Cal. Health & Safety Code § 25297.1
(a)
(d) The board shall adopt administrative and technical procedures, as part of the state policy for water quality control adopted pursuant to Section 13140 of the Water Code, for cleanup and abatement actions taken by a local agency with which the board has entered into an agreement pursuant to this section. The procedures shall include, but not be limited to, all of the following:
(e) Any agreement between the regional board and a local agency to carry out a local oversight program pursuant to this section shall require both of the following:
(g)
(i)
(1) For purposes of this section, site-specific oversight costs include only the costs of the following activities, when carried out by the staff of a local agency or the local agency’s authorized representative, that are either technical program staff or their immediate supervisors:
(4)
(5) In recovering costs from responsible parties for costs incurred under this section, the local agency shall prorate any costs identifiable as startup costs over the expected number of cases that the local agency will oversee during a 10-year period. A responsible party who has been assessed startup costs for the cleanup of any unauthorized release that, as of January 1, 1991, is the subject of oversight by a local agency, shall receive an adjustment by the local agency in the form of a credit, for the purposes of cost recovery. Startup costs include all of the following expenses: