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. |
Cal. Code Regs. Tit. 27, div. 2, 1, ch. 7, subch. 1, art. 1, tbl. 1.3