Expedia Seattle Campus

LOCATION

Seattle, Washington

DESCRIPTION

Our team was contracted to perform all sitework and utilities for the Expedia Technology Campus located along the waterfront of Seattle. The site is 43 acres in size and was a multi-phase permit project over the course of four years.

SCOPE OF WORK 

This project included multiple scopes of work which were site preparation, Advanced Master Planning (AMP) utility infrastructure (water, sanitary sewer, and storm drainage), demolition of existing foundation to build a new parking garage that tied into an existing parking garage, mass excavation and structural excavation and backfill for a new, separate parking garage, trenching and backfilling new power and communication ductbanks, installation of new city watermain and appurtenances, Street Improvements which included trenching and backfill for new electrical, re-aligning existing bike path for pedestrian traffic, and complete right-of-way roadway construction and bike path, regrading and filling the public portion of the project with cellular concrete fill, wall construction, and grading for new bike/pedestrian path, mass excavation, structural excavation and backfill of three new large office buildings. Aside from the buildings, our team performed all site grading and excavation, handling and disposal of contaminated soils, installation of all utilities and site drainage, installation of both lined and non-lined bioretention area, import and placement of all aggregates, dewatering for various scopes of work, furnish and install large cistern vault for water storage for the water feature, trenching and backfill for plumbers for large diameter piping, design-build structural earth slope, furnish and install cellular concrete fill, import of multiple blends of topsoil, erosion control, difficult landscape design contouring and landform construction, pre-loading multiple areas, and implementing a salmon-safe method for the new landscape zones utilizing Liquid Biological Amendments (known as compost tea).

PROJECT HIGHLIGHTS

• Earthwork & Grading
  • 67,400 cubic yards cut to fill
  • 20,412 cubic yards of asphalt and concrete export
  • 47,890 cubic yards of building mass excavation for buildings
  • 18,250 cubic yards of structural excavation
  • 17,500 cubic yards of structural backfill
  • 38,000 cubic yards export of clean soil
  • 1,415,080 square feet of fine grading of hardscapes and landscape areas
  • 88,900 tons of export class 2 & 3 contaminated soils
  • 2,188 cubic yards of controlled density fill (CDF)
  • 2,500 cubic yards of structural GeoFoam
  • 11,350 cubic yards of lightweight cellular concrete fill
  • 139,250 tons import of various City of Seattle Mineral Aggregates
  • 103,680 cubic yards import of various blends of topsoil & compost
  • 5,000 tons import of sand
  • 2,300 tons of Onsite Argolyte Quarry reused onsite for Owner
  • 1 EA installation of large precast panel vault
  • Preparing, brewing, and application of Salmon-Safe Liquid Biological Amendments
  • Design/Build of Landform requiring geo-grid (8,000 square feet) due to steepness of slope
  • Well-Point Dewatering Systems

• Utilities
  • 29,425 lineal feet of 4”-30” storm drain pipe
  • 3,925 lineal feet of 8-12” RJ watermain with cathodic protection
  • 28,000 square feet of lined bioretention areas
  • 1,000 lineal feet of 6”-8” sanitary sewer
  • 600 lineal feet of StormTec™ Chambers
  • 9,565 lineal feet of Power/Comm Ductbanks (Excavation, FTB, Backfill)
  • 3 EA installation of Tide-Flex Valves
  • 13 EA Contech StormFilter Vaults
  • Cleaning and jetting of existing onsite storm drain outfall to Puget Sound
  • Cleaning and jetting of existing sanitary sewer system
  • Well-Point Dewatering Systems

• Over 200,000 craft-hours from start to finish