Read the following passage:
During geotechnical soil exploration, drilling crews follow a strict sequential protocol to document and preserve core samples recovered from drilling augers. Upon extracting the split-spoon sampler from the borehole, the lead technician immediately cleans exterior drilling mud from the split tube before opening the casing. Once the casing is split open, the field geologist measures and logs total core recovery length prior to applying moisture-retaining wax sealants. After recording the length measurement, the core segments are coated in microcrystalline wax to prevent desiccation. Finally, before loading the preserved cores into transport crates, technicians affix barcoded depth identification tags to each tube.
Based on the passage, match each procedural action with its corresponding sequential timing.
- Cleaning exterior drilling mud from the split tubePerformed immediately after extracting the sampler, prior to opening the casing
- Measuring and logging total core recovery lengthExecuted once the casing is split open, before applying wax sealants
- Coating core segments in microcrystalline waxCompleted after logging the length measurement, to prevent desiccation
- Affixing barcoded depth identification tagsCarried out as the final step before loading preserved cores into crates