Current through Register Vol. 50, No. 9, September 20, 2024
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.
AUTHORITY NOTE:
Promulgated in accordance with
R.S.
30:2180 et
seq.
