Compact the soil in the trench base that has a hand tamper or vibrating plate compactor. This phase is usually neglected. The excavator, and in many cases hand shovels, can disturb and loosen the top inch or two of soil, Which’s plenty of to generate your wall settle—settling is poor! https://codypuyce.bloguetechno.com/how-sandstone-retaining-wall-blocks-can-save-you-time-stress-and-money-66364526