Geotechnical Services

The function of Geotechnical Services is to provide both design and operations support. The Geotechnical Design Services unit provides technical support to ADOT Project and Delivery Operations (PDO) and ADOT Districts. Geotechnical Design Services also provides support and guidance to geotechnical consultants and any geotechnical-related requests outside of these consultants for the agency. The Geotechnical Operations unit provides field investigation services such as pavement coring, test pit excavations, monitoring of inclinometers and piezometers, and other methods of field support.

ADOT Geotechnical Project Development Manual Version (GPDM) Version 4.0 (2025)

The new Geotechnical Project Development Manual (GPDM) provides requirements and guidance for the following: planning; field exploration methods and procedures...

LRFD Geotechnical Design Memorandums

Contains structural foundation (drilled shaft and spread footing) and retaining wall design guidelines and policies.

MSE Walls Pre-Approved Systems List and MSE Walls Design Support Documents

The systems listed were approved by ADOT Geotechnical Services and were previously listed on ADOT’s Approved Product List (APL). These products will remain in approved...

ADOT Preliminary Engineering and Design Manual (1989)

This manual is for information purposes only. Portions of this manual have been replaced by the ADOT Pavement Design Manual (2017)(link is external) and the ADOT...