The available points for each part are given in $($yellow highlighting$).$

You have been tasked with evaluating the site described in the attached geotechnical report $($see Canvas

assignmentfor a link$).$

Assume the following site conditions:

a$)$ Therewill be a basement requiring excavation down to approximately $10$ ft belowthe

existing finished grade. See soil boringB$-1$ throughB$-6.$

b$)$ The worst soil layer type defines the excavation parameters, SW$.$

c$)$ SW $($well$-$graded sand$)$ is not very cohesive and is predominately granular.

Answer all the following questions using complete sentence answers:

$1.$ OSHA Soil Classification Type:

$1\mathrm{.}1.$ What soil classification would OSHA categorize this type as$?(2$ points$)$ Justify your answer $(2$

points$)$in a complete sentence.$(1$ points$)$

$2.$ OSHA Required lay back:

$2\mathrm{.}1.$ What is the allowable slope for the OSHA classification you determined to be appropriate? $(2$

points$)$Justify your answer $(2$ points$)$in a complete sentence.$(1$ points$).$

$[$Note: The Geotechnical report $($page $12)$ does reference a slope for over excavations of shallow $(<5$ ft$)$

foundations. Do not mistake this slope with the one for OSHA$-$required laybacks.$]$

$3.$ Shoring Requirements:

$3\mathrm{.}1.$ Does this excavation need to be shored? Include the OSHA depth limit in your answer. $[$Note: page $2\mathrm{.}9$

of your textbook has a typo. Use my lecture content or go directly to the source document$($OSHA

Section$1926\mathrm{.}652).](2$ points$)$Justify your answer $(2$ points$)$in a complete sentence.$(1$ points$)$