A bridge, shown in Figure $1,$ is being designed to span over an existing interstate highway as part of an interchange project. This will require grading the existing ground surface to El$.0$ ft$,$ constructing a gravity retaining wall, placing an approach fill to bring vehicles from the existing grade to the deck of a new bridge. Deep foundations are likely going to be needed to support the bridge, but the depth to an appropriate bearing stratum is unknown. A borrow source for the approach fill is located nearby, but the soil has not been characterized.

What are two "geotechnical issues" for the proposed construction shown on the attached plan and profile? Complete Table $1$ below noting the analyses, parameters and lab tests needed to solve each issue.

In one sentence for each issue, explain why the issues you identified are important.

For each boring, shown on the attached profile: $1)$ what kind of samples, and $2)$ where you would take the samples needed to solve the geotechnical issues noted above. The two soundings are soil borings placed at the proposed deep foundation locations. Use the symbols given on the profile for your sample types.