There is no gravel there is no footing along outside where walls are.(perimeter)Very common, and perfectly legal here in Florida for many years. We seldon seem to have any trouble with them as sand is one of the absolute best foundational bases you can find..... as long as you keep it from eroding away.
That's what the gravel is for... to direct the water run-off.
BTW, that drawing shows a little less than 8" at the edge.
Ayuh,... So pack somemore dirt back into where it belongs, 'n re-grade so the water Stops errodin' it...30 yr.old home in Florida most have monolithic slabs..somehow this home got away from inspection? Soil (sand) eroding at some corners and other spots..any advice..
Say it was not built to code? That was 33 years ago. Water under the bridge. (Kind of like Obama... a mistake of supreme magnitude, but we're stuck now.)Erosion..underside of slab exposed in several areas..this house built 1979-80 ..was under the impression this not to code.Home in Ft.Pierce FL.