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assurances of financial responsibility,these assurances may be used to Nom Authority cited Section 1058.Water Code. Reference:Section 13172, fulfill the requirement under subsection(f)of this section,provided that: Water Code. (1)the regional board approves the assurance,and §2581. Landfill Closure Requirements. (2)the regional board is named as alternate payee. (a)Final Cover requirements: (h)The post-closure maintenance period shall end when the regional (1)Closed landfills shall be provided with not less than two feet of ap- ard determines that water quality aspects of reclamation are complete propriate materials as a foundation layer forthe final cover.These matcri. waste no longer posts a threat to water quality. als may be soil.contaminated soil,incinerator ash,or other waste materi- (i)Vegetation forclosed mining waste management units shall not im- als,provided that such materials have appropriate engineering properties pair the integrity of containment features.Irrigation of vegetation shall to be used for a foundation layer.The foundation layer shall be com- not cause nor increase the production of leachate.6)New and existing patted to the maximum density obtainable at optimum moisture content Croup A and B waste piles shall be closed in accordance with the provi- using methods that are in accordance with accepted civil engineering sions of Subsections 2581(x),(b),and(c)of this subchapter. practice.A lesser thickness may be allowed for waste management units (k)New and existing Group A and B surface impoundments shall be if the regional board finds that differential settlement of waste.and ulti- closed in accordance with the provisions of Subsections 2582(a) and mate land use will not affect the structural integrity of the final cover. (b)(1)of this subchapter.A surface impoundment may be closed in place (2)Closed landfills shall be provided with not less than one foot of soil if provided with a cover as in Subsection 2581(a)of this subchapter and containing no waste orleachate.placed on top of the foundation layer and if the liner.or outer liner of a double liner system,is clay. compacted to attain apermeability of either Ix10' sccorless.orequal (1)New and existing Group A and B tailings ponds shall be closed in to the permeability of any bottom liner system or underlying natural geologic accordance with the provisions of Subsections 2581(a).(b),and(c)and materials, whichever is less.Permeability determinations for cover materials Subsection 2582(a)of this subchapter. shall be as specified in Article 4 of this subchapter and shall be appended to the (m)New and existing Group C mining waste management units shall closure and maintenance repcm be closed in a manner that will minimize erosion and the threat of water (3)Closed landfills shall be provided with not less than one foot of soil,quality degradation from sedimentation. Noir•Authority cited:Section 1058,water Code.Reference:Sections 13172, containing no waste or leachate,placed on top of the material described 13- 6 and 13263.Water Code. in subsection(ax2)of this section;the rooting depth of any vegetation planted on the cover shall not exceed the depth to the material described Article 8. Closure and Post-Closure in subsection(ax2)of this section. (4)The cover shall be designed and constructed to function with the Maintenance minimum maintenance possible. (b)Grading requirements: §2580. General Closure Requirements. (1)Closed landfills shall be graded and maintained to preventponding (a)Partial or final closure of new and existing classified waste man- and to provide slopes of at least three percent.Lesser slopes may be al- agement units shall be in compliance with the provisions of this article. lowed if an effective system is provided for diverting surface drainage If a unit has been partially closed in accordance with an approved closure from covered wastes. by the effective date of these regulations,the cover over the closed (2) Areas with slopes greater them ten percent. surface drainage Wtioii does not need to be modified to conform to these regulations,un- courses.and areas subject to erosion by water and wind shall be protected 'Tess monitoring data indicate impairment of beneficial uses of ground or designed and constructed to prevent such erosion. water.Classified waste management units shall be closed according to (c)Throughout the post-closure maintenance period,the discharger an approved closure and post-closure maintenance plan which provides shall: for continued compliance with the applicable standards for waste con- (1)maintain the stnrctural integrity and effectiveness of all contain- tainment and precipitation and drainage controls in Article 4 of this sub- ment structures,and maintain the final cover as necessary to correct the chapter,and the monitoring program requirements in Article 5 of this effects of settlement or other adverse factors; subchapter.throughout the closure and post-closure maintenance period. (2)continue to operate the Icachatc collection and removal system as The past-closure maintenance period shall extend as long as the wastes long as leachate is generated and detected; pose a threat to water quality.For land treatment facilities,the postclo- (3)maintain monitoring systems and monitor the ground water,sur- sure axsure maintenance period shall extend until treatment is complete. face water,and the unsaturated zone in accordance with applicable re- (b)Closure shall be under the direct supervision of a registered civil quirements of Article 5 of this subchapter; engineer or a certified engineering geologist. (4)prevent erosion and related damage of the final cover due to drain- (c)Class H waste management units and Class III landfills shall be age;and closed in accordance with one of the following options: (5)protect and maintain surveyed monuments. (1)landfill:pursuant to Section 2581 of this article; No E- Authority cited:Section 1058,water Code.Reference:Section 13172, (2)surface impoundment:pursuant to Section 2582 of this article;(3) Water Code. waste pile:pursuant to Section 2583 of this article;or §2582. Surface Impoundment Closure Requirements. (4)land treatment:pursuant to Section 2584 of this article. (a)All free liquid remaining in a surface impoundment at the time of 1d)Closed waste management units shall be provided with at least two closure shall be removed and discharged at an approved waste manage- permanent monuments installed by a licensed land surveyor or a regis- ment unit.All residual liquid shall be treated to eliminate free liquid. tered civil engineer,from which the location and elevation of wastes, (b)Following removal and treatment of liquid waste,impoundments containment structures, and monitoring facilities can be determined shall be closed in one of two ways,as approved by the regional board: throughout the post-closure maintenance period. (1)All residual wastes,including sludges,precipitates,settled solids, (e)Vegetation for closed waste management units shall be selected to and liner materials contaminated by wastes,shall be completely removed require minimum irrigation and maintenance,and shall not impair the in- from the impoundment and discharged to an approved waste manage- tcgrity of containment structures including the final cover. ment unit.Remaining containment features shall be inspected for con- (f)The regional board shall require the discharger to establish an irre- tamination and,if not contaminated,may be dismantled. Any natural Oftable closure fund or provide other means to ensure closure and post- geologic materials beneath or adjacent to the closed impoundment that sure maintenance of each classified waste management unit in accor- have been contaminated shall be removed for disposal at an appropriate dance with an approved plan. waste management unit.If,afterrcasonabieattempts toremove suchcon- Page 110