Table 4.1
Exceedance analysis summary for each monitoring bore
Bore ID
Analysis comments
– Cobalt, chromium, copper, cadmium, aluminium, manganese, nickel, selenium and zinc concentrations consistently exceeded their respective 95% species protection level for freshwater throughout the monitoring period. – Arsenic concentrations exceeded the 95% species protection level for all monitoring events, except between June and November 2023. – Lead concentrations were generally below the 95% species protection level, except for December 2023 to January 2024, April 2024 and August to September 2024 sampling rounds. – Cyanide concentrations were below the 95% species protection level and the laboratory level of reporting (LOR) for the entire monitoring period. – EC and TDS exceeded the 80 th percentile value from the EPP throughout the entire monitoring period. – pH was consistently reported below the 20 th percentile value from the EPP. Groundwater sampled at MB2 was found to be highly acidic (pH <2.6). – Data was only available from September 2022 to March 2023 (six data points). – Cobalt, chromium, copper, cadmium, aluminium, manganese, nickel, and zinc concentrations consistently exceeded their 95% species protection level for freshwater throughout the entire monitoring period. – Cyanide and lead concentrations were below their respective 95% species protection level the entire monitoring period. All cyanide results were reported below the LOR. – Arsenic concentrations exceeded the 95% species protection level for all monitoring events, except during the October 2022 and March 2023 sampling rounds. – Selenium concentrations only exceeded the 95% species protection levels during the December 2022 and March 2023 sampling round. – EC and TDS exceeded the 80 th percentile value from the EPP throughout the entire monitoring period. – pH was consistently reported below the 20 th percentile value from the EPP. Groundwater sampled at MB4-D was found to be highly acidic (pH <3.7) – Arsenic, cobalt, chromium, copper, cadmium, aluminium, manganese, nickel, and zinc concentrations consistently exceeded their respective 95% species protection level for freshwater throughout the entire monitoring period. – Cyanide concentrations were below the 95% species protection level and the LOR the entire monitoring period. – Lead concentrations were generally below the 95% species protection level, except for January to February 2024, April 2024 and May to August 2024 sampling. – Selenium concentrations generally exceeded the 95% species protection level, except for the August to October 2022, March to June 2023, September 2023, March 2024 and September 2024 sampling rounds. – EC and TDS exceeded the 80 th percentile value from the EPP throughout the entire monitoring period. – pH was consistently reported below the 20 th percentile value from the EPP. Groundwater sampled at MB5-S was found to be highly acidic (pH <3.4). – Arsenic, cobalt, chromium, copper, cadmium, aluminium, manganese, nickel, and zinc concentrations consistently exceeded their respective 95% species protection level throughout the entire monitoring period. – Cyanide concentrations were below the 95% species protection level and the LOR the entire monitoring period. – Lead concentrations were generally below the 95% species protection level, except during the December 2023, February 2024, April to May 2024 and July to September 2024 sampling rounds. – Selenium concentrations generally exceeded the 95% species protection level, except during the August to November 2022, March to April 2023, September 2023, November 2023 and March 2024 sampling rounds. – EC and TDS exceeded the 80 th percentile value from the EPP throughout the entire monitoring period. – pH was consistently reported below the 20 th percentile value from the EPP. Groundwater sampled at MB5-D was found to be highly acidic (pH <3.6).
MB2
MB4-D
MB5-S
MB5-D
GHD | Heritage Minerals Pty Ltd | 12638246 | Groundwater Quality Review 2024 18
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