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How-to-form-concrete-retaining-walls, how to form concrete walls. concrete is one of the cleanest and most versatile types of wall material available. whether you need a wall as a property marker, a support structure, or to hold back soil or water, you can make one by building.... How to build a retaining wall start to finish san francisco bay area ... all access 510-701-4400 - duration: 4:39. all access construction 100,508 views