... in meltwater and carried into soil, ground water, and surface water. The impact of the spring pulse of pollutants requires study. Environmental and human health impacts from tar sands related ... clearcutting, burning, excavation and stockpiling of peat, and wetland dewatering associated with the expanding tar sands operations may account for the increasing methylmercury levels observed in ... was located in an area of tar sands deposits unaffected by mining. The ‘developed’ site was located in an area of tar sands mining. Relative to the reference site, EROD activity at the natural...