What is a common source of stormwater pollutants that Walmart aims to control?

Oil and chemicals from parking lot surfaces are a common source of stormwater pollutants that Walmart aims to control because these substances are often introduced into the environment during rainfall events. When it rains, water washes over these surfaces, picking up contaminants such as oil drippings, gasoline, and other chemicals associated with vehicle use. This runoff can carry these pollutants into nearby water bodies, affecting water quality and aquatic ecosystems.

Parked vehicles contribute significantly to this type of pollution, especially in large commercial areas like Walmart where expansive parking lots are common. By implementing stormwater management practices aimed at capturing and treating this runoff, Walmart can help mitigate the harmful effects of these pollutants, ensuring compliance with environmental regulations and promoting overall sustainability in their operations.

Other potential sources of stormwater pollutants, while significant, do not match the direct relationship to a commercial parking environment as closely as oil and chemicals do. For instance, stormwater from residential areas may contain a variety of pollutants but is less controllable by Walmart. Wastewater from employee restrooms is handled through sewer systems and does not directly enter stormwater. Dust from construction sites, while it can pollute stormwater, is not as consistently present as the oils and chemicals found in parking lots and is usually addressed through separate construction and