AASHTO R 21-96 (2019) PDF Download

AASHTO R 21-96 (2019) is a standard practice that aims to provide guidance for drillers who may unexpectedly encounter suspected hazardous materials during subsurface investigations. The main objective of this practice is to ensure the safety of the drillers by providing them with the necessary training and precautions to minimize the risks associated with encountering hazardous materials.

The standard emphasizes the importance of educating drillers about the potential hazards they may face and how to identify suspected hazardous materials. It also outlines specific precautions that should be taken to prevent contamination and protect the drillers from exposure to these materials. Additionally, the practice establishes a procedure that drillers should follow if they do encounter suspected hazardous materials, ensuring a systematic and safe response to such situations.