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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", "geometryType": "esriGeometryPoint", "sourceSpatialReference": { "wkid": 3978, "latestWkid": 3978 }, "copyrightText": "Environment and Climate Change Canada (ECCC) - Strategic Policy Branch - RDGO\nOntario Ministry of Environment, Conservation and Parks Great Lakes Nearshore Index Station Network: https://data.ontario.ca/dataset/sediment-chemistry-great-lakes-nearshore-areas", "parentLayer": { "id": 4, "name": "CONTAMINANTS IN WATER & SEDIMENT" }, "subLayers": [], "minScale": 0, "maxScale": 0, 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