S.C. Code Regs. § § 61-79.264.F.94

Current through Register Vol. 48, 12, December 27, 2024

Section 61-79.264.F.94 - Concentration Limits

(a) The owner or operator shall specify in his permit application concentration limits in the groundwater for hazardous constituents established under Section264.93. The concentration of a hazardous constituent:

(1) Must not exceed the background level of that constituent in the groundwater at the time that limit is specified in the permit; or,

(2) For any of the constituents listed in Table 1 below, must not exceed the respective value given in that Table if the background level of the constituent is below the value given in Table 1 below; or,

(3) Must not exceed an alternate limit established by the Department under paragraph (b) of this section.

(b) The Department will consider establishing an alternate concentration limit for a hazardous constituent if the owner or operator can demonstrate to the Department that the constituent will not pose a substantial present or potential hazard to human health or the environment as long as the alternate concentration limit is not exceeded. In making such demonstration the owner or operator shall consider the following factors:

(1) Potential adverse effects on groundwater quality, considering:

264-94 Table 1--Maximum Concentration of Constituents for Groundwater Protection
Constituent	Maximum Concentration [FN1]
Arsenic	0.05
Barium	1.0
Cadmium	0.01
Chromium	0.05
Lead	0.05
Mercury	0.002
Selenium	0.01
Silver	0.05
Endrin (1,2,3,4,10,10-hexachloro-1,	0.0002
7-epoxy-1,4,4a,5,6,7,8,9a- octahydro-1, 4-endo, endo-5,8-dimethano naphthalene
Lindane (1,2,3,4,5,6-hexachlorocyclohexane, gamima isomer) Methoxychlor (1,1,1-Trichloro-2,2 bis p-methoxyphenylethane)	0.004
Toxaphene (C10-H10-Cl16, Technical chlorinated 0-005 camphene, 67-69 percent chlorine)
2, 4-D (2,4-Dichlorophenoxyacetic acid)	0.1
2,4,5-TP Silvex (2,4,5-Trichlorophenoxy- propionic acid)	0.01
[FN1] Milligrams per liter.

(i) The physical and chemical characteristics of the waste in the regulated unit, including its potential for migration;

(ii) The hydrogeological characteristics of the facility and surrounding land;

(iii) The quantity of groundwater and the direction of groundwater flow;

(iv) The proximity and withdrawal rates of groundwater users;

(v) The current and future uses of groundwater in the area;

(vi) The existing quality of groundwater, including other sources of contamination and their cumulative impact on the groundwater quality;

(vii) The potential for health risks caused by human exposure to waste constituents;

(viii) The potential damage to wildlife, crops, vegetation, and physical structures caused by exposure to waste constituents;

(ix) The persistence and permanence of the potential adverse effects; and,

(2) Potential adverse effects on hydraulically-connected surface-water quality, considering:

(i) The volume and physical and chemical characteristics of the waste in the regulated unit;

(ii) The hydrogeological characteristics of the facility and surrounding land;

(iii) The quantity and quality of groundwater, and the direction of groundwater flow;

(iv) The patterns of rainfall in the region;

(v) The proximity of the regulated unit to surface waters;

(vi) The current and future uses of surface waters in the area and any water quality standards established for those surface waters;

(vii) The existing quality of surface water, including other sources of contamination and the cumulative impact on surface-water quality;

(viii) The potential for health risks caused by human exposure to waste constituents;

(ix) The potential damage to wildlife, crops, vegetation, and physical structures caused by exposure to waste constituents; and,

(x) The persistence and permanence of the potential adverse effects.

(c) In making any determination under paragraph (b) of this section about the use of groundwater in the area around the facility the Department will consider any identification of underground sources of drinking water and exempted aquifers made under Section 48-1-50 of the Code of Laws.

S.C. Code Regs. § 61-79.264.F.94

Amended by State Register Volume 14, Issue No. 11, eff November 23, 1990; State Register Volume 16, Issue No. 12, eff December 25, 1992.