How should you handle discrepancies between field test results and shop tests?

• A. Ignore the discrepancy and proceed.
• B. Replace the field results with the shop results.
• C. Notify the engineer, review procedures, possibly re-test and adjust; maintain chain of custody.
• D. Only re-test the field results.

Answer: (D)

When field and shop test results don’t align, the priority is to verify the field data by re-testing the field results. Re-testing puts the field measurements under fresh scrutiny, helping determine whether the discrepancy stems from sampling, testing procedure, or instrument calibration, rather than acting on a possibly erroneous result. If the re-test still shows a difference, follow the project procedures: notify the engineer, review testing procedures, consider additional testing, and make any necessary adjustments, all while maintaining chain of custody. This approach prevents decisions based on a single questionable result and grounds actions in verified data.