The Environmental Protection Agency released guidance Sept. 25 to inform urban planners, engineers and developers how they can use bioswales, rain gardens and porous pavements to capture stormwater runoff at brownfield sites without mobilizing pollutants in the soil and contaminating groundwater. The guidance, “Implementing Stormwater Infiltration Practices at Vacant Parcels and Brownfield Sites,” addresses six key questions to determine whether infiltration-which allows accumulated stormwater runoff to percolate into the subsoil-or other management approaches are appropriate for a specific brownfield property. The guidance, prepared by the EPA Office of Water and the Office of Solid Waste and Emergency Response, said stormwater management planning should be done alongside site investigation, state approvals, selection of cleanup approaches and design and engineering of site improvements. The guidance is available here.