HVO 2009 Annual Environmental Management Report - Final

Coal & Allied – Hunter Valley Operations
8
North Pit Alluvial Lands Groundwater pH Trends
7.5
pH (pH units)
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
DM2 DM3 DM4
Figure 48: North Pit and Alluvial Lands Groundwater pH Trends
Groundwater Monitoring EC Results for North Pit and Alluvial Lands Piezometers
The EC values remained constant with historical values with the highest average reading being 10,235μS/cm
for DM2 and the lowest average reading of 4,833μS/cm recorded at DM4 (Figure 49).
12,000
North Pit Alluvial Lands Groundwater EC Trends
11,000
10,000
9,000
Electrical Conductivity (uS/cm)
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
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
DM2 DM3 DM4
Figure 49: North Pit and Alluvial Lands Ground EC Trends
Groundwater Monitoring SWL Results for North Pit and Alluvial Lands Piezometers
The SWL in the monitored bores have remained relatively constant over the reporting period (Figure 50).
Piezometer DM1 is noted historically as a dry well, however a standing water level was recorded on two
sampling occasions in 2009.
AEMR 2009 101