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.
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Level Three changes to the industrial stormwater general permit
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