The study, Pollution from Land Use Activities Reference Group (PLUARG
), concluded that the Great Lakes were being polluted from land drainage sources, especially from land areas of intensive agricultural and urban use.
PAH levels greater than 10 times the maximum dose used here are reportedly common for harbor waters, and levels of copper up to 2.5 [[micro]gram]/ml have been detected in heavily utilized environments (Hyland and Scheider, 1976; Pluarg
International Joint Commission, 1978; Waldhauer et al., 1978).
In the mid 1970s, the federal and provincial governments carried out intensive agricultural nonpoint source pollution studies under the Pollution from Land Use Activities Reference Group (PLUARG
) (Agriculture Canada 1978; Spires and Miller 1978), and in the mid 1980s the federal and provincial governments jointly sponsored the Soil and Water Environmental Enhancement Program (SWEEP) (Beak Consultants Ltd, 1991) which attempted to mitigate the transport of agricultural phosphorus to surface waters.