AASHTO updates subsurface investigations guide

The American Association of State Highway and Transportation Officials recently published Manual on Subsurface Investigations, 2^nd Edition, which supersedes the first edition issued in 1988.

This manual describes the elements, considerations, investigation tools and techniques, and reporting requirements for geotechnical subsurface investigations for transportation facilities.

This second edition features updates addressing advancements in geophysical, “in situ,” and laboratory testing; reliability-based design as codified by the AASHTO LRFD Bridge Design Specifications, 9^th Edition; and project delivery methods. Those updates are a reference for planning, executing, and using subsurface investigations and geotechnical characterizations in order to design, construct, maintain, and manage assets of transportation facilities.

The manual is available to purchase as a PDF download, in either single-user, five-user, or 10-user formats. To purchase a copy, visit the online AASHTO Store or click here to link directly to the publication’s webpage. Information courtesy of AASHTO.