Here are some links provided for your reference:

PEI    Simplex    Ronan    Veeder-Root    Auto-Stik    Incon    UST Services

California Designated Operator Links:

www.swrcb.ca.gov/ust  Look for the form (owner statement of designated UST operator & understanding of requirements)

ICC Safe UST information Look for training info here!

State Water Resource Board Title 23 Study materials

Also check: UST Services