You don't; this is not CTR reportable. This scenario is addressed in FinCEN's guidance somewhere (the FAQ I think).
If you see any large checks that, if combined, would equal over $10,000, I would document payees on the report. This can be problem with some businesses (such as real estate agents) and with employee bonuses at the end of the year.
Life without Jesus is like an unsharpened pencil - it has no point.