I need to run plumbing drain and water lines in a 8 inch block wall for the purpose of roughing in wall hung urinals, lavs, and floor set flushometer type water closets. What is the best method to do this, am I going to have to be there while the wall is being built?

The first part of your post gave me the impression the wall was already built until I read this.

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am I going to have to be there while the wall is being built?

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If the water and drainage \'s already in place and stubbed out the block masons don't need you on site when they build the wall. They know what to do. Good luck, Tom