Grayson Cardoza Takes Over as Manager After Darrel Dietz Retires

Darrel Dietz Retires After Years of Leadership as Grayson Cardoza Steps Into Manager Role

Fresno, United States – May 10, 2026 / Tank Specialties of California /

Tank Specialties of California has announced the retirement of longtime manager Darrel Dietz and the promotion of Grayson Cardoza to the manager role, representing a leadership transition that maintains the company’s commitment to certified repair work, regulatory compliance, and reliable service for fleet operators and cargo tank customers.

Dietz played a significant role in establishing the company as a dependable resource for cargo tank inspection, repair, and customization across the Central Valley and surrounding areas. His tenure contributed to a reputation grounded in technical capability, operational consistency, and a thorough understanding of the industries the company serves.

Cardoza steps into the position with a clear focus on upholding those standards while guiding customers through certified repair services and compliance requirements. Tank Specialties continues to function as a single-source provider for cargo tank services, working in coordination with Advanced Emission to address both cargo tank systems and diesel emissions compliance needs.

Tank Specialties of California holds its R Stamp #9199 certification, which authorizes the company to carry out pressure system repairs in accordance with the National Board Inspection Code (NBIC). This certification is a requirement for repairs and alterations to pressure-retaining equipment, including cargo tank systems used across fuel, chemical, agricultural, and other transport sectors.

R Stamp welding confirms that repairs adhere to nationally recognized standards and are supported by thorough documentation and inspection oversight. For equipment subject to regulatory requirements and expected to remain in uninterrupted service, this level of certification carries practical importance.

Tank Specialties supports customers with:

Cargo tank inspection and testing
Certified R Stamp pressure system repairs
Tank repair and customization
Compliance support for DOT and safety requirements

Drawing on decades of combined experience and a broad range of in-house capabilities, Tank Specialties serves customers across multiple industries with inspection, repair, fabrication, and compliance-focused services aimed at keeping equipment operating safely and efficiently.

To learn more about R Stamp welding services or to schedule an assessment, visit tankspecialtiesca.com or call (559) 579-1450.

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About Tank Specialties of California: Tank Specialties of California provides cargo tank inspection, repair, and customization services for fleets and operators throughout Fresno, the Central Valley, and surrounding regions. As part of the RV Jensen family of companies, and in partnership with Advanced Emission, the company also supports diesel emissions compliance, Clean Truck Check testing, and related services, offering a comprehensive approach to fleet safety, performance, and regulatory requirements.