................................... 12
8.4.1 Landscape Feature Monitoring ................................................................................................. 12 8.4.2 Management Plan Monitoring and Inspections ........................................................................... 14
8.5 Recording, Reporting and Review of Monitoring Results .................................... 15
8.6 Monitoring Method and Accuracies ................................................................. 15
9. Appendix 2 - survey monitoring marks and procedures ........................................ 16
10. Appendix 3 – landscape Features Inspection Form ............................................... 19
11. appendix 4 - Subsidence Cracking Report Form................................................... 23
12. Plan – KA3- 996 .............................................................................................. 25
13. Control and Revision History ............................................................................. 26
13.1 Document Information ................................................................................. 26
13.2 Revisions .................................................................................................... 26
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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1. INTRODUCTION
1.1 Background
Oceanic Coal Australia Pty Limited (OCAL) manages and operates West Wallsend Colliery (WWC) on behalf of the Macquarie Coal Joint Venture (MCJV). OCAL is owned by Xstrata Coal. West Wallsend Colliery (WWC) is located approximately 25 kilometres southwest of Newcastle in the Lake Macquarie Government Area (refer to Figure 1).
WWC has been granted Project Approval (PA 09_0203) for continued operations through the approval of the West Wallsend Colliery Continued Operations Project (WWCCOP) Environmental Assessment (EA), assessed under Part 3A of the Environmental Planning and Assessment Act 1979 (EP&A Act). Project Approval was granted on 25 January 2012 by the NSW Department of Planning and Infrastructure (DP&I) Director-General. The Project
Approval allows for the continuation of mining operations at WWC and enables the consolidation of existing approvals for underground mining and infrastructure utilised for WWC. The WWCCOP assessed the coal reserves for WWC, the existing pit top and other related ancillary surface facilities, including the Mining Services Facility. WWC and associated mining infrastructure are shown in Figure 1.
This Subsidence Monitoring Program has been prepared as a component of the WWC Longwall 44 & 45 Extraction Plan (WWC SD PLN 0061), in accordance with Condition 5(m),
Schedule 3 of the Project Approval.
The program also proposes monitoring to be undertaking in accordance with the DRE Subsidence Management Plan (SMP) approval condition. A staged monitoring approach has been developed in consultation with DRE to include, Stage 1 from the start position on LW44 to twice the angle of draw for zero subsidence on Wakefield Road (chainage 1175 m to 300 m). The remaining section of LW44 (300 m to 0 m) will be monitored by the stage two monitoring program and WWC will seek approval from DRE for the monitoring
programme.
1.2 Purpose and Scope
The purpose of this plan is to outline the subsidence monitoring programme for WWC for longwall 44.
The stage one subsidence monitoring program incorporates LW44’s extraction area from
chainage 1175 m to 300 m.
This monitoring program includes the SMP/Extraction Plan Area for Longwall 44 at WWC as shown on Plan KA3-996.
1.3 Relationship with Other Documents
This Subsidence Monitoring Program has been developed as a component of the WWC
Longwall 44 & 45 Extraction Plan (WWC SD PLN 0061), and should be read in conjunction with the Extraction Plan/SMP.
The monitoring program outlined in this document is a summary of the extensive subsidence monitoring outlined in more detail in the following documents:
WWC SD PLN 0050 Water Management Plan;
WWC SD PLN 0052 Biodiversity Management Plan;
WWC SD PLN 0057 Built Features Management Plan;
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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WWC SD PLN 0058 Land Management Plan;
WWC SD PLN 0059 Public Safety Management Plan;
WWC SD PLN 0060 Subsidence Contingency Plan;
WWC Survey Monitoring Marks and Procedures; and
WWC SD PLN 0062 Aboriginal Cultural Heritage Management Plan.
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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2. STATUTORY REQUIREMENTS
2.1 Project Approval
The Project Approval for WWC was assessed under the Environmental Planning and Assessment Act 1979 (EP&A Act). Approval for WWCCOP was granted by the DP&I Director-General on 25 January 2012. The requirement for this Subsidence Monitoring Program
arises from Condition 5(m), Schedule 3 of the WWC Project Approval which is shown in Table 1 below.
