To obtain a permit the following need to be provided to DMV:
• A completed application form (DMV 706 MCP)
• Proof of financial responsibility (DMV 65 MCP)
• Proof of Workers’ Compensation insurance or signed exemption
• A valid Requestor Code issued by the Employer Pull Notice Program (EPN) if you employ drivers with a Commercial Class A, B, or C driver license with a hazardous materials endorsement. For forms or additional information on EPN, you may contact the EPN Unit at (916) 657-6346 or get more information about the Employer Pull Notice Program.
• A Carrier Identification number (CA#) issued by the CHP
• Payment of fees
Starting January 31, 2005, new federal regulations require a person who is applying for a California commercial driver license with an original Hazardous Materials (HazMat) endorsement to undergo a security threat assessment. The USA Patriot Act requires the Transportation Security Administration (TSA) to complete a security threat assessment (background records check) before the Department of Motor Vehicles issues a HazMat endorsement.
Excerpt from State of California DMV website.
To get all the information, here is a link to that site: Motor Carrier Permit