HVO 2009 Annual Environmental Management Report - Final

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Coal & Allied – Hunter Valley Operations Table 37: Groundwater Results from Alluvial Lands Levee Bank Groundwater for 2009 Location EC (S/cm) Average Min Max Average Min Max pH PZ1CH200 2,055 1,210 2,620 7.0 6.9 7.2 PZ2CH400 1,818 930 2,850 7.1 6.9 7.4 PZ3CH800 733 500 860 7.3 7.2 7.6 PZ4CH1380 1,095 630 2,170 7.3 6.9 7.9 PZ5CH1800 253 200 310 7.6 7.1 8.1 PZ6CH2450 615 570 690 7.4 7.0 7.8 HV3 788 640 890 7.5 7.3 7.8 HV4 NA NA NA NA NA NA GA3 715 670 760 7.2 7.0 7.3 Groundwater Monitoring pH Results for Alluvial Lands Levee Bank Piezometers Observed pH levels remained relatively stable throughout 2009 between values 6.9 and 8.1 (Figure 54). A slight increase across all sites was observed during December sampling. 9 Alluvial Lands Levee Bank Groundwater pH Trends 8.5 8 pH(pH units) 7.5 7 6.5 6 Jan 09 Feb 09 Mar 09 Apr 09 May 09 Jun 09 Jul 09 Date Aug 09 Sep 09 Oct 09 Nov 09 Dec 09 PZ1CH200 PZ2CH400 PZ3CH800 PZ4CH1380 PZ4CH1800 PZ5CH2450 GA3 HV3 Figure 54: Alluvial Levee Bank Groundwater pH Trends AEMR 2009 105
Coal & Allied – Hunter Valley Operations Groundwater Monitoring EC Results for Alluvial Lands Levee Bank Piezometers The EC levels in all of the monitored bores remained relatively low during the monitoring period (Figure 55). Some fluctuations were witnessed in PZ1CH200, PZ2CH400 and PZ4CH1380 however these differences are likely to be specific response to large volumes of out sourced water pumped in a purge and case cleaning that occurred on 24 July 2009. The highest average EC level was 2,055μS/cm at PZ1CH200 and the lowest average reading of 253μS/cm belonged to PZ5CH1800. 3,000 Alluvial Lands Levee Bank Groundwater EC Trends 2,500 Electrical Conductivity (uS/cm) 2,000 1,500 1,000 500 0 Jan 09 Feb 09 Mar 09 Apr 09 May 09 Jun 09 Jul 09 Date Aug 09 Sep 09 Oct 09 Nov 09 Dec 09 PZ1CH200 PZ2CH400 PZ3CH800 PZ4CH1380 PZ5CH1800 PZ6CH2450 GA3 HV3 Figure 55: Alluvial Levee Bank Groundwater EC Trends Groundwater Monitoring SWL Results for Alluvial Lands Levee Bank Piezometers Monitored SWL remained largely consistent throughout the year except for a noticeable decline in SWL at PZ2CH400 (Figure 56). The trend in PZ2CH400 water level is responding to a purge and case cleaning that occurred on 24 July 2009. Levee monitoring data indicates a stable water table adjacent to the levee, with no indication of potential seepage issues with the cut-off wall beneath the levee. AEMR 2009 106
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HVO 2009 Annual Environmental Management Report - Final

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