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GRL Engineers offer a wide range of deep foundation testing and consulting services, nationwide. Most GRL Engineers have achieved Advanced Level or higher on both the PDCA/PDI Dynamic Measurement and Analysis Proficiency Test.

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Southwest Florida International Airport Expansion

Challenge: The Southwest Florida International Airport in Fort Myers Florida underwent a $1.1 Billion expansion in the second phase of the airport’s reconstruction project. The airport expansion was an effort to accommodate an expected growth in passenger traffic, and was led by the Lee County Port Authority. The first phase of the project was a $331 million expansion on the airport terminal. The second phase of this project looks to…

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Extensive Load Test Drilled Shaft Program with Integrity Assessments

Challenge: A project in Ohio for a large plant was initiated in 2023. A substantial test program was established. The goal of the program was to confirm the shaft design in compression, tension, and lateral capacity, as well as establish proper shaft installation techniques for production shafts. Integrity testing was used to identify potential anomalies in the concrete shafts. Method: The job was divided into three test locations, which each…

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Barrette Integrity Measurements for High Rise Construction in Paraguay

Challenge: A 55‑story residential tower in Asunción required measurement of concrete integrity for deep barrette foundations installed within a constrained urban site. The foundation system consisted of 44 barrettes, each approximately 36 to 40 meters in length. The size of the reinforcement cages, combined with limited site access, required an integrity evaluation approach that could be implemented efficiently during construction while minimizing risk to instrumentation and avoiding impacts to the…

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Alligator River Bridge

Challenge: The Alligator River Bridge, built in 1960, is a swing-span bridge that allows for boat passage on the Alligator River. Due to recuring mechanical failures and bridge repairs, a new bridge was proposed and designed. The new bridge is 3.28 miles-long with a planned 100-year lifespan. The cost of…

John Glenn International Airport Terminal in Columbus

Challenge: Work on the John Glenn International Airport's new Midfield Terminal is part of a major upgrade initiative intended to add a terminal and improve access for the growing Columbus region. News reports describe the effort as a multiyear program valued at nearly two billion dollars with a new million…

Dynamic Load Testing of Micropiles

Micropiles were first used in Italy for retrofitting existing structures and enhancing the load bearing capacity of their foundations. Micropiles lend themselves to installation in constrained spaces, often with low headroom and are utilized in locations with very soft overburden soils. Compression static load testing, although a commonly used and…

Velsicol Chemical Corporation Superfund Remediation

Challenge: The Velsicol Chemical Corporation in St. Louis, Michigan underwent a Superfund Remediation Program initiated in 1999 to address environmental concerns. Issues of contamination in surrounding soil and the Pine River led to remediation. Once river sediment and soil contamination were addressed, it was determined that a downgradient vertical barrier…

Barrette Integrity Measurements for High Rise Construction in Paraguay

NICTD South Shore Extension

Challenge: The West Lake Corridor Project was introduced to expand the Northern Indiana Commuter Transportation District’s (NICTD) commuter rail service with an approximately eight-mile-long extension of the South Shore Line (SSL). The project included construction of bridges, elevated structures, retaining walls, a pedestrian bridge, pedestrian tunnels, and train stations with…

Remote SQUID Testing at Frankfort Road over Raccoon Creek – ECMS 101165

Challenge: GRL Engineers, Inc., provided drilled shaft base cleanliness testing services for the Frankfort Road over Raccoon Creek Bridge Replacement Project in Monaca, PA. GRL was contracted in 2025 to provide SQUID testing, a quick and reliable method to obtain quantitative measurements of the debris thickness at the bottom of…

Rigid Inclusion Test Piles for Retaining Walls

Challenge: A railroad track extension project in Kansas City necessitated the construction of three retaining walls. Soil improvements required precast retaining walls initially designed as rammed aggregate piers. The contractor proposed rigid inclusions (non-reinforced auger-cast-in place piles (ACIP)) as an alternative foundation type. The initial design included 24-inch diameter ACIP…

