HVO 2009 Annual Environmental Management Report - Final

Coal & Allied – Hunter Valley Operations
Groundwater Monitoring SWL Results for Hobden’s Gully and South Facilities Piezometers
The SWL at E5038/5, H5032/5 and H5038/5 and Hobden’s Well have remained steady during the reporting
period with minimal fluctuation from historical data (Figure 53). Although piezometers S4 and S6 were
recorded as dry the standing water level has been recorded for maximum bore depth.
0
Hobden's Gully and South Facilities SWL Trends
5
10
15
Standing Water Level (m)
20
25
30
35
40
45
50
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
Hobden's Well S4 S6 E5038/5 H5032/5 H5038/5
Figure 53: Hobden's Gully and South Facilities Groundwater SWL Trends
Alluvial Lands Levee Bank Groundwater
The key piezometers used for the interpretation of potential seepage into North Pit Void through or under the
cut off wall of North Pit Levee are PZ1CH200, PZ2CH400, PZ3CH800, PZ4CH1380, PZ5CH1800,
PZ6CH2450, GA3, HV3 and HV4. These piezometers are sampled quarterly subject to safe access.
Piezometer HV4 was not sampled in 2009 reported to be consistently dry. Piezometers PZ1CH200 and
PZ2CH400 have undergone screen cleaning on the 24 July 2009. This process subjected these sites to
significant volumes of water sourced outside the boreholes and subsequently have had an impact on data
consistency at these sites.
Monitoring results for 2009 are shown in Table 37 and in Figure 54 to Figure 56.
AEMR 2009 104