La. Admin. Code tit. 51 § XII-227

Current through Register Vol. 50, No. 11, November 20, 2024

Section XII-227 - Treatment Plant Storage

A. The applicable design standards of §225 shall be followed for plant storage.

B. Filter Washwater Tanks. Filter washwater tanks shall be sized, in conjunction with available pump units and finished water storage, to provide the backwash water required by §177. A 10 of this Part. Consideration shall be given to the backwashing of several filters in rapid succession.

C. Clearwell. Clearwell storage should be sized, in conjunction with distribution system storage, to relieve the filters from having to follow fluctuations in water use.

1. When finished water storage is used to provide disinfectant contact time (see §179. C) special attention shall be given to tank size and baffling (see §227. C 2)

2. To ensure adequate disinfectant contact time, sizing of the clearwell should include extra volume to accommodate depletion of storage during the nighttime for intermittently operated filtration plants with automatic high service pumping from the clearwell during non-treatment hours.

3. An overflow and vent shall be provided.

a. A minimum of two clearwell compartments shall be provided.

D. Finished or treated water must not be stored or conveyed in a compartment adjacent to untreated or partially treated water when the two compartments are separated by a single wall, unless approved by the state health officer.

E. Unless otherwise allowed by the state health officer, other treatment plant storage tanks/basins such as detention basins, backwash reclaim tanks, receiving basins and pump wet-wells for finished water shall be designed as finished water storage structures.

La. Admin. Code tit. 51, § XII-227

Promulgated by the Department of Health, Office of Public Health, LR 44337 (2/1/2018), effective 8/1/2018.

AUTHORITY NOTE: Promulgated in accordance with the provisions of R.S. 40:4.A.(8), 40:4.13.D.(1)(2) and 40:5.A.(2)(3)(5)(6)(7)(17).