Where are methods of conducting tests found?

The Testing Procedures Manual is the correct answer because it specifically outlines the methodologies for conducting various tests related to quality control in the production of construction materials such as concrete. This manual typically provides detailed instructions, protocols, and standards that need to be followed during testing to ensure consistency and accuracy.

The other manuals mentioned serve different purposes. The Quality Assurance Manual focuses more broadly on the overall quality control processes and policies, establishing the framework within which testing operates, rather than detailing specific testing methods. The Safety Procedures Manual is centered around maintaining safety standards and protocols for operations and does not include testing methodologies. Lastly, the Construction Standards Manual sets the guidelines and specifications for construction practices but also does not provide specific instructions on conducting tests. Therefore, for detailed test methodologies, the Testing Procedures Manual is the appropriate resource.