How to Pour a Concrete Slab (DIY) | Family Handyman
Flattening a sloped site means moving tons of soil. You can build up the low side or dig the high side into the slope and add a low retaining wall to hold back the soil. Pro tip: Your concrete slab will last longer, with less cracking and movement, if it's built on solid, well-drained soil. If you have sandy soil, you're in luck.