What constitutes a minor modification to the On-Site SWPPP?

A minor modification to the On-Site Storm Water Pollution Prevention Plan (SWPPP) involves field modifications that do not require formal approval from DHEC (Department of Health and Environmental Control). This typically includes adjustments that are made during the implementation of the SWPPP based on site conditions, but do not alter the fundamental intent or compliance requirements of the plan.

For instance, these types of adjustments might include changing the location of a Best Management Practice (BMP) due to unforeseen site constraints or making small tweaks to the construction schedule. The key aspect here is that these modifications are considered minor, so they can be made swiftly to address practical site needs without the need for regulatory approval, thereby ensuring that the project continues to comply with environmental standards while minimizing delays.

On the other hand, modifications that require DHEC approval involve significant changes in the SWPPP, such as alterations that may affect the overall compliance with state regulations or the effectiveness of sediment control measures. Additionally, the addition of large structures or any changes to the BMP list could imply a substantial alteration to the SWPPP, necessitating a review and approval process to ensure that these changes align with environmental regulations.