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may be used to No'rE Authority cited:Section 1058,Water Code.Reference:Section 13172
<br /> assurances of financial responsibility,these assurances y t} ,
<br /> fulfill the requirement under subsection(f)of this section,provided that: Water Code.
<br /> (1)the regional board approves the assurance,and §2581. Landfill Closure Requirements.
<br /> (2)the regional board is named as alternate payee. (a)Final Cover requirements:
<br /> (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-
<br /> board determines that water quality aspects of reclamation are complete propriate materials as a foundation layerforthe final cover.These materi-
<br /> and waste no longer poses a threat to water quality. als may be soil,contaminated soil,incinerator ash,or other waste materi-
<br /> (i)Vegetation forclosed mining waste management units shall not im- als,provided that such materials have appropriate engineering properties
<br /> pair the integrity of containment features.Irrigation of vegetation shall to be used for a foundation layer.The foundation layer shall be com-
<br /> not cause nor increase the production of leachate.6)New and existing patted to the maximum density obtainable at optimum moisture content
<br /> Group A and B waste piles shall be closed in accordance with the provi- using methods that are in accordance with accepted civil engineering
<br /> sions of Subsections 2581(a),(b),and(c)of this subchapter. practice.A lesser thickness may be allowed for waste management units
<br /> (k)New and existing Group A and B surface impoundments shall be if,the regional board fords that differential settlement of waste.and ulti-
<br /> closed in accordance with the provisions of Subsections 2582(a) and mate land use will not affect the structural integrity of the final cover.
<br /> (b)(I)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
<br /> 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
<br /> if the liner,or outer liner of a double liner system,is clay. compacted to attaint a permeability of either Ix10-6c-1—or Less,or equal
<br /> (I)New and existing Group A and B tailings ponds shall be closed in to the permeability of any boaom liner system or underlying natural geologic
<br /> accordance with the provisions of Subsections 2581(a),(b),and(c)and materials, whichever is less.Permeability determinations for cover materials
<br /> Subsection 2582(a)of this subchapter. shall be as specified in Article 4 of this atbehapter and shall be appended to the
<br /> (m)New and existing Group C training waste management units shall closure and maintenance report
<br /> be closed in a manner that will minimize erosion and the threat of water
<br /> (3)Closed landfills shall be provided with not less than one foot of soil,
<br /> quality degradation from sedimentation.
<br /> Norm Authority cited:Section 1058,Water Code.Reference:Sections 13172, containing no waste or leachate,placed on top of the material described
<br /> 13226 and 13263,Water Code. in subsection(a)(2)of this section;the rooting depth of any vegetation
<br /> planted on the cover shall not exceed the depth to the material described
<br /> Article 8. Closure and Post-Closure in subsection(a)(2)of this section.
<br /> (4)The cover shall be designed and constructed to function with the
<br /> Maintenance minimum maintenance possible.
<br /> (b)Grading requirements:
<br /> §2580. General Closure Requirements. (1)Closed landfills shall be graded and maintained to prevent ponding
<br /> (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-
<br /> agement units shall be in compliance with the provisions of this article. lowed if an effective system is provided for diverting surface drainage
<br /> If a unit has been partially closed in accordance with an approved closure from covered wastes.
<br /> plan by the effective date of these regulations,the cover over the closed (2) Areas with slopes greater than ten percent, surface drainage
<br /> portion does not need to be modified to conform to these regulations,un- courses,and areas subject toerosion by water and wind shall be protected
<br /> less monitoring data indicate impairment of beneficial uses of ground or designed and constricted to prevent such erosion.
<br /> water.Classified waste management units shall be closed according to (c)Throughout the post-closure maintenance period,the discharger
<br /> an approved closure and post-closure maintenance plan which provides shall:
<br /> for continued compliance with the applicable standards for waste con- (1)maintain the structural integrity and effectiveness of all contain-
<br /> tainment and precipitation and drainage controls in Article 4 of this sub- ment structures,and maintain the final cover as necessary to correct the
<br /> chapter,and the monitoring program requirements in Article 5 of this effects of settlement or other adverse factors;
<br /> subchapter,throughout the closure and post-closure maintenance period. (2)continue to operate the leachate collection and removal system as
<br /> The post-closure maintenance period shall extend as long as the wastes long as leachate is generated and detected;
<br /> pose a threat to water quality.For land treatment facilities,the postclo- (3)maintain monitoring systems and monitor the ground water,sur-
<br /> sure maintenance period shall extend until treatment is complete. face water,and the unsaturated zone in accordance with applicable re-
<br /> (b)Closure shall be under the direct supervision of a registered civil quirements of Article 5 of this subchapter,
<br /> engineer or a certified engineering geologist. (4)prevent erosion and related damage of the final cover due to drain-
<br /> (c)Class 11 waste management units and Class III landfills shall be age;and
<br /> closed in accordance with one of the following options: (5)protect and maintain surveyed monuments.
<br /> (1)landfill:pursuant to Section 2581 of this article; Nom- Authority cited Section 1059,Water Code.Reference:Section 13172,
<br /> (2)surface impoundment:pursuant to Section 2582 of this article;(3)
<br /> Water Code.
<br /> waste pile:pursuant to Section 2583 of this article;or §2582. Surface impoundment Closure Requirements.
<br /> (4)land treatment:pursuant to Section 2584 of this article. (a)All free liquid remaining in a surface impoundment at the time of
<br /> Td)Closed waste management units shall be provided with at least two closure shall be removed and discharged at an approved waste manage-
<br /> permanent monuments installed by a licensed land surveyor or a regis- ment unit.All residual liquid shall be treated to eliminate free liquid.
<br /> tered civil engineer,from which the location and elevation of wastes, (b)Following removal and treatment of liquid waste,impoundments
<br /> containment structures, and monitoring facilities can be determined shall be closed in one of two ways,as approved by the regional board:
<br /> throughout the post-closure maintenance period. (1)All residual wastes,including sludges,precipitates,settled solids,
<br /> (c)Vegetation for closed waste management units shall be selected to and linermaterials contaminated by wastes,shall be completelyremoved
<br /> require minimum irrigation and maintenance,and shall not impair the in- from the impoundment and discharged to an approved waste manage-
<br /> tegrity of containment structures including the final cover. went unit.Remaining containment features shall be inspected for con-
<br /> (f)The regional board shall require the discharger to establish an irre- Lamination and,if not contaminated,may be dismantled. Any natural
<br /> vocable closure fund or provide other means to ensure closure and post- geologic materials beneath or adjacent to the closed impoundment that
<br /> closure maintenance of each classified waste management unit in actor- have been contaminated shall be removed for disposal at an appropriate
<br /> dance with an approved plan. waste management unit.If,afterreasonable attempts to remove such con-
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