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CCR, TITLE 23, DIVISION 3,CHAPTER 16, UNDERGROUND STORAGE TANK REGULATIONS CCR, TITLE 23, DIVISION 3, CHAPTER 16,UNDERGROUND STORAGE TANK REGUTATIONS time, based on available information. This written notice shall constitute the underground storage tank is or was located: agency concurrence on the completed corrective action. (1) for proposed activities under the Preliminary Site Assessment Phase,if Authority: H&SC Section 25299.77 directed by the regulatory agency;and Reference: H&SC Sections 25299.37, 25299.54, 25295, and 25298 and 40 CTR (2) before initiating any work in accordance with Sections 2725 and 2727 of Section 280.67 this Article. 2722. Scope of Corrective Action (d) The workplan shall include the proposed actions and a proposed schedule for their completion. The responsible patty shall modify the workplan, as (a) Corrective action includes one or more of the following phases: necessary,at the direction of the regulatory agency. r (1) Preliminary Site Assessment Phase (e) In the interest of minimizing environmental contamination and promoting (2) Soil and Water Investigation Phase; prompt cleanup,the responsible party may begin implementation of the (3) Corrective Action Pian Implementation Phase;and proposed actions after the workplan has been submitted and before it has (4) Verification Monitoring Phase. received agency concurrence. Implementation of the workplan may begin sixty (60)calendar days after submittal,unless the responsible party is otherwise (b) The responsible party shall take or contract for Interim remedial actions, as directed in writing by the regulatory agency. Before beginning these activities, necessary,to abate or correct the actual or potential effects of an unauthorized the responsible party shall: release. Interim remedial actions can occur concurrently with any phase of corrective action. Before taking interim remedial action, the responsible party shall notify the regulatory agency of the proposed action and shall comply with (1) notify the regulatory agency of the intent to initiate the proposed actions any requirements that the regulatory agency sets. Interim remedial actions included in the workplan submitted;and Include,but are not limited to, the following: (2) comply with any conditions set by the regulatory agency, Including (1) removal of free product. Free product removal must comply with the mitigation of adverse consequences from cleanup activities. applicable provisions of Section 2655 of Article 5; Authority: H&SC Section 25299.77 (2) enhanced biodegradation to promote bacterial decomposition of Reference: H&SC Sections 25295, 25297, 25299.14, 25299.37, 25299.78, and 40 CFR contaminants; Sections 280.53, and 280.60 through 280.66, and Section 13267 of the Water Code 1 (3) excavation and disposal of contaminated soil; 1 (4) excavation and treatment of contaminated soil; 2723. Preliminary Site Assessment Phase (5) vacuum extraction of contaminants from soil or groundwater;and (a) The Preliminary Site Assessment Phase includes,at a minimum, initial site investigation,initial abatement actions and initial site characterization in (6) pumping and treatment of ground water to remove dissolved accordance with Sections 2652, 2653, and 2654 of Article 5 and any interim contaminants. remedial actions taken in accordance with Section 2722(b)of this Article. (c) The responsible party shall submit a workplan to the regulatory agency (b) Implementation of any of the interim remedial actions or any of the activities responsible for overseeing corrective action at the underground storage tank included in the Preliminary Site Assessment Phase shall constitute initiation of site,under the conditions listed below. If no regulatory agency has assumed corrective action. responsibility for overseeing corrective action, the responsible party shall submit the workplan to the regional board with Jurisdiction for the site where Authority: H&SC Section 25299.77 11-4 it-3