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Table 4.1 Construction Standards for Units

27 CA ADC Div. 2 Subd. 1 Ch. 3 Subch. 2 Art. 4 Tbl. 4.1Barclays Official California Code of Regulations

Barclays California Code of Regulations

Title 27. Environmental Protection

Division 2. Solid Waste (Refs & Annos)

Subdivision 1. Consolidated Regulations for Treatment, Storage, Processing or Disposal of Solid Waste

Chapter 3. Criteria for All Waste Management Units, Facilities, and Disposal Sites

Subchapter 2. Siting and Design

Article 4. SWRCB--Waste Management Unit Construction Standards

27 CCR Div. 2 Subd. 1 Ch. 3 Subch. 2 Art. 4 Tbl. 4.1

Table 4.1 Construction Standards for Units

Currentness

Table 4.1. Construction Standards for Units⁽¹⁾

						Subsurface	Barriers
Waste Mgmt Unit Classification	Type of Waste Management Unit	Clay Liner⁽²⁾	Synthetic Liner	Leachate Collection and Rem. System	Interim Cover	Cutoff Walls	Grout Curtains	Capacity of Precip & Drain. Control Facilities (Design Storm)	Seismic Design
Class II	Non MSW Landfill	Required⁽⁵⁾, ≤1x10^-6cm/sec	Not required	Required, blanket type	Required	≤1x10^-6 cm/sec⁽¹¹⁾	≤1x10^-6 cm/sec	1000-year 24-hour precipitation	Withstand maximum credible earthquake
Class II	MSW Landfill⁽¹³⁾	Special⁽¹³⁾	Special⁽¹³⁾	Special⁽¹³⁾	Required	≤1x10^-6 cm/sec⁽¹¹⁾	≤1x10^-6 cm/sec	1000-year 24-hour precipitation	Withstand maximum credible earthquake
Class II	Surface Impoundment	Double or single required⁽⁶⁾, ≤1x10^-6 cm/sec	Not required	Required with double liner, blanket type	Not required	≤1x10^-6 cm/sec⁽¹¹⁾	≤1x10^-6 cm/sec	1000-year 24-hour precipitation	Withstand maximum credible earthquake
Class II	Waste Pile	Optional^(4,5), ≤1x10^-6 cm/sec	Not required	May be required, blanket type	May be required	≤1x10^-6 cm/sec⁽¹¹⁾	≤1x10^-6 cm/sec	1000-year 24-hour precipitation	Withstand maximum credible earthquake
Class III	Non MSW Landfill	Optional, ≤1x10^-6cm/sec (see § 20260)	Not required	Required if liner is required, blanket or dendritic	Required	≤1x10^-6 cm/sec, if required	≤1x10^-6 cm/sec, if required	100-year 24-hour precipitation	Withstand at least the maximum probable earthquake (See § 20370)
Class III	MSW Landfill⁽¹³⁾	Special⁽¹³⁾	Special⁽¹³⁾	Special⁽¹³⁾	Required	≤1x10^-6 cm/sec, if required	≤1x10^-6 cm/sec, if required	100-year 24-hour precipitation	Withstand at least the maximum probable earthquake (See § 20370)

¹ Applicable regulations in this article may provide for exemptions to certain requirements. § 20310(d) describes applicability to existing facilities.

² All permeabilities specified in this table are maximum allowable permeabilities.

³ [Reserved.] Note: This footnote left in Ch-15 (of Division 3, Title 23, CCR), as it applies only to Class I Units.

⁴ A synthetic liner alone may be allowed based on nature of waste to be contained and duration of the operation. A waste pile with a synthetic liner alone may not be closed as a landfill pursuant to § 21410 of this subchapter. The synthetic liner hydraulic conductivity shall be the same or less than that which would be required for a clay liner.

⁵ Clay liner required unless Units are underlain by a substantial thickness of natural geologic materials with hydraulic conductivity of 1x10^-6 cm/sec [i.e., 1 foot/year] or less.

⁶ Single liner shall be a clay liner and removed or replaced as described in § 20330. Double liner systems shall have either an outer clay liner or shall be underlain by a substantial thickness of natural geologic materials with an hydraulic conductivity of 1x10^-6 cm/sec [i.e., 1 foot/year] or less to act as an outer liner.

⁷ [Reserved.]

⁸ [Reserved.]

⁹ [Reserved.]

¹⁰ [Reserved.]

¹¹ Cutoff walls required where there is potential for lateral movement of fluid, including waste or leachate, and the hydraulic conductivity of natural geologic materials is used for waste containment.

¹² For Units other than MSW landfills, the RWQCB can grant an exemption to this design storm requirement if the discharger can demonstrate that the integrity of facilities will not be jeopardized if this criterion is not met.

¹³ All Class II or Class III landfills that received MSW at any time and that received solid waste after October 9, 1991 (MSW landfills) are subject to the additional state and federal requirements contained (or incorporated by reference) in SWRCB Resolution No. 93-62.

Image 1 within Table 4.1 Construction Standards for Units

Footnotes for Figure 4.1: Summary of Liner Requirements for Classified Units (for MSW Landfills, see Additional Requirements in SWRCB Resolution No. 93-92).

^a Requirements from Chapter 3, Subdivision 1 of this division.

^b Designed to convey twice the anticipated volume of leachate; must ensure no buildup of hydraulic head on liner; blanket type required unless otherwise specified.

^c Minimum 40 mils thick.

^d Must be compatible with waste and/or leachate.

^e Cutoff walls required where potential exists for lateral movement of waste or leachate.

^f Acceptability of synthetic liner depends on nature of waste and duration of operation.

^g Liner and waste to be removed at closure.

^h Substantial thickness of natural geologic material with maximum hydraulic conductivity of 1x10^-6 cm/sec (i.e., 1.0 foot/year). For MSW landfills, see SWRCB Resolution No. 93-62 for superseding containment system requirements.

ⁱ Minimum thickness of 2 feet; maximum hydraulic conductivity of 1x10^-6 cm/sec (i.e., 1.0 foot/year). For MSW landfills, see SWRCB Resolution No. 93-62 for superseding containment system requirements.

^j Liner removed or replaced before lower 25% (minimum 1 foot thickness) of the liner is penetrated by waste or leachate.

^k Soil characteristics, distance from waste to ground water, and other factors must ensure no impairment of beneficial uses of ground water. Leachate collection system required for sludge disposal. For MSW landfills, see SWRCB Resolution No. 93-62 for superseding containment system requirements.

^l Minimum thickness of 1 foot; maximum hydraulic conductivity of 1x10^-6 cm/sec (i.e., 1.0 foot/year). For MSW landfills, see SWRCB Resolution No. 93-62 for superseding containment system requirements.

^m Dendritic system allowed if wastes in contact with the liner will remain permeable and liner is sloped toward the system to prevent ponding. For MSW landfills, see SWRCB Resolution No. 93-62 for superseding containment system requirements.

This database is current through 4/26/24 Register 2024, No. 17.

Cal. Admin. Code tit. 27, Div. 2 Subd. 1 Ch. 3 Subch. 2 Art. 4 Tbl. 4.1, 27 CA ADC Div. 2 Subd. 1 Ch. 3 Subch. 2 Art. 4 Tbl. 4.1

End of Document