Clarification of 1910.23(a)(9) as it applies to fixed ladders and platforms.

OSHA interpretation letter answering questions on 29 CFR 1910.23(a)(9) for fixed ladders and platforms, stating that the described vessel wall-to-toeboard condition and the toeboard-terminated platform edge appear to be de minimis violations, and that 1910.23(b)(5) and 1910.27(d)(2)(ii) both apply to platforms used with fixed ladders.