According to EPA general sequencing, when should perimeter controls be installed?

Perimeter controls play a critical role in erosion and sediment control during construction projects. They are designed to effectively manage stormwater runoff and prevent sediment from leaving the construction site. The correct timing for installing these controls is before any land disturbance occurs.

Installing perimeter controls in advance ensures that they are in place to intercept potential runoff and sediment transport as soon as land is disturbed. This proactive measure is essential for protecting water quality and complying with regulatory requirements. Proper sequencing helps to minimize the risk of erosion and sediment discharge into nearby water bodies.

Other timing options, such as after land disturbance or when construction is mostly completed, do not offer the same level of protection. If perimeter controls are installed after disturbances begin, there is a higher likelihood of sediment escaping the site, leading to potential environmental harm and increased remediation costs. Similarly, waiting until the project is nearing completion undermines the effectiveness of these controls during critical phases of construction. Correctly timing the installation of perimeter controls is a fundamental principle of best management practices in erosion and sediment control.