An excavation 9 m deep is supported by a vertical wall as shown below. The wall is embedded 2.0 m below the base of the excavation. Calculate the total active force and its line of action on the vertical wall shown below. The wall retains sand of unit weight 17 kN/m for which 35. The surface of the sand is horizontal, and the water table is at a level 6 m below the surface of the sand. = q=100 kN/m 424 9m 2m 2241