Shannon & Wilson Featured in Tunneling & Underground Construction Magazine

Tunneling & Underground Construction Magazine's recent issue features an article co-authored by Shannon & Wilson’s Peggy Ganse and Ingrid Sandberg.


The article “Long-distance annulus backfilling of a rehabilitated sewer tunnel” details annular space grouting for the Colsman Tunnel Rehabilitation Project. Peggy and Ingrid, both of our Denver office, were a part of the design-build team rehabilitating this 1.5-mile long sanitary sewer for the Southgate Sanitation District.  

Peggy and Ingrid also virtually presented on this project on March 29, 2021 at the 2021 No-Dig Show (presentation MA-T3-03).   

The article can be found on page 29 of Tunneling & Underground Construction’s December issue

Back to the News

Seattle Website Design