Waste Group | Waste Management Unit | Existing Units1 | New Units | |
A | Waste Pile Surface Impoundment Tailings Pond | Protect from 100-year peak streamflow | Outside 100-year floodplain | |
B | Waste Pile Surface Impoundment Tailings Pond | Protect from 100-year peak | streamflow | |
C | Waste Pile Surface Impoundment Tailings Pond | Retrofit as needed to protect surface water quality | Preclude increased sediment in surface water2 | |
1 As required by the RWQCB pursuant § 22470(a). | ||||
2 Mining wastes shall not be placed in perennial, intermittent, or ephemeral stream channels unless provision is made to divert runoff around the waste in a non-erosive manner. Wastes shall not be placed where they can be eroded by streamflows or where they can cause accelerated streambank erosion. Waste generated during seasonal mining operations may be exempted from these requirements provided that increased sediment in surface water is precluded. |
Cal. Code Regs. Tit. 27, div. 2, 1, ch. 7, subch. 1, art. 1, tbl. 1.2