Well based on some complicated calculus I did in my head... (actually calculus sucks... glad I only have to take this 1 class ever!). Yes, I made a 'careful guess' and stayed close to an exterior wall (no heat needed on the outside of the building, all the heating pipe was layed about 1ft from the outer walls most of the way around, i drilled about 8" from the footing... and hoped for the best.
