Because deadlines make me peevish.
One: The past tense of tread is trod. Not treaded — trod.
Two: Even in its extended sense of “to inflict great damage,” decimate applies to countable things, like people, not to solid and singular things, like buildings. (In the strict sense, decimate refers to the old Roman punishment meted out when an entire military unit had done something disgraceful, like mutiny — lots were drawn, and one man in every ten was clubbed or stoned to death by his fellow-soldiers.)
Three: And the past tense of shine is shone.