What is an iterative approach and is it only applicable to Attachment 4?
The iterative approach is a process of implementing BMPs as outlined in your Storm Water Management Program (SWMP), evaluating the effectiveness of those BMPs, and modifying your SWMP accordingly (by changing the implementation of the BMP or replacing it with another BMP) in order to continuously achieve the discharge standard of MEP. The RWL contained in Attachment 4 of the Small MS4 Permit specifically require that the iterative process also be utilized if your storm water discharge is found to be causing or contributing to a violation of water quality standards. This requirement acknowledges that addressing receiving water impacts will be addressed in the same process as implemented through your storm water program but in a more aggressive, focused manner.
