Ten Mile Station Stormwater Outfall, Eight Mile, Alabama | Regulatory Context and Environmental Role

Ten Mile Station is a stormwater outfall located at 5200 Whigham Road in Eight Mile, Alabama, within Mobile County. As a stormwater outfall, it functions as a discharge point for stormwater runoff from the surrounding urban and industrial catchment areas. The facility is operational and falls under the jurisdiction of the US EPA's National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) program, which regulates stormwater discharges to protect water quality. In Alabama, stormwater management is primarily governed by the Alabama Department of Environmental Management (ADEM), which implements the NPDES MS4 program. Phase I and Phase II MS4 permits require operators to develop stormwater management programs that include public education, illicit discharge detection, construction site runoff control, and pollution prevention. Ten Mile Station, as part of the Mobile urban area, likely operates under a Phase II MS4 permit, given the population size and regulatory framework. The environmental significance of Ten Mile Station lies in its role in managing stormwater runoff from the Eight Mile area, which can carry pollutants such as sediment, nutrients, heavy metals, and pathogens into receiving waters. Proper operation and maintenance of this outfall are critical to minimizing impacts on local water bodies, including the Mobile River and Mobile Bay, which are ecologically important estuarine systems. Compliance with NPDES permit conditions helps ensure that stormwater discharges do not impair water quality or harm aquatic life.

Eight Mile, Alabama, is located in the Mobile Bay watershed, a region characterized by a humid subtropical climate with high annual rainfall, leading to significant stormwater runoff. The area includes a mix of urban, industrial, and residential land uses, which can contribute pollutants such as sediment, oil and grease, and nutrients to stormwater. Mobile Bay is an ecologically sensitive estuary that supports diverse aquatic species and is subject to water quality impairments from urban runoff. Effective stormwater management at outfalls like Ten Mile Station is essential to reduce pollutant loads and protect the bay's health.