About Us

Who We Are
We serve the refining, petrochemical, midstream, pipeline, terminal, and marine industries. Whether a project is routine or complex, our approach is the same: assess the problem thoroughly, apply the right technology, and execute safely.
We operate as a mobile-first organization. Our treatment systems are self-contained, pre-permitted, and pre-engineered, which means we can mobilize to a customer facility quickly and begin operations without delay. Through our partnership with Evergreen Industrial Services, we have access to 21 locations across the United States for storage, staging, and support.
GEM employs engineers, scientists, and field professionals with deep experience in vapor control, water treatment, chemical cleaning, and HF alkylation services. We have in-house laboratory capabilities for treatability testing, and we work directly with regulatory agencies to obtain permits on behalf of our clients.

Our History
GEM Specialized Services was founded in 1994 with a focused mission: provide technically rigorous, mobile treatment solutions for industrial vapor control and water treatment. For more than 30 years, we have built our reputation on the strength of our people, our engineering capability, and our ability to show up when the work is critical.
In 2015, GEM became part of Evergreen Industrial Services, expanding our collective service line and allowing both organizations to take on a wider range of complex industrial projects. That partnership remains strong today. In 2026, GEM has re-established itself as a focused, independent operation, channeling our expertise into the specialized services where we do our best work, while continuing to collaborate with Evergreen on shared opportunities.
Affiliated Companies
GEM Specialized Services has a unique advantage when it comes to providing turnkey solutions. Through our partnerships with Evergreen Industrial Services and the Stronghold Companies, we can assist in securing additional contractors for all of your turnaround, capital, and maintenance needs.

The specialized industrial and environmental services provided by Evergreen Industrial Services are the highest quality available today. Whether you require services for large scale industrial outages or field services smaller in scope, Evergreen Industrial Services believes that the approach to any project must be safe, environmentally sound and cost effective. Our comprehensive knowledge and results oriented approach have earned them a reputation of excellence in the industry.

Cat-Spec, Ltd. (CSL) is the leader in turnkey catalyst handling services with decades of management and field experience providing unsurpassed knowledge and performance.

Elite Turnaround Specialists, Ltd. (ETS) provides complete turnaround and fabrication services with the highest skilled crafts and a custom-designed equipment fleet ready to handle the needs of each individual client.

Specialty Tank Services, Ltd. (STS) specializes in the maintenance, repair, design, fabrication, and field erection of above-ground storage tanks. STS utilizes complete API 650/620/653 standards along with in-house engineering and design services.

Established in 2009, Stronghold Inspection, Ltd. (SHI) is the premier inspection company that provides turnaround services, on-stream inspection, specialty NDE, vendor surveillance, rope access, and inert inspection.

Turnkey I&E, Ltd. (TKIE) is an industrial instrumentation and electrical services company which provides maintenance, turnaround support, and capital project services.

Stronghold Tower Group, Ltd. (STG) is a specialized company with highly trained craft that perform construction and turnaround services for optimized tower performance.
