RFI -Attachment 6 - Geotechnical Investigation Report CORE

Internal Quality Control Review and Glossary

General
1.    Laboratory QC results for Method Blanks, Duplicates, Matrix Spikes, and Laboratory Control Samples follows guidelines delineated in the National Environment Protection (Assessment of Site
      Contamination) Measure 1999, as amended May 2013 and are included in this QC report where applicable. Additional QC data may be available on request.
2.    All soil/sediment/solid results are reported on a dry basis, unless otherwise stated.
3.    All biota/food results are reported on a wet weight basis on the edible portion, unless otherwise stated.
4.    Actual LORs are matrix dependant. Quoted LORs may be raised where sample extracts are diluted due to interferences.
5.    Results are uncorrected for matrix spikes or surrogate recoveries except for PFAS compounds.
6.    SVOC analysis on waters are performed on homogenised, unfiltered samples, unless noted otherwise.
7.    Samples were analysed on an 'as received' basis.
8.    Information identified on this report with blue colour, indicates data provided by customer, that may have an impact on the results.
9.    This report replaces any interim results previously issued.


Holding Times
Please refer to 'Sample Preservation and Container Guide' for holding times (QS3001).
For samples received on the last day of holding time, notification of testing requirements should have been received at least 6 hours prior to sample receipt deadlines as stated on the SRA.
If the Laboratory did not receive the information in the required timeframe, and regardless of any other integrity issues, suitably qualified results may still be reported.
Holding times apply from the date of sampling, therefore compliance to these may be outside the laboratory's control.
For VOCs containing vinyl chloride, styrene and 2-chloroethyl vinyl ether the holding time is 7 days however for all other VOCs such as BTEX or C6-10 TRH then the holding time is 14 days.
**NOTE: pH duplicates are reported as a range NOT as RPD


Units
mg/kg: milligrams per kilogram                                           mg/L: milligrams per litre                                             ug/L: micrograms per litre
ppm: Parts per million                                                   ppb: Parts per billion                                                 %: Percentage
org/100mL: Organisms per 100 millilitres                                 NTU: Nephelometric Turbidity Units                                     MPN/100mL: Most Probable Number of organisms per 100 millilitres


Terms
Dry                            Where a moisture has been determined on a solid sample the result is expressed on a dry basis.
LOR                            Limit of Reporting.
SPIKE                          Addition of the analyte to the sample and reported as percentage recovery.
RPD                            Relative Percent Difference between two Duplicate pieces of analysis.
LCS                            Laboratory Control Sample - reported as percent recovery.
CRM                            Certified Reference Material - reported as percent recovery.
Method Blank                   In the case of solid samples these are performed on laboratory certified clean sands and in the case of water samples these are performed on de-ionised water.
Surr - Surrogate               The addition of a like compound to the analyte target and reported as percentage recovery.
Duplicate                      A second piece of analysis from the same sample and reported in the same units as the result to show comparison.
USEPA                          United States Environmental Protection Agency
APHA                           American Public Health Association
TCLP                           Toxicity Characteristic Leaching Procedure
COC                            Chain of Custody
SRA                            Sample Receipt Advice
QSM                            US Department of Defense Quality Systems Manual Version 5.3
CP                             Client Parent - QC was performed on samples pertaining to this report
NCP                            Non-Client Parent - QC performed on samples not pertaining to this report, QC is representative of the sequence or batch that client samples were analysed within.
TEQ                            Toxic Equivalency Quotient


QC - Acceptance Criteria
RPD Duplicates: Global RPD Duplicates Acceptance Criteria is 30% however the following acceptance guidelines are equally applicable:
Results <10 times the LOR : No Limit
Results between 10-20 times the LOR : RPD must lie between 0-50%
Results >20 times the LOR : RPD must lie between 0-30%
Surrogate Recoveries: Recoveries must lie between 20-130% Phenols & 50-150% PFASs
PFAS field samples that contain surrogate recoveries in excess of the QC limit designated in QSM 5.3 where no positive PFAS results have been reported have been reviewed and no data was
affected.
WA DWER (n=10): PFBA, PFPeA, PFHxA, PFHpA, PFOA, PFBS, PFHxS, PFOS, 6:2 FTSA, 8:2 FTSA


QC Data General Comments
1.    Where a result is reported as a less than (<), higher than the nominated LOR, this is due to either matrix interference, extract dilution required due to interferences or contaminant levels within
      the sample, high moisture content or insufficient sample provided.
2.    Duplicate data shown within this report that states the word "BATCH" is a Batch Duplicate from outside of your sample batch, but within the laboratory sample batch at a 1:10 ratio. The Parent
      and Duplicate data shown is not data from your samples.
3.    Organochlorine Pesticide analysis - where reporting LCS data, Toxaphene & Chlordane are not added to the LCS.
4.    Organochlorine Pesticide analysis - where reporting Spike data, Toxaphene is not added to the Spike.
5.    Total Recoverable Hydrocarbons - where reporting Spike & LCS data, a single spike of commercial Hydrocarbon products in the range of C12-C30 is added and it's Total Recovery is reported
      in the C10-C14 cell of the Report.
6.    pH and Free Chlorine analysed in the laboratory - Analysis on this test must begin within 30 minutes of sampling.Therefore laboratory analysis is unlikely to be completed within holding time.
      Analysis will begin as soon as possible after sample receipt.
7.    Recovery Data (Spikes & Surrogates) - where chromatographic interference does not allow the determination of Recovery the term "INT" appears against that analyte.
8.    Polychlorinated Biphenyls are spiked only using Aroclor 1260 in Matrix Spikes and LCS.
9.    For Matrix Spikes and LCS results a dash " -" in the report means that the specific analyte was not added to the QC sample.
10. Duplicate RPDs are calculated from raw analytical data thus it is possible to have two sets of data.
                                                         Eurofins Environment Testing 6 Monterey Road, Dandenong South, Victoria, Australia 3175                                         Page 4 of 6
     Date Reported: Sep 14, 2021                                             ABN : 50 005 085 521 Telephone: +61 3 8564 5000                                              Report Number: 822393-S