Table 1 – Project Approval requirements
Project Approval Condition Section of this Document
Extraction Plan 5. The Proponent shall prepare and implement an Extraction Plan for second workings
on site to the satisfaction of the Director-General. Each extraction plan must:
(m) include a subsidence monitoring program, which has been prepared in consultation with DRE and OEH, to: Entire document
provide data to assist with the management of the risks associated
with subsidence; 3.0
validate the subsidence predictions; 4.0
analyse the relationship between the predicted and resulting
subsidence effects and predicted and resulting impacts under the plan and any ensuing environmental consequences; and
4.0
inform the contingency plan and adaptive management process. 4.0
2.2 SMP Approval
This Subsidence Monitoring Program has been developed in accordance with DRE’s SMP approval condition 12. In the event that changes to this document are required by DRE, the amended program will also be re-submitted to OEH & DP&I.
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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3. SUBSIDENCE MONITORING PROGRAM
The Stage One proposed subsidence monitoring for LW44 is shown on plan “Proposed Subsidence Monitoring Stage 1 – Start to 300 m KA3-996”. A summary of the monitoring program is provided in the sections below.
3.1 Vertical Subsidence and Ground Movement
LW44 subsidence induced ground movement will be measured by comparing Airborne Laser Scanning (ALS) survey results pre mining and post mining. A pre mining ALS survey was conducted in July 2012. The ALS monitoring will provide a full coverage of ground movement for the longwall panel as opposed to previous methods of centre and cross line surveys on a limited number of points.
Surveys using ALS methodology will minimise the environmental impacts in the Sugarloaf
State Conservation Area (SCA) associated. OEH granted WWC a licence by OEH for the installation of survey marks and monitoring activities in the SSCA. In addition to the ALS surveys cross lines above LW44 and Central Creek as shown on plan KA3-996 (at chainage 350m) will be installed to monitor subsidence movements in relation LW44. Surveys will be undertaken in accordance with the WWC Survey Monitoring Marks and Procedures (refer to appendix 2) and record subsidence movement, prior to subsidence effects and posting mining.
3.1.1 Built Feature Monitoring
The built features in the stage one subsidence monitoring program area include dirt access tracks and trails located in the SSCA as show in Figure 2. The public safety risks on access tracks will be monitored by undertaking daily inspections of the access tracks and trails in the Subsidence Affected Surface Zones (SASZ), during subsidence affectation.
The six Transgrid towers (90TL101 & 92/93TL33E, 90TL102 & 92/93TL34E, 90TL103, & 92/93TL35E) are (DGS 2012) located at angles of draw of between 62˚ to 76˚ from the proposed extraction limits of the longwalls and are outside the predicted 20 mm subsidence contour or 26.5˚ angle of draw. The four towers (90TL101 & 92/93TL33E & 90TL102 & 92/93TL34E) were mined beneath by the Newstan Colliery longwalls and have been fitted with reinforced concrete cruciform footings thereby reducing the impacts of strains on the towers from WWC’s longwalls. Two of the towers (90TL103 & 92/93TL35E) are located outside the Newstan longwall area and consist of steel and concrete footings. The six towers are unlikely to be affected by measureable vertical subsidence due to their distance from the extraction area.
It is possible however, that the towers are within the distance that could be affected by far-field horizontal displacements. The low level of predicted far-field horizontal displacements and strains are unlikely to impact on the towers or require mitigation works. WWC will monitor the survey marks on the tower footings and ground marks at each tower for X, Y & Z movements and implement the Trigger Action Response Plans (TARP) in the Transgrid Transmission Tower Management Plan to manage any subsidence movements of a greater
magnitude then predicted.
3.2 Visual Subsidence Inspections
In addition to the monitoring of subsidence and ground movements, WWC will undertake visual inspections to identify subsidence impacts on the environment and built features. These include but are not limited to the following:
Daily inspection of access tracks and trails when affected by subsidence ;
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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Monthly inspection of the general SASZ and landscape features; Weekly inspection of the Transgrid transmission towers and surface; Post mining assessment of landscape features; and Post remediation inspections of subsidence cracks and impacts.
