Wambo Coal AEMR 2010-2011 - Peabody Energy

2010-2011 AEMRAs discussed in the last AEMR, WCPL submittedthe first North Wambo Creek Discharge Reportduring September 2009 in response to two flowevents in February and April 2009. The objectivesof the flow assessment report included:Providing a comparative assessment of theconditon of the NWC Diversion to several otherreference sites within South Wambo Creek andApple Tree Creek; andProvide recommendations for any remedialworks required.For further information regarding any remedialrecommendations within the NWC Diversion, pleaserefer to Section 5.1.4.2.8.3 Water DischargeWCPL’s water management system is currentlybalanced by the adjustment of flow from the variouswater sources and storages. However, whereexcess water is generated, WCPL has facilities todischarge water. This is done in accordance withEPL529, DA 305-7-2003, the Hunter River SalinityTrading Scheme (HRSTS), and Managed Envelopeof Residuals Flood (MERF) Scheme.EPL 529 approves discharge into Wollombi Brookwhen the flow is greater than 500 ML/day at theBulga gauging station, provided other conditions ofthe HRSTS and MERF are satisfied.On 30 June 2011, WCPL held a total of 61 saltcredits under the HRSTS scheme. During thereporting period there were 10 water discharge daysunder HRSTS or MERF, totalling 690.52MLdischarge.Table 2.5 – 2010-2011 Water BalanceWater Sources (ML)Hunter River 92Wollombi Brook 171United Borehole 0Rainfall/run off 3966Underground Seepage 588Open Cut Seepage 724Wollemi Sump 30Site Wells 0Total Water Input 5571Water Usage (ML)Dust Suppression615CHPP Consumption1020Underground362United0Domestic Usage3Total Water Usage 2000Water Loss (ML)Evaporation – Mine Water& Tailings Dams2489HRSTS/MERF Discharge 690Water Balance 392Page 33