Specifications include, but are not limited to: 2301, “Wood Posts” 2303, “Field Handling and Preservative Treatment of Wood Products” 1.2 The posts shall be surfaced four sides (S4S) with square cut ends. Scant allowance of 1/2” (13 mm) is allowed for 4” (100 mm) and 6” (150 mm) dimensions. 1.3 All sign mounting holes in all classes of posts shall be 3/8” (10 mm) holes and treated after boring. The first hole shall be 1-1/2” (40 mm) from the top of the post and every 6” (150 mm) thereafter. (See Table I for the number of holes per post) The holes shall be drilled on the centerline of the 4” (100 mm) side of the post and perpendicular to the surface. A maximum tolerance of 1/16” (2 mm) will be permitted in the alignment and spacing of the holes. The holes shall not vary from the perpendicular in any direction by more than 1/8” per foot (10 mm per meter). 1.4 No other holes shall be permitted