Most of the roots will be in the top one to two feet of soil and will extend out to around three times the diameter of the canopy. Roots will not enter sealed pipes unless there is a break in the pipe. This used to be more of a problem back in the days when sewer pipes often leaked a little.

Since your picture didn't come through (guess you tried since this post is in the gallery), I can't tell what it might have had to do with the text of your post.