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Article If. Commingled Plume Account G� • ' I UI 25299.90. The Legisiat•hereby finds and declares all of the fllowing:' (a) Commingled plumes of petroleum contaminated groundwater involve serious water quality impa (b) Unauthorized releases from underground storage tanks are a major source of commingled plumes of petroleum contaminated groundwater. (c) Unless corrective action is performed in a coordinated manner, remedial action of commingled plumes may be ineffective. (d) Disagreement over shared liability among parties responsible for underground storage tank leaks which contributed to commingled plumes may result in substantial expenditures for legal costs and the expense of necessary cleanup. (e) Reimbursing claimants jointly will result in more efficient cleanups, lower total corrective action costs, and reduced legal costs for commingled plumes. 25299.91. As used in this article, the following terms have the following meaning: (a) 'Commingled plume'means the condition that exists when groundwater contaminated with petroleum from two or more discrete unauthorized releases have mixed or encroached upon one another to the extent that the corrective action performed on one plume will necessarily affect the other. A commingled plume does not include either of the following: (1) Contaminated groundwater plumes resulting from unauthorized releases or discharges from a single site. (2) Soil contamination, unless it can be demonstrated that the contaminated soil is an immediate threat to groundwater. (b) 'Contributing site'means a site on which an unauthorized release or discharge of waste has occurred or is occurring and has impacted or threatens to impact groundwater. 25299.92 A sum not to exceed ten million dollar;($10,000,000) from Item 3940-0010439 of the Budget Act of 1996 shall be available for expenditure for the 1996-97 fiscal year for the purposes of this article. In subsequent fiscal years, it is the intent of this Legislature that an appropriation be made in the annual Budget Act to carry out this article. 25299.93. (a)A joint claim may be submitted for reimbursement of corrective action costs for a commingled plume if all of the following conditions are met: (1) Each person named in the joint claim is an owner,operator,or other responsible party ordered to perform corrective action or remedial action pursuant to this chapter, Chapter 6.7(commencing with Section 25280), or Division 7(commencing with Section 13000)of the Water Code. (2) After performing a soil and water investigation in accordance with Article 11 (commencing with Section 2720) of Chapter 16 of Division 3 of Title 23 of the California Code of Regulations, the joint claimants demonstrate to the satisfaction of the local or regulatory agency and the board that a commingled plume exists and that every identified unauthorized release or discharge has contributed substantially to the commingled plume. (3) At least 85 percent of the commingled plume is comprised of petroleum contamination resulting from an unauthorized release from a tank whose owner or operator is eligible for payment of a claim pursuant to Section 25299.54 . (4)At least two contributing sites involve an unauthorized release. (5)The joint claimants have coordinated corrective action as soon as practicable. (6) The joint claimants agree to seek preapprovai of corrective action costs in accordance with subdivision (c) of Section 25299.57. (7) The joint claimants have entered into a written agreement that provides for a coordinated corrective action plan. The written agreement shall require the joint claimants to do the following: (A)Appoint one of the joint claimants to represent the joint claimants for purposes of interacting with the local or regulatory agency and the board. (B) Permit the joint claimants reasonable access to contributing sites as necessary to perform corrective action. (C) Identify any corrective action costs incurred at contributing sites and assess if any of those costs may be eligible for reimbursement under this chapter. (D) Estimate responsibility among the joint claimants and provide a formula or method for apportioning costs that are not eligible for reimbursement under this chapter or which exceed the limitations prescribed in Section 25299.94. (E) Identify all money or other compensation received by any joint claimant which is related to contamination at any contributing site or the commingled groundwater plume. (b) A joint claim may be submitted for reimbursement of third parties as provided in Section 25299.58 subject to both of the following conditions: (1) The conditions set forth in subdivision (a) are satisfied. (2) An owner or operator named in the joint claim is liable for a third-party compensation claim. I.