S.C. Code Regs. § 61-107.19.IV.D

Current through Register Vol. 48, No. 10, October 25, 2024

Section 61-107.19.IV.D - Design Criteria for Class Two Landfills

1. The estimated deflected (or settled) bottom elevation of the landfill base grade shall be a minimum of two feet above the seasonal high water table elevation as it exists prior to the construction of the disposal area. The seasonal high water table shall be determined by interpretation of a minimum of 12 months data obtained from a representative number of monitoring wells approved by the Department. In cases where there is insufficient information to support the seasonal high water table elevation determination, additional separation may be required by the Department. The Department will inspect the landfill prior to the initial placement of waste in the landfill.

2. Drainage control requirements.

a. The disposal area shall be graded with a minimum of a 1% slope so as to divert and minimize run-off into the disposal area of the landfill, to prevent erosion and ponding within the disposal area, and to drain water from the surface of the landfill.

b. Prior to accepting waste, the owners/operators shall design, construct, and subsequently maintain:

(1) A run-on control system to prevent flow onto the active portion of the landfill during peak discharge from a 24-hour, 25-year storm; and,

(2) A run-off control system from the active portion of the landfill to collect and control at least the water volume resulting from a 24-hour, 25-year storm.

c. An appropriate permit from the Department may be required prior to the discharge of any storm waters to surface waters.

S.C. Code Regs. 61-107.19.IV.D