California Department of Transportation


Geotechnical Manual

The Geotechnical Manual documents the Department’s standards of practice for geotechnical investigations, design, and reporting.  Geotechnical Services staff and consultants performing work on behalf of the Department must adhere to the requirements in the Geotechnical Manual. Business processes formally included in this Manual have been moved to the Offices of Geotechnical Design - Quality Management Plan, located on the GS Quality Management System intranet page.

Introduction   June 2012
  March 2018
  June 2017
  May 2013
  January 2006
Geotechnical Investigations   July 2017
  March 2012
Soil and Rock Logging, Classification, and Presentation Manual   2010
Standard Plan Designs   November 2010
Soil Correlations   March 2014
ARS Online   January 2013
Liquefaction Evaluation   December 2014
Fault Rupture   January 2017
Conventional Retaining Walls   April 2016
Mechanically Stabilized Embankments (Caltrans Pre-Designed)   June 2017
Soil Nail Walls   June 2017
Standard Plan Overhead and Changeable Message Signs   October 2014
Driven Pile Foundations   June 2017
CIDH Pile Foundations   June 2017
Design Data Documentation and Geotechnical Evaluation of Anomalous CIDH Concrete Piles   December 2014
Sound Walls   July 2010
Embankments   December 2014
Rock Cut Slope Design   June 2013
Rockfall   July 2014
Ground Improvement   October 2014
Geosynthetics   June 2013
Forms and Templates    

A discussion forum titled Geotechnical Manual has been placed on the GS Discussion Board for staff to post their questions or comments.