housing

The Jefferson (12th & Jefferson Workforce Housing)

Location: Seattle, Washington

The Jefferson workforce housing apartments are located in Seattle’s Central District near Seattle University. This five-story mixed-use development consists of 40 one-bedroom and two-bedroom apartments. It also includes 4,500 square feet of commercial space designed for local businesses. The building is five stories of wood-framed bearing walls over two levels of post-tensioned concrete. The building meets the Washington State Evergreen Sustainable Development Standards.

ORA was engaged as the geotechnical and structural special inspection firm of record for this project. We completed a subsurface investigation with two borings and prepared a geotechnical report for the project. Detailed design recommendations were developed for a temporary shoring system, conventional foundation support, and below-grade wall design. Our testing and inspection scope of work included the following:

Geotechnical:

  • Tieback anchor installation and testing
  • Soil bearing verification
  • Shoring installation/perform monitoring
  • Installation of internal bracing and rakers
  • Monitor adjacent building settlement
  • Erosion control – temporary
  • Observe and monitor excavation
  • Verify fill and compaction
  • Soldier pile installation (including vibration monitoring)

Structural:

  • Post-tensioned prestressed concrete
  • Reinforced concrete – cast-in-place
  • Shoring system welding
  • Structural steel fabrication and erection
  • Tieback grout strength
  • Shotcrete
  • Epoxy grouting of rebar dowels

Expo Apartments (100 Republican Apartments)

Location: Seattle, Washington

This project involved construction of a six-story, 359,000-square-foot mixed-use building which includes 275 housing units, retail space, and underground parking for 291 vehicles. Each of Expo’s three phases has its own rooftop deck and a community P-Patch garden is available. Additional amenities include an on-site 24-hour fitness center, bike storage, and a dog-washing station. Built sustainably, Expo is LEED Gold certified with features including insulated windows to conserve energy, water-efficient showerheads and faucets, and environmentally-friendly interior finishes. ORA was engaged to provide the following testing and inspection services:

  • Soil compaction
  • Epoxy grouting of anchor bolts and rebar dowels
  • High-strength hold-down system
  • Post-tensioned prestressed concrete
  • Reinforced concrete – cast-in-place
  • Reinforced masonry
  • Shotcrete
  • Structural steel fabrication and erection
  • Soil nail grout strength
  • Wood seismic resistance system
  • Intumescent fire-resistive materials
  • Floor flatness/floor levelness evaluation

Andrew's Glen

Location: Bellevue, Washington

This $12.7 million project involved construction of a 40-unit housing development for low-income and formerly homeless families and veterans. Amenities include community room with kitchen for resident activities, computer lab and library, community laundry facility, exercise facility, two landscaped outdoor areas, secured parking, modern unit finishes with bright cabinets and floor-to-ceiling windows, and evergreen energy-efficient heating and appliances. ORA was engaged to provide the following testing and inspection services:

  • Grout of vault lid panel infills
  • Reinforcing steel
  • Reinforced concrete
  • Post-tensioned concrete
  • Epoxy grouting of rebar dowels and anchor bolts
  • Lateral framing, including diaphragm/sheathing nailing, blocking, straps, clips
  • Holdown system
  • Structural steel erection/welds (guardrail brackets to embed plates)

Belroy Apartments

Location: Seattle, Washington

The original Belroy Apartment Building, built in 1931, is known for its Art Deco style and is recognized in Seattle architectural circles as one of the city’s first modernist buildings. This project involved the renovation of the interior of the 62-unit historic building, including new plumbing, wiring, flooring, appliances, and small improvements to the kitchens and bathrooms, and the construction of three new structures to the north, housing a total of 51 units. Two of the units form an L shape to complete a rectangular complex, while the third sits in the courtyard in the middle. ORA was engaged to perform geotechnical construction monitoring as well as structural special inspections and materials testing.

Our geotechnical scope of work included:
  • Shoring installation performance/monitoring
  • Monitor grading season restrictions
  • Observe and monitor excavation
  • Sub/surface drainage installation
  • Monitor slope stability
  • Erosion control – temporary and permanent
  • Monitor adjacent building settlement
  • Underpinning installation
  • Soldier pile installation
  • Soil bearing verification
  • Monitor grading season restriction
  • Verify fill and compaction
  • Drilled cast-in-place pier pile installation

Our structural scope of work included:
  • Shoring system welding
  • Soldier piles
  • Structural steel erection and fabrication
  • Steel stair erection
  • Shotcrete
  • Reinforced concrete
  • Prestressed concrete
  • Structural steel embed in concrete
  • Epoxy-grouted anchor bolts and rebar dowels
  • Wood seismic resistance system
  • Reinforced masonry

UW Student Housing – Sites 29, 31, 32, 33, 35, & Lander Hall

Location: Seattle, Washington

ORA was engaged as the Structural Special Inspection Agency of Record for the Student Housing projects which includes Sites 29, 31, 32, 33, 35, and Lander Hall. Site 29 included construction of five buildings containing 460,000 gross square feet with 930 apartment beds, 65,000 square feet of structured parking, programming space, plaza with underground water cistern, and coffee roaster/café. Site 31 included construction of two 7-story structures consisting of five levels of Type VA construction over two levels of Type IA construction. Site 32 included construction of a 7-story, 134,000-square-foot building with a residential hall containing 442 residential hall beds, program space – café, circulation space, fitness center, and classroom space. Site 33 included construction of a 7-story residential hall with common support spaces. Site 35 included construction of a 7-story, 239,000-square-foot building with a residential hall containing 600 residential hall beds, floor and study lounges, circulation space, and program space. Lander Hall included construction of a 5-story, 245,000-square-foot building containing the main dining facility and student resource desk for the University of Washington’s West Campus neighborhood.

Our testing and inspection scope included the following elements:
  • Brick veneer
  • High-strength holdown system
  • Post-tensioned prestressed concrete
  • Reinforced concrete
  • Reinforced masonry
  • Shotcrete
  • Steel stair erection
  • Structural steel fabrication and erection
  • Tieback grout strength
  • Wood seismic resistance system
  • Gypcrete
  • Floor flatness/ floor levelness evaluation
  • Locating (subsurface interface radar)

New Tacoma Senior Housing

Location: Tacoma, Washington

This $17 million project involved the construction of a new four-story affordable apartment building for low-income senior citizens. There are areas for outdoor activities, as well as a bio-swale for stormwater runoff. The project includes a large multi-purpose community room with a residential-style kitchen, a large interior deck located above the garage at the first floor level, a computer lab, an exercise room, a TV and movie room, a library, an arts and crafts room, and shared laundry rooms. ORA was engaged to provide geotechnical and structural special inspection and testing services. Our scope of work included the following:

Geotechnical:

  • Soil bearing verification
  • Excavation monitoring
  • Fill placement and compaction testing
  • Erosion control inspection

Structural:

  • Shotcrete
  • Reinforced masonry
  • Reinforced concrete
  • Post-tensioned prestressed concrete
  • Structural steel fabrication and erection
  • Ultrasonic examination of welds
  • Lateral framing
  • Water retention

Otto Rosenau & Associates, Inc. (ORA) | 6747 Martin Luther King Jr. Way S. | Seattle, WA 98118-3216 | U.S.A