Boulder Valley working on sewer gas mitigation at Casey over spring break

Rich Colaiano, with Advanced Sewer and Drain, slides a fiber optic camera in to a drain clean out to check the drain system underneath Casey Middle School in Boulder. (Mark Leffingwell / Staff Photographer)

Boulder Valley staff members and outside consultants are rebalancing the air handling system for better air circulation and installing extended vents at Casey Middle School over spring break.

Extending roof vent pipes farther will allow the district to remove carbon filters so the building can "breathe" better, district officials said. The district also is repeating several previous tests, including a pressurized smoke test to check for leaks in pipes and sending video cameras down the septic lines.

There have been complaints about the presence of low levels of hydrogen sulfide gas, signaled by an intermittent stink of rotten eggs, since the school was rebuilt in 2009-10 for $33 million.

"Significant efforts have been made to identify the source," said Superintendent Bruce Messinger.

More recently, parents and teachers have come forward with health concerns they believe are caused by exposure to hydrogen sulfide and demanded that the district do more to address the issue.

If you go

What: Casey Middle School community meeting

When: 6 to 7:30 p.m. April 2

Where: Casey Middle, 1301 High St., Boulder

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Boulder Valley working on sewer gas mitigation at Casey over spring break