Sections: 21650-21690, Article 3, 3-1, 3-2, Subchapter 3, Chapter 4, Title 27, California Code of Regulations.

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California Department of Resources Recycling and Recovery (CalRecycle)

Table 4.1. Construction Standards for Units⁽¹⁾

Waste Mgmt Unit Classification

Type of Waste Management Unit

Clay Liner⁽²⁾

Synthetic Liner

Leachate Collection and Rem. System

Interim Cover

Subsurface Barriers

Cutoff Walls Grout Curtains

Capacity of Precip. & Drain. Control Facilities (Design Storm)

Seismic Design

Class II

Non MSW Landfill

Required⁽⁵⁾, <=1x10^-6 cm/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

MSW Landfill⁽¹³⁾

Special⁽¹³⁾

Required

<=1x10^-6 cm/sec⁽¹¹⁾

<=1x10^-6 cm/sec

1000-year 24-hour precipitation

Withstand maximum credible earthquake

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

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^-6 cm/sec (see section 20260)

Not required

Required if liner is required, blanket or dendritic

Required

<=1x10^-6 cm/sec, if required

100-year 24-hour precipitation

Withstand at least the maximum probable earthquake (see section 20370)

MSW Landfill⁽¹³⁾

Special⁽¹³⁾

Required

<=1x10^-6 cm/sec, if required

100-year 24-hour precipitation

Withstand at least the maximum probable earthquake (see section 20370)

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

All permeabilities specified in this table are maximum allowable permeabilities.

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

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 section 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.

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.

Single liner shall be a clay liner and removed or replaced as described in section 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.

[Reserved.]

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.

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.

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.

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

Table 4.1. Construction Standards for Units(1)

Table 4.1. Construction Standards for Units⁽¹⁾