La. Admin. Code tit. 33 § V-4457

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

Section V-4457 - Closure and Post-Closure

A. At closure, the owner or operator must:

1. remove or decontaminate all waste residues, contaminated containment system components (liners, etc.), contaminated subsoils, and structures and equipment contaminated with waste and leachate, and manage them as hazardous waste unless LAC 33:V.4905.A.4 applies; or

2. if some waste residues or contaminated materials are left in place at final closure, the owner or operator must either:

a. perform a risk assessment to demonstrate that closure with the remaining contaminant levels is protective of human health and the environment in accordance with LAC 33:I.Chapter 13. Any such risk assessment is subject to approval by the administrative authority and must demonstrate that post-closure care is not necessary to adequately protect human health and the environment; or

b. close the impoundment and provide post-closure care in accordance with Subsection B of this Section.

B. If the owner or operator elects to comply with Subparagraph A.2.b of this Section, he must close the impoundment and provide post-closure care for a landfill under LAC 33:V.4501, including the following:

1. eliminate free liquids by removing liquid wastes or solidifying the remaining wastes and waste residues;

2. stabilize remaining wastes to a bearing capacity sufficient to support the final cover; and

3. cover the surface impoundment with a final cover designed and constructed to:

a. provide long-term minimization of the migration of liquids through the closed impoundment;

b. function with minimum maintenance;

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

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

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

C. In addition to the requirements of LAC 33:V.4501, during the post-closure care period, the owner or operator of a surface impoundment in which wastes, waste residues, or contaminated materials remain after closure in accordance with the provisions of Subparagraph A.2.b of this Section must:

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 leak detection system in accordance with LAC 33:V.2903.J.3.d and 4 and 4455.B and comply with all other applicable leak detection system requirements of this Chapter;

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

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

La. Admin. Code tit. 33, § V-4457

Promulgated by the Department of Environmental Quality, Office of Solid and Hazardous Waste, Hazardous Waste Division, LR 10:200 (March 1984), amended LR 15:470 (June 1989), LR 18:723 (July 1992), LR 21:266 (March 1995), amended by the Office of the Secretary, LR 24:2249 (December 1998), amended by the Office of the Secretary, Legal Affairs Division, LR 34:634 (April 2008).

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