Level Three Changes to the Industrial Stormwater General Permit

Ecology issued its final modified industrial stormwater general permit last week, which will become effective on July 1, 2012.  Among the changes in the modified permit is a requirement that permittees submit and obtain Ecology approval on engineering report and plans for any Level 3 corrective action that requires the site-specific design or sizing of stormwater structures, equipment, or processes.  This has the potential to significantly drive-up costs for those permittees that are obligated to install treatment best management practices.  A copy of the final modified permit and a summary of the changes can be found here: permit, summary of changes.