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What range of the Contamination Factor corresponds to the ‘considerable contamination’ level of degree of contamination?

What range of the Contamination Factor corresponds to the ‘considerable contamination’ level of degree of contamination? Correct Answer CF between 3 and 6

According to Hakanson, the considerable contamination degree is a range of values between 3 and 6. CF value less than 1 corresponds to low contamination; CF between 1 and 3 corresponds to moderate contamination; CF greater than 6 corresponds to very high contamination.

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