Geotechnical engineering is essential for assessing ground conditions and ensuring safe construction practices. Companies in Pennsylvania focus on subsurface investigations, environmental assessments, and foundation designs to support various infrastructure projects. With growing awareness of environmental sustainability, these firms increasingly incorporate green practices into their services. As infrastructure demands in urban and rural areas rise, innovations in ground improvement and remediation techniques are becoming focal points for many firms. The industry is poised for growth, with ongoing investment in technology enhancing the precision and efficiency of geotechnical engineering solutions.


The geotechnical engineering companies in this listing range significantly in size and specialization, with many founded in the 1980s and 1990s. Headquartered across Pennsylvania cities like Pittsburgh and Canonsburg, these firms employ from a small team to hundreds of professionals. Their services include soil testing, construction inspections, and environmental remediation. While their methodologies and client bases vary, common themes of innovation and quality arise, reflecting their positions in a dynamic market.


Read on to discover the top geotechnical engineering companies in Pennsylvania.


Top 24 Geotechnical Engineering Companies in Pennsylvania


1. Earth Engineering Incorporated


Earth Engineering Incorporated, based in East Norriton, Pennsylvania, is a private engineering consulting firm that specializes in geotechnical and environmental services. Established in 1990, the company has built a reputation for delivering quality engineering solutions tailored to the needs of the construction and real estate sectors. Their service offerings include geotechnical investigations, construction inspection and testing, geotechnical design, and environmental assessments. With a team of experienced professionals, Earth Engineering is dedicated to ensuring project safety and compliance, providing clients with reliable data and innovative strategies to keep projects on track. The firm operates across the Tri-State Area, with multiple offices in Pennsylvania and New Jersey, allowing them to effectively serve a broad client base. Their commitment to quality and client satisfaction is evident in their mission to provide on-time, on-budget performance for every project.


2. Geo-Solutions Inc.

  • Website: geo-solutions.com
  • Ownership type: Private Equity
  • Headquarters: New Kensington, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 96%, Canada 4%
  • Latest funding: November 2023
  • Founded year: 1996
  • Headcount: 51-200
  • LinkedIn: geo-solutions-inc.

Geo-Solutions Inc., founded in 1996 and based in New Kensington, Pennsylvania, is a geotechnical contractor that specializes in innovative environmental services. The company addresses complex soil and groundwater issues, providing practical solutions for clients across various sectors, including utilities, manufacturing, and government. With a workforce of approximately 77 employees, Geo-Solutions has established itself as a reliable partner in environmental remediation and construction services. Their offerings include advanced techniques such as slurry walls, soil mixing, and permeable reactive barriers, which are critical for effective site remediation and infrastructure support. The firm has also been involved in notable projects, such as improvements in the Florida Everglades, showcasing their capability to handle significant environmental challenges. Recently, they have attracted investment from Blue Sage Capital, indicating a strategic move to enhance their operational capacity and market presence.


3. Nicholson Construction


Nicholson Construction Company, based in Canonsburg, Pennsylvania, has been a significant player in the geotechnical construction industry since its founding in 1955. With a workforce of approximately 332 employees, the company specializes in the design and installation of deep foundation elements, earth retention systems, and ground treatment solutions. Nicholson serves a variety of sectors, including transportation, water, energy, and industrial projects, showcasing their ability to tackle complex soil challenges. Their commitment to safety and innovation is reflected in their numerous project awards and recognitions, including the President's Award from the International Association of Foundation Drilling received by one of their executives. As a subsidiary of Soletanche Bachy, Nicholson benefits from a robust international network, allowing them to leverage global expertise while maintaining a strong local presence. Their ongoing projects and expansions, such as new offices and collaborations, indicate a proactive approach to growth and adaptation in the industry.


4. American Geotechnical & Environmental Services, Inc.


American Geotechnical & Environmental Services, Inc. (A.G.E.S., Inc.) is a geotechnical engineering firm based in Canonsburg, Pennsylvania, with additional offices in King of Prussia, Pennsylvania, McLean, Virginia, and New Jersey. Established in 1995, the company has grown from a small two-person operation to a robust team of over 70 professionals, including 30 licensed engineers and geologists. A.G.E.S. specializes in subsurface explorations, soil testing, and environmental assessments, catering to both public infrastructure projects and private sector clients. The firm has been involved in significant projects, providing geotechnical design services for over $10 billion in construction, including extensive work on highways and bridges. Their expertise extends to complex geotechnical challenges, and they are well-versed in DOT design manuals and federal guidelines. A.G.E.S. is committed to professional development, encouraging staff involvement in industry societies and maintaining a strong focus on client relationships and innovative engineering solutions.


