CA Health & Safety Code Section 25160.4

(a)

On and after January 1, 2005, and except as provided in subdivision (b), if an offsite hazardous waste facility operator either rejects a partial shipment of hazardous waste, or rejects an entire shipment of hazardous waste after signing the manifest accompanying the shipment, the facility operator shall prepare a new manifest to accompany the rejected hazardous waste when it is returned to the generator or shipped to an alternate facility designated by the generator.

(b)

To the extent that the United States Environmental Protection Agency adopts regulations under the federal act that preempt or are more stringent than the requirements of this section, an offsite hazardous waste facility, generator, and transporter shall instead comply with those regulations on and after the date those federal regulations become effective in California, or on and after the effective date of regulations adopted by the department in accordance with those federal regulations, whichever date occurs first.