These visual inspections are outlined in more detail Appendix 1 and in the relevant management plans included within the WWC Extraction Plan (refer to Section 1.3).
4. EVALUATION OF MONITORING RESULTS
All subsidence monitoring results are to be reported in the WWC Annual Review and the WWC End of Panel Report which are both provided to relevant government agencies. The Annual Review and End of Panel Report will provide a summary of subsidence monitoring results and a comparison against subsidence predictions for the relevant extraction area. This comparison will be undertaken by a suitably qualified subsidence consultant and if
relevant the WWC subsidence model will be updated to provide revised predictions for the following longwall.
In the event that subsidence predictions are revised, the affected management plans (e.g. built features plans) will be updated accordingly and submitted to relevant government agencies and placed on the WWC website (www.westwallsendcolliery.com.au).
Additionally, subsidence monitoring results received from built feature monitoring (e.g.
services easement and F3 Freeway) will be assessed immediately against trigger levels developed and reported accordingly.
5. REVIEW AND IMPROVEMENT
5.1 External Reporting
An Annual Review will be prepared in accordance with the Project Approval and will document subsidence monitoring results as outlined in Section 4. Exceedance of any relevant subsidence predictions or performance criteria will be reported in accordance with the Project Approval to any relevant stakeholders.
An End of Panel Report will also be prepared for each longwall and submitted to DRE. The End of Panel Report will also include a summary of the subsidence monitoring results as outlined in Section 4.
5.2 Review
Ongoing monitoring and review on the performance and implementation of this document will be undertaken in accordance with WWC Environmental Management Strategy.
In accordance with Condition 5 of Schedule 6, WWC shall review, and if necessary revise, the strategies, plans, and programs required under Project Approval to the satisfaction of
the Director-General, within 3 months of the submission of:
(a) the submission of an annual review; (b) the submission of an incident report; (c) the submission of an audit report; and (d) any modification to the conditions of this approval (unless the conditions require
otherwise),
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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The Subsidence Monitoring Program will reflect changes in requirements, technology, operational procedures and subsidence predictions. Updated versions of the approved plan will be made publicly available on the WWC website (http://www.westwallsendcolliery.com.au/).
6. ACCOUNTABILITIES
Role Accountabilities for this document
WWC Operations Manager
Provide sufficient resources for the effective implementation of this plan.
WWC Subsidence Management Coordinator
Coordinate the subsidence monitoring requirements of the WWC Extraction Plan;
Report to relevant stakeholders the subsidence results of this plan and update of subsidence predictions as required by this plan;
Coordinate the reporting required by this plan
WWC Mine Surveyor
Undertake subsidence monitoring requirements of the WWC Extraction Plan;
Coordinate the reporting of monitoring results under this plan.
All employees and contractors
Comply with all requirements of this plan.
Report all subsidence impacts to their supervisor immediately.
7. REFERENCES
7.1 Legislation
Environmental Planning and Assessment Act 1979
Mining Act 1992
Mine Subsidence Compensation Act 1961
7.2 West Wallsend Colliery
WWC SD PLN 0061 Longwall 44 & 45 Extraction Plan and Subsidence Management Plan
WWC SD FWK 0013 WWC Environmental Management Strategy
WWC SD PLN 0050 Water Management Plan
WWC SD PLN 0052 Biodiversity Management Plan
WWC SD PLN 0057 Built Features Management Plan
WWC SD PLN 0058 Land Management Plan
WWC SD PLN 0059 Public Safety Management Plan
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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WWC SD PLN 0060 Subsidence Contingency Plan
WWC SD PLN 0062 Aboriginal Cultural Heritage Management Plan
WWC SD PLN 0077 F3 Freeway Management Plan
WWC & Telstra Corporation Ltd Management Plan Longwall Mining (LW44 & 45) Western Domain Adjacent to Telstra Network.
WWC SD PLN Jemena, Caltex, Optus, Nextgen, Western Domain Subsidence
Management Plan.
