d. A concrete retaining wall will retain (hold back) soil and water so that workers can repair an underground pipe. The soil and water apply a horizontal force of 15,000 pounds applied at a point 4.5 feet up from the base of the wall footing, as represented by the red vector in the drawing. 1.00- 1.00 8.00 1.00 10.00 -5.00- RETAINING WALL ALL DIMENSIONS IN FEET Will the retaining wall protect the workers from the force of the soil and water? Justify your answer. How would you revise the design of the retaining wall to provide a larger factor of safety?