SITE INFORMATION AND CORRESPONDENCE

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20 V. CLOSURE 1 . Closure. The owner or operator shall close his facility in a manner that: (a) minimizes the need for further maintenance, and (b) controls, minimizes or eliminates, to the extent necessary to protect human health and the environment, post-closure escape of hazardous waste, hazardous waste constituents, leachate, contaminated rainfall , or waste decomposition products to the ground water, or surface waters, or to the atmosphere. 2. Closure plan and amendment of plan. (a) The owner or operator shall have a written. closure plan. This plan shall be subject to approval by the California Regional Water Quality Control Board and shall be kept at the facility. This plan shall identify the steps necessary to close the facility completely at any point during its intended life and at the end of its intended life. The closure plan shall include, at least : (1 ) A description of how and when the facility will be parti- ally closed, if applicable, and ultimately closed. The description shall identify the maximum extent of the operation which will be unclosed during the life of the facility, and how Item 1 and other applicable conditions of this document will be met; (2) An estimate of the maximum inventory of wastes in storage or in treatment at any given time during the life of the facility; (3) A description of the steps needed to decontaminate facility equipment during closure; and (4) A schedule for final closure which shall include, as a minimum, the anticipated date when wastes will no longer be received, the date when completion of final closure is anticipated, and intervening milestone dates which will allow tracking of the progress of closure. (For example, the expected date for completing treatment or disposal of waste inventory shall be included, as must the planned date for removing any residual wastes from storage facilities and treatment processes. )