5. GeoStructures, Inc.

  • Website: geostructures.net
  • Ownership type: Private
  • Headquarters: King Of Prussia, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2001
  • Headcount: 11-50
  • LinkedIn: geostructures-inc._2

GeoStructures, Inc. is an engineering consulting firm based in King of Prussia, Pennsylvania, specializing in geotechnical engineering and construction monitoring. Established in 2001, the company has built a reputation for providing a comprehensive array of services, including foundation design, soil analysis, and environmental assessments. With a team of skilled engineers, GeoStructures focuses on identifying subsurface factors that influence project outcomes, ensuring safety and compliance with engineering standards. Their portfolio includes significant projects like the FMC Tower and the Pennsylvania Turnpike Southern Beltway, reflecting their capability to manage complex engineering tasks. The firm is also recognized for its innovative approaches, having received accolades such as the Project of the Year from the Delaware Valley Geo-Institute. Their commitment to quality service and technical excellence positions them as a relevant entity in the geotechnical engineering field.


6. AWK Consulting Engineers, Inc.

  • Website: awkengineers.com
  • Ownership type: Private
  • Headquarters: Turtle Creek, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1983
  • Headcount: 11-50
  • LinkedIn: awkengineers

AWK Consulting Engineers, Inc. is a consulting engineering firm based in Turtle Creek, Pennsylvania, with additional offices in Harrisburg, Orlando, and Livermore. Founded in 1983, the company has built a reputation for its expertise in geotechnical, environmental, civil/site design, and structural engineering. With a workforce of approximately 58 professionals, AWK is equipped to handle a variety of engineering challenges. The firm has successfully completed numerous projects, often collaborating with prime consultants and public agencies. Their services include geotechnical investigations, foundation recommendations, and environmental assessments, among others. AWK's commitment to quality and innovation is evident in their approach to infrastructure projects, making them a reliable partner in the engineering sector.


7. ACA Engineering, Inc.

  • Website: acaengineering.com
  • Ownership type: Private
  • Headquarters: Pittsburgh, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1996
  • Headcount: 11-50
  • LinkedIn: aca-engineering-inc-

ACA Engineering, Inc., based in Pittsburgh, Pennsylvania, is a private engineering firm founded in 1996. The company specializes in geotechnical engineering, construction inspection, and environmental services. With a team of 27 employees, ACA Engineering is dedicated to providing innovative and cost-effective solutions to its clients. They cater to a variety of sectors, including private firms and governmental agencies, ensuring compliance and safety in construction and environmental projects. Their geotechnical services include site investigations, foundation design, and slope stability analysis, among others. Additionally, they offer construction inspection and materials testing, which are crucial for maintaining quality standards in construction. ACA Engineering's commitment to quality and detail is evident in their operational practices, making them a reliable partner in the engineering field.


8. Sci-Tek Consultants, Inc.

  • Website: scitekanswers.com
  • Ownership type: Private
  • Headquarters: Pittsburgh, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1996
  • Headcount: 11-50
  • LinkedIn: sci-tek-consultants-inc.

Sci-Tek Consultants, Inc. is an engineering consulting firm based in Pittsburgh, Pennsylvania, established in 1996. The company specializes in civil, geotechnical, and environmental engineering, as well as surveying. With a workforce of approximately 36 employees, Sci-Tek has successfully completed over 1,100 projects across various sectors, including aviation, higher education, housing, and transportation. Their geotechnical engineering services include subsurface exploration, geotechnical analysis for construction projects, and foundation design recommendations. The firm operates primarily in the Eastern United States and serves a mix of public and private clients, demonstrating their capability to address complex engineering challenges. Sci-Tek is also recognized as a certified minority business enterprise, reflecting their commitment to diversity and inclusion within the industry.


9. CMT Laboratories, Inc.

  • Website: cmtlabsinc.com
  • Ownership type: Private
  • Headquarters: College Township, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 50%, South Africa 50%
  • Founded year: 1959
  • Headcount: 11-50
  • LinkedIn: cmt-laboratories-inc.

