Superfund Site Profile
The East Helena site is located in East Helena, in Lewis and Clark County, Montana. The site includes a lead smelter that operated from 1888 until 2001, the town of East Helena, several residential subdivisions and surrounding rural agricultural lands. For more than 100 years, lead and zinc smelting operations deposited heavy metals, arsenic and other hazardous chemicals into the soil, surface water and groundwater of the Helena Valley. The sources of this contamination included the smelter stack, fugitive emissions from plant operations, process ponds and direct surface water discharges. Historically, the mode of transport for the contaminants was air and surface water. Cleanup at the site is ongoing.
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A draft 2015–2016 Interim Measures Work Plan (IM Plan) for the East Helena Site is available on the Montana Environmental Trust Group (METG) website.
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EPA is currently conducting the fourth five-year review at the site. Five-year reviews are conducted to determine how the remedy is working and if the remedy remains protective of human health and the environment.