Popular engineering forum site, including a very active section for “Soil/Groundwater environmental engineering”.
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Geotechnical Engineering Directory
They claim to be the most comprehensive Geotechnical Engineering directory on the web. Around since 1999. Visit Geotechnical Engineering Directory
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Grokking GeoStudio
Grokking GeoStudio is an unofficial blog by a programmer on the GeoStudio team. Visit Grokking GeoStudio
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Geophysical Survey Systems
Geophysical Survey Systems, Inc. (GSSI), is the world leader in the development and manufacture of commercial ground penetrating radar (GPR) systems and electromagnetic induction instruments (EM). Visit Geophysical Survey Systems