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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8. APPENDIX 1 – STAGE ONE SUBSIDENCE MONITORING
PROGRAM LW44 (CHAINAGE 1175 TO 300 M)
8.1 Stage 1 Subsidence Monitoring Program LW44
The purpose of this program is to outline the subsidence monitoring to be undertaken for LW44 chainage 1175 m to 300 m as shown on plans KA3-996.
8.2 Proposed Monitoring
The proposed subsidence monitoring for LW44 Stage 1 relates to the extraction between 1175 m to 300 m chainage as shown on plan KA3-996 (refer to Section 12). The surface of the Stage 1 subsidence monitoring program for LW44 includes bushland which forms part of the Sugarloaf State Conservation Area (SSCA) managed by the Office of Environment and Heritage (OEH). LW44 subsidence induced ground movement will be monitored by
comparing Airborne Laser Scanning (ALS) survey results pre mining and post mining. A pre mining ALS survey was conducted in July 2012. The ALS monitoring will provide a full coverage of ground movement for the longwall panel as opposed to previous methods of centre and cross line surveys on a limited number of points. Surveys using ALS methodology will minimise the environmental impacts in the Sugarloaf State Conservation Area (SSCA).
WWC has a licence from OEH allowing the installation of survey marks and monitoring activities in the SCA in accordance with established WWC environmental management procedures. In addition to ALS surveys a cross line above LW44 as shown on plan KA3-996 (at chainage 350m) will be installed and monitored as shown in Table 1. Surveys of the LW44 cross line will be undertaken in accordance with the WWC Survey Monitoring Marks and Procedures (refer to appendix 2) and record subsidence movement in 3D (X, Y & Z) prior to subsidence effects and posting mining.
Following comments from DRE, WWC will install a survey monitoring line as shown on plan KA3-996 in Central Creek (a tributary of Palmers Creek) to monitor for subsidence movements at the archaeological site Axe Grinding Grove 3 (AGG3) and the valley either side of AGG3. The survey line (AGG3 Line) as shown on plan KA3-996 will be installed and monitored as per the Survey Monitoring Marks and Procedures (refer to appendix 2) and will record subsidence movements in 3D (X, Y, Z).
8.3 Built Features Monitoring
The six Transgrid towers (90TL101 & 92/93TL33E, 90TL102 & 92/93TL34E, 90TL103, & 92/93TL35E) are to be located at angles of draw of between 62˚ to 76˚ from the proposed extraction limits of the longwalls and are outside the predicted 20 mm subsidence contour or 26.5˚ angle of draw. The towers are unlikely to be affected by measureable vertical subsidence due to their distance from the longwalls.
However the towers are within the distance that could be affected by far-field horizontal
displacements. The low level of predicted far-field horizontal displacements and strains are unlikely to impact on the towers or require mitigation works. WWC will install and monitor the survey marks shown on plan KA3-996 on the towers footings and ground marks at each tower to record subsidence related movements in X, Y & Z as shown in Table 1. Surveys will be conducted as per the Survey Monitoring Marks and Procedure (refer to appendix 2). Weekly inspections of the towers and surface for subsidence impacts (refer to Table 1) will be undertaken from the start of LW44 and will continue in consultation with DRE until
approval to cease monitoring is granted.
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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8.4 Inspections and Monitoring
This section outlines the inspection and monitoring regime to be implemented to ensure the public safety for the extraction of Longwall Panel 44.
8.4.1 Landscape Feature Monitoring
WCC personnel will undertake pre mining and monthly inspections of landscape features as shown in Table 1 in the SASZ and record these on the landscape features form (refer to
appendix 3). The pre and post mining landscape feature monitoring will be compared against the landscape features impact criteria in the PA to assess performance against the criteria as, described in the Land Management Plan.
