DENVER (AP) — Colorado health officials are requiring more monitoring and preventive measures from Suncor Energy (USA) Inc. as it cleans up contaminated groundwater moving off its refinery in Commerce City.

Health officials say they’re concerned that a construction project at an adjacent Denver Metro Wastewater Reclamation District facility could interfere with the cleanup and expose construction workers to contamination.

Suncor has been working since November to control an underground plume of groundwater that has been leaking benzene into Sand Creek and the South Platte River.

Health officials issued a notice Wednesday requiring Suncor to develop a groundwater monitoring plan and map of the plume on the Metro District’s property. It also must submit plans for reducing refinery-related contamination moving onto district property and managing contaminated groundwater pumped out of the construction area.


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