California Code, Health and Safety Code - HSC § 25299.34

(a) The total liability of any guarantor under this chapter is limited to the aggregate amount which the guarantor has provided as evidence of financial responsibility to the owner or operator pursuant to this article. This section does not limit any other state or federal statutory, contractual, or common-law liability of a guarantor to its owner or operator, including, but not limited to, the liability of the guarantor for bad faith either in negotiating or in failing to negotiate the settlement of any claim.

(b) For the purposes of this section, “guarantor” means any person, including the insurance fund or the fund, other than the owner or operator, who provides evidence of financial responsibility for an owner or operator pursuant to Section 25299.31.