Louisiana Administrative Code › Title 51 - PUBLIC HEALTH-SANITARY CODE › Part XIII - Sewage Disposal › Chapter 7 - Individual Sewerage Systems [formerly Chapter 13 Subpart D] › Subchapter B - Design and Construction Regulations [formerly Chapter 13 Appendix A] › Section XIII-733 - Effluent Reduction Options [formerly Section IX of Appendix A]

Current through Register Vol. 50, No. 6, June 20, 2024
A. [Formerly
				  paragraph A:9.8-1 of Appendix A] Effluent Reduction Field. This system is
				  installed downstream of a mechanical treatment plant or other sewage treatment
				  system listed in Chapter 7 Subchapter B of this Code that produces an effluent,
				  but does not by design significantly reduce that effluent. The effluent
				  reduction field is essentially a soil absorption field as described in
				  §719 of this Subchapter, but with
				  modification as noted in this Section. Section 1501. B 13 (Figure 15) has a
				  diagram with specifications and cross-sections of the effluent reduction field.
1. [Formerly paragraph A:9.8-2 of Appendix A]
				  If there is not sufficient grade to install the sewerage system and the
				  effluent reduction field with gravity flow to the discharge point, then a pump
				  station in compliance with applicable provision of this code must be
				  installed.
2. [Formerly paragraph
				  A:9.8-3 of Appendix A] The force of the pumped effluent must be reduced by use
				  of a distribution box, "Tee," or similar appurtenance.
3. [Formerly paragraph A:9.8-4 of Appendix A]
				  The effluent reduction field trenches shall be at least 18 inches wide and
				  between 16 to 24 inches in depth.
4. [Formerly paragraph A:9.8-5 of Appendix A]
				  The bottom of the effluent reduction field must be level.
5. [Formerly paragraph A:9.8-6 of Appendix A]
				  The fill or cover material shall be of porous soil or sand which allows the
				  passage of water in all directions, with sod started on top. Fill should be at
				  least 4 to 6 inches above grade and spread at least 3 to 4 feet on either side
				  of the trench.
6. [Formerly
				  paragraph A:9.8-7 of Appendix A] The effluent reduction field (ERF) must be
				  installed a minimum of 10 feet from any property line. In addition the ERF
				  field location shall comply with the minimum distance requirements from water
				  wells and suction lines, water pressure lines, etc., as contained in Parts XII
				  and XIV of this Code.
7. [Formerly
				  paragraph A:9.8-8 of Appendix A] The minimum length of the effluent reduction
				  field shall be determined by the treatment capacity of the sewerage system.
Treatment Capacity of Sewerage System
Minimum Total Length per Field
500 GPD or less
100 ft
501-750 GPD
150 ft
751-1000 GPD
200 ft
1001-1500 GPD
300 ft
8.
				  [Formerly paragraph A:9.8-9 of Appendix A] If more than one absorption trench
				  is used to provide the minimum required length of the effluent reduction field,
				  the distance between individual trenches must be at least 6 feet with one
				  discharge pipe provided.
9.
				  [Formerly paragraph A:9.8-10 of Appendix A] The pipe from the end of the
				  effluent reduction field to the discharge point must be solid.
10. [Formerly paragraph A:9.8-11 of Appendix
				  A] A backwater valve must be provided at the end of the effluent reduction
				  field whenever the discharge line is less than 12 inches above the ditch
				  flow-line.
11. [Formerly paragraph
				  A:9.8-12 of Appendix A] Each individual trench must not be greater than 100
				  feet in length. Clam or oyster shells may be substituted for gravel in the
				  effluent reduction field. If used, gravel must be clean, graded and 1/2-inch to
				  2 1/2 inches in diameter. Other media may be considered for use if determined
				  to have acceptable characteristics and properties. Although it may not be noted
				  in the attached figures (§1501. B 1-19), the end of the discharge line must
				  have a 1/2 diameter PVC end cap over the lower half of the endpipe, causing
				  longer retention of the effluent and providing greater opportunity for
				  absorption. If the end of the discharge line is more than 2 inches lower than
				  the absorption line, other provisions must be made to cause the effluent to be
				  retained in the reduction field.
12. [Formerly paragraph A:9.8-13 of Appendix
				  A] Gravelless pipe or other distribution chambers may be used in lieu of
				  conventional soil absorption pipe. If gravelless pipe is used, the fill must be
				  porous soil or sand which allows the passage of water in all directions, with a
				  6-inch layer below the pipe and filled 4 to 6 inches above grade and spread 3
				  to 4 feet on either side of the trench.