La. Admin. Code tit. 51 § XII-1311

Current through Register Vol. 50, No. 9, September 20, 2024

Section XII-1311 - Alternative Compliance Criteria

A. When a public water system, meeting §1303. A applicability requirements, uses an alternative compliance criteria (ACC) on its monthly TOC monitoring report, the following numbering key shall be employed to identify the specific alternative compliance criteria used.

1.ACC #1-source water TOC level is less than 2.0 mg/L.

2.ACC #2-treated water TOC level is less than 2.0 mg/L.

3.ACC #3-source water TOC is less than 4.0 mg/L and source water alkalinity is greater than 60mg/L (as CaCO₃) and either:

a. the TTHM and HAA5 running annual averages are no greater than 0.040 mg/L and 0.030 mg/L, respectively; or

b. prior to the effective date for compliance, the system has made a clear and irrevocable financial commitment not later than the effective date for compliance to use technologies that will limit the levels of TTHMs and HAA5s to no more than 0.040 mg/L and 0.030 mg/L, respectively.

4.ACC #4-the TTHM and HAA5 running annual averages are no greater than 0.040 mg/L, respectively, and the system uses only chlorine for primary disinfection and maintenance of a residual in the distribution system.

5.ACC #5-source water specific ultraviolet absorbance (SUVA) prior to any treatment is less than or equal to 2.0 L/mg-m.

6.ACC #6-finished water SUVA is less than or equal to 2.0 L/mg-m.

7.ACC #7-for systems practicing enhanced softening that cannot achieve the Step 1 TOC removal requirements and softening results in lowering the treated water alkalinity to less than 60 mg/L (as CaCO₃).

8.ACC #8-for systems practicing enhanced softening that cannot achieve the Step 1 TOC removal requirements and softening results in removing at least 10 mg/L of magnesium hardness (as CaCO₃).

B. When ACC #6 is utilized, the water samples for dissolved organic carbon (DOC) and ultraviolet absorption at a wavelength of 254 nanometers (UV₂₅₄) shall be collected at a point in the treatment plant after coagulation, flocculation, and sedimentation have occurred as well as at a point prior to the addition of any oxidant or disinfectant to the water. Such samples shall also be collected no later than the point at which samples for combined filter effluent turbidity are collected. If the plant is designed such that these monitoring parameters can not be met, or if ferric salts are used for coagulation in the clarification process, then a source water sample, prior to any treatment, shall be collected for the performance of a "treated-water SUVA jar test." Such "treated-water SUVA jar test" shall simulate actual plant conditions relative to coagulation, flocculation, and sedimentation. No oxidant, disinfectant, or ferric salts shall be employed in this jar test. Plants using ferric salts must replace the ferric with an equivalent amount of alum in the "treated-water SUVA jar test." After coagulation, flocculation, and sedimentation have been simulated in the jar test, samples of the supernatant shall be collected for DOC and UV₂₅₄ determination. The results of such samples are to be used as the basis for calculating the finished water SUVA value under ACC #6.

La. Admin. Code tit. 51, § XII-1311

Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 30:1198 (June 2004).

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