[Al Skierkiewicz]

Readings showing high levels of foot stomp are almost certainly "C" weighted. "A" weighting simulates the Fletcher-Munson human sensitivity curves which compensates for the reduced sensitivity to low frequencies and slightly reduced highs. I have modified your table with stated levels from a table in the Audio Engineering Handbook by K. Blair Benson from McGraw Hill. It includes OSHA industrial exposure limits but is by no means a comprehensive list.