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 7 - Special Treatment, Storage, and Disposal Units
Subchapter 1 - Mining Waste Management
Article 1 - SWRCB-Mining Waste Management Regulations (C15: Article 7)
Table 1.3 - Natural and Artificial Containment Features for Mining Units
Universal Citation: 27 CA Code of Regs 1.3
Current through Register 2024 Notice Reg. No. 38, September 20, 2024
| Waste Group | Waste Management Unit | Geologic Setting | Liner(s) Hydr. Cond. Values (Units: cm/sec) | Leachate Collection and Removal System | ||
| A | Waste Pile | per § of Title 232531(b)(1) of Title 23, OR single clay liner1 <1x10-7 | required | |||
| Surface Impoundment or Tailings Pond | not applicable | double liner, both <1x10-7 outer: clay; Inner: clay or synthetic | required(2) | |||
| B | Waste Pile | per § 20250(b)(1) OR single clay liner | <1x10-6 (1) | required | ||
| Surface Impoundment or Tailings Pond | not applicable | double liner, both <1x10-6 // outer: clay or natural permeability(3); inner: clay or synthetic OR single replaceable clay liner(4) | required(2) | |||
| C | Waste Pile, Surface Impoundment, or Tailings Pond | not applicable | not applicable | not applicable | ||
| (1) Synthetic liner may be used for short-term containment [see § 22490(f)(1)]. | ||||||
| (2) Liner and leachate collection and removal system for tailings pond must be able to withstand the ultimate weight of wastes. | ||||||
| (3) Permeability of <1x10-6 cm/sec or natural geologic materials may replace outer liner of double liner system. | ||||||
| (4) Single clay liner <(1x10-6 cm/sec) for surface impoundment, to be removed before last 25 percent (minimum 1 foot thickness) of liner is penetrated by fluid, including waste and leachate. | ||||||
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