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Philip (PJ) Benenati posted an update in the group Green Streets 15 years, 9 months ago
Bioretention is a technique that can be used in nearly any environment, including brownfields, as a water quality control. This may be getting too technical for your project, but depending on the amount of on-site contamination, I would recommend that you wrap all of your stormwater BMPs with an impermeable membrane to help control the spread of the contamination.