Desiree McCaslin, a Sioux City Public Works department employee, demonstrates how a hydrogen sulfide meter is used to measure the gas in the wet well at the Riverside sewage lift station on May 1, 2014. The city is continuing its struggle with sewage odors in Sioux City's Riverside neighborhood. The injection of chemicals into a sewer line has produced mixed results and some mixed opinions from people who live near the Riverside lift station. (AP Photo/The Sioux City Journal, John Quinlan)
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