South Carolina Code of Regulations › Chapter 61 - DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL › Subchapter 61-107 - Solid Waste Management › Subchapter 61-107.19 - SOLID WASTE. MANAGEMENT: SOLID WASTE LANDFILLS AND STRUCTURAL FILL › Part V - CLASS THREE LANDFILLS. (SUBSections A THROUGH F OF THIS PART ARE CODIFIED TO COINCIDE WITH THOSE SUBPARTS IN 40CFR258.) › Subpart B - LOCATION RESTRICTIONS › Section 61-107.19.V.B.258.17 - Hydrogeologic Considerations

Current through Register Vol. 48, No. 6, June 28, 2024
a.
					 Class Three landfills shall be located in areas that can be demonstrated to
					 have the characteristics listed below (258.17.a. (1), a. (2), a. (3), and a.
					 (4)). The inability of a site to meet full compliance with these criteria may
					 not necessarily make the site unsuitable, but the applicant has the burden to
					 demonstrate to the satisfaction of the Department why variance from the
					 criteria will not compromise protection to human health and the environment. If
					 Department review finds the demonstration to be inadequate, the application may
					 be denied. Upon notification from the Department that the site meets the
					 requirements of this section, the applicant may submit a complete application
					 to the Department. This approval shall not be valid after a period of twelve
					 (12) months of the date of issuance if the complete application has not been
					 submitted, unless granted a variance by the Department.
(1) The site shall not be located in an area
					 where the hydrogeologic conditions allow the groundwater to migrate from
					 shallow geologic units that have little potential as an underground source of
					 drinking water, into deeper units. At the disposal area, any release to the
					 uppermost aquifer would remain in the uppermost aquifer until discharge into
					 the perennial stream nearest to the disposal area. The potentiometric head in
					 the shallow portion of the uppermost aquifer shall be equal to or lower than
					 the potentiometric head in the deeper portion of the uppermost aquifer (i.e., a
					 lateral or an upward hydraulic gradient shall exist).
(2) The estimated deflected (or settled)
					 bottom elevation of the landfill base grade shall be a minimum of three 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.
(3) A minimum 10 foot
					 vertical separation of naturally occurring or engineered material shall be
					 maintained between the base of the constructed liner and bedrock; provided,
					 however, the nature of the material and sufficient separation exists to provide
					 for installation and operation of an effective groundwater monitoring system.
					 The nature of the material comprising this interval is subject to Department
					 approval.
(4) The landfill shall
					 not be located over an area where a stratum of limestone exhibiting secondary
					 permeability with an average thickness of greater than five feet lies within 50
					 feet of the base of the landfill.