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Tunnel Design
Portal No. 2 – Caldecott Fourth Bore Tunnel, [Bay Area] California

Trenchless Design
Pilot Tube Project - Cambridge, Massachusetts

Geotechnical Design
Dulles International Airport - Washington, DC

Geostructural Design
Syracuse University - Syracuse, New York

Dispute Resolution
Brierley Associates



Brierley Associates
is a privately held, national tunnel, trenchless, geotechnical, and geostructural design firm that has been “Creating Space Underground” for over a decade. Our team of over 50 professionals serves owners, contractors and attorneys. With offices in Colorado, California, Illinois, Massachusetts, New Hampshire, New York, Texas, and Wisconsin we are well positioned to serve the needs of our clients on a national level. We are committed to providing accurate and highly focused information to our clients in a timely and cost effective manner.

Brierley Associates is a proven company with diverse underground design experience. We offer our clients the efficiency and enthusiasm of a small business and a highly seasoned professional staff. As new opportunities arise, we look forward to being on your design team to Create Space Underground.