This Geotechnical Technical Guidance Manual (TGM) provides
technical guidance for geotechnical work performed by the Federal
Lands Highway (FLH). It provides guidance for understanding and
applying policies, standards and criteria in recognition of the
need to manage financial and public safety risk and accomplish the
missions of FHWA, FLH and partner agencies. Specific topics include
geotechnical reconnaissance, site and subsurface investigation,
analysis and design, reporting, PS&E involvement, construction
support, performance monitoring, emergency response and consultant
roles. The guidance in this TGM supports the policies, standards
and standard practices presented in Chapter 6 of the Project
Development and Design Manual (PDDM). Additionally, the TGM
provides guidance for activities where standards and standard
practices do not exist and it provides access to and guidance for
the use of new technologies. Chapter 6 of the PDDM is the source
for general direction on "what" should be performed, whereas
guidance herein provides recommendations and options for "how" to
perform these tasks. Like the PDDM, the TGM is intended to be used
primarily as a web-based electronic reference document. Not all
guidance is presented directly in the manual. When published
sources present guidance that satisfies the requirements of FLH, or
does so with only minor modification required, the TGM provides
citations and links to those sources. If necessary, commentary on
the application of these sources is provided here. This is done to
keep the TGM small and more manageable, and also to allow easy and
timely incorporation of new guidance as it is developed and
published by FLH, FHWA and others. Technical guidance references
cited and linked in this manual are classified as either "Primary,"
or "Secondary." Primary sources either present preferred guidance
on how to accomplish a task or, when equal guidance is available
through many sources, the Primary source is most widely available.
"Secondary" sources are additional documents that are often relied
on for FLH work; they present guidance to augment the Primary
source. The PDDM presents work requirements through the official
statement of policy and standards so it is an essential companion
manual to the TGM. The TGM does not stand alone; policies and
standards are repeated here only as necessary to offer guidance on
their application. If discrepancy in the statement of policy or
standards exists, the PDDM has precedence. Division-level documents
also exist within FLH to provide guidance on unique technical
practices or procedures at FLH Divisions; where these exist they
should be followed for work within that Division. Also, although
the organization of each of the Divisions is similar, there are
differences. For this reason, the project delivery process and how
the Geotechnical Discipline works within that process is described
largely at the Division level.
General
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