A civil engineering firm is tasked with designing and constructing a bridge over a river to connect two urban areas. The project involves various phases, including site selection, design, environmental impact assessment, construction, and maintenance. The firm needs to consider several factors to ensure the bridge's structural integrity, safety, and functionality.

Which of the following considerations is NOT typically a primary concern in the initial stages of the project?

a$)$ Soil composition and geotechnical analysis of the riverbed.

b$)$ Traffic flow patterns and vehicular load capacity requirements.

c$)$ Environmental impact assessment and mitigation measures.

d$)$ Aesthetic design elements and architectural features.

e$)$ Availability of construction materials and procurement logistics$.$