CMT Laboratories, Inc., based in College Township, Pennsylvania, is an engineering firm that has been operational since 1959. Originally founded as Universal Technical, Inc., the company has evolved to focus on geotechnical engineering, construction material testing, and special inspections. CMT serves a variety of clients in the construction and engineering sectors, providing essential services that ensure compliance with safety and quality standards. Their expertise includes subsurface exploration, soil science consulting, and deep foundation system design. CMT's laboratory in State College is accredited by the AASHTO Accreditation Program, demonstrating their proficiency in laboratory testing and quality control. They are also recognized by the Pennsylvania Department of Transportation as an approved testing laboratory. CMT's involvement in significant projects, such as the Mount Nittany Medical Center, showcases their ability to tackle complex geotechnical issues, including the use of micropiles and grouting techniques to address challenging subsurface conditions. With a dedicated team of registered engineers and technicians, CMT Laboratories continues to provide valuable services to clients throughout Pennsylvania and beyond.


10. GeoTech Engineering, Inc


GeoTech Engineering, Inc. is a private engineering firm based in Morrisdale, Pennsylvania, founded in 1996. The company specializes in a range of services, including civil engineering, environmental consulting, geological assessments, and surveying. With a workforce of approximately 28 employees, GeoTech has built a reputation for providing timely and cost-effective solutions tailored to the needs of both private clients and government agencies. Their service offerings include geotechnical engineering, which involves subsurface investigations, foundation recommendations, and slope stability analysis. The firm is also involved in oil and natural gas services, midstream and gathering pipeline design, and environmental services, showcasing their adaptability to various industry demands. GeoTech Engineering operates in several states and is committed to maintaining high safety standards, as evidenced by their certifications from ISNetWorld and PEC Safety. Their practical experience and client-focused approach make them a notable player in the engineering sector.


11. Rizzo International

  • Website: rizzointl.com
  • Ownership type: Private
  • Headquarters: Pittsburgh, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 93%, Other 7%
  • Founded year: 1984
  • Headcount: 51-200
  • LinkedIn: rizzo-international

Rizzo International, Inc. is an engineering consulting firm based in Pittsburgh, Pennsylvania, founded in 1984. The company specializes in civil, geotechnical, structural, and hydrologic engineering, providing innovative solutions to complex engineering challenges. With a workforce of approximately 147 employees, Rizzo International has established a reputation for delivering expert analysis and design services, particularly in the infrastructure and power generation sectors. Their geotechnical engineering services include foundation engineering, advanced modeling, and forensic analysis, with significant experience in projects like the Vogtle Nuclear Power Plant and the Barakah Nuclear Power Plant. The firm is also certified as a Women’s Business Enterprise, enhancing its profile in public works projects. Rizzo International's commitment to quality is reflected in their ISO 9001:2015 and ISO 14001:2015 certifications, ensuring compliance and excellence in their engineering practices.


12. D'Appolonia Engineering

  • Website: dappolonia.com
  • Ownership type: Private
  • Headquarters: Pittsburgh, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 91%, India 9%
  • Founded year: 1956
  • Headcount: 11-50
  • LinkedIn: d%27appolonia-gti

D'Appolonia Engineering, based in Pittsburgh, Pennsylvania, is a private engineering consulting firm established in 1956. With a workforce of around 34 employees, the company specializes in civil, environmental, and geotechnical engineering. They serve a variety of clients, including industrial and governmental entities, educational institutions, and healthcare facilities. D'Appolonia has a notable history of addressing complex engineering challenges, particularly in the areas of dam and waterway projects, where they have completed over 200 related initiatives. Their services include site selection, feasibility evaluations, design and rehabilitation of dams, and geotechnical analyses. The firm prides itself on maintaining strong client relationships and delivering technically sound solutions that meet safety and regulatory standards. D'Appolonia's engineers are committed to staying current with industry advancements, ensuring that they implement both traditional and innovative technologies in their work.


13. Penn E&R

  • Website: penn-er.com
  • Ownership type: Private
  • Headquarters: Doylestown, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1996
  • Headcount: 51-200
  • LinkedIn: penn-e-%26-r

Penn Environmental & Remediation, Inc. (Penn E&R) is a consulting firm based in Doylestown, Pennsylvania, founded in 1996. The company specializes in environmental, engineering, and construction services, catering to a variety of sectors including construction, utilities, and government. Penn E&R offers a comprehensive range of services, with a notable emphasis on environmental assessments, remediation, and civil engineering. Their expertise extends to geotechnical services, where they assess subsurface conditions and provide critical insights into soil and rock mechanics. The firm prides itself on delivering reliable and cost-effective solutions, ensuring projects are executed on time and within budget. With a dedicated team of professionals, Penn E&R is committed to supporting clients through various stages of project development, from initial assessments to final construction.


