How many samples are required for 4 feet of patched TSI?

• A. 2
• B. 3
• C. 1
• D. 4

Answer: (C)

When sampling, length is paired with a single representative unit. For patched TSI, one sample is taken for each four-foot segment, so a patch that spans four feet is represented by a single sample. This approach assumes the patch is uniform along its length, so that one well-chosen sample (often taken from the middle of the patch) accurately reflects the entire section’s material and condition. If the patched length were longer, additional samples would be taken at roughly four-foot intervals; shorter patches would still be covered by one sample. Therefore, four feet of patched TSI require one sample.