9VAC25-280-70. Ground water criteria

CONSTITUENT (mg/l) GROUND WATER CRITERIA BY PHYSIOGRAPHIC PROVINCE*** CONSTITUENT (mg/l) GROUND WATER CRITERIA BY PHYSIOGRAPHIC PROVINCE*** Coastal Plain Piedmont & Blue Ridge Valley & Ridge Cumberland Plateau Coastal Plain Piedmont & Blue Ridge Valley & Ridge Cumberland Plateau Alkalinity 30-500 10-200 30-500 30‑200 Alkalinity 30-500 10-200 30-500 30‑200 Total Diss. Solids 1000 250 500 500 Total Diss. Solids 1000 250 500 500 Chloride 50* 25 25 25 Chloride 50* 25 25 25 Sulfate 50 25 100 150 Sulfate 50 25 100 150 Total Organic Carbon 10 10 10 10 Total Organic Carbon 10 10 10 10 Color units 15 15 15 15 Color units 15 15 15 15 Iron 0.3 0.3 0.3 0.01-10 Iron 0.3 0.3 0.3 0.01-10 Manganese 0.05 0.05 0.05 0.01-0.5 Manganese 0.05 0.05 0.05 0.01-0.5 Sodium 100* 25 25 100 Sodium 100* 25 25 100 Fluoride 1.4** 1.4 1.4 1.4 Fluoride 1.4** 1.4 1.4 1.4 Hardness 120 120 300 180 Hardness 120 120 300 180 *It is recognized that naturally occurring concentrations will exceed this limit in the eastern part of the Coastal Plain, especially toward the shoreline and with increased depth. **Except within the cretaceous aquifer: concentration up to 5 mg/l and higher. ***See Figure 1 for delineation of physiographic provinces. Figure 1