In trench excavation, when the bottom does not contain stone larger than one inch, the trench may be excavated to grade. Which option describes this condition?

• A. Stone not larger than one inch in size allowed.
• B. Stone larger than two inches required.
• C. No stones allowed at all.
• D. Stone exactly one inch permitted.

Answer: (A)

The key idea is about the bottom material in a trench and what’s allowed when grading the bottom. If, during inspection, there are no stones larger than one inch in the trench bottom, you may bring the bottom down to grade. That’s because small stones or finer material are considered stable enough to grade smoothly without leaving large protrusions that could cause hazards during backfilling or laying pipe.

The option that matches this condition says that stone not larger than one inch in size is allowed. That directly reflects the requirement: as long as you don’t have stones bigger than one inch, you can excavate to grade.

The other statements introduce different restrictions (needing stones larger than two inches, banning stones entirely, or allowing exactly one inch) and don’t describe the same rule.