Parent Layer: CONTAMINANTS IN WATER & SEDIMENT

Name: Sediment Quality: Exceedances in Provincial/Federal Guidelines

Display Field: StationName

Type: Feature Layer

Geometry Type: esriGeometryPoint

Description: This data was derived as part of the Overall Assessment of the State of Nearshore Waters. Contaminants in bottom sediment have the potential to be released into the water column and enter the food chain, which can lead to toxic and reproductive effects in species, as well as bioaccumulation in aquatic life. Sediment quality is assessed using the severity of median contaminant levels in sediment for four categories (metals, organochlorine pesticides, PAHs and PCBs) at Provincial long-term monitoring stationsin each Regional Unit.Median results for PCBs, metals and PAHs at each index station were calculated, and compared to Provincial and Federal guidelines, for data inthe most recent sampling years of the MECP Great Lakes Nearshore Index Stations. In Lakes Erie and Ontario, these include2007, 2010, 2014 & 2016 and in Lake Superior, 2011.Provincial guidelines establish three levels of effect:No Effect Level (NEL)indicates concentrations of a chemical in sediment that has no effect on fish or sediment-dwelling organisms; at this level, negligible transfer of chemicals through the food chain and no effect on water quality is expected. Sediment meeting the NEL are considered clean.Lowest Effect Level (LEL)indicates a level of contamination that can be tolerated by the majority of sediment-dwelling organisms; sediment that meet the LEL are considered clean to marginally polluted.Severe Effect Level (SEL)indicates a level of contamination that is expected to be detrimental to the majority of sediment-dwelling organisms; sediment exceeding the SEL are considered to be heavily contaminated.Federally, the Canadian Council of Ministers of the Environment (CCME) guidelines refer to a Threshold Effect Level (TEL)that represents the concentration below which adverse biological effects are expected to rarely occur and a Probable Effect Level (PEL)above which adverse effects are expected to occur frequently. The PEL is recommended as an additional sediment quality assessment tool that can be useful for identifying sediments in which adverse biological effects are more likely to occur (CCME, 2001). The Index Station locations are from the Ontario Ministry of Environment, Conservation and Parks Great Lakes Nearshore Index Station Network.Low Stress: PCBs < No Effect Level, Organochlorine pesticides & PAHs < Lowest Effect Levels, Metals < Probable or Severe Effect Levels; Moderate Stress: PCBs > No Effect Level OR Organochlorine pesticides & PAHs > Lowest Effect Levels OR Metals > Probable Effect Levels but < Severe Effect Levels; High Stress: Any contaminant > Severe Effect Level

Copyright Text: Environment and Climate Change Canada (ECCC) - Strategic Policy Branch - RDGO Ontario Ministry of Environment, Conservation and Parks Great Lakes Nearshore Index Station Network: https://data.ontario.ca/dataset/sediment-chemistry-great-lakes-nearshore-areas

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Extent:

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YMin: -711171.1267793439
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YMax: 18929.49659857154
Spatial Reference: 3978  (3978)

Drawing Info:

Renderer:
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Field 1: SedimentSummary
Field 2: null
Field 3: null
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UniqueValueInfos:
• Value: Contaminants not at levels of concern
  Label: Contaminants not at levels of concern
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• Value: PCBs > No Effect Level
  Label: PCBs > No Effect Level
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• Value: PCBs > No Effect Level; Organochlorine Pesticides > Probable Effect Level
  Label: PCBs > No Effect Level; Organochlorine Pesticides > Probable Effect Level
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• Value: PCBs > No Effect Level; PAH > Probable Effect Level
  Label: PCBs > No Effect Level; PAH > Probable Effect Level
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• Value: Metals > Severe Effect Level
  Label: Metals > Severe Effect Level
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Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• RegUnit_ID ( type: esriFieldTypeString, alias: Regional Unit ID, length: 255 )
• StationNum ( type: esriFieldTypeDouble, alias: Station Number )
• StationName ( type: esriFieldTypeString, alias: Station Name, length: 255 )
• PCBs ( type: esriFieldTypeString, alias: PCBs, length: 200 )
• Metals ( type: esriFieldTypeString, alias: Metals, length: 200 )
• PAHs ( type: esriFieldTypeString, alias: PAHs, length: 200 )
• Latitude ( type: esriFieldTypeDouble, alias: Latitude )
• Longitude ( type: esriFieldTypeDouble, alias: Longitude )
• SedimentSummary ( type: esriFieldTypeString, alias: Sediment Quality, length: 200 )
• OrganoPesticides ( type: esriFieldTypeString, alias: Organochlorine Pesticides, length: 200 )
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