In addition, inspections of the general surface including creek lines within the SASZ will be undertaken on a monthly basis and recorded on the WWC Surface Cracking Inspection Report Form (refer to appendix 4). The sections of Riparian Paperbark Peppermint Forest
GDE (refer to the Biodiversity Management Plan) and drainage lines of Central within the subsidence affectation zone will be inspected to identify any subsidence cracking and loss of surface water flows. The monthly surface inspections will continue in consultation with DRE until approval is granted to cease. These inspections will record the surface condition and status of the existing control measures including: -
General surface subsidence cracking and drainage lines for loss of surface water flow;
demarcation warning tape on landscape features; Transgrid transmission tower subsidence impacts; existing OEH gates (Quarry Trail) on entry points to SASZ, and warning signs.
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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Table 1: Public Safety & Subsidence Monitoring Program
SMP Approval Conditions
Description
Features to be Monitored
12.a) Inspection Regime Surveying of monitoring marks on and Transgrid
transmission towers legs and ground marks :-
Pre mining survey
After 200 m of extraction
After the completion of LW44.
Surveying of monitoring marks on LW44 cross line and
AGG3 line prior to subsidence effects and post mining.
Monthly surface and landscape feature visual
inspection by WWC.
Weekly visual inspection of Transgrid Transmission
Towers from the start of LW44.
12.b) Layout of Monitoring
Points
Layout of proposed survey marks shown on plans KA3-
996.
12.c) Parameters to be
measured
Parameters to be measured on survey monitoring
marks including: -
X,Y,Z on tower legs and ground marks
Strains ground marks.
Parameters to be monitored for general surface and
landscape feature inspection form are provided in
appendices 3 and 4. Inspections of the surface at
the Transgrid Towers and drainage lines will be
recorded in the Subsidence Cracking Report Form
(refer to Appendix 4).
12.d) Monitoring methods and
accuracy
As per WWC Survey Monitoring Marks and Procedures
(refer to appendix 2).
Visual inspections recorded on subsidence cracking and
landscape feature inspection forms, GPS camera, and
handheld GPS accurate to +/- 2 to 5m. Tilt meter
accurate to +/- 0.004mm.
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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SMP Approval Conditions
Description
Features to be Monitored
12. e) Timing & frequency of
surveys & inspections
Surveying of monitoring marks on and Transgrid
transmission towers legs and ground marks :-
Pre mining survey
After 200 m of extraction
After the completion of LW44.
Weekly inspections from the start of LW44 of Transgrid
Transmission Towers. These will continue in
consultation with DRE until approval is granted to
cease monitoring.
Surveying of monitoring marks on LW44 cross line &
AGG3 line prior to subsidence effects and post mining.
Monthly inspections at surface and landscape feature
within SASZ. These will continue in consultation with
DRE until approval is granted to cease monitoring.
12. f) Recoding and reporting
of monitoring results
Survey monitoring results recorded on WWC survey
spreadsheets.
Recorded on subsidence cracking and landscape
feature inspection forms and then recorded in the
WWC ArcGIS mapping system.
Reported fortnightly & quarterly to DRE in Subsidence
Management Status Reports. Within an end of panel
report for LW44.
8.4.2 Management Plan Monitoring and Inspections
All inspections and monitoring will be undertaken in accordance with:
WWC SD PLN 0061 Longwall 44 &45 Extraction Plan and Subsidence Management Plan
WWC SD FWK 0013 WWC Environmental Management Strategy
WWC SD PLN 0050 Water Management Plan
WWC SD PLN 0052 Biodiversity Management Plan
WWC SD PLN 0057 Built Features Management Plan
WWC SD PLN 0058 Land Management Plan
WWC SD PLN 0059 Public Safety Management Plan
WWC SD PLN 0060 Subsidence Contingency Plan
WWC SD PLN 0062 Aboriginal Cultural Heritage Management Plan
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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WWC SD PLN 0077 F3 Freeway Management Plan
WWC SD FRM 0158 Surface Cracking Inspection Form
WWC & Telstra Corporation Ltd Management Plan Longwall Mining (LW41) Western Domain Adjacent to Telstra Network.
