I will put 8" deep footings (plus the 4" thick slab) 12" total depth on pads that we build masonry steps on . There are tons of builders that just pour a 4" slab and build steps. I can't sleep at night doing that , Id feel like I'm ripping them off .
But 42" high of material sitting on that is a lot of weight . You could dig around the perimeter n pour some footings
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