GTS is an Arizona-based engineering firm serving projects across Arizona and the broader Southwest. Since 1998, our professional engineers and field technicians have supported owners, builders, architects, and contractors with site assessments, construction materials testing (CMT), and special inspections.
Founded in 1998, GTS combines local field expertise with accredited laboratory testing to deliver clear recommendations. From due diligence to construction, our focus is quality, responsiveness, and client service – so your project stays on schedule and in compliance.
GTS is a family-owned materials testing lab and geotechnical firm led by geotechnical engineer Courtney Arviso with co-owner Lori Arviso. Over 25+ years, we’ve grown into a trusted partner on site developments, military facilities, and various public and private projects across Arizona. Our team pairs on-site experience with robust laboratory capabilities, bringing proven processes and clear communication to every project.
We support builders, contractors, architects, public and private agencies, and owners across residential, commercial, and infrastructure work. Whether you need a geotechnical report, testing and inspection, or third-party verification, our scope aligns to your risk, timeline, and budget.
We primarily serve Yuma, Phoenix, and the greater Southwest region. If your project lies outside Arizona, we provide mobilization nationwide.
