Bridge Design and Load Requirements: The bridge must be designed to meet or exceed all current NC standards for pedestrian bridges. Design must accommodate a minimum live loads. Design must comply with all relevant ADA (Americans with Disabilities Act) standards, including ramp slopes, railing heights, and walking surface requirements. Retaining Wall Requirements: The wall design must be based on a geotechnical report (to be provided or generated by the Vendor) and signed by a Licensed Professional Engineer (P.E.). Wall height and length must be sufficient to retain the backfill needed for proper bridge approach/exit grades. Materials (e.g., modular block, cast-in-place concrete) must be structurally sound and approved by SCC for aesthetics. Design must include adequate drainage provisions behind the wall (e.g., clean-out ports, gravel backfill, perforated pipe) to prevent hydrostatic pressure buildup. Poured Concrete Walkway Specifications: The walkway must meet ADA standards for width (minimum 60 inches recommended) and cross-slope. Concrete shall be a minimum of 4,000 psi strength, air-entrained, and installed over a properly compacted sub-base. The finish must be a non-slip broom finish. Any contraction and expansion joints must be installed per ACI (American Concrete Institute) standards.
