Role: Construction Management, Technical Support Client: City of Columbus Construction Cost: $375 Million Technology: EPBM/Slurry TBM Geology:  Karst limestone Diameter: 20 ft (6 m) Length: 23,000 ft (7010 m) Depth: 200 ft (50 m) Project Elements: Combined Sewer Overflow (CSO) Tunnel in urban environment Deep shafts (access and drop shafts) Slurry wall construction Drill and blast shafts, adits, […]

Role: Tunnel Design Lead; Design Build for Contractor Client: STV Inc. Construction Cost: $1.27 Billion Technology: EPBM Geology:  Soft Ground Dimensions: 20.3 ft ID (6.1 m) Length: 2.6 mi (4.2 km) Depth: 50-70 ft (15-21 m) Project Elements: Twin-bore tunnel in dense urban environment Santa Monica fault – 700 ft wide at 63⁰ Undercrossing critical highway and water […]

Role: Cost and Risk Verification Check and Expert Review Panel Member Client: Washington State DOT Construction Cost: $3.1 Billion\Technology: EPBM and Cut and Cover Geology:  Soft Ground Dimensions: 58 ft (17.6 m) Length: 9600 ft (2.9 km) Depth: 20-50 ft (6-15 m) Project Elements: Single-tube double-deck tunnel Two lane highways on each level with 50 mph design speed […]

Role: Tunnel, Shaft and Station cavern Design – Precast Concrete Liners, Connections and Complex Fault Crossings Client: Aeroports de Montreal Construction Cost: $600 Million Technology: Drill and Blast Geology: Rock Length: 815 ft (250 m) Diameter: 31 ft (9.6 m) with 79 ft (24 m) span cavern Depth: 86-142 ft (26-43 m) Project Elements: Design of cavern under terminal building Access […]

Role: Microtunnel Designer & Construction Inspection/Administration Client: Cole Engineering Construction Cost: $43 Million Technology: Drill and Blast Geology: Rock Diameter: 1,200mm (48 in) & 1,350mm (54 in) Length: 12,476 m & 1,575 m Depth: 14 m (46 ft) Project Elements: Fourteen (14) microtunneling drives Twelve (12) composite curved drives Long microtunneling drives from 180m to 626m Concrete caisson shafts Shallow […]

Role: Owner’s Engineer for tunnel and Access Shaft; Progressive Design Build Client: Ricondo Construction Cost: $140 Million Technology: CSEM, Drill and Blast Geology:  Soil/Rock Dimensions: 22 ft (6.7 m); Tunnel bifurcation up to 48 ft (14.5 m) span Length: 1780 ft (237 m) Depth: 36-55 ft (11-17 m) Project Elements: (x1) Access Shaft – 36 ft ID x […]

Role: SOE Design of Stations; Design Build for Contractor Client: Walsh-Shea Constructors Construction Cost: $1.27 Billion Technology: Cut and Cover Geology:  Soft Ground; Young and Old Alluvium Dimensions: 3 stations, each 806 x 110 ft (245 x 33 m) – 70 ft (21 m) diameter Length: 13,728 ft (4 km) Depth: 67-71 ft (20-21 m) Project Elements: Basis of […]