Soil Essentials, 201 N 6th St, Rockford, IL 61107, US

Testing Service Corporation is a professional firm that provides a variety of services in the geotechnical engineering, construction materials testing and environmental fields. The company is headquartered in Carol Stream, Ill., and has completed more than 71,000 projects throughout north and central Illinois. Its projects include residential developments, regional shopping centers, rail and cargo off-loading facilities, office buildings, and professional sports complexes, airports, expressways, bridges and tunnels. The company offers slope stability and settlement analysis, pile load testing, pavement design, in-place nuclear density measurement, and batch plant inspection and testing services. It also provides subsurface exploration, site assessment, closure monitoring, regulatory agency reporting, and tank removal and remediation services. Testing Service Corporation has been operational since 1954 and maintains a location in DeKalb, Ill.