CSR Darra Remediation

The Darra CSR project involved the large-scale remediation and civil earthworks of a former quarry and brickwork factory site located 18.5 kilometres southwest of Brisbane CBD. The site, approximately 20 hectares in size, was subject to a mining lease, which required remediation to an agreed criterion outlined in a Mine Closure Plan (MCP). DECC was engaged as the Principal Contractor to manage all aspects of the project, including hazardous material removal, site remediation, and extensive civil earthworks, ensuring compliance with strict environmental regulations.

Environmental Management: DECC was responsible for the construction and maintenance of sediment basins, erosion and sedimentation (ERSED) controls, water and dust management, air quality monitoring, dewatering operations, and checking pH and turbidity levels. These measures were crucial in managing environmental impacts and ensuring compliance with the Environmental Protection Licence (EPL) issued by the Queensland Department of Environment and Science (DES).

Hazardous Materials Removal and Demolition: The project involved the safe removal of hazardous materials, including asbestos, and the demolition of site structures, slabs, and footings. DECC adhered to all safety and environmental protocols, ensuring that the site was cleared of hazardous materials and prepared for remediation.

Remediation Works: DECC undertook the excavation of approximately 600,000m² of reject material, asbestos-contaminated soils, hydrocarbons, unprocessed material, contaminated waste, and reclaimed material. The purpose of this work was to sort, spread, screen, crush, and/or dispose of these materials off-site in accordance with the Remediation Action Plan (RAP) and the Mine Closure Plan (MCP).

Civil Earthworks: DECC conducted extensive grubbing, clearing, and site mulching activities, followed by excavation, site carting, and the construction of haul roads. The project also involved importing, filling, and compacting approximately 1,000,000m³ of select fill material to raise the site’s RL by approximately 2 meters, thereby achieving a higher quality subgrade for future subdivision works. Additional activities included shaping, contouring, slope stabilisation, and the construction of swales and drainage systems to suit the final landscaped landform.