Martin Marietta Materials, Inc-Cavanaugh Quarry Stormwater Outfall, Black Rock, Arkansas

MARTIN MARIETTA MATERIALS, INC-CAVANAUGH QUARRY is a stormwater outfall located at 113 Lawrence CR 208 in Black Rock, Lawrence County, Arkansas. This facility handles stormwater discharge from a quarry operation, classified under NAICS 212312 (Crushed and Broken Limestone Mining and Quarrying). As a stormwater outfall, it is subject to the US EPA's NPDES MS4 permit framework, which regulates discharges from industrial activities to protect water quality. The facility operates under the Clean Water Act, 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, silt fences, and other erosion control measures to manage runoff from the mining site. This outfall contributes to local water management in the Black Rock area, which is part of the Mississippi River watershed. Proper stormwater management at quarries is critical to prevent sedimentation and pollutant discharge into nearby streams. The facility's operational status indicates ongoing compliance with regulatory requirements to minimize environmental impact.

The facility is located in Lawrence County, Arkansas, within the Mississippi River watershed. Quarry operations can generate sediment-laden runoff that may impact local water bodies if not properly managed. The region's climate, with seasonal rainfall, increases the risk of erosion and discharge of pollutants. Regulatory oversight under the Clean Water Act requires implementation of stormwater controls to protect aquatic habitats and downstream water quality.