Question

7. As part of an ongoing monitoring program, you are testing a sample of water from the Chattahoochee River north of Atlanta. Your 10' final dilution (undiluted) plate has 56 Escherichia coli colonies on it. One milliliter was pipetted onto the plate. The EPA safety standards for recreational freshwater state that the water cannot contain more than 235 E. coli per 100 ml. Is the river safe to swim or kayak in? Why or why not?

Answer 1

7. As part of an ongoing monitoring program, you are testing a sample of water from the Chattahoochee River north of Atlanta. Your 10° final dilution (undiluted) plate has 56 Escherichia coli colonies on it. One onto the plate. The EPA safety standards for recreational freshwater state that the milliliter was pipetted V kayak in? Why water cannot contain more than 235 E. coli per 100 mL. Is the river safe to swim or or why not? The recommended safety range of E.coli is, 235/100mL or 2.35 E.colimL Since 235/100 2.35 Given that the river contains 56 E.coli/mL. Means, the river contains more E.coli than the recommended safety range, so it is not safer to swim