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/ T[.r 27 Combined SWRCB/CIWMB Regs, .60- 21180 1 (4)a statement that the future site use is restricted in accordance proposed modification or replacement of the low permeability layer 2 with the postclosure maintenance plan, of the final cover shall begin upon approval by the EA,and the 3 ROTE: Auftwityeked:Sections 40502 and 430211,Public RWQCB. 4 Resources Cade and Seetlon s6T96.224d),Government Code. (e)Construction of structural improvements on top of landfilled Reference:Section 44100 and 43103, Public Resources;and areas during the postelosture period shall meet the following tion 667%22(d),Geverrinnent Cods, conditions. (1)automatic methane gas sensors,designed to trigger an audible §21180. CIWMB-Postelosnre Maintenance.(TI 4;§17788) alarm when methane concentrations are detected,shall be installed in (Water quality protection aspects for porrclosure maintenance are all buildings; 9 addressed in§21090.] (2)enclosed basement constr:ctkm is prohibited: 10 (a)Postclosure maintenance for the purposes of reducing impacts (3)buildings shall be constructed to mitigate the effects of gas 11 to health and safety,shall be conducted to encore the integrity of the elation,which may include an active gas collection or passive 12 final cover and environmental control systems. The landfill shall be vent systems; 13 maintained and monitored for a period of not less than thirty(30) (4)buildings and utilities shall be constructed to mitigate the 14 years after the completion of closure of the entire solid waste effects of differential settlement. All utility connections shall be 15 landfill. Any areas in which final cover is placed prior to the closure designed with flexible connections and utility collars; 16 of the entire landfill shall be maintained in accordance with an (5)utilities shall not be installed in or below any low 17 approved postclosure maintenance plan,but the thirty(30)year permeability layer of final cover, 18 monitoring period shall not convocnce until closure of the entire (b)pilings shall not be installed in or through any bottom liner 19 landfill is complete. Maintenance and monitoring shall include,but unless approved by the RWQCB. 2not limited the fallowing: (7)if pilings are installed in or through the low permeability 211 (1(1)site security; 22 (2)gas monitoring and control system maintenance as specified layer of final cover,then the low permeability layer must be replaced 23 in the final closure and postclosure maintenance plans. or repaired;and (8)periodic tncthanc gas monitoring shall be conducted inside all 24 (b)Ifnonliquid waste is exposed during postclosure maintenance buildings and underground utilities in accordance with§20933 of 26 activities at a solid waste landfill,the waste may be returned to that 26 landfill provided that the inte "of the final rover is maintained. Article 6,of Subchapter 4 of this Chapter. ff 27 (c)The operator shall provide to the CIWMB and the EA copies (f)The may require that additional soil layer or building 28 of the maps and reports provided to the RWQCB pursuant pad be placeedd n the final cover prior construction to protect the sn 29 to§21090(e)(2)describing the amount of differential settlement integrity and function of the various layers of final cover. --->-30 NOTE; Authority cited:Sections 40502 and 43020,Public '(g)All°n-site construction wittrin 1,000 feet of the boundary of 31 Resources Code;and Section 66796(d),Government Code. any disposal area shall be designed and constructed in accordance 32 Reference:Section 43021 and 43103, Putrllc Resources Code; with the following,or in accordance with an equivalent design which 33 and section 66796.22(41.Goverranent Cade will prevent gas migration into the building,unless an exemption has been issued: 34 §21190. CIWMB-Postclosure Land Use.(T14:§17796) (1)a geomembrane or equivalent system with low permeability 35 (a)Proposed posiclosure land uses shall be designed and to landfill gas shall be installed between the concrete floor slab of 36 maintained to: the building and subgrade; 37 (1)protect public health and safety and prevent damage to (2)a permeable layer of open graded material of clean aggregate 38 structures,toads,utilities and gas monitoring and control systems; with a minimum thickness of 12 inches shall be installed between the 39 (2)prevent public contact with waste,landfill gas and leachate; g'eomembrane and the subgrade or slab; 40 and (3)a gootextile filter shail be utilized to prevent the introduction 41 (3)prevent landfill gas explosions. of fines into the permeable layer, 42 (b)The site design shall consider one or more proposed uses of (4)perforated venting pipes shall be installed within the 43 the site toward which the operator will direct its efforts,or shall pemucable layer,and shall be designed to operdtc without clogging: 44 show development as open space,graded to harmonize with the (5)the venting pipe shall be constructed with the ability to be 45 setting and landscaped with native-shrubbery or low mainterrarrce connected to an induced-draft exhaust system- 46 ground cover. (6)automatic methane gas sensors shall be installed within the 47 (c)All proposed postclosure land uses,other than non-irrigated permeable gas layer,and inside the building to trigger an audible 48 open space,on sites implementing closure or on closed sites shall be alp'when methane gas concentrations are detected:and 49 submitted to the EA.RWQCB,local air district and local land use (7)periodic methane gas monitoring shalt be conducted inside all 50 agency. The EA shall review and approve proposed postclosure land buildings and underground utilities in accordance with Article 6.of 51 uses if the project involves structures within 1,000 feet of the Subchapter 4 of this chapter(§20920 et seq.). 52 disposal area,structures on top of waste,modification of the low NOTE- Auttta ltycited:Sections 40502 and 43020,Public 53 permeability layer;or irrigation over waste. Resources Cod*;and Settlor[ 66796.22(4).Gaverwment Code. 54 (d}Construction on the site shall maintain the integrity of the Reference:Sections 43021,43113 and 44105,Public Resources Code;and Section 68M.22(d),Government Code. 55 final cover,drainage anderosion cowtrol system,and gas 56 monitoring and control systems.The owner or operator shall §21194. (Reserved by SWRCB] 57 demonstrate to the satisfaction of the EA that the activities will not 58 pose a threat to public health and safety and the environment. Any Effective Date:7!16!97 SaWiv 1 ll Ch 3//Subch.5(Closure&P-Cl M.)/l Art.2(Suds for Us)