25 May 2005
Change 1, 22 February 2006
Change 2, 4 December 2006
Geotechnical Investigations and Report.
Each Facility Engineering Command maintains record files pertaining to the
geotechnical aspects of previously constructed projects. Architecture and engineering
firms preparing, planning or designing documents are encouraged to use this resource
to research existing conditions or past design approaches for facilities, structures, or
pavements. Viewing or discussion of the files' contents is possible by contacting the
Government. For Design-Build contracts, any relevant geotechnical or pavement
information that is available will be furnished in the Design-Build RFP.
Foundation and Soils Investigation.
For specific requirements for foundation and soils investigation, see IBC 2003, Chapter
18, UFC 3-220-01N, and UFC 3-220-03FA. In using the IBC, the terms "owner,"
"applicant," and "building official" are synonymous with the "Government." In addition,
the following requirements apply:
Investigations and evaluations (including soil borings, test pits, ground penetrating radar
shall be in accordance with ASTM standards to the fullest practical extent. The
classification and investigation of the soil shall be made by a registered design
professional. Where ASTM methods are not applicable, procedures and apparatus
used shall be in accordance with generally accepted engineering practice. Global
Positioning System (GPS) coordinates shall be taken at each soil boring, coring, or test
pit location and stated on the boring/coring/test pit logs. Unless directed or approved
otherwise by the Government, the following requirements apply. The soil borings and
standard penetration tests shall be made in accordance with ASTM D 1586. The ASTM
D 1586 procedure shall be modified to make continuous standard penetration and
sampling tests for the initial 12 feet of the boring. If drilling techniques are used that
prevent the measurement of the water table, install at least two piezometers per drilling
site to more accurately measure the depth to the water table. Piezometers are required
for storm water pond investigations. Piezometers are not required if there is good
evidence that the water table is not within the depth of the borings or zone of influence
for the foundation or structure. During drilling, all soils shall be visually classified in
accordance with ASTM D 2488. If evidence is discovered indicating soil or groundwater
contamination, this should be reported immediately to the Government. If soft cohesive
materials are discovered in the near surface soils, they should be sampled with a thin
wall tube for laboratory testing. Undisturbed sampling shall be performed at the
discretion of the Geotechnical Engineer responsible for performing the investigation.