20211014 12554000 1.0 TRUE Toxic Contaminant Impairments NHDplus V1 catchments (inland) and state monitoring segments (tidal) that contain a full or partial overlay with state designated impairments pertaining to all Toxic Contaminant Impairments: Ammonia, Cyanide, Oil and grease, Metals other than mercury, Mercury, Pcbs, Pesticides, pH/Acidity/Caustic Conditions, Salinity/Total dissolved solids/Chlorides/Sulfates, Toxic organics, Total Toxics. Chesapeake Bay Program