Geotechnical Testing

A Geotechnical Evaluation, commonly referred to as a “Soils Report,” should always be included as part of a comprehensive due diligence assessment associated with the transfer or development of any given site intended for residential or commercial structures.

Soils Testing

The Texas Board of Professional Engineers interpretation of the International Residential Code section on foundations (specifically IRC 2012 Sec. R401.4 Soils Tests) is that soil testing should be included on all residential foundations.  Besides being required by building codes such as in the IRC and by design manuals such as the Post-Tensioning Institute’s 3rd edition design manual, a quality geotechnical evaluation of a project site can save considerable time and expense and provides the design team with subsurface information and soil properties during the design and planning stages.  The data obtained from a laboratory analysis of the soil samples establishes critical design parameters used by the design Engineer.  All geotechnical reports should contain certain basic essential information, including:

  • Summary of all subsurface exploration data, including a soil profile, exploration logs, laboratory or in-situ test results, and ground water information;
  • Interpretation and analysis of the subsurface data;
  • Specific soil parameters for use by the Design Engineer;
  • Discussion of site conditions and possible solutions of anticipated problems;
  • Recommended geotechnical special provisions.
Field and laboratory technicians working for Whitworth Engineering are trained and certified in the correct ASTM testing procedures as required for the sampling and testing of soils.

Site Specific Soils Testing

A site specific soils report is generally required for all commercial projects.  It is also required when building a residential structure on an isolated site where no supporting data is available from Soil Reports taken in the immediate vicinity.  Typically two test holes are bored on each lot with several soil samples taken from each hole.

Multi-site / Subdivision Soil Testing

A multi-site report is a relatively low-cost/low-impact approach to reducing potential liability associated with unidentified or unfavorable site conditions  Soil samples are taken from a number of lots within a development then tested in a laboratory to determine the soil properties within that development.  The geotechnical report should contain the same basic essential information referenced above that will apply to all lots within a subdivision.

Soil Density / Compaction Testing

Soil Density testing is required wherever soils have been used to “fill” an area where extra material is needed to build up or enhance the natural grade. If you have ever dug a hole and found that you could not put all the soil that came out of the hole back into it you will realize the need to compact loose soil as it is laid in place.
Soils Test Process
  • Submit Signed Contract
  • Submit Down Payment (Must be received for work to begin)
  • We Submit Digtess (A 2 day notice to the utility companies is required to ensure underground utility lines aren’t in the area we will be drilling)
  • Drilling & Soils Testing Completed
  • Submit Final Payment
  • Finished Report Provided

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