Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:1850:p107
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 1850 (pt 107/117)
Character Range: 665568–669762

field screening methods compared with the results of laboratory analyses, for example, that the results reported for field screening using a photo-ionisation detector are compatible with the results reported by the laboratory for volatile organic compounds. Where not compatible, an adequate explanation should be provided.

19.4          Laboratory screening methods
Laboratory screening methods are used to determine the type of contamination present and the constituents of a sample that might cause interferences in specific methods. Assessment reports should include appropriate discussion of the applicability and limitations of any screening methodologies used.
DQI for screening methods may be less rigorous than for specific analytical methods. Nevertheless, screening method performance should be known and should be expressed as a multiple of specific analytical method performance.

19.5          Methods specific for contaminants
Site assessors should ensure that appropriate discussion and documentation about the following issues is included in the assessment report:
    * that the analytical methods used for site validation are of appropriate precision and accuracy, and that the sensitivity and selectivity of the analytical methods are appropriate for the assessment of the risk
    * that the precision and accuracy criteria set out in the  QA/QC plan, for a given method and matrix, meet the performance expected of the reference method
    * that the quality of data supplied by the analytical laboratory meets the objectives of the testing laboratory's quality plan for at least 95% of test results for blanks, spikes, control samples, duplicates and holding times. (Note that these DQOs do not refer to field duplicate reproducibility or other measures of sampling variance. Sampling variance should be addressed in the choice of sampling method.)

19.6          Data quality indicators (DQIs)
Contaminated site practitioners should undertake an assessment of the DQIs that relate to both field and laboratory procedures, and provide appropriate documentation in the assessment report.
Completeness
A measure of the amount of usable data (expressed as %) from a data collection activity
Field considerations                                                                                                          Laboratory considerations                            Comments
All critical locations sampled                                                                                                All critical samples analysed according to SAQP      The required percentage completeness should be specified in the SAQP
All samples collected (from grid and at depth)                                                                                All analytes analysed according to SAQP              All required data must be obtained for critical samples and chemicals of concern
Standard operating practices (SOPs) appropriate and complied with                                                             Appropriate methods and PQLs                         Incompleteness is influenced by:
Experienced sampler                                                                                                           Sample documentation complete                            * field performance problems (access problems, difficulties on site, damage…)
Documentation correct                                                                                                         Sample holding times complied with                       * laboratory performance problems (matrix interference, invalid holding times…)
                                                                                                                                                                                       * matrix problems
Comparability
The confidence (expressed qualitatively) that data may be considered to be equivalent for each sampling and analytical event
Field considerations                                                                                                          Laboratory considerations                            Comments
Same SOPs used on each