Yeah you need to read your document again and very closely. I have seen a few documents that say something about part-time employees are excluded and they define the term part-time like you have written. But to over come the concerns ETA is bring up it clearly says if they ever work 1,000 hours in a 12 month period they enter the plan. The practical effect of this "class" exclusion is it is another way of saying you don't enter until you work 1,000 hours.