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Aurora outlines remediation plan and grants for Highway 30 landfill contamination
Summary
City staff described contamination at the closed Highway 30 landfill and remediation options including regrading, permeable reactive barriers, soil vapor extraction with combustor, and possible excavation; state grants of about $11.4 million will fund initial work toward an estimated full cost of roughly $35.5 million.
Aurora City staff on Sept. 10 briefed the Planning and Economic Development Policy Committee on contamination and remediation planning for the Highway 30 landfill, a closed municipal landfill owned by the city.
"This landfill is in Ward 2," said Jeffrey Moore, manager of the city's energy and environment division. He said the landfill closed in 1975 and that state regulator CDPHE (Colorado Department of Public Health and Environment) issued a compliance advisory in 2016 and a final compliance order and consent in late 2019 requiring cleanup of groundwater and some soils.
Moore said the investigation phase is complete: contractors drilled more than 100 monitoring points and soil vapor wells to delineate two former waste trenches. He described contaminants identified by state guidance, including 1,4-dioxane (an industrial solvent) concentrated in the west trench and trichloroethylene (TCE) concentrated in the east trench. The trenches are relatively shallow — Moore said the deepest parts are on the order of 25 to 30 feet…
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