Terracon Companies


AQS Environmental Inc. (AQS)

AQS Environmental of Omaha joined Terracon in May of 2015.

AQS was established in 2001 and provides air quality consulting with extensive experience solving mold, asbestos, lead-based paint, indoor air quality, and radon issues. AQS serves a client base across Nebraska, Iowa, and the upper Midwest which includes public school districts and higher education institutions, medical facilities, professional consulting firms, and construction companies.


Argus Pacific

Argus Pacific of Seattle joined Terracon in March of 2015.

Founded in 1997, Argus Pacific offers industrial hygiene consultation and training related to asbestos, lead, mold, hazardous waste, emergency response, and numerous other occupational health and safety topics. Argus Pacific is a certified provider of Occupational Safety & Health Administration (OSHA), Environmental Protection Agency (EPA), Department of Occupational Safety & Health (DOSH/WISHA), and Department of Commerce consulting and regulated training.


Building Exterior Solutions, Inc. (BES)

BES joined Terracon in 2016.

BES of Houston specializes in resolving existing building enclosure problems and developing new integrated building enclosure designs. The BES staff includes licensed engineers and certified roof and waterproofing consultants who provide design for new facilities or rehabilitation of existing building enclosures that exhibit distress, deterioration, and air and/or water infiltration. Founded in 2008, the Houston firm provides innovative investigation, evaluation, and construction solutions for exterior building systems.


CHJ Consultants (CHJ)

CHJ of southern California joined Terracon in December of 2016.

CHJ was established in 2011 and provides geotechnical and materials testing services from its three southern California locations. From its headquarters and laboratory in Colton, and with a laboratory in Victorville and an office in Palm Desert, Calif., CHJ supports projects throughout the San Bernardino, Riverside, Los Angeles, and Orange Counties. CHJ’s services include geotechnical investigations, soil testing, engineering geology, environmental consulting, materials testing, and construction inspection.


Dente Group (Dente)

Dente of Albany, N.Y. joined Terracon in July of 2017.

Dente was founded in 1993, and provides geotechnical, geohydrologic, and construction materials engineering and testing services, including special inspection and drilling capabilities. Dente engineers, geologists, and technical experts have completed more than 4,000 projects throughout the Northeast including the Hudson Valley, southern and western New York, southern Vermont, and western Massachusetts. Services typically include planning, managing and performing exploratory site investigation, laboratory testing programs, preparing geotechnical reports, and managing and performing construction inspection and testing services for clients in construction, education, health care, and other engineering companies.


Dunkelberger Engineering and Testing, Inc.

Dunkelberger joined Terracon in June of 2013.

Dunkelberger is based in West Palm Beach, Fla. Founded in 1994, Dunkelberger provides geotechnical engineering, construction materials and inspection, environmental assessments, and building inspection services. Client sectors include aviation, infrastructure, government, commercial real estate, power, and solid waste.


Earth Exploration Inc. (EEI)

EEI joined Terracon in June of 2017.

Founded in 1990, EEI offers a wide range of comprehensive services including geotechnical, materials, construction, exploration, laboratory, and associated capabilities from its headquarters in Indianapolis and office in Niles, Mich. With a staff of engineers and scientists with unique expertise in site exploration and geotechnical engineering, EEI has contributed to countless industrial, commercial, educational, and governmental projects.


Geotechnical Consulting & Testing, Inc. (GC&T)

GC&T  joined Terracon in October of 2016.

Formed in 1990, GC&T is a privately owned firm primarily dedicated to providing geotechnical and materials testing services. GC&T provides services for transportation and infrastructure, commercial, industrial, retail, residential, office, medical, and hospitality projects throughout the Northern Virginia, Maryland, and Washington, D.C., metropolitan area.


IHI Environmental

IHI Environmental joined Terracon in September of 2012.

IHI Environmental is based in Salt Lake City, UT, with additional offices in Emeryville, Calif., Denver, Phoenix and Seattle. Established in 1980, IHI Environmental provides industrial hygiene, occupational safety, and environmental consulting services to public and private sector clients across the western U.S.


Liesch Associates (Liesch)

Liesch joined Terracon in January of 2013.

Liesch is based in Minneapolis, MN, and has additional offices in St. Paul, MN, and Milwaukee, WI. Founded in 1968, Liesch provides a range of environmental services including industrial hygiene, industrial water and wastewater, air quality, air compliance, environmental compliance, environmental engineering, and testing services to clients.


Mayes Testing Engineers, Inc. (Mayes)

Mayes joined Terracon in 2016.

Known as one of the largest providers of construction quality assurance services in the Pacific Northwest, Mayes has been locally owned and operated in Lynwood (Seattle), with additional offices in Tacoma, Wash. and Portland, Ore., since 1991. The Mayes team provides special inspections, materials testing, condition surveys and other materials consulting for owners, developers, architects, contractors, and structural engineers.


Neil O. Anderson and Associates (NOA)

Neil O. Anderson and Associates joined Terracon in April 2014, and are based in Lodi, California.

Founded in 1991, Neil O. Anderson and Associates is a geotechnical, environmental, and materials testing engineering firm specializing in energy, geotechnical instrumentation, geophysical methods, federal highways, and aquatic facility design services for private and public sector clients. They have additional offices located in Sacramento and Concord, Calif.


New England EnviroStrategies

New England EnviroStrategies joined Terracon in July of 2013

New England EnviroStrategies was founded in 2007 and was based in Concord, New Hampshire.

Terracon retained all of New England EnviroStrategies employees, all of whom are now based in Terracon’s Manchester, N.H., office to expand environmental services throughout the northeast.


NORCAL Geophysical Consultants Inc.

NORCAL Geophysical Consultants, Inc. of Sonoma County, Calif., joined Terracon in October of 2015.

Founded in 1983, NORCAL offers geophysical technologies in support of geologic, groundwater, environmental, and engineering investigations. NORCAL’s geophysicists and geologists provide services during the planning, design, and construction phases of infrastructure and other facilities, the assessment of environmental conditions, and the evaluation of earth resources. Its clients include national private and public companies and state, local, and municipal government agencies.


RGA Environmental (RGA)

RGA Environmental joined Terracon in May of 2014.

RGA Environmental was founded in 1985, and is based in Emeryville, California.

RGA Environmental provides hazardous materials, industrial hygiene, safety, emergency response, litigation, and environmental construction management services to public and private sector clients. They have additional offices located in Irvine, California, and Seattle, Washington.


ROC Geotechnical Consulting Engineers, PLLC (ROC)

ROC joined Terracon in 2016.

ROC is based in Rochester, N.Y., and serves clients across the public and private sectors with projects across the commercial, healthcare, energy and government markets. ROC’s services include subsurface exploration; geotechnical engineering design recommendations and laboratory analyses; and geotechnical field inspection services.


Stafford Consulting Engineers

Stafford joined Terracon in December of 2010.

Stafford provides extensive consulting engineering services related to building envelope systems, including commercial roofing and waterproofing systems. Stafford is headquartered in Charlotte, N.C., with offices in Raleigh, N.C., and Jacksonville, Fla.

Stafford was established in 1964 with the mission of providing engineering guidance for roofing and waterproofing systems. Services include: design of new or replacement roofing and waterproofing systems; roof asset management plans; construction monitoring; forensic investigations; plan and specification consultation; and additional services such as project management, general consultation and QA/QC inspections. Clients include healthcare, industrial, government, schools, universities, architecture, engineering and construction firms.