one more question

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Moderator Post (s) for this thread: > drain backfill by tomh on 08/04/2004 > The 4 Inch Pipe..... by dodgeman on 08/04/2004

Thanks for the Info, but I have one more question. You used 10 inches for your thickness. I was wondering why you did not allow for the 4 in diameter drain pipe that will be taking up space within the 10 inches???