Wambo Coal AEMR 2011-2012 - Peabody Energy
Share Embed Flag
Download ePaper

Wambo Coal AEMR 2011-2012 - Peabody Energy

Wambo Coal AEMR 2011-2012 - Peabody Energy Wambo Coal AEMR 2011-2012 - Peabody Energy

peabodyenergy.com
from peabodyenergy.com More from this publisher
01.11.2014 Views

2011-2012 AEMR Trigger levels for EC however have been derived from historical monitoring data (using a minimum of 24 data points), where available, in accordance with the Australia and New Zealand Environment and Conservation Council Guidelines for Fresh and Marine Water Quality (ANZECC Guidelines) (ANZECC, 2000). Additional surface water monitoring in natural waterways (except Hunter River) is also undertaken after rainfall events of more than 20 mm rain in 24 hours (12 am to 12 am). Mine water dams including Eagles Nest Dam are also included in the surface water monitoring program. The monthly surface water quality results for the reporting period are discussed below. For the complete monthly surface water quality and rainfall event sampling results during the reporting period, please see Appendix 2C. All surface water samples are monitored for pH and Electrical Conductivity (EC) on a monthly basis. Surface water samples from natural waterways (except Hunter River) and mine water dams including Eagles Nest Dam, South Dam and Chitter Dam are also analysed for total dissolved solids (TDS) and Total Suspended Solid (TSS). In addition, monitoring of oil and grease concentrations is also undertaken. Although monitoring of additional mine water dam sites are not required under the SWMP, mine water quality is undertaken by WCPL for salt budgeting and for operational purposes. EC and pH are measured in the field while samples are collected and analysed in the laboratory for TDS, TSS, oil and grease. Surface water samples are collected in accordance with AS/NZS 5667.4:1998 – Guidance on sampling from lakes, natural and man-made and AS/NZS 5667.6:1998 – Guidance on sampling of rivers and streams. A number of surface water monitoring sites within North Wambo Creek, South Wambo Creek and Stony Creek were dry during the monthly sampling regime and therefore no water samples could be obtained. Surface water monitoring undertaken in accordance with SWMP indicated that WCPL’s mining operations had minimal influence on the water quality of the surrounding natural water courses during the reporting period. 3.4.2.2 pH Analysis The recorded pH values from the surface water monitoring program during the reporting period are presented graphically and tabulated in Appendix 2C. The pH levels for the Eagles Nest Dam during the 2010-2011 reporting period were within the pH criteria and ranged from 8.50 to 9.20. In general, mine water quality within Eagles Nest Dam is typically more alkaline than pH values of the surrounding natural creeks and streams. The recorded pH for the creeks and streams surrounding the operation varied depending on rainfall and volumetric flow. Wollombi Brook recorded average pH values of 7.54, 7.73, 7.53 and 7.64 at surface water monitoring sites SW01, SW02, SW03 and SW40 respectively. All monthly recorded pH values were within the SWMP surface water quality criteria and consistent with average pH result from the previous reporting period. South Wambo Creek and Stony Creek recorded average pH values of 7.43, 7.63 and 6.88 at surface water monitoring sites SW06, SW07 and SW08 respectively. All monthly recorded pH values were within the SWMP surface water quality criteria and consistent with average pH result from the previous reporting period. North Wambo Creek recorded pH average pH values of 7.53 and 7.67 at surface water monitoring sites SW05 and SW27 respectively. There were no results obtainable at SW32 and only one result at SW04 due to dry conditions within the creek at each time of sampling during the reporting period. The one sample obtained at SW04 returned a pH value pH 8.00 and is within the SWMP surface water quality criteria. The recorded pH values monitored at SW39 and the WRD surface water sites SW43 to SW46 (i.e. Doctors and Longford Creeks) were within the surface water quality criteria and consistent with average pH result from the previous reporting period. 3.4.2.3 Total Suspended Solids The recorded TSS values from the surface water monitoring program during the 2011-2012 reporting period are graphically presented and tabulated in Appendix 2C. Variations in TSS for the Eagles Nest Dam during the 2011-2012 reporting period were within surface water quality criteria limits and ranged from

2011-2012 AEMR Variations in TSS observed throughout the year within the surrounding natural creeks and streams were attributable to significant recent rainfall events. The monthly recorded TSS concentrations within the natural waterways surrounding the operations generally remained below the criteria of 120 mg/L, with the exception of several results as discussed below. Wollombi Brook recorded average TSS concentrations of 8mg/L, 17mg/L, 11mg/L and 23mg/L at surface water monitoring sites SW01, SW03, SW02 and SW40 respectively. All monthly recorded TSS concentrations were within the SWMP surface water quality criteria. All annual average TSS concentrations for Wollombi Brook during the 2011-2012 AEMR reporting period were consistent with the average TSS concentrations recorded in the previous 2010-2011 AEMR. South Wambo Creek and Stony Creek recorded average TSS concentrations of 15 mg/L, 24 mg/L and

<strong>2011</strong>-<strong>2012</strong> <strong>AEMR</strong><br />

Variations in TSS observed throughout the year<br />

within the surrounding natural creeks and streams<br />

were attributable to significant recent rainfall events.<br />

The monthly recorded TSS concentrations within<br />

the natural waterways surrounding the operations<br />

generally remained below the criteria of 120 mg/L,<br />

with the exception of several results as discussed<br />

below.<br />

Wollombi Brook recorded average TSS<br />

concentrations of 8mg/L, 17mg/L, 11mg/L and<br />

23mg/L at surface water monitoring sites SW01,<br />

SW03, SW02 and SW40 respectively. All monthly<br />

recorded TSS concentrations were within the<br />

SWMP surface water quality criteria. All annual<br />

average TSS concentrations for Wollombi Brook<br />

during the <strong>2011</strong>-<strong>2012</strong> <strong>AEMR</strong> reporting period were<br />

consistent with the average TSS concentrations<br />

recorded in the previous 2010-<strong>2011</strong> <strong>AEMR</strong>.<br />

South <strong>Wambo</strong> Creek and Stony Creek recorded<br />

average TSS concentrations of 15 mg/L, 24 mg/L<br />

and

logo

products

Resources

Company

Terms of service
Privacy policy
Cookie policy
Cookie settings
Imprint
Change language
Made with love in Switzerland
© 2024 Yumpu.com all rights reserved

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!