Class A and M footing depths pls??

Hi Misty,
it'll depend on what you are building (single, double, three storey),
construction type ie: floating (or waffle pod) slab or traditional slab design, 
it may also depend on other information on geotech report, an M class slab can be re classified too…
contour survey etc may have a bearing although not always…
an engineer would have to design the structural plans to suit individual criteria…
there may also be internal beams, screw piers etc etc

speak to a structural engineer if you need more accurate info though