Our Project Experience

Geotechnical Services from Single Family Homes to High-Rise Developments

HGSI has 35+ years of experience working on all types of development projects, from working directly with homeowners to civil engineers and land developers. See below for a sampling of projects we have worked on.

Residential

Currin Creek Estates

Currin Creek Estates, Estacada, OR

Currin Creek Estates is an 86-lot, low density, single-family home residential development, located in Estacada, Oregon

GEOTECHNICAL ENGINEERING SERVICES HIGHLIGHTS

Complex project in multiple phases
Subsurface drainage and cutoff drain needed due to groundwater seepage
Expansive soil mitigation
Cement treatment for fill compaction in wet weather
Lot-specific foundation evaluations and wall designs

Graystone Estates

Graystone Estates, St. Helens, OR

Graystone Estates is a 78-lot residential subdivision development, located in St. Helens, OR. Two large parcels of land may include future commercial development within this area.

GEOTECHNICAL ENGINEERING SERVICES HIGHLIGHTS

Project site is in area of former gravel pit
Undocumented fill removal and recompaction
Hard rock excavation and rock fill placement
Lock and Load wall design

Shady Peak Subdivision

Shady Peak Subdivision, Beaverton, OR

Shady Peak Subdivision is a 24-lot residential subdivision located in Beaverton, Oregon.

GEOTECHNICAL ENGINEERING SERVICES HIGHLIGHTS

Project on north facing slope of Cooper Mountain
Allan Block and Ultra Block wall designs
Creative incorporation of pre-existing Ultra Block wall segments into final wall design
Undocumented fill removal and recompaction issues
Pavement section design facilitated grind and inlay option instead of complete replacement for offsite SW 175th Avenue improvements

Scholls Heights Subdivision

Scholls Heights Subdivision – Phase 3, Beaverton, OR

GEOTECHNICAL ENGINEERING SERVICES HIGHLIGHTS

Performed preliminary geotechnical report for entire Scholls Heights project
Hard rock excavation and rock fill placement
Creative on-site disposal of topsoil strippings and boulders
Lock and Load wall design

South Cooper Mountain

South Cooper Mountain Heights – Multi-Family Residential / Blended Dwellings, Beaverton, OR

South Cooper Mountain is a blended dwelling development of 250-lot residential subdivision and a large multi-family phase. The community has walking trails in close proximity to schools and a variety of area amenities. Located in Beaverton, Oregon.

GEOTECHNICAL ENGINEERING SERVICES HIGHLIGHTS

Complex project with multiple phases
Successfully navigated City of Beaverton inspection and testing requirements
Extensive pavement section analysis
Hard rock excavation and rock fill placement
Lock and Load, and Allan Block wall design

Stafford Meadows Residential Community

Stafford Meadows Subdivision – Wilsonville, OR

Stafford Meadows is a development of a 44-lot residential subdivision community with walking trails, community parks in close proximity to a variety of area amenities. Located on the west side of Stafford Road in Wilsonville, OR, Stafford Meadows was part of the 2019 Street of Dreams.

GEOTECHNICAL ENGINEERING SERVICES HIGHLIGHTS

Performed multiple geotechnical evaluations during site acquisition
Stream crossing with Allan Block walls
Cement treatment for fill compaction in wet weather
Lot-specific foundation evaluations and wall designs

Yamhill Park Estates

Yamhill Park Estates, Yamhill, Oregon

Yamhill Park Estates is a 62-lot, single-family home residential development, located in Yamhill, Oregon.

GEOECHNICAL ENGINEERING SERVICES HIGHLIGHTS

Evaluated soil conditions for development in former farm field
Removed field drains throughout the site
Provided helical anchor capacities for design of timber foot bridge

Commercial

AC Hotels/Marriot; Element Hotel/Westin

Commercial Development for Two Major Hotels and Future Facilities

GEOTECHNICAL ENGINEERING SERVICES HIGHLIGHTS

Site grading involved substantial undocumented fill removals, and placement of new fills
Provided geotechnical input for sheet pile wall with fractured face panels
Cement treatment of soils to facilitate wet weather earthwork
Engineered Aggregate Piers used for support of hotel building on marginal soils impacted by shallow groundwater
HGSI personnel provided full range of geotechnical services from initial planning through construction

Airport Way Fueling Station and Convenience Store, Portland, Oregon

Commercial Development for New Fuel Station and Convenience Store

GEOTECHNICAL ENGINEERING SERVICES HIGHLIGHTS

Provided geotechnical support for urban site with shallow groundwater and soft soils
Evaluated pre-existing undocumented fill soils and differentiated fill zones suitable to remain in place
In-depth analysis of site seismicity and soil liquefaction potential

Sunnybrook Commercial Building

Sunnybrook Commercial Building, Happy Valley, Oregon

New office space building located in Happy Valley, Oregon

GEOTECHNICAL ENGINEERING SERVICES HIGHLIGHTS

Provided geotechnical support for urban site with substantial fills placed during road and adjacent bridge construction
Assisted project team in siting dry well facilities to minimize impacts to nearby buildings and tall retaining wall
Performed infiltration for design of stormwater facilities, and verified infiltration rate of constructed dry wells

Municipal

Snoqualmie Pass Cell Tower

SNOQUALMIE PASS CELL TOWER, SNOQUALMIE PASS, WASHINGTON

New Cell Tower on Site with Complex Geology Tower; this is part of the Puget Sound Emergency Radio Network (PSERN)

GEOTECHNICAL ENGINEERING SERVICES HIGHLIGHTS

Provided geotechnical support options for 135-foot self-supporting lattice tower and support facilities
Ultra Block wall design
Designed facilities for heavy ice loading at top of mountain
Performed special inspections of foundation construction
Provided troubleshooting and design modifications due to complex, tilted rock layers interbedded with soft, weathered zones discovered during construction