La. Admin. Code tit. 33 § V-4501

Current through Register Vol. 50, No. 6, June 20, 2024

Section V-4501 - Closure and Post-Closure

A. At final closure of the landfill or upon closure of any cell, the owner or operator must place a final cover over the landfill or cell, and the closure plan under LAC 33:V.4381 must specify the function and design of the cover. In the post-closure plan under LAC 33:V.4391, the owner or operator must include the post-closure care requirements of LAC 33:V.4501.D.

B. In the closure and post-closure plans, the owner or operator must address the following objectives and indicate how they will be achieved:

1. control pollutant migration from the facility via groundwater, surface water, and air;

2. control surface water infiltration, including prevention of pooling;

3. provide long-term minimization of migration of liquids through the closed landfill;

4. function with minimum maintenance;

5. promote drainage and minimize erosion or abrasion of the cover;

6. accommodate settling and subsidence so that the cover's integrity is maintained; and

7. have a permeability less than or equal to the permeability of any bottom liner system or natural subsoils present.

C. The owner or operator must consider at least the following factors in addressing the closure and post-closure care objectives of LAC 33:V.4501.B:

1. type and amount of hazardous waste and hazardous waste constituents in the landfill;

2. the mobility and the expected rate of migration of the hazardous waste and hazardous waste constituents;

3. site location, topography, and surrounding land use, with respect to the potential effects of pollutant migration (e.g., proximity to groundwater, surface water, and drinking water sources);

4. climate, including amount, frequency, and pH of precipitation;

5. characteristics of the cover including material, final surface contours, thickness, porosity and permeability, slope, length of run of slope, and type of vegetation on the cover; and

6. geological and soil profiles and surface and subsurface hydrology of the site.

D. In addition to the requirements of LAC 33:V.4389, during the post-closure care period, the owner or operator of a hazardous waste landfill shall:

1. maintain the integrity and effectiveness of the final cover, including making repairs to the cover as necessary to correct the effects of settling, subsidence, erosion, or other events;

2. maintain and monitor the leachate collection, removal, and treatment system (if there is one present in the landfill) to prevent excess accumulation of leachate in the system. If the collected leachate is a hazardous waste under LAC 33:V.Chapter 49, it must be managed as a hazardous waste in accordance with all applicable requirements of LAC 33:V.Chapters 10, 11, 13 and 43. If the collected leachate is discharged through a point source to waters of the United States, it is subject to the requirements of Section 402 of the Clean Water Act, as amended;

3. maintain and monitor the leak detection system in accordance with LAC 33:V.2503.L.4.d, L.5, and 4502.B and comply with all other applicable leak detection system requirements of LAC 33:VChapter 43:1149 (June 2017).

4. maintain and monitor the groundwater monitoring system and comply with all other applicable requirements of LAC 33:V.4367;

5. prevent run-on and run-off from eroding or otherwise damaging the final cover;

6. maintain and monitor the gas collection and control system (if there is one present in the landfill) to control the vertical and horizontal escape of gases;

7. protect and maintain surveyed benchmarks used in complying with LAC 33:V.2509 subject to authority of LAC 33:V.4499; and

8. restrict access to the landfill as appropriate for its post-closure use.

La. Admin. Code tit. 33, § V-4501

Promulgated by the Department of Environmental Quality, Office of Solid and Hazardous Waste, Hazardous Waste Division, LR 10:200 (March 1984), amended LR 21:266 (March 1995), amended by the Office of the Secretary, Legal Affairs Division, LR 33:1627 (August 2007), Amended by the Office of the Secretary, Legal Division, LR 431149 (6/1/2017), Amended by the Office of the Secretary, Legal Affairs and Criminal Investigations Division, LR 46948 (7/1/2020).

AUTHORITY NOTE: Promulgated in accordance with R.S. 30:2180 et seq.