A rigid $($immovable$)$ basement wall is shown in the figure below. The wall is backfilled with very silty sand without being compacted. Drainage pipes were installed at the base of the wall. Since the wall is rigid, the backfill soil will be under at$-$rest conditions. $($a$)$ Calculate and sketch the distribution of lateral effective stress, pore water pressure, and total lateral stress. $($b$)$ Based on the results in part a calculate the magnitude, orientation, and location of the total resultant force acting on the wall per foot of wall $($out of the page$).$ Please show all work to get a magnitude of $4,140$ lb per foot of wall for a thumbs up