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Cal. Code Regs. Title 23, Division 3, Chapter 16, Underground Tank Regulations (10) A description of the proposed method(s) of repair or replacement of the primary and secondary containment. If this involves a change described in section 25286 of the Health and Safety Code, notification pursuant to that section shall be made. (11) A description of additional actions taken to prevent future releases. (d) Until investigation and cleanup are complete, the owner or operator shall submit reports to the local agency or Regional Water Quality Board, whichever agency is overseeing the cleanup, every three months or more frequently as specified by the agency. Reports shall include but not be limited to, an update of the required information in subsection (c), and the results of all investigation monitoring or other corrective actions which have occurred during the reporting period. Information required by sections 2653 and 2654 shall be submitted as part of the periodic report to the agency. (e) The owner or operator shall conduct all necessary initial abatement and site characterization actions as required by sections 2653 and 2654 and shall take additional corrective action as required by Article 11. (f) If the test results from either an investigation conducted under subsection (e) or from other procedures approved by the agency, fail to confirm that there has been an unauthorized release from the underground storage tank, no further investigation or corrective action is required. Authority: Sections 25299.3 and 25299.7, Health and Safety Code. Reference: Sections 25286, 25288 and 29295, Health and Safety Code; 40 CFR 280.52-280.53. § 2653. INITIAL ABATEMENT ACTION REQUIREMENTS. (a) Owners or operators required to conduct initial abatement in accordance with section 2652(e) shall comply with the following requirements: (1) Remove as much of the hazardous substance from the underground storage tank as necessary to prevent further release to the environment. (2) Visually inspect any above ground releases or exposed below ground releases and prevent further migration of the released substance into surrounding soils and ground water. (3) Continue to monitor and mitigate any additional fire and safety hazards posed by vapors or free product that have migrated from the un derground storage tank excavation zone and entered into subsurface structures, such as sewers or basements. (4) Remedy hazards posed by contaminated soils that are excavated or exposed as a result of release confirmation, site investigation, or abatement activities. If these remedies include treatment or disposal of soils, the owner or operator shall comply with applicable State and local requirements. (5) Investigate to determine the possible presence of free product. If free product is present, begin removal thereof in accordance with section 2655. Authority: Sections 25299.3 and 25299.7, Health and Safety Code. Reference: Section 25295, Health and Safety Code; 40 CFR 280.61 and 280.62. § 2654. INITIAL SITE CHARACTERIZATION REQUIREMENTS. (a) Owners or operators required to conduct initial site characterization in accordance with section 2652(e), shall comply with the requirements of this section. (b) The owner or operator shall promptly gather information about the underground storage tank site and the nature of the unauthorized release, including information obtained while confirming the release or completing initial abatement and free product removal. This information shall include, but is not limited to, the following: (1) Data on the nature and estimated quantity of release; -43-