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What are the water quality requirements for additions to sites with existing impervious areas?

April 26, 2017additions areas existing Impervious requirements sites

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What are the water quality requirements for additions to sites with existing impervious areas?

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Similarly to the way impervious areas are treated for peak control, water quality treatment for additions will only be required on the impervious areas that are added. Treatment of existing impervious areas that are to remain is not required unless runoff from existing area goes to a BMP.