What document contains the operating procedures for water and fuel systems?

The correct choice is the SOP (Standard Operating Procedures) manual, as it specifically contains detailed instructions and protocols for operating and maintaining water and fuel systems. This document outlines the steps required to ensure that systems are managed safely and effectively, and includes guidelines on best practices, safety measures, troubleshooting, and emergency procedures.

While the equipment manual may provide specific technical details about individual components of the water and fuel systems, it does not typically contain the comprehensive operating procedures that the SOP manual offers. The maintenance log is used to record service history and maintenance activities rather than providing procedural guidance. Similarly, a regulatory compliance document focuses on compliance with laws and regulations rather than the operational aspects of the systems themselves. Therefore, the SOP manual is the most appropriate document for understanding how to operate water and fuel systems effectively.