1748122Amend0006dwg_CIVIL_030326.pdf

This is a set of construction design plans and technical specifications for a stormwater management and erosion control project at a federal facility. The documents consist of detailed site plans, cross-sections, construction notes, and storm structure data sheets for implementing stormwater management facilities, erosion and sediment control measures, and related infrastructure.

The project includes construction of multiple storm structures (numbered SD1-SD49) with specified dimensions and outlet configurations, pipe installations with various diameters and slopes, and temporary and permanent erosion control measures. Key construction specifications address stormwater management facility design with sediment chambers and filter systems, rock check dams and outlet stabilization structures, temporary sediment fencing and construction entrances, tree preservation and protection protocols, topsoil stockpiling with designated areas not exceeding 30 feet in diameter, and maintenance access routes. The plans specify requirements for filter fabric installations, perforated pipe installations in filter sand, cleanout provisions for sediment chambers, and flared outlet structures with stabilization. Erosion control sequencing requirements include coordination with North Carolina Department of Environmental Quality, pre-construction conferences, stabilization of disturbed areas within 7 days, and ongoing maintenance inspections at least weekly and after rainfall events. The project encompasses permanent ground cover seeding using North Carolina-approved seed mixes and temporary ground cover options. All materials must be sourced from permitted sites, and the contractor must conduct daily inspections of temporary erosion control measures and remove accumulated sediment within specified timeframes throughout construction.