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       Gateway Geotechnical (Gateway), formed in July, 2006, provides technically and personally focused geotechnical and construction services.  In 2017, Gateway became a Division of THD Design Group, Inc. which also provides surveying and civil engineering services.  Our key staff brings to you and your projects a highly qualified team, with a combined nearly 100 years of experience in the local geotechnical and construction community. 
       Gateway is located in Chesterfield Valley, with our own in-house soils and materials testing laboratory. We maintain current professional engineering registrations in Missouri, Illinois, and Iowa.