HVO 2009 Annual Environmental Management Report - Final

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Coal & Allied – Hunter Valley Operations Surface Water Monitoring Results for Hunter River The surface water monitoring results for the Hunter River are shown in Table 26 and Figure 29 to Figure 31. The Hunter River was sampled at two sites upstream (W109 and W1) and three sites downstream (H1, H2 and H3) of point sources of runoff (Wollombi Brook and Farrells Creek) to monitor the impact of mining on the Hunter River. Site W109 is located furthest upstream of operations and H3 furthest downstream. The river stations have been traditionally sampled monthly subject to safe access. Coal & Allied has built up a large knowledge base from 30 years of river monitoring, and in that time the DWE (Department of Water and Energy) (now DECCW) have greatly increased the level of real time river monitoring within the river. The DoP and DECCW have agreed that there is no risk posed to river management if the frequency of monitoring was reduced. During 2009 surface water sampling at Hunter River sites was conducted quarterly. Results for water quality remained within historical trends, and there were no indication that mining activity adversely affected river water quality. Table 26: Surface Water Results from Hunter River Sites for 2009 Location pH EC (S/cm) TSS (mg/L) Average Min Max Average Min Max Average Min Max W109 8.3 8 8.5 790 510 1,090 31 15 44 W1 8.3 8.2 8.5 820 520 1,140 36 14 70 W3 (Hunter River) 8.3 8.1 8.4 913 640 1,200 31 4 56 W4 (Hunter River) 8.5 8.3 8.6 853 580 1,200 27 11 44 H1 8.2 7.7 8.8 732 590 890 39 15 83 H2 8.3 7.7 8.4 697 490 920 31 14 68 H3 8.2 8.1 8.3 667 500 850 18 6 32 AEMR 2009 75
Coal & Allied – Hunter Valley Operations Hunter River pH, EC and TSS 2009 1000 8.6 Electrical Conductivity (us/cm) Total Suspended Solids (mg/L) 100 10 8.5 8.4 8.3 8.2 8.1 8 7.9 7.8 7.7 1 W109 W1 W3 W4 H1 H2 H3 Location EC TSS pH 7.6 Figure 29: Hunter River Mean pH, EC and TSS Surface Water Monitoring pH Results for Hunter River Recorded pH levels remained within historical trends, and there were no indications that mining activity affected pH. The pH at W4 (Figure 30) shows a steady increase above the ANZECC criteria of 8.5 (maximum pH value of 8.6 in 2009) however these values remain within historical values. 9.5 Hunter River pH Trends 9 8.5 pH (pH units) 8 7.5 7 6.5 6 Jan 09 Feb 09 Mar 09 Apr 09 May 09 Jun 09 Date Jul 09 Aug 09 Sep 09 Oct 09 Nov 09 Dec 09 W109 W1 W3 W4 H1 H2 H3 ANZECC pH upper limit ANZECC pH lower limit Figure 30: Hunter River pH Trends AEMR 2009 76
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HVO 2009 Annual Environmental Management Report - Final

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