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Engineers report groundwater pilot cut contaminants near Fort Hall Mine landfill; recommend follow-up injections and $300,000 phase‑2 work
Summary
CDM Smith told the county board that an in‑situ slurry injection pilot reduced concentrations of chlorinated ethanes near the Fort Hall Mine landfill and recommended converting pilot boreholes to injection wells and performing additional injections and monitoring this fiscal year.
CDM Smith briefed the Bannock County Board of Commissioners on June 12 about results from a pilot in situ remediation test at the Fort Hall Mine landfill and recommended a phase‑2 campaign of follow-up injections and monitoring to sustain contaminant degradation.
Adrienne Mead and Tamsen Macbeth of CDM Smith described a pilot in which crews injected a slurry containing zero‑valent iron (ZVI) and carbon into low‑permeability sediments at the foot of Fort Hall Canyon to establish a permeable reactive barrier. Macbeth summarized the contaminant context: “Primary contaminants of concern are chlorinated ethanes,” and the firm reported it had injected roughly “380,000 pounds of 0 valent iron and carbon” during the…
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