If no major failure occurs in Pebble operations, the EPA still worries negative impacts on fish resulting from habitat loss and modification within and beyond the area of mining activities could eliminate or block streams, reduce streamflow, remote from 2,512 to 4,286 acres of wetlands, reduce the quality of downstream habitat, reduce good food resources, increase summer water temperature and decrease winter water temperature, and inhibit salmon movement at road crossings.
Potential mining operation failures discussed in the assessment including tailings dam rupture, failure of the concentrate pipeline, water collection and treatment failures, and road and culvert failures.
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