WWC SD PLN Jemena, Caltex, Optus, Nextgen, Western Domain Subsidence Management Plan
8.5 Recording, Reporting and Review of Monitoring Results
The results of inspections will be recorded in the field on the landscape features inspection form, GPS camera, and handheld GPS. The impacted areas will be recorded in the WWC ArcGIS mapping system to record photos and results within a central database.
The results of inspection and monitoring will be reported to the PSE in the Subsidence Management Status Report in accordance with SMP condition 15.7 and will report against the conditions in 17 (a) to 17 (g). The status report will provide the PSE and other relevant stakeholders with information specifically addressing public safety by addressing the above conditions.
WWC will review the monitoring results from the program to inform the extent of the SASZ’s.
8.6 Monitoring Method and Accuracies
The proposed survey monitoring will be conducted in accordance with the document WWC Survey Monitoring Marks and Procedures attached in Appendix 2.
The results from inspections will be recorded in the field on the landscape features inspection form, GPS camera, and handheld GPS. GPS measurements are accurate to between +/- 2 to 5m.
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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9. APPENDIX 2 - SURVEY MONITORING MARKS AND
PROCEDURES
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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10. APPENDIX 3 – Landscape Features Inspection Form
Longwall: Date: LW Face Position:
Landscape Feature Morphology
Landscape Feature Type
Landscape Feature No.
Description
Height (m)
Length (m)
Face Slope (˚)
Aspect (˚)
Start (Coordinates)
Finish (Coordinates)
Landscape Feature Attributes
Lithology
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
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Bedding Spacing
Bedding Dip/ Strike
Bedding Planarity/infill
Joint Spacing
Joint Dip/ Strike
Joint Planarity/infill
Joint Spacing
Joint Dip/ Strike
Joint Planarity/infill
Photos
Cracking Locations
Crack Width (mm)
Crack Depth (m)
Vegetation Grass/Shrubs
Vegetation Trees
Other/ comments
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
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Review: 09/05/2015
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Hazard Identification
Potential instability
Potential rock falls
Potential tree falls
Location of hazards in relation
to public access points
Mitigation works required
(signage, demarcation,
physical removal
Public Safety comments
Identified Possible Instability
Block/slip size
Likelihood of Instability
Activation trigger
Risk Rating AGS
West Wallsend Colliery
Sustainable Development Plan
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Subsidence Monitoring Program
Status: Approved
Version: 2.0
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Sketch
West Wallsend Colliery
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WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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11. APPENDIX 4 - SUBSIDENCE CRACKING REPORT FORM
Instructions 1. This form is to be used for inspections of the surface for subsidence and public safety
effects, above the panel, creek lines and Transgrid Transmission Towers. 2. A separate inspection form is to be used for inspections relating to cliff lines and steep
slopes. Details
Longwall
Date
Completed By
Inspection Type
(Circle one) Longwall Area - Monthly Access Tracks – Daily Other Describe :
Details of Cracking / Ponding
Location & –
Feature Type
Length
(m)
Width
(mm)
Depth
(m)
Surface Strata Topography
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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Have cracks been uploaded to GIS?
Have photos been taken?
Subsidence warning signs present
Existing gate locked at Quarry Trail
Barrier tape checked
Warning signs checked
Any evidence surface cracking or damage
on Transgrid Transmission Tower
Have relevant stakeholders been informed?
General Comments:
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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12. PLAN – KA3- 996
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
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13. CONTROL AND REVISION HISTORY
13.1 Document Information
Property Value
Approved by Environment and Community Manager
Document Owner Subsidence Management Coordinator
Effective Date 20/03/2013
Keywords Subsidence, SMP, monitoring
13.2 Revisions
Version Date reviewed
Review team
(consultation) Nature of the amendment
1 Jan 2013 E&C Dept Original document LW44 & 45 extraction plan.
2 May 2013 E&C Dept Update to included DRE comments in plan.
West Wallsend Colliery
Sustainable Development Plan
WWC SD PLN 0086
Subsidence Monitoring Program
Status: Approved
Version: 2.0
Effective: 20/03/2013
Review: 09/05/2015
Page 27 of 27
THIS DOCUMENT IS UNCONTROLLED UNLESS VIEWED ON THE INTRANET