(a) The department shall report to the Governor and the Legislature on the progress of the cleanup of the San Gabriel Valley groundwater sites in the County of Los Angeles, and on the progress of enforcement actions relating to those sites, in the biennial report specified in Section 25178. The report shall include, but not be limited to, all of the following:
(1) State expenditures and planned expenditures.
(2) Actions accomplished at the sites.
(3) Actions planned, including a time schedule for the accomplishment of planned actions.
(b) The report may be prepared in cooperation with other state and federal agencies involved with the sites, and shall include a summary of the activities of those additional agencies.