California Code of Regulations › Title 27 - Environmental Protection › Division 2 - Solid Waste › 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 3 - Waste Management Unit, Facility, or Disposal Site Classification and Siting › Section 20250 - SWRCB-Class II: Waste Management Units for Designated Waste. (C15: Section 2532)

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a)
						General--Class II waste management units (Class II Units) shall be located
						where site characteristics and containment structures isolate waste from waters
						of the state. The classification criteria in this section shall be used for
						reclassification of existing Units at disposal sites approved as Class II-1
						under previous versions of these SWRCB regulations, and for existing Units used
						for treatment or for storage, whether or not classified, provided that no
						hazardous wastes other than those which DTSC has determined need not be
						discharged as a hazardous waste) have been discharged at such Units (including
						discharge at any expansion of such Units).
(b) Geologic Setting.
(1) New and existing Class II landfills or
						waste piles shall be immediately underlain by natural geologic materials which
						have a hydraulic conductivity of not more than
						1x10-6 cm/sec (i.e., 1 foot/year) and which are of
						sufficient thickness to prevent vertical movement of fluid, including waste and
						leachate, from Units to waters of the state for as long as wastes in such units
						pose a threat to water quality. Class II units shall not be located where areas
						of primary (porous) or secondary (rock opening) hydraulic conductivity greater
						than 1x10-6 cm/sec (i.e., 1 foot/year) could impair
						the competence of natural geologic materials to act as a barrier to vertical
						fluid movement.
(2) Natural or
						artificial barriers shall be used to prevent lateral movement of fluid,
						including waste and leachate.
(3) A
						liner system which conforms to the requirements of Article 4 of this subchapter
						with a hydraulic conductivity of not more than
						1x10-6 cm/sec (i.e., 1 foot/year) shall be used for
						landfills and waste piles when natural geologic materials do not satisfy the
						requirements in ¶(b)(1).
(4)
						Class II surface impoundments are not required to comply with the requirements
						of ¶(b)(1), but shall have a liner system designed in accordance with the
						applicable SWRCB- promulgated provisions of Article 4 of this subchapter
						(§
													20310 et seq.). The RWQCB can
						allow Class II surface impoundments which are designed and constructed with a
						double liner system in accordance with that article to use natural geologic
						materials which comply with ¶(b)(1) for the outer liner.
(5) Land treatment units (LTUs) are not
						required to comply with the requirements of ¶(b). Dischargers who treat or
						dispose of wastes in LTUs shall demonstrate, prior to application of the waste,
						that waste can be completely degraded, transformed, or immobilized in the
						treatment zone. To demonstrate this, prior to the application of waste, the
						discharger shall operate a test plot for a sufficient period to give the RWQCB
						a reasonable indication that degradation, transformation, or immobilization
						will take place in the treatment zone. During the full-scale operation of the
						LTU, soil and soil-pore liquid samples shall be taken within the treatment zone
						to verify that complete degradation, transformation, or immobilization is
						taking place. The RWQCB shall specify in WDRs the elements of the land
						treatment program including the dimensions of the treatment zone. The maximum
						depth of the treatment zone shall not exceed 5 feet from the initial soil
						surface.