HVO 2009 Annual Environmental Management Report - Final

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