I have a drawing showing (2) .500 holes on the side of 3-1/2" NPS pipe. The hole note reads "2X 0.50 THRU". The drawing shows (2) holes spaced 1.35" apart. My question is, do the holes go through the pipe wall only, or totally through the pipe, creating 4 holes. There are no other views with hidden lines to indicate what the designers intentions might be. The drawing is governed by ASME Y14.5M-1994.