A full service engineering firm with much experience in tunneling.
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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
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Shaft Drillers International
Shaft Drillers International delivers both ground modification solutions and mechanically excavated shafts. Experience is the hallmark of SDI. Each project benefits from more than 30 years of dedication and service in the fields of ground […]
Project Related
Attempting to Remove the Pipe Blocking Bertha
The Seattle Tunnel Partners JV is attempting to remove the rest of an 8 inch diameter steel well casing that has been blocking the Bertha tunnel boring machine since December 8, 2013. The upper 55 […]