Ala. Admin. Code r. 335-6-20-.19 - Storage Ponds

All new and existing ponds for municipal reclaimed water and reject water shall meet the following requirements:

(1) Reclaimed Water Ponds. Surface water features, such as storage ponds and landscape impoundments used for reclaimed water are not required to be lined but shall be designed to minimize discharge of pollutants to groundwater. Reclaimed water must meet required E. coli criteria before it is transported to such impoundments. Reclaimed ponds shall be designed with a minimum three feet of freeboard and sufficient storage capacity to assure retention of reclaimed water during adverse weather conditions less than ten year, twenty-four hour storm events. In designing the storage and capacity, periods of non-use shall be taken into consideration.

(2) Reject Water Ponds. An off-line system for storage of reject water shall be provided for all reuse facilities. At a minimum, the capacity of this storage shall be equal to three days of flow at the average daily design flow of the treatment system. Provisions for returning this reject water to the facility for further treatment or for sending the reject water to a separate disposal site shall be incorporated into the design. Ponds designed to receive reject water must be lined to prevent seepage from exceeding 1/8 inch per day. Either properly constructed clay or synthetic liners may be used. If a clay liner is used, provisions must be made to prevent drying, cracking and erosion. Reject water ponds may not be required if another discharge option is available. If the facility's alternate discharge option is through a NPDES Permit, the discharge must meet all of the requirements of the NPDES Permit.

Notes

Ala. Admin. Code r. 335-6-20-.19

Adopted by Alabama Administrative Monthly Volume XXXIII, Issue No. 11, August 31, 2015, eff. 9/29/2015.

Author: Nicholas Caraway

Statutory Authority: Code of Ala. 1975, §§ 22-22-1 to 22-22-14; §§ 22-22A-1 to 22-22A-16 et seq., as amended.