Description
The Upper Mobile Bay Beneficial‑Use Wetland Creation Site Phase 1 requires the construction of a 100‑acre containment system and associated infrastructure to create a new wetland cell in Mobile Bay. The contractor must build a northern earthen dike, segmented breakwater/revetment structures on the remaining sides, install weir boxes for water‑level control, and place a large sand berm using either local borrow sand, off‑site Sunflower DMPA sand, or geotextile tubes filled with sand. Environmental protections include turbidity‑control curtains, daily monitoring, and strict avoidance zones for submerged aquatic vegetation and cultural resources. The work also entails hydrographic and magnetometer surveys, a marine navigation plan, and extensive signage and lighting per US Coast Guard regulations.
• Construct a +6 ft crest northern earthen dike and rock‑riprap breakwaters (ALDOT Class 5 armor, Class 2 under‑layer).
• Place up to ~1.15 million CY of sand (local borrow) or use free Sunflower DMPA sand; optional geotextile‑tube installation.
• Provide weir box, HDPE out‑fall pipe, and full environmental/turbidity‑control measures, including surveys and marine navigation plan.
• Complete all work within 350 calendar days after Notice to Proceed, meeting strict tolerances and cultural‑resource protocols.