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Section 17772 . Decommissioning of Environmental control Systems (a) The operator shall ensure that components of environmental control systems, which have come into contact with leachate or landfill gas, and which are dismantled at the time of closure or during the postclosure period and are not intended for reuse are: (1) disposed of within the waste deposit area of the landfill, in accordance with the approved final closure plan; or (2) legally transported to and disposed of at another solid waste facility which is approved for receipt of such materials. Transportation and disposal should be accomplished in such a manner that prevents the introduction of gas condensate, leachate or waste constituents to the environment beyond the site boundary. (b) Dismantled environmental control systems which are intended for reuse at another facility shall be cleaned prior to removal. (1) The methods of cleaning, proposed by the operator in the preliminary and final closure plan, and approved pursuant to Chapter 5, Article 3.4 , Section 18271, may include but are not limited to one or more of the following methods: (A) washing with water, detergents or chemical solvents; (B) steam cleaning; (C) scrubbing with abrasives; and (D) sand blasting. (2) Residues produced as a result of these cleaning procedures shall be disposed of in accordance with applicable federal, state, and local laws. NOTE: Authority cited; Sections 40502 and 43020, Public Resources Code, and 66796. 22 (d) , Government Code. Reference: Sections 43021, Public Resources Code, and 66796.22 (d) , Government Code. Section 17773. Final cover (a) The final cover shall be designed by a registered civil engineer or certified engineering geologist. (b) A minimum thickness and quality of cover material, in accordance with Title 23 , CCR, Subchapter 15, Section 2581(a) , shall be placed over the entire surface of the final lift as the site reaches final configuration. The time period allowed for final cover after placement of the final lift shall in. no event exceed 15 months unless otherwise approved by the local enforcement agency, the regional water board, and the Board. (c) Engineered alternatives to the prescriptive standard under Subsection (b) shall only be approved when the operator demonstrates, to the satisfaction of the Board and local enforcement agency, that: (1) The prescriptive standard is not feasible as provided in Subsection (d) of this section, and (2) There is a specific engineered alternative that: I11 7 .8--.13 .46/18/90) .