R315-264-94. Concentration Limits

  (a) The Director shall specify in the facility permit concentration limits in the ground water for hazardous constituents established under Section R315-264-93. The concentration of a hazardous constituent:

  (1) Shall not exceed the background level of that constituent in the ground water at the time that limit is specified in the permit; or

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

Table 1

Maximum Concentration of Constituents for Ground-water

Protection

                Constituent Maximum

                                             concentration(1)

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-1,7-epoxy 0.0002

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, 0.004

gamma isomer)

Methoxychlor (1,1,1-Trichloro-2,2-bis (p- 0.1

methoxyphenylethane)

Toxaphene (C10H10Cl6, Technical chlorinated 0.005

camphene, 67-69 percent chlorine)

2,4-D (2,4-Dichlorophenoxyacetic acid) 0.1

2,4,5-TP Silvex 0.01

(2,4,5-Trichlorophenoxypropionic acid)

(1) Milligrams per liter.

  (3) Shall not exceed an alternate limit established by the Director under Subsection R315-264-94(b).

  (b) The Director shall establish an alternate concentration limit for a hazardous constituent if he finds 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 establishing alternate concentration limits, the Director shall consider the following factors:

  (1) Potential adverse effects on ground-water quality, considering:

  (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 ground water and the direction of ground-water flow;

  (iv) The proximity and withdrawal rates of ground-water users;

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

  (vi) The existing quality of ground water, including other sources of contamination and their cumulative impact on the ground-water 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 ground water, and the direction of ground-water 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 Subsection R315-264-94(b) about the use of ground water in the area around the facility the Director shall consider any identification of underground sources of drinking water and exempted aquifers made under 40 CFR 144.7.