PENAIR HANGAR AND L1 GATE RAMP-AIA Stormwater Outfall, Anchorage, Alaska

PENAIR HANGAR AND L1 GATE RAMP-AIA is a stormwater outfall located at 6100 Boeing Avenue in Anchorage, Alaska, United States. This facility serves the Ted Stevens Anchorage International Airport area, managing stormwater runoff from hangar and ramp surfaces. As a stormwater outfall, it discharges collected runoff into local waterways, operating under the regulatory framework of the US EPA NPDES MS4 permit program. The facility operates within the Anchorage Municipality, which is designated as a Phase I MS4 due to its population size. Stormwater outfalls like this one are critical components of the municipal separate storm sewer system, conveying runoff from impervious surfaces such as aircraft parking ramps and hangar roofs. The outfall likely includes basic treatment features such as oil-water separators or sediment traps to manage pollutants common in airport runoff, including deicing fluids, fuels, and heavy metals. Discharge from this outfall ultimately reaches the Cook Inlet watershed, which supports salmon runs and other sensitive aquatic species. Proper management of stormwater quality is essential to protect these water bodies from urban and industrial pollutants. The facility's operational status indicates ongoing compliance with local stormwater management requirements under the Clean Water Act.

The outfall discharges into the Cook Inlet watershed, a vital ecosystem supporting salmon, marine mammals, and migratory birds. Anchorage's cold climate and seasonal snowmelt create unique stormwater challenges, with pollutants accumulating on surfaces during winter and being released during spring thaw. The airport setting introduces potential contaminants from aircraft deicing fluids and fuel spills, requiring careful management to protect downstream water quality.