Where can you find regulations for sampling and record storage?

The correct choice is based on where you can find regulations pertaining to sampling and record storage, which are crucial for wastewater management and compliance with federal guidelines. The Code of Federal Regulations (CFR) is divided into titles that cover various subjects, with each title further divided into parts that detail specific regulations.

Choice B, 41 CFR 503, specifically addresses regulations related to the management, storage, and sampling of records. This part pertains to federal health and safety compliance, which includes various environmental protections necessary for regulatory practices.

Focusing on the other titles, while they also fall under the CFR, they address different areas. Title 40 CFR generally focuses on environmental protection and may contain some relevant information; however, it is more specific to pollutants and standards rather than the records management aspect. Titles 30 and 50 CFR relate to mining and wildlife, respectively, which are not pertinent to the sampling and record storage in the context of wastewater management.

Thus, 41 CFR 503 is the appropriate reference for regulations about sampling and record storage, making it the correct response.