Which of the following is a method of controlling stormwater quality?

Oil-water separators are specifically designed to manage stormwater quality by removing oils and other hydrocarbons from water before it is discharged into the environment. These separators operate by taking advantage of the difference in density between oil and water, allowing the oil to float to the surface where it can be collected and removed. This is crucial in preventing pollution of waterways that could result from stormwater runoff contaminated with oil, grease, and other harmful substances. Employing oil-water separators as part of a comprehensive stormwater management plan helps to protect aquatic ecosystems and ensure compliance with environmental regulations.

The other choices do not serve to improve stormwater quality. Increased truck traffic can exacerbate road wear and increase the potential for spills or leaks of hazardous materials. Open burning of waste releases harmful pollutants into the atmosphere and does not address stormwater management; instead, it poses further risks to environmental quality. Unregulated chemical use can lead to contamination of runoff, further degrading stormwater quality and causing harm to the environment and public health. Thus, oil-water separators stand out as a proactive and effective method for controlling stormwater quality.