CAPITAL QUARRIES, INC. - POWHATAN QUARRY Stormwater Outfall, Black Rock, Arkansas

CAPITAL QUARRIES, INC. - POWHATAN QUARRY is a stormwater outfall located at 4549 HWY 25 in Black Rock, Lawrence County, Arkansas. This facility handles stormwater discharge from a quarry operation, classified under NAICS codes 212312 (Crushed and Broken Limestone Mining), 212319 (Other Crushed and Broken Stone Mining), and 333120 (Construction Machinery Manufacturing). As a stormwater outfall, it is subject to the US EPA's NPDES MS4 permit program, which regulates discharges from industrial activities to protect water quality. The facility operates under the Clean Water Act framework, requiring compliance with stormwater pollution prevention plans (SWPPP) and best management practices (BMPs) to control runoff. In Arkansas, the Department of Energy and Environment - Division of Environmental Quality oversees permitting and enforcement. The quarry's stormwater system likely includes sediment basins, ditches, and erosion controls to manage runoff from mining and processing areas. This outfall discharges into local waterways in the Black Rock area, which are part of the Mississippi River watershed. Proper stormwater management is critical to prevent sedimentation and pollutant loading that could impact aquatic habitats and downstream water uses. The facility's operational status indicates ongoing compliance with regulatory requirements to minimize environmental impacts.

The quarry is located in Lawrence County, Arkansas, within the Mississippi River basin. Stormwater runoff from mining operations can carry sediment, metals, and other pollutants that may affect local streams and rivers. The area's climate includes seasonal rainfall, which increases runoff volumes and the risk of erosion. Regulatory oversight under the Clean Water Act requires the facility to implement controls to protect water quality and aquatic ecosystems.