LAC 33:V.3309. Concentration Limits

A. The administrative authority will specify in the facility permit concentration limits in the groundwater for hazardous constituents established under LAC 33:V.3307. 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 of this Section, must not exceed the respective value given in that table if the background level of the constituent is below the value given; or 3. must not exceed an alternative limit established by the administrative authority under Subsection B of this Section. Table 1. Maximum Concentration of Constituents for Groundwater Protection Constituent | Maximum Concentration1 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-1,4,4a,5,6, 7,8,9a-octahydro-1, 4-endo-5, 8-demethano napthalene) | 0.0002 Lindane (1,2,3,4,5,6-hexachlorocyclohexane, gamma isomer) | 0.004 Methoxychlor (1,1,1-Trichloro-2, 2-bis) (p-methoxyphenylethane) | 0.1 Toxaphene (C10H10Cl6, Technical chlorinated camphene, 67-69 percent chlorine) | 0.005 2,4-D (2,4-Dichlorophenoxyacetic acid) | 0.1 2,4,5-TP Silvex (2,4,5-Trichlorophenoxypropionic acid) | 0.01 1 Milligrams per liter B. The administrative authority may 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. The establishment of such alternative concentration limits shall be in accordance with LAC 33:I.Chapter 13. In establishing alternate concentration limits, the administrative authority will consider the following factors: 1. potential adverse effects on groundwater quality, considering: a. the physical and chemical characteristics of the waste in the regulated unit, including its potential for migration; b. the hydrogeological characteristics of the facility and surrounding land; c. the quantity of groundwater and the direction of groundwater flow; d. the proximity and withdrawal rates of groundwater users; e. the current and future uses of groundwater in the area; f. the existing quality of groundwater, including other sources of contamination and their cumulative impact on the groundwater quality; g. the potential for health risks caused by human exposure to waste constituents; h. the potential damage to wildlife, crops, vegetation, and physical structures caused by exposure to waste constituents; i. the persistence and permanence of the potential adverse effects; and 2. potential adverse effects on hydraulically-connected surface water quality, considering: a. the volume and physical and chemical characteristics of the waste in the regulated unit; b. the hydrogeological characteristics of the facility and surrounding land; c. the quantity and quality of groundwater and the direction of groundwater flow; d. the patterns of rainfall in the region; e. the proximity of the regulated unit to surface waters; f. the current and future uses of surface waters in the area and any water quality standards established for those surface waters; g. the existing quality of surface water, including other sources of contamination and the cumulative impact on surface water quality; h. the potential for health risks caused by human exposure to waste constituents; i. the potential damage to wildlife, crops, vegetation, and physical structures caused by exposure to waste constituents; and j. the persistence and permanence of the potential adverse effects. C. In making any determination under Subsection B of this Section about the use of groundwater in the area around the facility, the administrative authority will consider any identification of underground sources of drinking water and exempted aquifers identified in the permit application under LAC 33:V.Chapter 3. Any identification of underground sources of drinking water shall be in accordance with LAC 33:I.Chapter 13.