Situation:

A small operational boat harbour with sediments containing high concentrations of Tributyltin (TBT) required dredging to maintain ready access for fishing vessels at all tides. It was essential that the dredged material was effectively managed in line with the environmental requirements. In addition to the initial dredging, lime treatment was also required as an integral part of the treatment process in the Acid Sulphate Soil Management Plan.

Our Approach:

Dredging Solutions dredged and dewatered 20,000 m³ of Potential Acid Sulphate Soils (PASS) sediment containing TBT from the designated area within the boat harbour. Considering the scale of the project and the additional treatment required, geotextile dewatering tubes were utilised for cost-effective removal of the sediment.

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Result:

Once dewatered to the desired moisture level, Dredging Solutions removed the sediments from site and transported them to an appropriately licenced facility for disposal. The site was subsequently rehabilitated with the establishment of grass cover.

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