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Hammond mayor: August rain overwhelmed sanitary system; Columbia Avenue basin discharged into Grand Calumet River
Summary
Mayor (name not specified) told the Hammond City Council that an Aug. 17–18 storm dumped 6–8 inches of rain, pushed the wastewater plant to about 160 million gallons per day (nearly three times design), and caused the Columbia Avenue retention basin to discharge over 100 million gallons of partially treated water into the Grand Calumet River.
Mayor (name not specified) told the Hammond City Council that a heavy rain event between Aug. 17 and Aug. 18 flooded large parts of the city, overwhelming the Hammond Sanitary District and causing a combined-sewer overflow (CSO) into the Grand Calumet River.
The mayor said the storm dropped between "6 and 8 inches of rain" across Hammond and that the wastewater treatment plant peaked at about 160,000,000 gallons per day — nearly three times its design capacity of about 68,000,000 gallons per day. He said the Columbia Avenue Retention Basin filled and "discharged over 100,000,000 gallons of partially treated water into the Grand Calumet River," which he described as a CSO event the city must report to the U.S. Environmental Protection Agency and the Indiana Department of Environmental…
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