Since 1947, National Underground Group, formerly known as Hoffman Southwest Corp., has provided a full spectrum of services to maintain healthy underground infrastructures. Today, through our family of businesses, Pro-Pipe, Tri-State Utilities, Accumark, Pipe Vision and Benchmark, National Underground Group is focused on providing underground infrastructure solutions to municipalities, utilities, government agencies, construction companies and engineering firms throughout the U.S.  

Construction

Utilities

National Underground Group

National Underground Group's headquarters in Irvine, CA, United States

The office at 2100 N Hamilton St serves as a financial hub, focusing on accounting and financial management services.

2100 N Hamilton St

2111 Smith Ave serves as a key hub for HR activities, fostering employee relations and strategic workforce planning.

2111 Smith Ave

Dale Ambrosini

Brenda Coburn

Evangeline Lorenzo

Hajra Zigic

The Human Resources Team at National Underground Group is responsible for managing employee relations, recruitment, and talent development across the organization. They ensure compliance with labor laws, oversee payroll processes, and provide strategic HR support to align workforce initiatives with the company's goals in delivering underground infrastructure solutions. By fostering a positive work environment, the team plays a critical role in enhancing employee engagement and organizational effectiveness.

Human Resources Team

This department is responsible for overseeing safety protocols and risk management within the organization.

National Underground Group

Org chart

Teams

Human Resources Team

Safety Management

Offices

National Underground Group

Org chart

Teams

Human Resources Team

Safety Management

Offices

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