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9 and are believed to warrant further study. These topics in the specifications and commentaries and used in the ex- range from identification of methods for quantifying the ample problems were developed as the specifications, com- amount of cohesion that can be counted on during design mentaries, and example problems were being completed. to methods for describing the liquefaction strength of soils This work occurred after the completion of work described in located beneath embankments. Volume 1. · Chapter 11--References lists the references used during the Project. · Specifications and Commentaries summarize the recom- mended specifications and commentaries after revisions to This report also includes a number of appendices with sup- address (1) the NCHRP Oversight Panel's comments on porting documentation for the work presented in Chapters 2 drafts of the specifications and commentaries and (2) mod- through 9. ifications made by the Project Team after completing ex- ample problems. Some topics such as slope stability did not currently have an independent section or subsection within 1.3.2 Volume 2--Recommended the AASHTO LRFD Bridge Design Specifications, but rather Specifications, Commentaries, were scattered within the various sections. The approach and Example Problems for including the work developed during the NCHRP 12-70 This volume includes recommended specifications, com- Project became, therefore, more of a challenge. mentaries, and example problems as summarized below. The · Example Problems show the steps necessary to complete a background for some, but not all, of the methods described seismic design following the methods proposed for this in Volume 2 is included in Volume 1. Some methods outlined Project.