14. Gannett Fleming

  • Website: gannettfleming.com
  • Ownership type: Private Equity
  • Headquarters: Mechanicsburg, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 90%, Canada 10%
  • Latest funding: March 2023
  • Founded year: 2004
  • Headcount: 1001-5000
  • LinkedIn: gannett-fleming

Gannett Fleming is a consulting firm based in Mechanicsburg, Pennsylvania, specializing in architecture, engineering, and construction services. Founded in 2004, the company has grown to employ nearly 3,000 professionals, primarily in the United States and Canada. Gannett Fleming addresses complex infrastructure challenges across various sectors, including transportation, water resources, and energy. Their services include advisory, engineering, and technology implementation, with a notable emphasis on geotechnical and geological solutions. The firm is committed to sustainability and resilience in its projects, ensuring that they meet the evolving needs of both government and private sector clients. Gannett Fleming's recent merger with TranSystems further enhances its capabilities in infrastructure consulting, positioning it as a significant player in the industry.


15. Gilmore & Associates, Inc.

  • Website: gilmore-assoc.com
  • Ownership type: Private
  • Headquarters: New Britain, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 99%
  • Founded year: 1918
  • Headcount: 51-200
  • LinkedIn: gilmore-%26-associates

Gilmore & Associates, Inc. is a consulting firm based in New Britain, Pennsylvania, established in 1918. The company specializes in civil engineering, surveying, landscape architecture, and environmental services, with a strong focus on sustainable development and regulatory compliance. They serve a variety of clients, including municipalities, government agencies, and private sector entities. Gilmore & Associates has a notable presence in the geotechnical engineering sector, offering services such as subsurface exploration, foundation design, and slope stability analysis. Their portfolio showcases involvement in numerous infrastructure projects, highlighting their expertise and commitment to community planning and development. With a workforce of 51-200 employees, they continue to play an active role in the engineering industry, adapting to the evolving needs of their clients and the environment.


16. Rettew

  • Website: rettew.com
  • Ownership type: Private
  • Headquarters: Lancaster, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1969
  • Headcount: 201-500
  • LinkedIn: rettew-associates-inc-

Rettew is an engineering consulting and construction services firm based in Lancaster, Pennsylvania, founded in 1969. With a workforce of approximately 324 employees, Rettew provides a wide array of solutions across various sectors, including environmental, infrastructure, and project management. The company emphasizes collaboration to effectively meet client needs. Rettew's services include geotechnical engineering, which plays a vital role in their project offerings. They have built a reputation for managing complex projects while ensuring compliance with regulations and maintaining efficiency. Their team consists of skilled professionals, including engineers and geologists, who work together to deliver reliable solutions. Rettew's commitment to quality and client satisfaction is evident in their project management approach and their ability to navigate the intricacies of engineering and environmental challenges.


17. Stahl Sheaffer Engineering

  • Website: stahlsheaffer.com
  • Ownership type: Private
  • Headquarters: College Township, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2006
  • Headcount: 51-200
  • LinkedIn: stahl-sheaffer-engineering-llc

Stahl Sheaffer Engineering, founded in 2006 and based in College Township, Pennsylvania, is a private engineering firm that specializes in multi-discipline civil and structural engineering services. With a workforce of approximately 110 employees, the company serves a variety of clients, including public agencies, private developers, and educational institutions. Their service offerings include construction inspection, geotechnical services, and transportation engineering, among others. Stahl Sheaffer operates across multiple states, holding licenses in 23 states, which allows them to undertake projects in various regions. Their geotechnical services are particularly robust, featuring a fully accredited laboratory that conducts a wide array of soil and material tests. The firm has been recognized in the ENR Mid-Atlantic Top Design Firms list for several consecutive years, highlighting their standing in the industry. They have also been involved in numerous significant projects, showcasing their expertise and commitment to quality in geotechnical engineering.


