Landslide movements triggered an accidental release of approximately 1800 barrels of gasoline at the headwaters of a fresh-water creek ocated in southeastern Montana during the summer of 1997. Wetlands impacts included soils and sediments, surface water, aquatic biological populations and riparian vegetation. Initial impacts were observed up to seven creek miles downstream from the release point, with the majority of the impacts located within the first creek mile. Factors that contributed to the extent and magnitude of the impacts included creek morphology, evaporation and diffusion of the liquid gasoline, and distance from the release.
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