Wambo Coal AEMR 2010-2011 - Peabody Energy

2010-2011 AEMRNovember and December 2010 of 121.2mm and54.5mm respectively and again during May andJune 2011 of 77.5mm and 98.6mm respectivelysupported this recovering trend.Groundwater WellsGW02 and GW11 located on the Brosi propertywere monitored throughout 2010-2011. The waterlevels remained mostly static for the period.Groundwater monitoring in 2010-2011 identifiedrecovery of water levels in GW11 and GW02towards the end of the reporting period.piezometers with recovering water levels towardsthe end of the reporting period. During this reportingperiod P301 water levels were maintained within itsrespective depth to water level criteria.Due to insufficient water being available to samplethroughout the reporting period at P315, only onewater level was recorded in June 2011. The oneresult recorded was within the respective criteria forP315.During this reporting period both water levels inGW02 and GW11 remained within their respectivewater level criterion. In contrast, both water levelsin GW02 and GW11 during 2009-2010 droppedbelow their respective standing water levels on oneoccasion before recovering.GW08 and GW09 are located on WCPL propertyand were monitored throughout the 2010-2011period. The water levels remained mostly static forthe period. Groundwater monitoring in 2010-2011identified only minor decreases and fluctuations ofwater levels at the end of the reporting period. Asrecorded in the 2009-2010 reporting period, thewater level at GW09 again remained outside thewater level criterion during the 2010-2011 reportingperiod.100 and 200 Series PiezometersThe 100 and 200 series piezometers locatedadjacent to the Wollombi Brook were monitoredthroughout 2010-2011. All standing water levelswere within their respective criteria’s for all the 100series piezometers, with most of the 100piezometers displaying recovering water levelstowards the end of the reporting period. Thisrecovery trend coincided with good rainfall, a total of98.6mm during June 2011.The 200 series piezometers also displayed thesame characteristics as the 100 series piezometersin terms of recovering water levels towards duringJune 2011. There was no access to P202 during theJune 2011 round of monitoring, due to the heavyrainfall providing for unsafe driving conditions.300 Series PiezometersThe 300 series piezometers are located adjacent toStony Creek. P301 piezometer also displayed thesame characteristics as the 100 and 200 seriesPage 53