Metropolitan Coal Project Independent ... - Peabody Energy

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METROPOLITAN COAL PROJECT INDEPENDENT ENVIRONMENTAL AUDIT Conclusion: The Waste Management Plan and segregation of waste streams practised at Metropolitan Coal provide for minimisation of wastes going to landfill and reuse of waste material where practicable. 4.16 Water Management 8 [Project Approval Schedule 4 condition 14 and 15] 4.16.1 Water Management Plan [Project Approval Schedule 4 condition 15] The Surface Facilities Water Management Plan prepared for the surface facilities area and two ventilation shaft sites and the Water Management Plan for Long-walls 20 to 22 have been prepared to satisfy Project Approval Schedule 4 conditions 14 and 15. The Surface Facilities Water Management Plan was approved by DoP on 14 April 2011. 4.16.2 Site Water Management Metropolitan Coal presently draws its water from three main sources: Water captured on site - Rainfall (as well as any incidental runoff (e.g. from dust suppression activities) is contained by a network of drains, pits, sediment ponds and dams. Water that comes into contact with the mine or mining processes is ‘dirty water’. To minimise the collection of dirty water the site water management system includes a network of drains and embankments that prevent and divert clean runoff around the surface facilities operations area. All dirty water is pumped to a centralised water treatment plant (WTP) for treatment and recycling for operational needs or discharged to Camp Creek (in accordance with EPL 767) if site storages are full. Water pumped from the underground mine is also considered dirty water and is sent to the WTP for treatment and recycling. Camp Creek - Camp Creek is an ephemeral, second order stream that runs adjacent to the southern edge of the Metropolitan Colliery surface facilities area. Extraction of water from Camp Creek is regulated by Surface Water Licence 10SL049311, the Water Act 1912 and the Water Management Act 2000. Metropolitan Coal annual entitlement under the Camp Creek extraction licence is 130ML. As Camp Creek is an ephemeral stream, water supply for Metropolitan Colliery use from this source is dependent on rainfall. When insufficient water is available from Camp Creek, increased water is drawn from the potable water supply. Treated water discharges to Camp Creek occur under EPL 767. Monthly monitoring and reporting occurs for pH, Total Suspended Solids (TSS), oil and grease, and total discharged volumes. Sydney Water potable supply: use of potable water (Sydney Water) for mine purposes only occurs when insufficient water is available from Camp Creek and / or the site water storage network. The on-site water storages for Metropolitan Colliery are: Water Storage Approximate Water Storage Capacity Turkeys Nest Dams 1 & 2 8 ML Sediment Ponds 1, 2 & 3 4 ML Taj Mahal 0.5 ML Camp Creek Weir 0.5 ML Hill Tank 0.2 ML Water Supply Tanks 0.4 ML 8 Steve Perrens – Evans and Peck 39 trevor brown & associates applied environmental management consultants aemc
METROPOLITAN COAL PROJECT INDEPENDENT ENVIRONMENTAL AUDIT The Metropolitan Coal Water Savings Action Plan (WSAP) has resulted in significant reductions in potable water consumption sourced from the Sydney Water supply. Commitments to continually building on the WSAP initiatives involve increasing the efficiency of overall water use for the Metropolitan Coal operations and minimisation of the potable water consumption and off-site water releases. 4.16.3 Discharges to Camp Creek The site water management system continuously monitors turbidity and prevents discharges of water to Camp Creek that exceed the EPL 767 criteria. Water that exceeds the criteria is further treated to ensure that water discharged complies with the EPL criteria. Monitoring results during the 2010-2011 were compliant with the regulatory requirements, with the exception of the TSS measurement for January and pH level for August 2010. Table 7: Summary of Discharge Water Quality 2010 and 2011 pH TSS mg/l Oil and Grease mg/l 1 August 2009 to 31 July 2010 8.2 to 8.5
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