Environmental

A Montana property owner near the Clark Fork River should be aware that the Clark Fork is part of the nation's largest Superfund cleanup due to:

AAgricultural irrigation runoff only
BOver a century of copper mining and smelting upstream that deposited heavy metals throughout the river system✓ Correct
CFederal dam construction that disturbed natural sediments
DIndustrial logging that increased sedimentation

Explanation

The Clark Fork River in Montana is part of one of the nation's largest Superfund sites, with heavy metal contamination (copper, arsenic, zinc) from over a century of mining and smelting operations in the Butte-Anaconda area.

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