Section 2548 - Special Requirements for Surface Impoundments(a) Surface impoundments shall have sufficient freeboard to accommodate seasonal precipitation and precipitation conditions specified in Table 4.1 of this article but in no case less than 2 feet (measured vertically), and shall be designed and constructed to prevent overtopping as a result of wind conditions likely to accompany such precipitation conditions. A freeboard of less than 2 feet may be allowed at interior surface impoundments of a waste management facility where potential overflows would be to exterior surface impoundments, the operation implements a properly developed water balance plan, and the facility is provided with a fail-safe emergency retention area solely for the purpose of containing wastes due to surface impoundment failures.(b) An operation plan shall be submitted to the regional board which will provide operation levels and waste input quantities permitted each month based on anticipated precipitation and on past precipitation conditions for the year.(c) Direct pipeline discharge to surface impoundments shall be either equipped with devices or shall have fail-safe operating procedures to prevent overfilling. Discharges shall be stopped in the event of any containment system failure which causes a threat to water quality.(d) There shall be no discharge from a surface impoundment except as authorized by waste discharge requirements.(e) Surface impoundments shall be designed and constructed to prevent scouring of containment structures at points of discharge into the impoundments and by wave action at the waterline.(f) All visible portions of synthetic liners shall be inspected weekly until all free liquid is removed from the surface impoundment as part of closure. If, during the active life of the impoundment, the wastes are removed and the bottom of the impoundment cleaned down to the liner, an inspection shall be made of the bottom of the liner prior to refilling of the impoundment.Cal. Code Regs. Tit. 23, § 2548
1. Amendment of subsections (a) and (f) filed 6-18-97; operative 7-18-97 (Register 97, No. 25). Note: Authority cited: Section 1058, Water Code. Reference: Sections 13172 and 13360, Water Code.
1. Amendment of subsections (a) and (f) filed 6-18-97; operative 7-18-97 (Register 97, No. 25).