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Turbidity 1-25-250 NTUs

Photo: Dave Jenkins, CPESC The sample on the left is just under 1 NTU , the middle is 25 NTUs, and the one on the right is 250 NTUs. In Washington state, the Construction Storm Water General NPDES Permit lists benchmarks that construction discharges must meet. These are: 0-25 NTUs everything...