Where can DOTD Designations regarding sampling Portland cement concrete and its components be found?

The correct choice points to the Materials Sampling Manual as the documentation where DOTD Designations regarding sampling Portland cement concrete and its components are specified. This manual is specifically focused on the procedures and standards for sampling and testing various materials used in construction, including concrete. It provides detailed guidelines on how to properly collect samples, ensuring the integrity and quality of the materials used in construction projects.

The other options, while they may contain important information relevant to construction and quality, are not primarily focused on sampling procedures. The Quality Control Manual typically encompasses broader quality assurance and control processes rather than specific sampling techniques. The Construction Standards Manual lays out general guidelines and specifications for construction practices but does not delve into the specifics of material sampling. Safety Guidelines Manual focuses on health and safety practices during construction activities rather than sampling protocols. Thus, the Materials Sampling Manual is the most relevant source for finding DOTD Designations related to concrete and its components.