1717488Amend006dwg_CIVIL.pdf

These are construction design drawings and technical specifications for stormwater management facilities at a federal installation, specifically showing site plans, grading details, erosion control measures, and structural specifications for multiple storm structures and pipes.

The documents detail comprehensive stormwater infrastructure improvements including gutter catch basins, flared end sections, bioretention areas, sediment chambers, overflow basin details (SD42 and SD30 catch basin modifications), and rock pipe inlet protection structures. Technical specifications cover temporary and permanent erosion and sediment control measures, ground stabilization requirements using temporary seeding and permanent vegetative cover, and detailed construction sequencing. Key design elements include storm structure data tables identifying 50+ structures with specific invert elevations and outlet dimensions; storm pipe data specifying 30+ pipe segments with diameters ranging from 6 to 137 inches and slopes between 0.25% and 1.71%; roof drain specifications; and maintenance access requirements with 10-foot minimum access routes. Construction specifications mandate sediment fence installation, storm drain inlet protection using filter fabric, temporary inlet protection using rock and stone, stockpile management with maximum 30-foot diameter limits, tree preservation and protection measures, and dewatering/sediment management protocols. The drawings reference North Carolina seeding requirements for temporary and permanent ground cover, specify detailed inspection and maintenance schedules for sediment control measures, and include erosion control construction sequencing coordinated with the North Carolina Department of Environmental Quality. Project scope encompasses site entrance controls, environmental compliance monitoring, segment-specific construction details, and comprehensive post-construction maintenance and inspection requirements.