During construction, the contractor left a $1-$foot$-$thick layer of "mucky" material behind the wall before beginning backfilling. What is the factor of safety for sliding and overturning $($eccentricity$)$ based on the $"$as$-$built" condition.

What would the factor of safety have been if the contractor had constructed the wall correctly and used the $30-$degree material for the full wall backfill depth?

${}_{\text{c}\text{o}\text{n}\text{c}\text{r}\text{e}\text{t}\text{e}}=150pcf$

$=j0$ ueyres

$=24$ degrees