La. Admin. Code tit. 51 § XII-1131

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

Section XII-1131 - Operating Criteria

A. All treatment plants utilizing surface water or GWUDISW shall be operated by certified operators in accord with LAC 48:V.Chapter 73.

B. Filtration facilities shall be operated in accordance with the following requirements.

1. Conventional and direct filtration treatment plants shall be operated at flow rates not to exceed 3 gallons per minute per square foot (gpm/sq ft) for gravity filters. In any instance when pressure filters have been approved by DHH as the primary turbidity removal mechanism (see §323 of this Part), filtration rates shall not exceed 2 gpm/sq ft.

2. Slow sand filters shall be operated at filtration rates not to exceed 0.10 gallons per minute per square foot. The filter bed shall not be dewatered except for cleaning and maintenance purposes.

3. Diatomaceous earth filters shall be operated at filtration rates not to exceed 1.0 gallon per minute per square foot.

4. In order to obtain approval for higher filtration rates than those specified in this Section, the supplier shall demonstrate to DHH that the filters can achieve an equal degree of performance.

5. Filtration rates shall be increased gradually when placing filters back into service following backwashing or any other interruption in the operation of the filter.

6. In any instance when pressure filters have been approved by DHH as the primary turbidity removal mechanism (see §323 of this Part), such filters shall be physically inspected and evaluated annually (not sooner than 120 calendar days from any previous inspection/evaluation) for such factors as media condition, mudball formation, and short circuiting. A written record of the inspection shall be maintained at the treatment plant.

C. Disinfection facilities shall be operated in accordance with the following requirements.

1. A supply of chemicals necessary to provide continuous operation of disinfection facilities shall be maintained as a reserve or demonstrated to be available under all conditions and circumstances.

2. An emergency plan shall be developed prior to and implemented in the event of disinfection failure to prevent delivery to the distribution system of any undisinfected or inadequately disinfected water. The plan shall be posted in the treatment plant or other place readily accessible to the plant operator.

3. System redundancy and changeover systems shall be maintained and kept operational at all times to ensure no interruption in disinfection.

La. Admin. Code tit. 51, § XII-1131

Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 28:2525 (December 2002).

AUTHORITY NOTE: Promulgated in accordance with R.S. 40: 4 (A)(8), R.S. 40: 5 (2)(3)(5)(6)(17)(20) and R.S. 40:1148.