Extraction Plan - Peabody Energy

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Extraction Plan – North Wambo Underground Mine Longwalls 7 and 8Table A3-1Program to Collect Baseline Data for Future Extraction PlansAspect of Future ExtractionPlanProposed MonitoringSubsidence Subsidence monitoring undertaken in accordance with the Subsidence Monitoring Program. The subsidence monitoring data collected during extraction of Longwalls 7 and 8 will be used to validate revisedsubsidence predictions for future Extraction Plans.It is considered that the proposed subsidence monitoring is adequate to collect sufficient subsidence data for use infuture Extraction Plans.Groundwater Groundwater monitoring (groundwater level and quality) undertaken in accordance with the GWMP and NWCSRS(monitoring will include the two new piezometers discussed in the NWCSRS, P-NWU-03a and P-NWU-05a)(Figure A3-1).A number of new groundwater monitoring sites are proposed to be installed within WCPL-owned mining tenements.These groundwater monitoring sites would be incorporated in the GWMP.At the time of writing 20 new groundwater monitoring sites have been installed (including P-NWU-03a and P-NWU-05a)as shown on Figure A3-1. Data collected from these groundwater monitoring sites (including piezometers andstandpipes) will contribute towards baseline data for North Wambo Underground Mine Longwalls 9 and 10 and theSouth Wambo Underground Mine.The groundwater monitoring data collected will be used to validate predicted environmental consequences ongroundwater resources for future Extraction Plans. If this validation finds environmental consequences have exceededthose predicted, the groundwater monitoring data will be used to provide revised predictions of environmentalconsequences.It is considered that the proposed groundwater monitoring is adequate to collect sufficient groundwater data for use infuture Extraction Plans.EP/SMP LW7-8 Rev B December 2012 Page A3-2
Extraction Plan – North Wambo Underground Mine Longwalls 7 and 8Table A3-1Program to Collect Baseline Data for Future Extraction PlansAspect of Future ExtractionPlanProposed MonitoringSurface Water Surface water monitoring (flow, quality and geomorphology) undertaken in accordance with the SWMP (Figure 12 ofthe Extraction Plan).The surface water monitoring data collected will be used to validate predicted environmental consequences on surfacewater resources for future Extraction Plans. If this validation finds environmental consequences have exceeded thosepredicted, the surface water monitoring data will be used to provide revised predictions of environmental consequences.The recommendations made in the surface water impact assessment review for Longwalls 7 and 8 will be implementedas follows:– Accurate rating curves will be developed for each gauging station site to enable flows to be estimated fromrecorded water level data. In the absence of extensive manual gaugings the rating curves will be developed usinga hydraulic model of each flow monitoring site reach. As part of this process surveyed cross sections will becompleted for use in the hydraulic model and to enable recorded water levels to be reduced to the local rating curvegauge datum.– The current methodology relating to bank stability monitoring (i.e. the cross sectional surveys) will be reviewed anda consistent methodology will be applied for future bank stability monitoring (e.g. all future cross sections will besurveyed with a consistent methodology).It is considered that the proposed surface water monitoring is adequate to collect sufficient baseline surface water datafor use in future Extraction Plans.Land Monitoring of impacts to land in general in accordance with the LMP. The monitoring conducted in accordance with the LMP will be used in the review of observed subsidence impacts forfuture Extraction Plans.Biodiversity Monitoring of biodiversity in accordance with the FFMP (Figure 13 of the Extraction Plan). Biodiversity monitoring data collected will be used to validate predicted environmental consequences on biodiversity forfuture Extraction Plans. If this validation finds environmental consequences have exceeded those predicted, themonitoring data would be used to provide revised predictions of environmental consequences.Aboriginal Heritage If required for future Extraction Plans, baseline data for Aboriginal heritage would be collected prior to disturbance inareas not previously disturbed. The baseline data collected would include photographic records, detailed informationregarding the dimensions, composition and features and the occurrence of mining-induced impacts.EP/SMP LW7-8 Rev B December 2012 Page A3-3
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Extraction Plan - Peabody Energy

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