S.C. Code Regs. § 61-79.265.K.228

Current through Register Vol. 48, No. 5, May 24, 2024

Section 61-79.265.K.228 - Closure and postclosure care

(a) At closure, the owner or operator must: (amended 11/90)

(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 wastes unless Section261.3(d)(d) of this regulation applies; or

(2) Close the impoundment and provide postclosure care for a landfill under subpart G and section265.310, including the following:

(i) Eliminate free liquids by removing liquid wastes or solidifying the remaining wastes and waste residues;

(ii) Stabilize remaining wastes to a bearing capacity sufficient to support the final cover; and

(iii) 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.

(b) In addition to the requirements of Subpart G, and Section265.310, 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 paragraph (a)(2) of this selection 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 264.221(c)(2)(iv) and (3) of this chapter and 265.226(b) and comply with all other applicable leak detection system requirements of this part; (added 12/93; 5/96)

(3) Maintain and monitor the groundwater monitoring system and comply with all other applicable requirements of subpart F of this part; and

(4) Prevent runon and runoff from eroding or otherwise damaging the final cover.

S.C. Code Regs. 61-79.265.K.228

Amended by State Register Volume 12, Issue No. 10, eff October 28, 1988; State Register Volume 14, Issue No. 11, eff November 23, 1990; State Register Volume 16, Issue No. 12, eff December 25, 1992; State Register Volume 17, Issue No. 12, eff December 24, 1993; State Register Volume 20, Issue No. 5, eff May 24, 1996.