La. Admin. Code tit. 51 § XII-905

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

Section XII-905 - Coliform Repeat Compliance Monitoring [formerly Coliform Repeat Monitoring of Appendix C]

A. If a routine sample is total coliform positive and the public water supply has their own certified laboratory, repeat samples shall be collected by the public water supply within 24 hours of being notified of the positive result. If the State collects and analyzes the samples, repeat samples shall be collected by the state within 24 hours of official notification. At least three repeat compliance samples shall be collected for each routine total coliform positive sample found.

B. For each routine total coliform positive sample, at least one repeat sample shall be collected from the sampling tap where the original total coliform positive sample was taken and at least one repeat sample shall be collected at a tap within five service connections upstream and at least one repeat sample shall be collected at a tap within five service connections downstream of the original sampling site.

C. The repeat samples shall be collected on the same day.

D. In a system with a single service connection, three 100 ml repeat samples shall be collected.

E. If total coliforms are detected in any repeat sample, the system shall collect another set of repeat samples from the same locations within 24 hours of being notified of the positive result. The system shall continue to collect additional sets of repeat samples until either total coliforms are not detected in one complete set of repeat samples or the system determines that a coliform treatment technique trigger under this Part has been exceeded as a result of a repeat sample being total coliform-positive and the State is notified.

La. Admin. Code tit. 51, § XII-905

Promulgated by the Department of Health and Hospitals, Office of Public Health, LR 28:1334 (June 2002), Amended by the Department of Health, Office of Public Health, LR 4387 (1/1/2017).

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