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18 Positive 96 hours negative 96 Negative alkalinity aluminium sulphate amount of lime BACTERIA PER C.C. bacterial count C.C. IN CALUMET CALUMET RIVER DISTRICT canal cent chemical Chlorine cities coli contact beds cost discharge disinfection dissolved oxygen District of Chicago East Chicago effluent Engineering feet per second floc flow Gary Steel Plant Grains per Gallon Grand Calumet Grand Calumet River Hammond Glue hours positive inch intake iron sulphate Laboratory Number Lake Calumet Lake Michigan Water lake water Little Calumet methyl orange Million as CaCO million gallons Nitrites NUMBER OF BACTERIA Oxygen Consumed pollution present problem pumping purification plant putrescible Sampling Point sand filters Sanitary District sedimentation Septic tank settling tank sewage Sewage Disposal Sewage Purification Sewer slow sand slow sand filter sludge sodium South Chicago Sowing Diluted sprinkling filters starch sumptive suspended matter TABLE tests tion Total solids Treatment of Lake turbidity water supply Waukegan wind