Compact the soil in the trench base that has a hand tamper or vibrating plate compactor. This stage is commonly neglected. The excavator, and in some cases hand shovels, can disturb and loosen the very best inch or two of soil, Which’s ample to create your wall settle—settling is negative! https://tituszwuqn.tribunablog.com/details-fiction-and-sandstone-quarry-45483114