Our Team

  • Dianna Phelps, Office Manager

    Dianna joined the Cactus Team in February 2006. She is in constant contact with our customers and our vendors. She manages the work calendar, makes contact with the regulatory community, prepares and sends testing reports and invoices to customers and keeps track of accounts payables. We receive many, many compliments from our customers about her caring and concern for them.

  •  William D. Guarniere, VP of Operations

    Bill, or as he is fondly known to many of our customers as Young Bill, is a founder of Cactus./UST. He joined the company when it was formed in August of 1989 the day that Cactus /UST commenced family business operations in August of 1989.

    Young Bill has been instrumental in training and developing staff members, directing daily operations for all of the field activities of the company and providing technical support to the staff.

    He is the face of our operations with our customers whether it be a question, a test, a monitor problem or a facility operations problem.

  • Robert Arriaga, Technician

    Description goes hereRobert joined Cactus in April of 2019. He is an experienced vehicle mechanic who has also worked as a supervisor that built vacuum and fracking trucks for oilfield services. He is fully trained to perform testing and inspection procedures

  • William J. Guarniere, Technician

    Will joined Cactus in April of 2020. He brings us a degree from TCU University. computer knowledge, schooling in aeronautics and is fully trained to perform all testing and inspections according to TCEQ rules and regulations.