Project Highlights

Aldea’s vast experience in managing large tunneling and heavy civil engineering projects enables us to provide unrivaled support to our clients and confidence in our work.

Our work spans throughout the United States and extends around the world. We are equipped with the best minds in the industry providing leadership and direction in all facets of tunnel engineering project management.

Crenshaw/LAX Transit Corridor: Simcoe Street Train Station Tunnel

Crenshaw/Los Angeles, CA
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 design, means and methods – design criteria
  • Development of work sequences
  • Detailed design of SOE for station boxes
  • Design of entryways and access hatches
  • Design of utility supports and straps
  • Headwalls and break-in and out design for TBM excavation
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Westside Purple Line Extension, Phase 2: Rail Transit Line

Beverly Hills (Los Angeles), CA

Role: Tunnel Design Lead; Design Build for Contractor

Client: STV Inc.
Construction Cost: $6.3 Billion (3 phases)

 

Technology: EPBM
Geology: Soft Ground

 

Dimensions: 18.8 ft ID (5.7 m)
Length: 2.2 mi (3.5 im)
Depth: 50-70 ft (15-21 m)

 

Project Elements:

  • Twin-bore tunnel in dense urban environment
  • Complex fault zone crossings
  • Multiple segmental lining designs, including regular, fault crossing special, cross passage special
  • Break-in and out of stations
  • Seismic connection between station and tunnel
  • Waterproofing design of connection and special cross passage
  • Innovative, cost-effective, practical solutions and designs driven by client’s needs.
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Innovative, cost-effective, practical solutions and designs driven by Client’s needs.

Atlanta Airport Plane Train Turnback Tunnel

Atlanta, GA
Role: Owner’s Engineer for tunnel and Access Shaft; Progressive Design Build

Client: Ricondo
Construction Cost: $140 Million

 

Technology: SEM, Drill and Blast
Geology: Soil/Rock

 

Dimensions: 22 ft (6.7 m); Tunnel bifurcation up to 48 ft (14.5 m) span

Length: 780 ft (237 m)
Depth: 36-55 ft (11-17 m)

 

Project Elements: 

  • (x1) Access Shaft – 36 ft ID x 56 ft deep
  • Tunnel connecting main terminal and intercontinental hotel
  • Geotecnical data review
  • 30% design drawings
  • Preparation for bidding
  • Review and approval of Contractor’s design
  • Construction management services for owner
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Alaskan Way Viaduct Replacement Program

Seattle, WA
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
  • Cost and budget verification panel (3 people) prior to bidding project
  • Expert Review Panel – annual report to state legislature and Governor’s office
    • Cost and risk profile of project
    • Status with respect to budget and schedule
    • Outlook with respect to cost, schedule and outstanding risks
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Westside Purple Line Extension, Phase 3: Rail Transit Line

Westwood (Los Angeles), CA
Role: Tunnel Design Lead; Design Build for Contractor

Client: STV Inc.
Construction Cost: $460 Million

 

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 supply infrastructure
  • Undercrossing Westfield Shopping Mall
  • Multiple segmental lining designs, including regular, fault crossing special, cross passage special
  • Break-in and out of stations
  • Seismic connection between station and tunnel
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Montreal Airport Station, Transit Terminus for REM

Montreal, QB
Role: Tunnel, Shaft and Station cavern Design – Precast Concrete Liners, Connections and Complex Fault Crossings

Client: Aeroports de Montreal

Construction Costs: $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 tunnel design
  • Track bifurcation caverns design
  • Cost estimating
  • Risk management and risk workshops
  • Quantitative risk analysis of budget and schedule

Olentangy Augmentation Relief Sewer (OARS)

Columbus, OH
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, and starter tunnel
  • Groundwater inflow control by rock grouting
  • TBM data analysis
  • Risk management during construction
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Rebecca Trunk Wastewater Main

Oakville, ON

Role: Microtunnel Designer & Construction Inspection/Administration

Client: Cole Engineering

Construction Costs: $43 Million

 

Technology: Drill and Blast

Geology: Rock

 

Length: 2,476 m & 1,575 m

Diameter: 1,200mm (48 in) & 1,350mm (54 in)

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 crossing of environmentally sensitive creek 
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