Overview
Three Mile Drydock & Repair LLC operates a stormwater outfall in Mobile, Alabama, managing runoff from an industrial ship repair facility. The outfall discharges into local waterways under US EPA NPDES MS4 permit regulations.
Three Mile Drydock & Repair LLC is an industrial stormwater outfall located at 100 Industrial Canal Road East in Mobile, Alabama. The facility manages stormwater runoff from a drydock and ship repair operation, discharging into the Mobile River system. As a Phase II MS4 permittee, it operates under the Clean Water Act and Alabama Department of Environmental Management (ADEM) regulations. The outfall handles stormwater from an industrial catchment, which may include potential contaminants such as heavy metals, oils, and sediments typical of ship repair activities. The facility's discharge point is subject to NPDES permit requirements, including stormwater pollution prevention plans (SWPPP) and best management practices (BMPs) to control runoff quality. Mobile's subtropical climate with high annual rainfall (over 60 inches) necessitates robust stormwater management. This outfall contributes to the broader stormwater infrastructure of Mobile, a major Gulf Coast port city. Proper management is critical to protect the Mobile River and Mobile Bay ecosystems, which support fisheries, recreation, and commerce. The facility's compliance with regulatory standards helps mitigate impacts on downstream water quality and aquatic habitats.
Environmental context
The outfall discharges into the Mobile River system, which flows into Mobile Bay, an ecologically significant estuary. The region's industrial and port activities, combined with urban runoff from Mobile, create potential stressors on water quality. The facility's industrial catchment may introduce pollutants such as metals, hydrocarbons, and sediments, requiring effective BMPs to protect downstream habitats. Alabama's stormwater regulations under the NPDES MS4 program aim to control these discharges to meet water quality standards.
Frequently asked questions
The facility is located at 100 Industrial Canal Road East in Mobile, Alabama, United States.
It operates a stormwater outfall that manages runoff from a drydock and ship repair facility, discharging into the Mobile River system under an NPDES MS4 permit.
Stormwater outfalls in Alabama are regulated under the US EPA NPDES MS4 program, with Phase II permits for small municipalities and industrial facilities. The Alabama Department of Environmental Management (ADEM) oversees compliance.
Industrial stormwater outfalls, especially from ship repair, may contain heavy metals, oils, grease, sediments, and other contaminants. Facilities must implement stormwater pollution prevention plans (SWPPP) and best management practices (BMPs) to control these pollutants.
The Clean Water Act requires NPDES permits for point source discharges, including stormwater outfalls. Permittees must comply with effluent limits, monitoring, and reporting to protect water quality.
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