Hopeland groundwater sampling results and findings
Bore locations map
Former Linc Energy bore sites
Kummerows Road bore sites
Former Mineral Development lease
Former Linc Energy Site – lot 40 DY85
Monitoring bores installed on the former Linc Energy site - findings
In 2017, the department installed a groundwater monitoring network around the perimeter of the former Linc site. In 2020, this network was expanded to include two bores on the Linc Energy site
The Linc Energy site is contaminated as a result of undertaking UCG activities, therefore findings of benzene, cyanide and other contaminants is expected above guideline values.
Sampling on the Linc site has shown the presence of UCG contaminants benzene and total cyanide.
These bores are not used for irrigation, or human or stock consumption.
As a result of the groundwater contamination on the former Linc Energy site, the site is listed on the Contaminated Land Register (CLR) which recognises that the site is heavily contaminated and requires ongoing monitoring and remediation.
At present, groundwater is flowing back towards the Linc site.
Data is listed below for benzene and total cyanide levels in the 13 groundwater monitoring bores on the former Linc Energy site since 2021.
*some samples failed QA checks because the head pressure in the bores required distilled water to be introduced to safely install the pump and reduce gas generation. As a result, diluted bore water was sampled. The department’s quality control program later determined that these results were not representative of the groundwater.
Monitoring bores installed on Kummerows Road - findings
In December 2020, as part of the further expansion of the groundwater monitoring network, two additional groundwater monitoring bores were installed in Kummerows Road. Kummerows Road is a narrow road reserve between 20-30 metres wide and the bores are approximately 650 metres west of the boundary of the Linc Energy site.
Sampling of the Kummerows Road bores commenced in April 2021. Due to the slow moving nature of groundwater returning to the bore after drilling, it takes time before a representative sample can be taken from a new bore. These bores required regular purging over a period of time to ensure samples were representative.
Landholders do not access water from the Kummerows Road bores – they exist solely for monitoring. These bores are not used for irrigation, or human or stock consumption.
Specialists from the Department of Environment and Science have reviewed the results from the Kummerows Road bores.
The deeper of the two Kummerows Road bores, shows the presence of both benzene and total cyanide contaminants at concentrations that exceed livestock drinking water guidelines (ANZECC, 2000 Water Quality Guidelines) and human drinking water guidelines (NHMRC, 2011 Australian Drinking Water Guidelines).
This bore also has naturally high levels of inorganic salts, as measured by the total dissolved solid concentrations, which makes it unsuitable for human consumption.
In April 2021, there was one reading of total cyanide in the shallow bore above drinking and stock water guidelines, but this has since dropped below guideline values.
The analysis of the samples indicates that the concentration of contaminants is trending down.
Data is listed below for benzene and total cyanide in the two groundwater monitoring bores located at Kummerows Road.