What should be the brick masonry steps in foundation for construction of boundary wall? The depth of foundation is 3 ft.

If we haven't a geologic study of the sites we brick wall for back fill part till solid ground, determined bond type,deep, water proffing, material to use,ciment quality, we make a decision about the bettet solution to solv problem with :sand pile, stonecolumn, injection cimentitious ... 

3ft x1ft x 1ft  in solid ground

1- Brick wall for back fill part till ground level with thickness25 cm.

2- water proofing material on the both sides of back fill wall and over it.

3- the brick wall with determined bond tybe