HANGAR 24, LLC Stormwater Outfall, Birmingham, Alabama | Industrial Runoff Management

HANGAR 24, LLC is a stormwater outfall located at 4900 69th Street North in Birmingham, Alabama, within Jefferson County. The facility is operational and manages stormwater runoff from an industrial catchment, classified under NAICS code 488119 (Other Airport Operations). As a stormwater outfall, it discharges collected runoff into local waterways, playing a key role in flood control and water quality management in the Birmingham metropolitan area. The facility operates under the regulatory framework of the US Clean Water Act, specifically the National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) program. Birmingham is part of a Phase I MS4 area due to its population size, requiring a comprehensive stormwater management program to reduce pollutant discharges. The outfall likely serves an airport-related industrial area, with runoff potentially containing pollutants such as sediment, oil, and grease from aircraft operations and maintenance activities. Environmental significance of this outfall lies in its contribution to protecting downstream water bodies, including the Black Warrior River watershed. Proper management of stormwater from industrial facilities is critical to prevent contamination of receiving waters and to comply with Total Maximum Daily Load (TMDL) requirements for impaired streams in the region. The facility's location in an urban-industrial setting underscores the importance of best management practices for stormwater quality.

Birmingham, Alabama, experiences a humid subtropical climate with frequent thunderstorms and an average annual rainfall of about 55 inches, leading to significant stormwater runoff. The Jefferson County area includes numerous streams and rivers that drain into the Black Warrior River system, which is a vital water resource for drinking water, recreation, and aquatic habitats. Industrial stormwater outfalls like HANGAR 24, LLC must comply with NPDES permit requirements to control pollutants such as sediment, heavy metals, and hydrocarbons, which can impair water quality and harm aquatic life. The facility's discharge may affect local water bodies that are already listed as impaired under Section 303(d) of the Clean Water Act, necessitating stringent erosion and sediment control measures.