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Slab-on-Grade with Rack Loading

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    I am trying to do a quick estimation of the necessary slab thickness for a slab supporting heavily loaded racks. The rack legs are on 3'-0"x 8'-0" centers. There will be racks back-to-back with only a 1'-0" space between the racks. Each leg load is 25,000 lb. If I use the PCA charts, should I use 50,000 lbs for my leg load or 25,000 lbs? I am inclined to think 50,000 lbs, but I want to make sure.

Wesley C. Werner