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EPA deletes residential areas in north Denver from Superfund list

Milestone at Vasquez Boulevard/ Interstate 70 Superfund site reflects completion of residential cleanups for lead and arsenic

09/23/2019
Contact Information: 
Lisa McClain-Vanderpool (mcclain-vanderpool.lisa@epa.gov)
303-312-6077

DENVER – On September 20th, the U.S. Environmental Protection Agency (EPA) finalized a partial deletion of the Vasquez Boulevard/Interstate 70 (VB/I-70) Superfund site in Denver, Colorado from the National Priorities List (NPL) of the nation’s most contaminated sites.  EPA and the Colorado Department of Public Health and Environment have determined that all required cleanup activities are complete in the area proposed for deletion. 

“The deletion of this area from the Superfund list represents the culmination of two decades of efforts to sample, clean up and restore residential yards affected by lead and arsenic contamination in north Denver,” said EPA Regional Administrator Gregory Sopkin. “We share this residential cleanup achievement with our partners at the State of Colorado, the City of Denver and the local community.”

Under the Trump administration, EPA’s Superfund program has reemerged as a priority to fulfill and strengthen the agency’s core mission of protecting human health and the environment. In  fiscal year 2018, EPA deleted all or part of 22 sites from the Superfund’s NPL, the largest number of deletions in one year since FY 2005 and a significant increase over the past few years.

EPA is finalizing the deletion of the residential area of the VB/I-70 Superfund site, also called Operable Unit 1, based on a determination that no further action is needed to protect human health and the environment. EPA received public comments on the proposed deletion from February 6th to April 8th 2019 and prepared a responsiveness summary to those comments, which is available online at www.regulations.gov (Docket # EPA-HQ-SFUND-1999-0010) or at the Valdez-Perry Branch Library, 4690 Vine Street, Denver, Colo.

The area will continue to be subject to regular EPA review for protectiveness. EPA will continue to address contamination concerns at remaining portions of the VB/I-70 site, which includes the locations of two former smelters. EPA proposed the deletion of Operable Unit 1 earlier this year and concluded a public comment period in March.

The VB/I-70 Superfund site includes four square miles in north Denver, including the Cole, Clayton, Swansea/Elyria, southwest Globeville and northern Curtis Park neighborhoods. EPA placed the site on the NPL in 1999 due to metals contamination, mainly lead and arsenic, associated with historic smelter operations in the area. In 2003, EPA selected a remedy for residential properties that included extensive soil sampling, soil removal, and a community health program. In completing that work, EPA has sampled more than 4,500 residential yards and cleaned up more than 800.  

Historically, the affected north-Denver neighborhoods were a major smelting center for the Rocky Mountain West. Two smelting plants—Omaha & Grant and Argo—operated at the site for varying lengths of time, beginning as early as the 1870s, refining gold, silver, copper, lead and zinc. As a result, heavy metals were deposited in area soils at levels that, in some cases, posed a health risk to residents. Groundwater impacted at the former smelter locations is currently being addressed as Operable Units 2 and 3 of the VB/I-70 Superfund site. 

For more information visit: www.epa.gov/superfund/vb-i70