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110 AASHTO American Association of State Highway and Transportation Officials BMPs Best management practices BSM Bioretention soil media CEC Cation-exchange capacity CWA Clean Water Act DOT Department of Transportation ESA Endangered Species Act ET Evapotranspiration FHWA Federal Highway Administration GW Groundwater HRM Highway Runoff Manual (Washington State DOT) HSG Hydrologic Soil Group IWS Internal water storage LID Low Impact Development MCL Maximum Contaminant Level MEP Maximum extent practicable MS4 Municipal Separate Storm Sewer System NEPA National Environmental Policy Act NPDES Clean Water Act National Pollutant Discharge Elimination System NRCS Natural Resources Conservation Service O&M Operations and maintenance PAH Polyaromatic hydrocarbon ROW Right of way SDWA Safe Drinking Water Act SPU Seattle Public Utilities SSA Sole source aquifer TAPE Program Technology Assessment ProtocolâEcology program TSS Total suspended soils TMDLs Total maximum daily loads WLC Whole lifecycle costs WSDOT Washington State DOT Acronyms