HVO 2009 Annual Environmental Management Report - Final

Coal & Allied – Hunter Valley Operations
Location
EC (S/cm)
Average Min Max Average Min Max
pH
BZ8-3 1,610 - - 6.6 - -
HG1 4,213 4,130 4,270 7.5 7.3 7.9
HG2 4,258 4,190 4,360 7.4 7.2 7.8
HG2A 2,790 2,760 2,830 7.4 7.3 7.8
HG3 2,733 2,670 2,780 7.3 7.2 7.3
Table 39: Groundwater Results from Cheshunt Stage 2 Groundwater’s for 2009
Location
EC (uS/cm)
Average Min Max Average Min Max
pH
BUNC44D 1,875 1,130 2,540 6.4 6.3 6.5
BUNC46D 1,313 1,070 1,750 6.9 4.6 7.9
CHPZ12A 870 690 940 7.1 6.7 7.4
CHPZ12D 1,455 1,430 1,480 10.7 10.4 11.1
CHPZ13A 840 710 890 7.1 6.8 7.4
CHPZ13D 720 630 780 9.9 8.9 10.8
CHPZ14A 678 580 760 7.3 6.8 7.9
CHPZ14D 648 530 710 10.2 8.5 10.9
Groundwater Monitoring pH Results for Cheshunt Stage 1 Piezometers
Observed pH levels remained relatively stable throughout 2009 between values 6.5 and 8.1 (Figure 57).
Recorded pH across the monitored sites is within normal historical ranges. A noticeable increase trend is
experienced by bores in December sampling. It is unclear pending further sampling whether this is the
beginning of an increasing trend or a function of temporal conditions at the time of sampling.
AEMR 2009 109