AGGPRO SITE Stormwater Outfall, Juneau, Alaska | Industrial Stormwater Management

AGGPRO SITE is a stormwater outfall located at 5760 Concrete Way in Juneau, Alaska, within the Juneau City and Borough. The facility is operational and serves industrial activities classified under NAICS codes 324121 (Asphalt Paving Mixture and Block Manufacturing), 327320 (Ready-Mix Concrete Manufacturing), and 327991 (Cut Stone and Stone Product Manufacturing). As a stormwater outfall, it manages runoff from these industrial operations, which can contain pollutants such as sediment, oils, and heavy metals. 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) permits. Juneau is a Phase II small MS4 community, requiring stormwater management programs to reduce pollutant discharges to the maximum extent practicable. The outfall likely requires coverage under an NPDES industrial stormwater permit, with monitoring and best management practices to control runoff. Environmental significance lies in its location in Juneau, a coastal city in Southeast Alaska with high rainfall and sensitive aquatic ecosystems. Stormwater discharges from industrial sites can impact nearby water bodies, including Gastineau Channel and the Mendenhall River. Proper management of this outfall is critical to protect local water quality and support the region's salmon fisheries and marine habitats.

Juneau, Alaska, experiences a maritime climate with heavy precipitation, averaging over 90 inches of rain annually. This high rainfall volume increases stormwater runoff, which can carry pollutants from industrial sites like AGGPRO SITE into nearby water bodies. The region's aquatic ecosystems, including salmon streams and marine habitats in Gastineau Channel, are sensitive to sediment, heavy metals, and hydrocarbons commonly found in industrial stormwater. Regulatory oversight under the Clean Water Act and NPDES MS4 permits aims to mitigate these impacts through erosion control, spill prevention, and treatment measures.