18. Rhea Engineers & Consultants, Inc.

  • Website: rhea.us
  • Ownership type: Private
  • Headquarters: Moon Township, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2001
  • Headcount: 11-50
  • LinkedIn: rh-a-engineers-%26-consultants-inc-

Rhea Engineers & Consultants, Inc. is a woman-owned engineering and consulting firm based in Moon Township, Pennsylvania. Established in 2001, the company specializes in civil, environmental, geotechnical, and water resources engineering. With a team of 18 professionals, Rhea is dedicated to providing innovative and cost-effective solutions to complex engineering challenges. They serve a variety of clients, including federal and state government agencies, commercial enterprises, and institutional organizations. Rhea's geotechnical engineering services include site evaluation, investigation, and design, showcasing their capability to handle significant projects. The firm is committed to quality service and customer satisfaction, emphasizing professional growth and community betterment. Rhea holds several certifications, including Women’s Business Enterprise (WBE) and Disadvantaged Business Enterprise (DBE), which enhance their credibility in the industry.


19. Menard Usa

  • Website: menardusa.com
  • Ownership type: Private
  • Headquarters: Carnegie, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1984
  • Headcount: 201-500
  • LinkedIn: menard---usa

Menard USA, based in Carnegie, Pennsylvania, is a private geotechnical contractor founded in 1984. The company specializes in ground improvement solutions, addressing problematic soil conditions that can complicate construction projects. Menard USA employs innovative techniques to provide effective alternatives to traditional deep foundations, making their services valuable to construction companies and government agencies alike. Their expertise spans various sectors, including buildings, transportation, and energy, showcasing their capability to handle a wide range of projects. Menard USA is part of the Menard Group, which has a strong international presence and reputation for quality and engineered solutions. The company has completed numerous projects across the United States, demonstrating their operational capacity and commitment to the geotechnical engineering industry.


20. Ingram Engineering Services, Inc


Ingram Engineering Services, Inc. is a private engineering firm based in West Chester, Pennsylvania, founded in 2007. With a team of 15 employees, the company specializes in structural and geotechnical engineering, as well as special inspections and laboratory testing. They cater to a wide range of clients, including those in commercial, residential, and institutional sectors. The firm prides itself on delivering practical and economical solutions to engineering challenges, particularly in the geotechnical domain. Their services include soil and foundation investigations, deep foundation design, and drainage studies, among others. Ingram Engineering is also equipped with an AASHTO accredited laboratory for materials testing, enhancing their capability to provide comprehensive engineering services. The company is committed to quality and integrity, striving to find innovative solutions for their clients' needs.


21. A&A Consultants, Inc.

  • Website: aaconsultinc.com
  • Ownership type: Private
  • Headquarters: Pittsburgh, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 94%, Egypt 6%
  • Founded year: 1996
  • Headcount: 11-50
  • LinkedIn: a%26a-consultants-inc-

A&A Consultants, Inc. is a private engineering firm based in Pittsburgh, Pennsylvania, founded in 1996. With a workforce of 11-50 employees, the company specializes in a variety of engineering services, including bridge design, civil and highway engineering, structural engineering, and notably, geotechnical engineering. Their geotechnical engineering division is dedicated to providing clients with safe and cost-effective designs and recommendations. A&A Consultants serves a range of clients, including transportation agencies, architects, developers, and contractors, ensuring that their infrastructure projects are both effective and sustainable. The firm also offers construction management and material testing services, further solidifying their role in the engineering sector. Their operational footprint primarily spans Western Pennsylvania, Eastern Ohio, and Northern West Virginia, showcasing their regional expertise and commitment to local projects.


22. Cowan Associates, Inc.

  • Website: cowanassociates.com
  • Ownership type: Private
  • Headquarters: Quakertown, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1958
  • Headcount: 11-50
  • LinkedIn: cowan-associates-inc.

Cowan Associates, Inc. is a private engineering firm based in Quakertown, Pennsylvania, established in 1958. With a workforce of 11 to 50 employees, the company offers a broad spectrum of engineering services, including building, environmental, municipal, and notably, geotechnical engineering. They cater to a variety of clients, including developers, contractors, and government agencies, assisting them in navigating complex engineering challenges while ensuring compliance with regulations. The firm is recognized for its expertise in geotechnical evaluations, hydrogeology studies, and environmental impact assessments, showcasing their capability to handle intricate projects. Their extensive experience and established reputation in the industry make them a significant player in the engineering landscape.


