La. Admin. Code tit. 51 § XII-247

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

Section XII-247 - Separation Distances from Contamination Sources

A. Parallel installation. Water mains shall be laid at least 6 feet horizontally from any existing or proposed gravity sanitary or storm sewer, septic tank, or subsoil treatment system. This distance shall be measured edge to edge.

1. In cases where it is not practical to maintain a 6 foot separation, the state health officer may allow deviation on a case-by-case basis, if supported by data from the design engineer.

B. Crossings. Where water mains cross sewers, either above which is the preferred method, or below the sewer:

1. the water main shall be laid to provide a minimum vertical distance of 18 inches between the outside of the water main and the outside of the sewer.

2. there shall be one full length of water pipe so that both joints will be as far from the sewer as possible. Special structural support for the water and sewer pipes may be required by the state health officer.

C. Exception. When it is impossible to obtain the minimum specified separation distances, the state health officer shall specifically approve any variance from the requirements of §247. A and §247. B of this Subchapter and the following methods of installation may be used:

1. Installation of the water main closer to a sewer, provided that the water main is laid in a separate trench or on an undisturbed earth shelf located on one side of the sewer at such an elevation that the bottom of the water main is at least 18 inches above the top of the gravity sewer.

2. The sewer materials shall be water works grade 150 psi (1.0 Mpa) pressure rated pipe meeting AWWA standards or pipe approved by the state health officer and shall be pressure tested to ensure water tightness.

D. Force Mains. There shall be at least a 6 foot horizontal separation between water mains and sanitary sewer force mains. This measurement shall be from edge to edge. There shall be an 18 inch vertical separation at crossings as required in §247 of this Subchapter.

E. Sewer manholes. No water pipe shall pass through or come in contact with any part of a sanitary sewer manhole and shall be located at least 6 feet from sanitary sewer manholes.

La. Admin. Code tit. 51, § XII-247

Promulgated by the Department of Health, Office of Public Health, LR 44340 (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).