Appendix A to 40 CFR 423 is notable for enumerating how many pollutant entries?

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Multiple Choice

Appendix A to 40 CFR 423 is notable for enumerating how many pollutant entries?

Explanation:
Appendix A to 40 CFR 423 is a catalog of discrete pollutants that are subject to pretreatment requirements under the NPDES program. Each pollutant is listed as a separate entry, so the total number reflects how many pollutant entries appear in that appendix. There are 129 such pollutant entries, which is why this option is the best answer. The other choices misinterpret the appendix as counting pages, generic items, or regulations, rather than counting the individual pollutants named in the list. In practice, this list helps determine which substances require control to protect wastewater treatment systems and receiving waters.

Appendix A to 40 CFR 423 is a catalog of discrete pollutants that are subject to pretreatment requirements under the NPDES program. Each pollutant is listed as a separate entry, so the total number reflects how many pollutant entries appear in that appendix. There are 129 such pollutant entries, which is why this option is the best answer. The other choices misinterpret the appendix as counting pages, generic items, or regulations, rather than counting the individual pollutants named in the list. In practice, this list helps determine which substances require control to protect wastewater treatment systems and receiving waters.

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