Environmental and wildlife officials say there's been no sign of any contamination like the pollutants that leaked into the pit in the 1980s from a nearby petroleum tank farm.
Scientists say the massive fish kill at the Sparks Marina was caused by a dramatic drop in the water's oxygen content, which they say is not all that uncommon.
They believe it was triggered by a weeklong cold spurt in December when lows hovered near zero at the former gravel pit converted into a marina 15 years ago along Interstate 80 just east of Reno.
But some citizens are questioning officials' assurances the marina is safe.
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