This from Tim Olk:

Chicago Fire Dept Level 1 Haz-Mat 111th And Spaulding For The Natural Gas Leak

Firefighter takes gas reading in sewer

Tim Olk photo

Firefighter takes gas reading in sewer

Tim Olk photo

Firefighters at gas leak

Tim Olk photo

Chicago FD Haz Mat 5-1-1

Tim Olk photo

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