Complete the two problems shown below on infinite slope and $\backslash (\backslash$phi$=0\backslash )$ analyses, and submit them together with a discussion of the practical significance of these types of analyses, and the value of simple analyses that you can do $"$on the back of an envelope."

Problem $1$:

Estimate reasonable properties for the compacted silty sand, and calculate the embankment slopes that would give a factor of safety of $1\mathrm{.}25$ at locations $\backslash (\backslash$mathrm$\{$A$\},\backslash$mathrm$\{$B$\}\backslash ),$ and C $.$

Impermeable Firm Soil

Problem $2$:

An underwater excavation is planned in San Francisco Bay mud. What would be the factor of safety if it was made as shown below? Please perform your calculations using both the Swedish circle method and using a chart solution check. Is the factor of safety sensitive to the value of D$?$ What would be the factor of safety if the slope was not under water?