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Elements and Performance Criteria

1. Prepare to classify soil samples
   • Review job request and any accompanying documentation to identify purpose of soil classification and client’s information needs
2. Identify any hazards and relevant safe work procedures associated with the types of site samples
3. Inspect supplied samples and test data, compare with specifications and record and report any discrepancies
4. Liaise with client when supplied samples, test data and/or job request forms do not comply with workplace procedures and resolve any problems
5. Assemble required equipment/materials and check that they are fit for purpose
6. Examine properties of soil samples
   • Assess appearance and feel of soil to determine moisture condition
7. Use moulding/indentation tests, penetrometer and/or density index data to determine soil consistency
8. Identify the soil’s major, secondary and minor components and the proportion of each
9. Assign a soil colour based on own observations and review of field log sheets
10. Determine soil structure based on own observations and review of available zoning, defect and cementing data recorded for undisturbed field samples
11. Review any additional observations and test data that may identify soil origin
12. Analyse available test results
    • Compare supplied mechanical test data with standard classification values for different soil types
13. Compare particle size and percentage composition data with standard classification values for different soil types
14. Compare other laboratory test results with own observations to confirm assignment of plasticity, grading and strength of soil samples
15. Recognise anomalies or unexpected results and, if necessary, recheck specimens and test results and conduct repeat tests to ensure reliable results
16. Record soil classification
    • Use standard symbols and descriptors to assign a valid soil classification
17. Record and store client’s soil classification, samples and test data in accordance with workplace procedures
18. Maintain confidentiality of client information in accordance with workplace procedures
19. Maintain a safe work environment
    • Use safe work procedures and personal protective equipment (PPE) to ensure personal safety and that of other personnel
20. Clean work area and collect, recycle or dispose of all waste in accordance with workplace procedures
21. Clean and check serviceability of test equipment before storage