Which of the following is NOT one of the five common classes?

• A. Perimeter controls and inlet protection
• B. Stabilization
• C. Sediment basins and traps
• D. Noise reduction and aesthetic enhancement

Answer: (D)

The concept here is recognizing which elements are actual erosion and sediment control categories versus items that don’t fit those categories. The five common classes are focused on preventing sediment from leaving the construction site—through controls at the site perimeter and inlets, keeping exposed soil stabilized, and using structures like sediment basins and traps to capture sediment-laden runoff. Noise reduction and aesthetic enhancement, while sometimes desirable on a site, does not address erosion control or sediment capture, so it isn’t one of the standard five classes. Perimeter controls and inlet protection, stabilization, and sediment basins and traps are all typical BMP categories used to manage stormwater on construction sites, making the noise/appearance option the one that doesn’t belong.