Chapter 7. Special Treatment, Storage, and Disposal Units
Table 1.2 Floodplain Siting Criteria
|Waste Group||Waste Management Unit||Existing Units1||New Units|
|A||Waste Pile Surface Impoundment Tailings Pond||Protect from 100-year peak stream flow||Outside 100-year floodplain|
|B||Waste Pile Surface Impoundment Tailings Pond||Protect from 100-year peak stream flow||Stream flow|
|C||Waste Pile Surface Impoundment Tailings Pond||Retrofit as needed to protect surface water quality||Preclude increased sediment in surface water2|
- As required by the RWQCB pursuant section 22470(a).
- 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 stream flows or where they can cause accelerated stream bank erosion. Waste generated during seasonal mining operations may be exempted from these requirements provided that increased sediment in surface water is precluded.