23. Nge

  • Website: ngeconsulting.com
  • Ownership type: Private
  • Headquarters: Moon Township, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2002
  • Headcount: 11-50
  • LinkedIn: nge

NGE, based in Moon Township, Pennsylvania, is an engineering consulting firm that specializes in environmental and geotechnical services. Established in 2002, the company has built a reputation for providing a comprehensive range of services tailored to meet the needs of various industries, including oil and gas, construction, and environmental compliance. NGE's expertise spans geotechnical engineering, drilling, laboratory testing, and construction monitoring, allowing them to support clients through the entire project lifecycle. The firm prides itself on its experienced team, which combines technical knowledge with practical insights to navigate regulatory challenges and manage environmental risks effectively. NGE's commitment to safety and quality is evident in their operational practices and client feedback, positioning them as a reliable partner in the geotechnical sector.


24. Geotechnics

  • Website: geotechnics.net
  • Ownership type: Private
  • Headquarters: East Pittsburgh, Pennsylvania, United States (USA)
  • Employee distribution: United States (USA) 48%, Egypt 24%, Nigeria 10%, Other 18%
  • Founded year: 1983
  • Headcount: 11-50
  • LinkedIn: geotechnics

Geotechnics, founded in 1983 by Randy O’Rourke, is a private geotechnical testing firm based in East Pittsburgh, Pennsylvania. The company specializes in providing a wide range of testing services that cater to sectors such as energy, civil engineering, landfill management, and industrial projects. With a workforce of approximately 93 employees, Geotechnics operates multiple locations across the United States, including Raleigh, Nashville, and St. Louis. Their services include both laboratory and field testing, ensuring that construction projects meet safety and compliance standards. Geotechnics has built a reputation for integrity in testing, which is crucial for their clients in construction and government sectors. The company has not reported any funding, indicating a self-sustained operational model. Their extensive experience in various projects, including highways, bridges, and dams, further solidifies their role in the geotechnical engineering industry.



Geotechnical Engineering Insights: Key Companies in Pennsylvania


CompanyHeadquarterSizeFoundedOwnership
Earth Engineering IncorporatedEast Norriton, Pennsylvania, United States (USA)51-2001990Private
Geo-Solutions Inc.New Kensington, Pennsylvania, United States (USA)51-2001996Private Equity
Nicholson ConstructionCanonsburg, Pennsylvania, United States (USA)201-5001955Private
American Geotechnical & Environmental Services, Inc.Canonsburg, Pennsylvania, United States (USA)51-2001995Private
GeoStructures, Inc.King Of Prussia, Pennsylvania, United States (USA)11-502001Private
AWK Consulting Engineers, Inc.Turtle Creek, Pennsylvania, United States (USA)11-501983Private
ACA Engineering, Inc.Pittsburgh, Pennsylvania, United States (USA)11-501996Private
Sci-Tek Consultants, Inc.Pittsburgh, Pennsylvania, United States (USA)11-501996Private
CMT Laboratories, Inc.College Township, Pennsylvania, United States (USA)11-501959Private
GeoTech Engineering, IncMorrisdale, Pennsylvania, United States (USA)11-501996Private
Rizzo InternationalPittsburgh, Pennsylvania, United States (USA)51-2001984Private
D'Appolonia EngineeringPittsburgh, Pennsylvania, United States (USA)11-501956Private
Penn E&RDoylestown, Pennsylvania, United States (USA)51-2001996Private
Gannett FlemingMechanicsburg, Pennsylvania, United States (USA)1001-50002004Private Equity
Gilmore & Associates, Inc.New Britain, Pennsylvania, United States (USA)51-2001918Private
RettewLancaster, Pennsylvania, United States (USA)201-5001969Private
Stahl Sheaffer EngineeringCollege Township, Pennsylvania, United States (USA)51-2002006Private
Rhea Engineers & Consultants, Inc.Moon Township, Pennsylvania, United States (USA)11-502001Private
Menard UsaCarnegie, Pennsylvania, United States (USA)201-5001984Private
Ingram Engineering Services, IncWest Chester, Pennsylvania, United States (USA)11-502007Private
A&A Consultants, Inc.Pittsburgh, Pennsylvania, United States (USA)11-501996Private
Cowan Associates, Inc.Quakertown, Pennsylvania, United States (USA)11-501958Private
NgeMoon Township, Pennsylvania, United States (USA)11-502002Private
GeotechnicsEast Pittsburgh, Pennsylvania, United States (USA)11-501983Private


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