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<p>Workers for Dixon Marine seal a plastic tube containing a sediment core sample from the bed of the lower Coeur d'Alene River on Friday. The U.S. Environmental Protection Agency is seeking to determine where along the Coeur d'Alene River that heavy metals polluted sediments are most likely to be picked up and eventually washed into Lake Coeur d'Alene.</p>

<p>Workers for Dixon Marine seal a plastic tube containing a sediment core sample from the bed of the lower Coeur d'Alene River on Friday. The U.S. Environmental Protection Agency is seeking to determine where along the Coeur d'Alene River that heavy metals polluted sediments are most likely to be picked up and eventually washed into Lake Coeur d'Alene.</p>

September 22, 2013

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Getting to the core of the issue
September 22, 2013 9 p.m.

Getting to the core of the issue

EPA studying lead mining waste in Lake Coeur d'Alene

During the past three weeks workers aboard boats extracted hundreds of sediment core samples from the bed of the lower Coeur d’Alene River, and the work continues this coming week as the federal government collects data for mapping heavy metals pollution hotspots.