What type of information is typically contained in preplans?

Preplans are essential documents that are used by emergency services, particularly fire departments, to gather and store crucial information about specific buildings or sites that may require special attention during an emergency response. The correct option focuses on providing detailed information about buildings, including their floor plans, usage, construction type, and any hazardous materials storage. This comprehensive information allows responders to understand the layout of the building and the potential risks they might face, facilitating a more efficient and effective response during emergencies.

In contrast, while contact information for emergency personnel and lists of evacuation routes are important, they do not encompass the breadth of specifics that preplans aim to document. The content of preplans is more focused on the physical and potentially dangerous aspects of a site rather than personnel or general escape routes. Therefore, option B accurately describes the nature of information included in preplans.