Standard Recommended Practice for
Conducting Geotechnical
Subsurface Investigations
AASHTO Designation: R 13-03 (2007)1
ASTM Designation: D 420-98 (2003)
INTRODUCTION
Investigation and identification of subsurface materials and conducting subsurface investigations involve complex techniques that may be accomplished by many different procedures and may be variously interpreted.
These studies are frequently site specific and are influenced by geological and geographical settings; by the purpose of the investigation;
by the design requirements for the project proposed; and by the background, training, and experience of the investigator.
This recommended practice for soil, rock, and groundwater investigation based on standard procedures will provide a more consistent, uniform, and rational methodology for site evaluations.
An acceptable and consistent investigation, sampling, testing, and evaluation program will determine subsurface site conditions and thereby provide the
information needed to bring about safer and more cost-effective transportation facilities.
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