LabNews 18-07 WA Landfill Waste Classification and Waste Definitions 1996 (as amended 2018)

LabNews 18-07 WA Landfill Waste Classification and Waste Definitions 1996 (as amended 2018)

Posted 01 July 2018
The State Government of Western Australia has recently passed legislation that permits clean fill (and other fill material meeting certain thresholds) to be used on development and construction sites without attracting any waste avoidance and resource recovery fees. In order for a sample to be considered uncontaminated the Department of Water and Environmental Regulation requires both the total concentration and leaching tests to assess the quality of the fill material. This LabNews addresses the analytical requirements to meet these criteria.

Introduction of Uncontaminated Fill Criteria

Introduced into the guidelines is Table 6, Maximum concentrations (thresholds) of relevant chemical substances and limits of relevant physical attributes for uncontaminated fill.

In order for a sample to be considered uncontaminated the Department of Water and Environmental Regulation requires both the total concentration and leaching tests to assess the quality of the fill material.

Table 7, The minimum sampling and testing standards for uncontaminated fill has been amended to allow for testing of substances based on land use history and statistical evaluation of the laboratory results. This includes a reference to the list of potentially contaminating activities, industries and land uses (Appendix B) of the Assessment and management of contaminated sites document (DER 2014). Therefore Appendix B is key to determining what tests are relevant from Table 6.

ALS has devised two new packages to assess the criteria laid out in Table 6. The P/19-4 package meets the requirements stipulated by the Maximum Concentration and the P/19-5 package meets the requirements of the Leaching test. These packages can only be used if testing for the entire suite of analysis. If selecting individual analytes please contact Client Services to receive a quotation to ensure the correct method is used to meet the required reporting limit. These packages can be seen in Table 1. ALS has also created two smaller packages P/19-4 Metals and P/19-5 Metals to compare samples against the metals and metalloids limits.

Background

The State Government of Western Australia has recently passed legislation that permits clean fill (and other fill material meeting certain thresholds) to be used on development and construction sites without attracting any waste avoidance and resource recovery fees.

‘Clean fill’ is defined in the Waste Definitions to mean raw and excavated natural material such as clay, gravel, sand, soil or rock files that:

  • has been excavated or removed from the earth in areas that have not been subject to potentially contaminating land uses including industrial, commercial, mining or agricultural activities; and
  • has not been processed except for the purposes of achieving desired particle size distribution; and/or removing naturally occurring organic materials such as roots; and
  • does not contain any acid sulphate soil; and
  • does not contain any other type of waste.
Table 1 Uncontaminated Fill Analytical Requirements
Table 2 Contaminant threshold (CT) values for waste not requiring a leach test
Figure 1 Summary of guidelines reached or exceeded
Figure 2 Example tabulation of results in comparison to dec Landfill waste classification contaminant threshold

WA Waste Classification Packages

Potentially contaminated soil in Western Australia destined for disposal via landfill must be classified as Class I, II, III, IV or V (WA DWER Landfill Waste Classification and Waste Definitions April 2018).
To categorise the soil, total concentrations of specified analytes are compared against the upper limits of the Contaminant Thresholds (CT -Table 3) and Concentration Limits (CL - Table 4) where CT values are absent. In order to cater to these analytical requirements ALS has the following packages displayed in Table 2 which can be utilised.

Automated Comparison Reporting

The ALS generated Guideline Comparison Report compares the laboratory results against selected guideline limits.
Results that are equal to or greater than the upper limit are highlighted in red enabling simple identification of exceedances (see Figure 2). The report assists by removing the need for manual comparison of a large number of data points. Additionally, a summary of all breaches is presented at the beginning of the report (see Figure 1 example). The aim of this report is to assist ALS clients in the accurate and rapid assessment, facilitating on-site management options or further classification analysis as required (e.g. ASLP determination). To receive this report type simply request the report format GL_Generic_Test on the chain of custody accompanying the samples.

References

Barton, C. (2018). Use of clean fill on development sites not subject to levy. Retrieved from http://hwlebsworth.com.au/use-of-clean-fill-on-development-sites-not-subject-to-levy/

Department of Water and Environmental Regulation (2018). Landfill Waste Classification and Waste Definitions 1996 (as amended 2018)

Department of Environmental Regualtion (2014). Assessment and management of contaminated sites

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