HELLO and thank you. I am a complete amateur. I intend a new pre-cast block retaining wall (2.5 ft high total). However, in same area I had to remove Holly bush/tree of 10 inch diameter, creating 2.5 foot deep hole. Soil is clay below 6 inches of good black stuff. Now that I have completley disturbed the soil, is it sufficient to TAMP THE HELL OUTTA IT (as hole is filled back in (4-5 inches at a time), or do I need to let it set for days, weeks, months? Thank you pros for all sharing your experience and suggestions.