Cal. Lab. Code § 1403

An employer who fails to give notice as required by paragraph (2) of subdivision (a) of Section 1401 is subject to a civil penalty of not more than five hundred dollars ($500) for each day of the employer’s violation. The employer is not subject to a civil penalty under this section, however, if the employer pays to all applicable employees the amounts for which the employer is liable under Section 1402 within three weeks from the date the employer orders the mass layoff, relocation, or termination.