Dulles International Airport, Alexandria, VA
As part of the D2 Expansion Program, the Metropolitan Washington Airports Authority is designing an Automated People Mover (APM) System to replace its present "mobile lounge" surface transportation system, which includes over ten miles of APM, tug, baggage conveyor, utility, and walkback tunnels and a vehicle maintenance facility.

The Design Team includes three tunnels design firms managed by the prime designer, HNTB Corporation, with Brierley Associates serving as Geotechncial Discipline Manager, with responsibilities such as overall discipline management including planning and execution of subsurface investigations, Geotechnical Data Report (GDR) and Geotechnical Baseline Report (GBR) preparation, geotechnical design for three of four tunnel design packages and geotechnical subcontract administration.

Combined Sewer Overflow Program, Rochester, NY
The project began with a system-wide evaluation of subsurface conditions prior to final location of tunnels, involving the drilling and logging of 35,000 linear ft of core in less than six months. Dr. Brierley served as officer-in-charge for the work, by providing general geotechnical consultation services and assistance with design of the 22 miles of combined sewer overflow tunnels in Rochester, New York.

Berthoud Highway Tunnel, Berthoud, CO
Services included feasibility evaluation, design services for a 4-mile twin-bore highway tunnel under the Continental Divide, geologic mapping, Environmental Impact Statement preparation, ventilation analysis, operation and maintenance requirements study, portal roadway design, and preparation of cost estimates and schedule.

Scajaquada Tunnel, Buffalo, NY
Provided geotechnical engineering services including subsurface explorations, laboratory testing, detailed geologic mapping, and making recommendations for temporary support and permanent structures. The project consisted of 28,000 linear feet of 7.5-foot inside diameter TBM-bored sewer tunnel in limestone and shale formations, with the tunnel invert ranging from 40 to 70 feet below ground surface and from 15 to 60 feet below top of rock.