For the historic Rose Bowl Renovation and Improvements project, Earth Systems provided geotechnical engineering design, consulting, and materials testing services. Built in 1921 with  various portions added in subsequent years, the stadium underwent major renovations and improvements with the objectives of improving public safety, enhancing fan experience, improving facility operations, and maintaining the stadium as a National Historic Landmark. Construction occurred in three phases; the first phase began early in 2011. The stadium remained operational while the project progressed.

The project won an Award of Merit in the Sports/Entertainment category at the ENR (Engineering News-Record) California’s Best Projects for 2014 (Southern California).

Specific elements of the renovation and improvement project included:

  • Construction of tower and press box addition at the Rose Bowl Stadium
  • Press Box: Major reconstruction and additions to the existing seven-level press box and suites structure.
  • Stadium: include removal of existing and construction of new video and advertising panels, restoration of historical scoreboard, construction of new field level lounges, and field wall restoration.
  • Pedestrian Tunnels: widening of existing tunnels by removal of tunnel walls and construction of new concrete slab, walls and tunnel lid.  Exiting also includes deck repair, new aisles and seat replacement, and field level exiting improvements that may include construction of four new tunnels.
  • Concourse: removal of old and construction of new restroom buildings and public entry gate structures, construction of new concession buildings, ticket offices, and kiosks, improvements to the service yard and storage building, and upgrades of site utilities.
  • Site Work and Utilities: upgrade and replacement of major electrical service, new storm drainage system and storm-water retention/percolation system in stadium approach area.
  • Mat construction at the south end of the press box addition at the Rose Bowl Stadium

The press box additions are supported on a combination of new deep foundations (piers, caissons, and micropiles) and new mat footings. The new tunnels will consist of cast-in-place concrete retaining walls and roofs supported by conventional spread footings that bear in firm native soil.

Earth Systems personnel performed surface and shallow subsurface exploration of the site and tested soils samples in our laboratory for characteristics such as moisture and density, grain size distribution, relative strength, and consolidation. Percolation testing was conducted off-site for storm-water disposal. Geotechnical engineering analyses were conducted for liquefaction, earthquake-related settlement, slope stability, bearing capacity and load-deflection relationships for both deep and shallow foundations. The study also entailed evaluation of the geologic setting and site seismicity and assessment of geologic hazards that might affect the Rose Bowl. A geophysical survey was conducted using refraction microtremor data reduction techniques to estimate the physical properties of subsurface materials and characterize the site for seismic design. A detailed earthquake ground motion study was conducted to allow numerical dynamic analysis of the proposed press box tower structure. Based on our analyses of the data obtained from our field and laboratory testing programs, we provided conclusions and recommendations regarding foundation bearing capacity, foundation design, estimated total and differential foundation settlements, site grading criteria, lateral earth pressures, soils expansion characteristics, soil corrosion characteristics, and preliminary pavement section design. Earth Systems provided construction observation and monitoring, and materials testing and inspection services.