Deep Foundation Remote Testing Services from Any Location

GRL Engineers can efficiently support projects in nearly any location, at any time with minimal notification, via our remote testing services. Leveraging SiteLink® technology, our engineers are able to stream real-time data from various testing devices directly to an offsite computer. GRL’s remote testing services enhance collaboration, reduce project downtime,…

Terminal and Parking Garage Expansion at the Mobile International Airport

Challenge: The Mobile International Airport began construction on a new terminal and parking garage in 2024 with a budget of $381 million. The new terminal was designed to accommodate five new air gates, with space to expand to twelve, and a five-story parking garage with 1,250 parking spaces. Load Testing was…

Cross-Border Testing on the Gordie Howe Bridge

Challenge: GRL Engineers provided deep foundation testing services for the landmark Gordie Howe International Bridge for both the United States and Canadian sides. The bridge has the longest main span of any cable-stayed bridge in North America, spanning 2,800 ft. GRL provided deep foundation recommendations and testing services starting in…

Raritan River Bridge Replacement

Challenge: The Raritan River Bridge in New Jersey was originally built in 1908 and served as a swing-span bridge along the Jersey Coast Line. Due to the low profile of the bridge, the structure has experienced damage from storms, notably Hurricane Sandy in 2012, which caused a multi-day outage, interfering…

Deep Foundation Testing Services Available to Address All Project Specifications

Deep foundation testing methods are utilized to provide information regarding a structure’s integrity, load capacity, concrete quality, conformance to the foundation design and potential optimization of the deep foundations. GRL Engineers, Inc. has provided a variety of deep foundation testing services and analyses for 50 years. Many projects require multiple…

Southwest Florida International Airport Expansion

Multi-Year Testing on Highway I-69

Challenge: The construction of I-69, a major US interstate highway that starts at the bottom of Texas and travels northeast to Michigan and into Ontario, was a multi-decade endeavor and a massive undertaking for the FHWA. GRL Engineers provided a multitude of testing services throughout the state of Indiana. Some…

Plaquemines LNG Megaproject in Port Sulphur

Challenge: Venture Global, Inc. set off the construction of the Plaquemines LNG terminal, making the plant one of the largest LNG facilities globally with an export capacity estimated to be 20 million tonnes per annum (MTPA). The massive project would require the installation and testing of thousands of piles to…

Dynamic Load Testing on Helical Piles

Challenge: The YWCA of Toledo wanted to add 11,000+ sf of usable space by installing a foundation through the existing basement swimming pool to support two new floors being constructed above it. Due to low clearance restrictions within the building structure, micropiles were used in the initial foundation design. The…

Corvallis Van Buren Bridge Replacement

Challenge: The Corvallis Van Buren Bridge, originally constructed in 1913, underwent a replacement initiative to create an earthquake-ready bridge over the Willamette River on eastbound OR-34. Although the area near the bridge was used as a community dump site in the early 20th century, today this stretch of the Willamette…

St. Francis Hospital Parking Garage Replacement

Challenge: The Saint Francis Hospital in Hartford, Connecticut is one of the largest hospital facilities in New England, housing a Level 1 trauma center with 617 beds and is a major teaching hospital. The original facility was constructed in 1885, and a four-level parking garage was constructed in 1983. The…

Ashbridges Bay Wastewater Treatment Plant

Challenge: The Ashbridges Bay plant is one of Toronto’s four wastewater treatment plants which services the metropolitan area. According to an annual report, it was determined that the plant was ready for several upgrades. The proposed foundation consisted of large diameter pipe piles with conical tips. GRL Engineers provided static…

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Case

Studies

Featured

Southwest Florida International Airport Expansion

Featured

Extensive Load Test Drilled Shaft Program with Integrity Assessments

Featured

Barrette Integrity Measurements for High Rise Construction in Paraguay

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