How many samples are required for the BMR?
40 CFR 403.12(b)(5)(iv) states, “The User shall take a minimum of one representative sample to compile that data necessary to comply with the requirements of this paragraph.” The type of sample will depend on the nature of the pollutant as described in 40 CFR 403.12(b)(5)(iii), which states “a minimum of four (4) grab samples must be used for pH, cyanide, total phenols, oil and grease, sulfide, and volatile organics. For all other pollutants, 24-hour composite samples must be obtained through flow-proportional composite sampling techniques where feasible. The Control Authority may waive flow-proportional composite sampling for any Industrial User that demonstrates that flow-proportional sampling is infeasible. In such cases, samples may be obtained through time-proportional composite sampling techniques or through a minimum of four (4) grab samples where the User demonstrates that this will provide a representative sample of the effluent being discharged.” If the process produces a dis
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