Orica has been undertaking remediation activities at its Kooragang Island site to address arsenic contamination of soil and groundwater as a result of historical operations.
In July 2014, a Management Order (20131407) (PDF 2.4MB) was issued by the Environment Protection Authority (EPA) detailing the works to be undertaken to implement a remedial solution at the site to prevent offsite migration of arsenic contaminated groundwater. The order also includes groundwater monitoring, updating of an Environmental Management Plan and development and implementation of a communication strategy to update key stakeholders on the program of works.
In October 2014 cap and containment remediation technology was selected as the preferred remediation option to meet the objectives of the Management Order. It is envisaged that the cap and containment remediation technology will consist of the installation of an impermeable subsurface wall to prevent the flow of groundwater through the impacted soil in the onsite source area and a surface cap to reduce infiltration.
Any works conducted in an area which could potentially be affected by the arsenic contamination is required to comply with the Environmental Management Plan (EMP) (PDF 2.2MB) which was developed to ensure that the land affected by contamination is managed to protect both people and the environment. This plan has been provided to landowners and users and is reviewed annually and provided again to landowners and land users.
In April 2014, a Management Order (20131408) (PDF 496.8KB) was issued by the EPA to address nutrient contamination (ammonia, nitrate and other sources of nutrient) at the site. The order includes providing annual reports to the EPA on source control activities, development of an Environmental Management Plan, groundwater sampling and development and implementation of a communication strategy.
Any works conducted in an area which could potentially be affected by nutrient contamination is required to comply with the Nutrient Environmental Management Plan (PDF 2.7MB) which was developed to ensure that land potentially affected by contamination is managed to protect both people and the environment.