6. Noosa River DMP Ver0 (Combined)

                                        Requesting Endorsement of Sediment Sampling and Analysis Plan
                                             BMT (OFFICIAL)



                                                                       Level of          Level of
                                    NAGD or other
Parameter           Target PQL                         NEPM (mg/kg)    Investigation     Investigation
                                    Screening Level
                                                                       (Spit) - Pilot    (River)
PFAS - full suite                   -                  -               20% of Primary    50% of Primary
                    -
(28 analytes)                                                          Sites (3)         Sites (3)


Analytical Laboratories
The primary and secondary analysis of sediment samples will be undertaken by analytical laboratories
fully accredited by the National Association of Testing Authorities (NATA) for the required analyses.

Both laboratories will follow laboratory QC procedures in accordance with requirements outlined in
Appendix F of NAGD. This includes analysis of laboratory blanks, duplicates, certified reference
materials and spiked samples.

Analytical Tests and PQLs
All samples must be analysed for parameters outlined in Table 3.3.

Sample Containers
Sample volumes will be specified by the laboratory performing the analysis. Large cobble and gravel
fragments should be removed from the sample prior to storage in containers. Based on the proposed
analyses, the following sample containers would be required:

•   1 x 200 mL plastic bag – Acid Sulfate Soils
•   1 x 500 mL plastic bag - PSD
•   3 x 250 mL glass jar – TOC, Nutrients, Metals, Organics
•   1 x 200 mL HDPE Soil Jar – PFAS

3.9 Data Analysis and Assessment
Concentrations of contaminants measured in sediment samples will be compared to screening levels as
described in Table 3.2 and Table 3.3. Those being Table 1A(1) and Table 1B(6) of the NEPM Volume 2
Schedule B1 in the first instance to determine whether the material is acceptable for placement above
HAT, and subsequently, Table 2 of NAGD if required to determine potential impact of dredge plumes
and suitability for placement in subtidal areas.

Mean concentrations of chemical parameters at the upper 95% confidence level (95% UCL) will be
compared against screening levels described in Table 3.2 and Table 3.3. An assessment of the
material’s suitability for land-based re-use will follow the statistical analysis and the data evaluation
procedures in Section 3.4, Volume 5 Schedule B4 of the NEPM. In the event that 95th percentile upper
confidence limits for particular contaminants are exceeded, the next steps would be to follow the
decision tree in Volume 1, Schedule A of the NEPM to determine a site remediation plan or collect
further data describing the nature of contamination.

The statistical analysis will follow the approach given in Appendix A of NAGD, if necessary, to inform
whether the material is appropriate for placement in subtidal areas.

3.10 Data Quality Objectives and Data Validation
Data quality aim for this SAP is that the information collected is suitable for undertaking an assessment
of dredge material contamination in accordance with the framework provided in the NEPM and/or
NAGD. The data quality objectives encompass:


A10342 | 002                                          27                                 15 November 2021