Water Quality in the Western Lake Michigan Drainages, Wisconsin and Michigan, 1992-95
Forested land use was related to high concentrations of arsenic and selenium in streambed sediment (Scudder and others, 1997). The igneous/metamorphic bedrock and sand and gravel surficial deposits that are found in most of the forested areas may be a source for these elements in the study area. Ontario Ministry of Environment and Energy values (Persaud and others, 1993) are shown for the Lowest Effect Level (LEL) and Severe Effect Level (SEL). Sediment effect criteria from Ingersoll and others (1996) for Effects Range Low (ERL) and Effects Range Median (ERM) are for arsenic only.