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Broomfield monitors uranium finds at Chimney Hollow reservoir; no deliveries until assessments complete
Summary
City and County of Broomfield staff said naturally occurring uranium was detected behind a cofferdam at Chimney Hollow reservoir during construction; Northern Water and participants are testing and evaluating treatment and delivery options and the Colorado Department of Public Health and Environment standards apply.
City and County of Broomfield staff told council that sampling near Chimney Hollow reservoir — the new Windy Gap storage facility where Broomfield holds roughly 29.4% of the storage allocation — has shown detectable concentrations of naturally occurring uranium in water retained behind a cofferdam.
"As Northern Water has published… minimized uranium was detected in water samples that was behind the cofferdam," Ken Rutt, director of water utilities, told council. He said the apparent source is natural leaching from granite used in nearby quarrying and noted that such mineralization occurs in various Colorado…
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