Description: This layer provides the linework for all flowing non-tidal waters PCBs assessments from the Combined 2020-2022 Integrated Report. Assessment information includes all assessments captured within Maryland's Combined 2020-2022 Integrated Reportand are generally displayed according to Categories: impaired and require a TMDL (Category 5), impaired and have a TMDL approved by the Environmental Protection Agency (EPA) (Category 4a), impaired but have exemptions from needing a TMDL (Categories 4b-4c), insufficient data is available to determine if water is meeting all standards (Category 3), are meeting some standards (Category 2), and waters that are meeting all standards (Category 1).
Copyright Text: The Maryland Department of the Environment (MDE) acknowledges the U.S. Geological Survey (USGS) which created the National Hydrography Dataset (NHD). The NHD serves as the stream linework for this file and was used to geospatially describe Maryland's water quality assessments for a variety of pollutants. The Maryland Department of the Environment linked the Integrated Report assessment information to the NHD and then preserved this pollutant-specific layer.
Description: This layer provides the polygonal areas for all impoundments in the state of Maryland for PCBs assessments from the Combined 2020-2022 Integrated Report. Assessment information includes all assessments captured within Maryland's Combined 2020-2022 Integrated Report and are generally displayed according to Categories: impaired and require a TMDL (Category 5), impaired and have a TMDL approved by the Environmental Protection Agency (EPA) (Category 4a), impaired but have exemptions from needing a TMDL (Categories 4b-4c), insufficient data is available to determine if water is meeting all standards (Category 3), are meeting some standards (Category 2), and waters that are meeting all standards (Category 1).
Copyright Text: The Maryland Department of the Environment (MDE) acknowledges the U.S. Geological Survey (USGS) which created the National Hydrography Dataset (NHD). The NHD serves as the derivedpolygonal areas for this file and was used to geospatially describe most of Maryland's impoundments; however, MDE had to manually create the boundaries for some impoundments due to the inaccuracies within the NHD. The Maryland Department of the Environment linked the Integrated Report assessment information to the NHD and then preserved this pollutant-specific layer.
Description: This layer provides the polygonal area representing unique scales in the Patapsco River and Seneca Creek for PCBs assessments from the Combined 2020-2022 Integrated Report. Assessment information includes all assessments captured within Maryland's Combined 2020-2022 Integrated Report and are generally displayed according to Categories: impaired and require a TMDL (Category 5), impaired and have a TMDL approved by the Environmental Protection Agency (EPA) (Category 4a), impaired but have exemptions from needing a TMDL (Categories 4b-4c), insufficient data is available to determine if water is meeting all standards (Category 3), are meeting some standards (Category 2), and waters that are meeting all standards (Category 1).
Copyright Text: The Maryland Department of the Environment (MDE) acknowledges the U.S. Geological Survey (USGS) which created the National Hydrography Dataset (NHD). The NHD was used for the polygonal areas of the coastal bays and oceans used to geospatially describe Maryland's water quality assessments for a variety of pollutants. MDE also acknowledges the Chesapeake Bay Foundation as their tidal bay segmentation file that was used to represent the polygonal areas of the Chesapeake Bay. These files were then merged with NHD and linked with the IR assessment information.
Description: Polygon feature class of watersheds with EPA approved PCBs (Polychlorinated Biphenyls) TMDLs. The watershed polygons do not include any upstream drainage areas (i.e., "Upstream LAs" - both inside and outside of Maryland). They only include the watershed areas where applicable WLAs apply.
Copyright Text: Maryland Department of the Environment - Science Services Administration, TMDL Development Program
Description: Polygon feature class of watersheds with EPA approved PCBs (Polychlorinated Biphenyls) TMDLs. The watershed polygons do not include any upstream drainage areas (i.e., "Upstream LAs" - both inside and outside of Maryland). They only include the watershed areas where applicable WLAs apply.
Copyright Text: Maryland Department of the Environment - Science Services Administration, TMDL Development Program
Description: Polygon feature class of watersheds with EPA approved PCBs (Polychlorinated Biphenyls) TMDLs. The watershed polygons do not include any upstream drainage areas (i.e., "Upstream LAs" - both inside and outside of Maryland). They only include the watershed areas where applicable WLAs apply.
Copyright Text: Maryland Department of the Environment - Science Services Administration, TMDL Development Program