TILLERY BORROW PIT Stormwater Outfall, McCalla, Alabama | United States

TILLERY BORROW PIT is a stormwater outfall located in McCalla, Jefferson County, Alabama, United States. The facility manages stormwater runoff from industrial mining activities, classified under NAICS codes 212321 (Construction Sand and Gravel Mining) and 212399 (Other Nonmetallic Mineral Mining and Quarrying). As a stormwater outfall, it discharges collected runoff into local waterways, operating under the regulatory framework of the Clean Water Act and US EPA NPDES MS4 permits. The facility's technical specifications are not detailed in available records, but typical stormwater outfalls in this sector include sediment basins, retention ponds, and erosion control measures to manage runoff from mining sites. In Alabama, stormwater discharges from industrial activities are regulated under the NPDES General Permit for Stormwater Discharges from Industrial Activities (ALG990000). The facility likely employs best management practices (BMPs) to reduce pollutant loads, such as silt fences, sediment traps, and vegetative buffers. Environmental significance lies in its role managing runoff from mining operations, which can carry sediment, heavy metals, and other pollutants. Discharge to nearby water bodies must comply with water quality standards to protect aquatic ecosystems. The facility's location in Jefferson County places it within the Black Warrior River watershed, a region with diverse aquatic habitats. Proper stormwater management helps mitigate erosion, flooding, and contamination risks associated with industrial land use.

The facility is situated in the Black Warrior River watershed in Alabama, a region characterized by rolling hills and forested areas. Mining operations in this area can generate sediment-laden runoff that may impact local streams and rivers. Stormwater outfalls like TILLERY BORROW PIT must comply with NPDES permit limits to prevent degradation of water quality. The surrounding ecosystem supports aquatic life and recreational uses, making effective stormwater management critical for environmental health.